CITY POWER JOHANNESBURG (SOC) LTD ADVERTISEMENT WITH SPEC.pdf · CONTACT PERSON: Masego Moiloa RFQ DOCUMENTS WILL BE AVAILABLE ON SITE AND ON THE WEBSITE AS FROM 03 DECEMBER 2019

City Power Johannesburg

40 Heronmere Road Reuven Johannesburg

PO Box 38766 Booysens 2016

www.citypower.co.za

Tel +27(0) 11 490 7000 Fax +27(0) 11 490 7590

Non-Executive Directors: L Nage (Chairperson of the Board), H Chewane, D Gibson, D Hunt, S Kganakga, B Mathebula, T Mofokeng, M Seopela, L Tjia, Executive Directors: L Setshedi (Chief Executive Officer), N Xolo (Chief Financial Officer) M Smith (Company Secretary) Registration number: 2000/030051/30 VAT number: 4710191182

CITY POWER JOHANNESBURG

Bidders are hereby invited for the following RFQ, further details are available from CITY POWER,

Tender Advice Centre, 40 Heronmere Rd, Reuven, Booysens Telephone 011 490-7000, Fax 011 490-7765/011 870-3688

CITY POWER JOHANNESBURG (SOC) LTD

ADVERTISEMENT

REQUEST FOR QUOTATION: SUPPLY AND DELIVERY OF INSULATING OIL REQUEST FOR QUOTATION: RFQ CLOSING DATE: 10 December 2019 RFQ CLOSING TIME: 11h00 VENUE: City Power – Tender Advice Centre CONTACT PERSON: Masego Moiloa

RFQ DOCUMENTS WILL BE AVAILABLE ON SITE AND ON THE WEBSITE

AS FROM 03 DECEMBER 2019

40 HERONMERE ROAD REUVEN, BOOYSENS

SUBMISSIONS: QUOTATION BOX, TENDER ADVICE CENTRE

Please note:- That we also advertise on our Website:

Website Address: www.citypower.co.za Available Bid’s and RFQ’S

http://www.citypower.co.za/

Contact Person: Masego Moiloa Tel: (011) 490-7209 Fax: (011) 870-3409 Email:[email protected] Company: ....................................................

Attention: ...................................................

Tel: ..........................................................

Fax: .........................................................

Email: .......................................................

You are hereby invited to submit a quotation for the items listed below. Please provide a written

quotation to the above named contact person on or before the closing date indicated below. Only

quotations which contain the information listed below will be accepted. Prices should be shown

inclusive of VAT and fixed and firm. Delivery will be direct to the relevant City Power store.

Material/Service Description Estimated Quantities

(Quantity may change

at the time of placing

an order)

Price Each Total Excl. VAT

551

Insulating Oil:Electrical; Type/Model Designation:

Regenerated Non-Exchange; Unit Package Type:

Drum; Unit Package Quantity: 210l; End Item

Identification: For Transformers and Switchgear;

Specification/standard Data: CP_TSSPEC_116

NB: COMPLETE ATTACHED SPECIFICATION CP_TSSPEC_116 Note: Ticks, Cross [√, X], Asterisk [*], Word [Noted or

Comply] or TBA [“To Be Advice”] will not be accepted. 50

vat @15%

TOTAL Incl. VAT

Closing date and time for submission of quotation: 03/12/2019 @ 11h00

NB:

Specification must be fully COMPLETED, 100% COMPLIANT and ATTACHED to the submission: Failure will result in quote reviewed as NON-RESPONSIVE and will not be evaluated any further.

Specification: CP_TSSPEC_116 Stock Item No. 551

Fully Compliant to Specification Fully Completed and signed

Should you need assistance or clarification with the completion of Specification document, please do not hesitate to call or send an email through.

EVALUATION CRITERIA MINIMUM THRESHOLD OF 80% ON TECHNICAL MUST BE ACHIEVED FAILING WHICH, THE BID WILL NOT BE EVALUATED FURTHER

Evaluation Criteria

Scoring Weighting

FIRST STAGE EVALUATION - 80% THRESHOLD MUST BE ACHIEVED

100

1.

Fully compliant, completed and signed technical schedule CP_TSSPEC_116

Fully compliant, completed and signed technical schedule = 10 POINTS Partially completed =0 POINT

40

2. Provide a SANS 555 certificate

3. Provide a fully complete type test report (as per specification CP_TSSPEC_116)

Fully complete type test report= 10 POINTS Partial type test report = 0 POINT

50

4. Provide a valid ISO 9001 and ISO 14001 certificates from the manufacturer

Both ISO 9001 & 14001 certificates = 10 POINTS No ISO certificate = 0 POINT

10

TOTAL

100

SECOND STAGE EVALUATION

1. Price

80

2. BBBEE Level

20

Vendors must supply written quotations that reflect the following information on the quotation:

Quotation Validity Period:______________________

Delivery period___________________________________________

Company Name:_____________________________________

Company Registration Number:_______________________________

VAT Registration Number________________

Physical Address:_______________________________

Contact Person:_ _________________________

Telephone Number:_ ___________________

Fax Number/Email Address:_____________________

Company Income Tax Number (i.e. SARS No):________________________

Original Tax Clearance Certificate Attached or consent for City Power to ascertain from

SARS whether your status is in order:

Signed disclaimer (Attached to this RFQ):_________________________

PREFERENCE POINT SYSTEM WILL BE USED FOR VALUE BETWEEN R30K AND R200K

Evaluation is based on Price only

Points awarded for Price and RDP goals (80/20)

PRICE 80

B-BBEE Status Level of

Contributor

Number of points

(80/20 system)

1 20

2 18

3 14

4 12

5 8

6 6

7 4

8 2

Non-complaint

Contributor 0

CALCULATION

1. THE 80/20 PREFERENCE POINT SYSTEMS

A maximum of 80 points is allocated for price on the following basis:

min

min180

P

PPtPs

Where

Ps = Points scored for price of bid under consideration

Pt = Rand value of bid under consideration

Pmin = Rand value of lowest acceptable bid

2. Points awarded for historically disadvantaged individuals

A maximum of 20 points is allocated for price on the following basis:

100

EPNOPNEP

Where

NEP = Points awarded for equity ownership by an HDI, and values for 10, 5 and 5 will be

calculated

NOP = The maximum number of points awarded for equity ownership by an HDI in that

specific category

EP = The percentage of equity ownership by an HDI within the enterprise or business,

determined in accordance with the definition of HDI’s.

Disclaimer: Supplier ( ) hereby warrants that he/she/it

has:

(Name of supplier)

1. Read, fully understood and hereby accept City Power’s standard quotation Terms &

Conditions as published on the official City Power website;

2. Submitted a true and accurate declaration of interests reflecting that the supplier

has no immediate family relations and that none of its shareholders, directors,

managers or stakeholders are in the employ of City Power or the state currently and

that no such relatives, shareholders, directors, managers or stakeholders have been

so employed in the previous 12 months;

3. Undertakes to complete a fresh declaration of interests should these circumstances

have changed as at date of this quotation. (This declaration is obtainable from the

City Power’s website/ Commodity Managers and the abovementioned contact person).

PLEASE SUPPLY THE FOLLOWING DOCUMENTS TO ENABLE US TO

EVALUATE YOUR SUBMISSION:

1. VALID TAX CLEARANCE CERTIFICATE

2. SARS PIN

3. SIGNED DECLARATION OF INTEREST FORM (MBD4) AND

(MBD9)

4. CSD SUPPLIER NUMBER AND SUPPLIER UNIQUE NUMBER

Name, Date & Signature

of Supplier

(Person responsible for

the Quote)

Name:

Signature:

Date

MBD 4

DECLARATION OF INTEREST

1. No bid will be accepted from persons in the service of the state. 2. Any person, having a kinship with persons in the service of the state, including a blood relationship, may make

an offer or offers in terms of this invitation to bid. In view of possible allegations of favouritism, should the resulting bid, or part thereof, be awarded to persons connected with or related to persons in service of the state, it is required that the bidder or their authorised representative declare their position in relation to the evaluating/adjudicating authority and/or take an oath declaring his/her interest.

3 In order to give effect to the above, the following questionnaire must be completed and submitted with the bid.

3.1 Full Name: ………………………………………………………………………… 3.2 Identity Number: ………………………………………………………………… 3.3 Company Registration Number: ………………………………………………… 3.4 Tax Reference Number: ………………………………………………………… 3.5 VAT Registration Number: ………………………………………………………

3.6 Are you presently in the service of the state YES / NO

3.6.1 If so, furnish particulars. ………………………………………………………………

MSCM Regulations: “in the service of the state” means to be – (a) a member of –

(i) any municipal council; (ii) any provincial legislature; or (iii) the national Assembly or the national Council of provinces;

(b) a member of the board of directors of any municipal entity; (c) an official of any municipality or municipal entity; (d) an employee of any national or provincial department, national or provincial public entity or constitutional institution within the

meaning of the Public Finance Management Act, 1999 (Act No.1 of 1999); (e) a member of the accounting authority of any national or provincial public entity; or (f) an employee of Parliament or a provincial legislature.

……………………………………………………………… 3.7 Have you been in the service of the state for the past YES / NO

twelve months? 3.7.1 If so, furnish particulars.

……………………………………………………………… ………………………………………………………………

3.8 Do you, have any relationship (family, friend, other) YES / NO

with persons in the service of the state and who may be involved with the evaluation and or adjudication of this bid?

3.8.1 If so, furnish particulars. ……………………………………………………………… ……………………………………………………………… 3.9 Are you, aware of any relationship (family, friend, other) YES / NO

between a bidder and any persons in the service of the state who may be involved with the evaluation and or adjudication of this bid?

3.9.1 If so, furnish particulars

……………………………………………………………. …………………………………………………………….

3.10 Are any of the company’s directors, managers, principle YES / NO shareholders or stakeholders in service of the state? 3.10.1 If so, furnish particulars. ……………………………………………………………… ……………………………………………………………… 3.11 Are any spouse, child or parent of the company’s directors, YES / NO

managers, principle shareholders or stakeholders in service of the state? 3.11.1 If so, furnish particulars.

……………………………………………………………… ………………………………………………………………

CERTIFICATION

I, THE UNDERSIGNED (NAME) ………………………………………………………………………

CERTIFY THAT THE INFORMATION FURNISHED ON THIS DECLARATION FORM IS CORRECT.

I ACCEPT THAT THE STATE MAY ACT AGAINST ME SHOULD THIS DECLARATION PROVE TO BE FALSE.

………………………………….. …………………………………….. Signature Date ………………………………….……………………………………………………………………………. Position Name of Bidder

MBD 9

CERTIFICATE OF INDEPENDENT PROPOSAL DETERMINATION I, the undersigned, in submitting the accompanying proposal:

________________________________________________________________________

(Proposal Number and Description)

in response to the invitation for the proposal made by:

______________________________________________________________________________

(Name of Municipality / Municipal Entity)

do hereby make the following statements that I certify to be true and complete in every respect:

I certify, on behalf of: _______________________________________________________that:

(Name of Bidder)

1. I have read and I understand the contents of this Certificate;

2. I understand that the accompanying bid will be disqualified if this Certificate is found not to be true and

complete in every respect;

3. I am authorized by the bidder to sign this Certificate, and to submit the accompanying bid, on behalf of the

bidder;

4. Each person whose signature appears on the accompanying proposal has been authorized by the bidder to

determine the terms of, and to sign, the proposal, on behalf of the bidder;

5. For the purposes of this Certificate and the accompanying proposal, I understand that the word “competitor”

shall include any individual or organization, other than the bidder, whether or not affiliated with the bidder,

who:

(a) have been requested to submit a bid in response to this proposal invitation;

(b) could potentially submit a proposal in response to this proposal invitation, based on their

qualifications, abilities or experience; and

(c) provides the same goods and services as the bidder and/or is in the same line of business

as the bidder

6. The bidder has arrived at the accompanying proposal independently from, and without consultation,

communication, agreement or arrangement with any competitor. However communication between partners

in a joint venture or consortium³ will not be construed as collusive bidding.

7. In particular, without limiting the generality of paragraphs 6 above, there has been no consultation,

communication, agreement or arrangement with any competitor regarding:

(a) prices;

(b) geographical area where product or service will be rendered (market allocation)

(c) methods, factors or formulas used to calculate prices;

(d) the intention or decision to submit or not to submit, a proposal;

(e) the submission of a proposal which does not meet the specifications and conditions of the

proposal; or

(f) bidding with the intention not to win the proposal.

8. In addition, there have been no consultations, communications, agreements or arrangements with any

competitor regarding the quality, quantity, specifications and conditions or delivery particulars of the products

or services to which this proposal invitation relates.

9. The terms of the accompanying proposal have not been, and will not be, disclosed by the bidder, directly or

indirectly, to any competitor, prior to the date and time of the official bid opening or of the awarding of the

contract.

10. I am aware that, in addition and without prejudice to any other remedy provided to combat any restrictive

practices related to proposal and contracts, proposal that are suspicious will be reported to the Competition

Commission for investigation and possible imposition of administrative penalties in terms of section 59 of

the Competition Act No 89 of 1998 and or may be reported to the National Prosecuting Authority (NPA) for

criminal investigation and or may be restricted from conducting business with the public sector for a period

not exceeding ten (10) years in terms of the Prevention and Combating of Corrupt Activities Act No 12 of

2004 or any other applicable legislation.

………………………………………………… …………………………………

Signature Date

…………………………………………………. ………………………………

Position Name of Bidder

REFERENCE REV

TITLE SPECIFICATION FOR NEW AND REGENERATED MINERAL INSULATING OIL

CP_TSSPEC_116 2

DATE: February 2011

PAGE: 1 OF 15

TABLE OF CONTENTS

Page

INTRODUCTION ................................................................................................................................. 3

1 SCOPE ........................................................................................................................................... 3

2 NORMATIVE REFERENCES ........................................................................................................ 3

3 DEFINITIONS AND ABBREVIATIONS ......................................................................................... 3

4 REQUIREMENTS .......................................................................................................................... 4

4.1 General .................................................................................................................................. 4

5. TESTS ............................................................................................................................................ 5

6. MARKING AND PACKAGING ....................................................................................................... 5

7. DOCUMENTATION ....................................................................................................................... 5

8. QUALITY MANAGEMENT ............................................................................................................ 6

9. ENVIRONMENTAL MANAGEMENT ............................................................................................. 6

Annexure A - Bibliography ............................................................................................................... 7

Annex B - Revision information ....................................................................................................... 8

Annex C - Technical schedules A and B for new insulating oil .................................................... 9

Annex C - Technical schedules A and B for new insulating oil (Cont) ...................................... 10

Annex C - Technical schedules A and B for regenerated insulating oil .................................... 12

Annex C - Technical schedules A and B for regenerated insulating oil (Cont)......................... 13

Annex D – Stock Items .................................................................................................................... 15

SPECIFICATION FOR NEW AND REGENERATED MINERAL INSULATING OIL

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Recommendations for corrections, additions or deletions should be addressed to the: Technology Services Manager

City Power Johannesburg (Pty) Ltd

P O Box 38766

Booysens

2016


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INTRODUCTION

City Power makes use of power and distribution transformers in the provision of electricity to its customers. Efficiency and reliability of transformers are critical in terms of meeting statutory Quality of Supply parameters as well as customer satisfaction and cost-effective network operation. Mineral insulating oil plays a crucial role in the performance of transformers, performing the functions of electrical insulation and heat dissipation. Due to the scarcity and cost of virgin (new) transformer oil and in line with City Power’s corporate responsibility in terms of environmental awareness and resource renewal, City Power will, where possible, give preference to used insulating oil that has been regenerated to the standard of SANS 555.

1 SCOPE

This specification defines City Power’s requirements for new and regenerated transformer oil in accordance with SANS 555.

2 NORMATIVE REFERENCES

The following documents contain provisions that, through reference in the text, constitute requirements of this specification. At the time of publication, the editions indicated were valid. All standards and specifications are subject to revision, and parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the documents listed below.

SANS 555, Mineral insulating oil for transformers and switchgear (uninhibited)

SANS 290: 2007, Mineral insulation oils – Management of polychlorinated biphenyls (PCBs)

NRS 079-1, Mineral insulating oils (Uninhited) Part 1: Purchase, management, maintenance and testing

IEC 61619, Insulating liquids – Contamination by polychlorinated biphenyls (PCBs) –Method of determination by capillary column gas chromatography

IEC 60666, Detection and determination of specified additives in mineral insulating oils

3 DEFINITIONS AND ABBREVIATIONS

The definitions and abbreviations in the above documents shall apply to this specification.


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PAGE 4 OF 15

4 REQUIREMENTS

4.1 General

4.1.1 All virgin (new) oil shall comply fully with the requirements of SANS 555 and this specification, including the values indicated in the A&B Schedules. Reference to compliance with SANS 555 shall mean compliance with this specification where the requirements of this specification are more stringent than those of SANS 555.

4.1.2 The process of regeneration shall entail the removal of water, suspended particles, inorganic acid, deleterious matter, dissolved acids and chemical materials and gases, as well as the adjustment of the chemical and physical properties of the reclaimed oil to ensure compliance with SANS 555.

4.1.3 After regeneration, the oil shall match or exceed the requirements of SANS 555 and the values indicated in the A & B Schedules of this specification. Reference to compliance with SANS 555 shall mean compliance with this specification where the requirements of this specification are more onerous than those of SANS 555.

4.1.4 All new (unused) mineral insulating oil shall be polychlorinated biphenyl (PCB) free when tested in accordance with IEC 61619.

4.1.5 New mineral insulation oil for transformers shall be classified as uninhibited transformer oils (U), contain no antioxidant in accordance with IEC 60666.

4.1.6 All regenerated (reclaimed) mineral insulation oil polychlorinated biphenyl (PCB) level shall not be more than 20 mg/kg in accordance with IEC 61619.

4.1.7 The quantity of oil supplied or regenerated shall be determined (in litres) by calibrated flow meters.

4.1.8 The tenderer shall be fully responsible for the cleanup and rehabilitation of the site for all oil spillages emanating during the oil supply and/or regeneration process.

4.1.9 All new and regenerated oil shall bear the SANS 555 mark.

4.1.10 The oil may be required to be collected, regenerated and delivered in accordance with one or more of the following methods:

a) Collection in bulk, regeneration and supply in 210 litre drums;

b) Collection in bulk, regeneration and supply in bulk;

c) Circulation and regeneration of oil in transformer on site;

d) Circulation and regeneration of oil from tank to tank at Reuven Workshops; or

e) Supply of oil (in 210 litre drums) where the source oil is not supplied by City Power.

f) All oil supplied to City Power in drums shall be delivered in Class A drums. Any signs of rust on the drums shall be deemed unacceptable and such drums shall be returned to the supplier.

g) All old oil collected from City Power, in old or damaged drums, for disposal, shall be disposed of in their entireity by the successful tenderer – disposal includes old or damaged drums.


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PAGE 5 OF 15

4.1.11 In all cases except 4.1.8 (e) above, the tenderer will be required to collect the used oil from City Power, regenerate it and return the oil to City Power.

4.1.12 For bulk collection, regeneration and delivery (clause 4.1.8 (b)) the oil shall be delivered in a tanker of suitable capacity. Tenderers shall state what percentage of oil is lost in the regeneration process in all cases where oil is collected in bulk.

4.1.13 For on-site regeneration in transformers, the minimum capacity of the oil regeneration plant used shall not be less than 3 000 litres and the flow rate capacity of the plant shall not be less than 4 500 litres per hour. The personnel responsible for, or engaged in, operation of the plant shall be proficient in its operation. A 24 hour service shall be provided for on-site regeneration.

4.1.14 For on-site regeneration at Reuven (tank to tank) the minimum flow rate capacity of the oil regeneration plant shall not be less than 4 500 litres per hour. The personnel responsible for, or engaged in, operation of the plant shall be proficient in its operation. A 24 hour service shall be provided for on-site regeneration.

5. TESTS

5.1 Each batch/lot of regenerated oil delivered shall be tested in accordance with SANS 290 (for PCBs) and SANS 555 and a test certificate at the time of filling, certifying compliance, shall be provided by the tenderer for acceptance of the regenerated oil by City Power.

5.2 Each batch/lot of used oil collected shall be tested in accordance with SANS 290. A test report shall be submitted to the Laboratory Manager:

5.3 All test certificates shall be issued by a certified test laboratory.

5.4 All costs associated with the testing described above shall be borne by the tenderer and included in the quoted price of regeneration. No claims in this respect shall be entertained by City Power.

5.5 City Power reserves the right to test any oil supplied in accordance with SANS 555 up to two weeks after delivery. Should the oil fail the tests the entire batch/lot may be returned, at the sole discretion of City Power, to the supplier for further processing at no cost to City Power.

5.6 Should any dispute arise between City Power and the tenderer, an independent test authority shall test the oil at the cost of whichever party is proven wrong.

6. MARKING AND PACKAGING

6.1 In the case of oil which is supplied in 210 litre drums, the drums shall become the property of City Power. The drums shall not be galvanised on any surface which are in contact with the oil.

6.2 The packing shall further be in accordance with clause 4.1.2 of CP_TSSTAN_014.

6.3 All drums containing new (SAP 552) or regenerated (SAP 551) mineral insulating oil shall be labelled in accordance with City Power SAP numbers

7. DOCUMENTATION

7.1 Proof of bearing the SANS mark shall be submitted with the tender.


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7.2 Documentation pertaining to the tests contemplated in clause 5 of this specification shall be supplied. Sample test reports of actual samples will suffice.

7.3 Details of the test laboratory referred to in clause 5.4 shall be supplied.

7.4 Any other relevant technical data, including environmental contingency plans, shall be submitted.

7.5 Documentation pertaining to the tenderer’s ISO 9001 and ISO 14001 accreditation shall be submitted with the tender.

8. QUALITY MANAGEMENT

A quality management plan shall be set up in order to assure the proper quality management of the mineral insulating oil during development, production and regeneration phases. Guidance on the requirements for a quality management plan may be found in the ISO 9001. The details shall be subject to agreement between City Power SHEQ and the Supplier.

9. ENVIRONMENTAL MANAGEMENT

An environmental management plan shall be set up in order to assure the proper environmental management of mineral insulating oil throughout its entire life cycle (i.e. development, production, and disposal phases). Guidance on the requirements for an environmental management system may be found in ISO 14001 standards. The details shall be subject to agreement between City Power and the Supplier. This is to ensure that the product created conforms to environmental standards and City Power SHEQ Policy.


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Annexure A - Bibliography

EThekwini Electricity technical specification for regeneration of used insulating oil

Previous GJME specification for regeneration of used insulating oil


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Annex B - Revision information

DATE REV. NO. NOTES

April 2004 0 First issue

Oct 2008

Feb 2011

1

2

Format changes

4.1.8, f) & g) added

All oil supplied to City Power in drums shall be delivered in Class A drums. Any signs of rust on the drums shall be deemed unacceptable and such drums shall be returned to the supplier.

All old oil collected from City Power, in old or damaged drums, for disposal, shall be disposed of in their entireity by the successful tenderer – disposal includes old or damaged drums.

Cover paper updated

Updating of 4.1.4 and 4.1.6

Inclusion of 4.1.5

Inclusion of 6.4

Edited 7.5

Edited 8. Quality management

Edited 9 Environmental management

Updated technical schedules


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Annex C - Technical schedules A and B for new insulating oil Schedule A: Purchaser's specific requirements Schedule B: Guarantees and technical particulars of product/services offered

Item Sub-clause of

CP_TSSPEC_116

Description Schedule A Schedule B

1 4.1.1 Standard to which new oil complies SANS 555

2 4.1.4 Standard to which PCB testing is carried out

IEC 61619

3 4.1.5 Oil type Type U Uninhibited

4 Colour ISO ≤ 0.5 max

5 Appearance Clear, free of sediment and

suspended matter

6 Density at 20°C Kg/dm³ ≤ 0,910 max

7 Kinemetic viscosity at 40°C mm²/s ≤ 11 max

8 Furans and fufural mg/kg ≤ 0.05 max

9 Flash point °C ≥ 140 min

10 Pour point °C ≤ - 20 max

11 Aromatic content % 6 – 14 max

12 Total fufural and furans mg/Kg 0,1 max

13 Polyaromatic hydrocarbon % ≤ 3,0 max

14 Aniline point °C 63 to 84

15 Interfacial tension at 25 °C mN/m ≥ 40 min

16 Neutralization value mg KOH/g

≤ 0,01 max

17 Corrosive sulphur Non-corrosive

18 Moisture Mg/kg ≤ 10 max (1)

≤ 20 max (2)

≤ 10 max (3)

19 Anti-oxidant additives % by mass

No additives

20 Oxidation stability acidity after 164 h at 120°C

Mg KOH/g

≤ 0,6 max

21 Oxidation stability sludge after 164 h at 120°C

% by mass

≤ 0,3 max

(1) Prior to transportation (2) On delivery (3)Prior to filling

Tender Number: _________________________________________________________________

Tenderer’s Authorised Signatory: _________________________________ __________________

Name in block letters Signature

Full name of company: _____________________________________________________________


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Annex C - Technical schedules A and B for new insulating oil (Cont) Schedule A: Purchaser's specific requirements Schedule B: Guarantees and technical particulars of product/services offered

Item Sub-clause of CP_TSSPEC_116


22 Dielectric strength kV/2,5 mm ≥ 70 min (1)

≥ 60 min (2)

≥ 70 min (3)

23 Dissipation factor at 90°C ≤ 0,005 max

24 Gassing tendency mm³/min ≤ +5

25 Maximum particulate contamination per 100ml

Prior to filling

≤ 4000 particles > 5µm

≤ 500 particles > 15µm or 12/9 (ISO

rating)(3)

On delivery ≤ 130 000 particles >5µm

≤ 16 000 particles >15µm or 17/14 (ISO rating) (2)

26 Silicon/silicone content ppm Not detectable

27 Polychlorinated biphenyl mg/kg Not detectable

28 6 Is marking and packing in accordance with clause 6?

Yes/No Yes

29 7 Is all documentation requested in clause 7 supplied?

Yes/No Yes

30 8 ISO 9001 accreditation

(Quality Management)

Yes/No Yes


(Environmental Management)

Yes/No Yes


Tender Number: _________________________________________________________________





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Technical schedules A and B

Deviation schedule for new insulating oil

Any deviations offered to this specification shall be listed below with reasons for deviation. In addition, evidence shall be provided that the proposed deviation will at least be more cost-effective than that specified by City Power.


Proposed deviation

Tender Number: _________________________________________________________________





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Annex C - Technical schedules A and B for regenerated insulating oil

Schedule A: Purchaser's specific requirements Schedule B: Guarantees and technical particulars of product/services offered



1 4.1.1 Standard to which new oil complies SANS 555

2 4.1.4 Standard to which PCB testing is carried out

IEC 61619

3 4.1.5 Oil type Type U Uninhibited

4 Colour ISO ≤ 1.0 max

5 Appearance Clear, free of sediment

and suspended

matter

6 Density at 20°C kg/dm³ ≤ 0,895 max

7 Kinemetic viscosity at 40°C mm²/s ≤ 16,5 max

8 Flash point °C ≥ 140 min

9 Pour point °C ≤ - 20 max

10 Aromatic content % 6 – 14 max

11 Total fufural and furans mg/kg 0,1 max

12 Ployaromatic hydrocarbon % ≤ 3,0 max

13 Aniline point °C 63 to 84

14 Interfacial tension at 25 °C mN/m ≥ 40 min

15 Neutralization value mg KOH/g

≤ 0,03 max

16 Corrosive sulphur Non-corrosive

17 Moisture mg/kg ≤ 10 max (1)

≤ 20 max (2)

≤ 10 max (3)

18 Anti-oxidant additives % by mass

No additives

19 Oxidation stability acidity after 164 h at 120°C

mg KOH/g

≤ 1.2 max

20 Oxidation stability sludge after 164 h at 120°C

% by mass

≤ 0,8 max


Tender Number: _________________________________________________________________





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Annex C - Technical schedules A and B for regenerated insulating oil (Cont)

Schedule A: Purchaser's specific requirements Schedule B: Guarantees and technical particulars of product/services offered



21 Dielectric strength kV/2,5 mm ≥ 70 min (1)

≥ 60 min (2)

22 Dissipation factor at 90°C ≤ 0,005 max

Maximum particulate contamination per 100ml

Prior to filling

≤ 4000 particles >

5µm

≤ 500 particles >

15µm or 12/9 (ISO

rating)(3)

On delivery ≤ 130 000 particles

>5µm

≤ 16 000 particles

>15µm or 17/14 (ISO rating) (2)

23 Silicon/silicone content ppm < 3

24 Polychlorinated biphenyl mg/kg ≤ 20 max

25 6 Is marking and packing in accordance with clause 6?

Yes/No Yes

26 7 Is all documentation requested in clause 7 supplied?

Yes/No Yes


(Quality Management)

Yes/No Yes


(Environmental Management)

Yes/No Yes


Tender Number: _________________________________________________________________





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Technical schedules A and B

Deviation schedule for regenerated insulating oil

Any deviations offered to this specification shall be listed below with reasons for deviation. In addition, evidence shall be provided that the proposed deviation will at least be more cost-effective than that specified by City Power.

Item Sub-clause of

CP_TSSPEC_116

Proposed deviation

Tender Number: _________________________________________________________________





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Annex D – Stock Items

Material Group: OILS-TX

Item SAP No. SAP Short Description SAP Long Description

1 552 AVS_OIL INSUL NEW (210 L) OIL, MINERAL, INSULATING, VIRGIN, FOR TRANSFORMERS AND SWITCHGEAR, SUPPLIED IN 210 LITRE DRUM. ITEM SPECIFICATION CP_TSSPEC_116.

2 551 AVS_OIL INSUL REGEN NON EXCHANGE (210 L)

OIL, MINERAL, INSULATING, REGENERATED, NON EXCHANGE, FOR TRANSFORMERS AND SWITCHGEAR, SUPPLIED IN 210 LITRE DRUM. ITEM SPECIFICATION CP_TSSPEC_116.

3 11900 AVS_OIL INSUL REGEN EXCHANGE (210 L)

OIL, MINERAL, INSULATING, REGENERATED, EXCHANGE, FOR TRANSFORMERS AND SWITCHGEAR, SUPPLIED IN 210 LITRE DRUM. ITEM SPECIFICATION CP_TSSPEC_116.

4 1221 AVS_OIL INSUL REGEN NON EXCHANGE (BULK)

OIL, MINERAL, INSULATING, REGENERATED, NON EXCHANGE, FOR TRANSFORMERS AND SWITCHGEAR, SUPPLIED IN BULK. ITEM SPECIFICATION CP_TSSPEC_116.

5 1222 AVS_OIL INSUL NEW (BULK) OIL, MINERAL, INSULATING, VIRGIN, FOR TRANSFORMERS AND SWITCHGEAR, SUPPLIED IN BULK. ITEM SPECIFICATION CP_TSSPEC_116.

6 1223 AVS_OIL INSUL REGEN EXCHANGE (BULK)

OIL, MINERAL, INSULATING, REGENERATED, EXCHANGE, FOR TRANSFORMERS AND SWITCHGEAR, SUPPLIED IN BULK. ITEM SPECIFICATION CP_TSSPEC_116.

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TITLE STANDARD FOR THE MANAGEMENT OF MINERAL INSULATING OIL

CP_TSSTAN_014 1

DATE: APRIL 2013

PAGE: 1 OF 21

Page

FOREWORD ....................................................................................................................................... 2

INTRODUCTION ................................................................................................................................. 3

1. SCOPE ........................................................................................................................................... 3

2. NORMATIVE REFERENCES......................................................................................................... 3

3. DEFINITIONS AND ABBREVIATIONS ......................................................................................... 3

4. REQUIREMENTS ........................................................................................................................... 3

4.1 Purchasing Requirements ...................................................................................................... 3

4.2 Oil requirements ..................................................................................................................... 6

4.3 Compatibility requirements and formulation ........................................................................... 7

4.4 Standard Tests and Analysis ................................................................................................. 7

4.5 Electrical Equipment Classification ........................................................................................ 9

5. MANAGEMENT ............................................................................................................................ 10

5.1 Moisture Assessment ........................................................................................................... 10

5.2 Evaluation of oil in service .................................................................................................... 12

5.3 Frequency of evaluation of oil in service .............................................................................. 15

5.4 Packaging and bulk deliveries .............................................................................................. 16

5.5 Storage of oil ........................................................................................................................ 16

5.6 Polychlorinated Biphenyl (PCB) contamination ................................................................... 18

5.7 Oil for filling and topping units .............................................................................................. 18

5.8 Oil tests and limits for new and repaired units ..................................................................... 18

5.9 Responsibilities .................................................................................................................... 19

6. QUALITY ASSURANCE .............................................................................................................. 20

7. ENVIRONMENTAL MANAGEMENT ........................................................................................... 20

REVISION INFORMATION ............................................................................................................... 21

STANDARD FOR THE MANAGEMENT OF MINERAL INSULATING OIL

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FOREWORD

Recommendations for corrections, additions or deletions should be addressed to the:

Technology Services Manager

City Power Johannesburg (Pty) Ltd

P O Box 38766

Booysens

2016


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INTRODUCTION

Mineral insulating oils are widely used in City Power for cooling and insulation of transformers and switchgear. This standard is set to look at the process of the management of the mineral oil from purchase, handling, testing and disposal. This standard defines the type of oil to be used and the type of tests to be carried out for oil-filled transformers and switchgear.

1. SCOPE

This standard is applicable to the purchase, testing and maintenance of new mineral oil, storage and handling, testing, maintenance of the oil that is in service and the regeneration and/or disposal of used mineral oil. It does not apply to oil-filled instrument transformers or oil filled transformer bushings.

2. NORMATIVE REFERENCES

The following documents contain provisions that, through reference in the text, constitute requirements of this specification. At the time of publication, the editions indicated were valid. For undated references, the latest edition of the referenced document (including any amendments) applies. All standards and specifications are subject to revision, and parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the documents listed below.

SANS 290, Mineral insulating oils – Management and handling of polychlorinated biphenyls (PCB).

SANS 555, Mineral insulating oil for transformers and switchgear (uninhibited).

SANS 10229, Packaging of dangerous goods for road and rail transportation in South Africa.

ISO 9001, Quality management systems – Requirements

ISO 14001, Environmental management systems – Requirements with guidance for use

NRS 079 -1, Mineral Insulating Oils (Uninhibited and Inhibited).

IEC 60156, Insulating liquids — Determination of the breakdown voltage at power frequency —Test method.

IEC 60296, Fluids for Electro Technical applications – Unused mineral insulating oils for transformers and switchgear.

IEC 60422, Supervision and maintenance guide for mineral insulating oils in electrical equipment.

IEC 60666, Detection and determination of specified anti oxidant additives in insulating oils.

IEC 62535, Insulating liquids – Test method for detection of potentially corrosive sulphur in used and unused mineral insulating oils.

3. DEFINITIONS AND ABBREVIATIONS

The definitions and abbreviations in the above documents shall apply to this standard.

4. REQUIREMENTS

4.1 Purchasing Requirements

4.1.1 The oil supplier shall guarantee that the oil delivered complies with the “zero count PCB” requirement. This guarantee shall be in the form of a certificate and records thereof shall be kept for auditing purposes.

4.1.2 The oil supplier shall guarantee that, at the point of loading into dedicated supplier tankers, the oil conforms to the requirements of “new oil” or “regenerated oil” respective ly. This guarantee shall be in the form of a certificate, of which a copy shall accompany the delivery note. Records thereof shall be kept for auditing purposes.


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4.1.3 Table 1: Recommended limits for oil properties of new (virgin) inhibited oils (Type I)

1 2 3 4

Oil Unit Specification Reference and/or test method

Oil type Naphthenic (Type I) Inhibited (Type I)

Colour ISO units 0.5 max. ASTM D1500

Inhibitor % Inhibited (see Anti-oxidant additives)

IEC 60666

Appearance Clear, free of sediment and suspended matter

IEC 60422

Density at 20 °C kg/dm3 0,895 max. ISO3675/ISO12185/ASTM

D1298

Kinematic viscosity at 40 °C

mm2/s 12 max. ASTM D445/ISO 3104

Furans and furfural mg/kg 0.05 max. IEC 61198

Flash point ºC 140 min. ASTM D93/ISO 2719 (closed cup)

Pour point ºC – 20 max. ASTM D97

Aromatic content % 6 to14 max. ASTM D2140/IEC 60590

Total furfural and furans mg/kg 0.1 max IEC 61198

Polyaromatic hydrocarbons % 3, 0 max. BS2000 / IP 346

Aniline point C 63 to 84 ASTM D611

Interfacial tension at 25 ºC mN/m 40 min. ASTM D971

Neutralization value mg KOH/g 0, 01 max. IEC 62021-1

Corrosive sulphur Non-corrosive IEC 62535

Moisture mg/kg 10 max. (1)

20 max. (2)

10 max. (3)

IEC 60814 and ASTM D1533

Anti-oxidant additives % by mass 0.4 max IEC 60666

Oxidation stability RBOT minutes 220 min ASTM D2112 (RBOT)

Dielectric strength kV/2,5 mm 70 min. (1)

60 min. (2)

70 min. (3)

IEC 60156

Dissipation factor at 90 ºC 0, 005 max. BS 5737 / IEC 61620 / IEC 60247

Gassing tendency mm3/min +5 IEC 60628 (Method A)/ASTM

D2300

Maximum particulate contamination per 100 ml

Prior to filling

4000 particles > 5 m

500 particles > 15 m or 12/9 (ISO rating)

(3)

ISO 4406 (1999)/IEC 60970/IEC 60422

On Delivery :

130 000 particles > 5 m

16 000 particles > 15 m or 17/14 (ISO rating)

(2)

Silicon/silicone Content ppm None detectable ASTM D6595

Polychlorinated biphenyl mg/kg None detectable IEC 60619/EPA 600/ASTM D4059

NOTE 1 Prior to transportation

NOTE 2 On delivery

NOTE 3 Prior to filling

NB: Inhibited oil (Type I): Insulating oil that has an antioxidant additive added to prevent oxidation typical values are between a minimum of 0.08 % to a maximum of 0.4 % anti oxidant.


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4.1.4 Table 2: Recommended limits for oil properties of new (virgin) oil for uninhibited oils (Type U)

1 2 3 4

Oil Unit Specification Reference and/or test method

Oil type Naphthenic Type U (Type U) Uninhibited

Colour ISO units 0.5 max. ASTM D12500

Inhibitor Uninhibited IEC 60666

Appearance Clear, free of sediment and suspended matter

IEC 60422

Density @ 20 °C kg/dm3 0, 910 max. ISO 3675/ISO 12185/ASTM

D1298

Kinematic viscosity @ 40 °C mm2/s 11 max. ASTM D445/ISO 3104

Furans and furfural mg/kg 0.05 max. IEC 61198

Flash point ºC 140 min. ASTM D93/ISO 2719 (closed cup)

Pour point ºC –20 max. ASTM D97

Aromatic content % 6 to 14 max. ASTM D2140/IEC 60590

Total furfural and furans mg/kg 0.1 max IEC 61198

Polyaromatic hydrocarbons % 3, 0 max. BS2000 / IP 346

Aniline point C 63 to 84 ASTM D611

Interfacial tension @ 25 ºC mN/m 40 min. ASTM D971

Neutralization value mg KOH/g 0.01 max. IEC 62021-1

Corrosive sulphur Non-corrosive IEC 62535

Moisture mg/kg 10 max. (1)

20 max. (2)

.

10 max. (3)

IEC 60814 / ASTM D1533

Anti-oxidant additives % by mass No additives IEC 60666

Oxidation stability acidity after 164 h @ 110 ºC

mg KOH/g 0.6 max. ASTM D2440-2004

Oxidation stability sludge after 164 h @ 110 ºC

% by mass 0, 3 max. ASTM D2440-2004

Dielectric strength kV/2,5 mm 70 min. (1)

60 min. (2)

70 min. (3)

IEC 60156

Dissipation factor @ 90 ºC 0,005 max. BS 5737 / IEC 61620 / IEC 60247

Gassing tendency mm3/min +5 IEC 60628 (method A)/ASTM

D2300

Maximum particulate contamination per 100 ml

Prior to filling :

4000 particles > 5 m

500 particles > 15 m or 12/9 (ISO rating)

(3)

ISO 4406 (1999) / IEC 60970/IEC 60422

On Delivery :

130 000 particles > 5 m

16 000 particles > 15 m or 17/14 (ISO rating)

(2)

Silicon/silicone Content ppm None detectable ASTM D6595

Polychlorinated biphenyl mg/kg None detectable IEC 60619/EPA 600/ASTM D4059

NOTE 1 Prior to transportation

NOTE 2 On delivery

NOTE 3 Prior to filling

NB: Uninhibited oil (Type U): Insulating oil that has no antioxidant additive present in the oil but may have other additives.


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4.2 Oil requirements

4.2.1 Oil can enter the process as virgin oil supplied to a site, or as oil that has been recycled through a regeneration process, or as oil supplied in the equipment when purchased new or after a repair. There may thus be slight differences in the oil in different parts of the equipment. Regenerated oil may contain low levels of PCB (less than 20 ppm) since nearly all the oil in South African equipment contains low levels of PCB contamination (see table 4). New or regenerated oil that has been placed in the equipment will contain tiny particles due to the exposure to the cellulose insulation. It is hence vital that the various stages of oil life be defined by different applicable criteria.

4.2.2 Gas in oil limits

In essence there should be no gases present in new or regenerated oil. However, due to the fact that when testing these parameters and the atmospheric availability of some of these gases there would be traces of the atmospheric gases being present in the oil when tested. Table 3 below indicates the acceptable limits for all oil returning to service.

4.2.3 Table 3: Gas in oil limits

1 2 3

Gas Symbol Detected new oil

Hydrogen H2 None detectable

Oxygen O2 < 10 000 ppm

Nitrogen N2 < 30 000 ppm

Methane CH4 None detectable

Carbon Monoxide CO None detectable

Carbon Dioxide CO2 < 50 ppm

Ethylene C2H4 None detectable

Ethane C2H6 None detectable

Acetylene C2H2 None detectable

4.2.4 Table 4: Oil regeneration pre-tests

1 2 3 4

Test description Unit Specification Test method/Reference

Polychlorinated Biphenyls

ppm ≤ 20 0 (1)

EPA 600

Silicon contamination ppm <3 (2)

ASTM D6595

Foaming mm 300/0 mm ASTM D892-03

Acidity mg KOH/g 0.3 IEC 62021-1

Polyaromatic hydrocarbon

% 3, 0 max. BS2000 part 346

Inhibitor Content (4)

% by mass Dependant on Type No additives Type U or

trace amounts of inhibitor Type I

IEC 60666

Corrosive sulphur Non-corrosive (3)

IEC 62535 NOTE (1) To be added once the PCB directive is published NOTE (2) Higher values may be accepted subject to the foaming tests being acceptable. NOTE (3) Consider passivation of the oil. NOTE (4) When the base oil was operated with insufficient inhibitor the condition may not allow the oil to be regenerated

economically

NB: In the interests of minimising the Polychlorinated Biphenyls levels in the electricity supply industry any oil that is regenerated must have a contamination level of ≤ 20 ppm prior the regeneration process.


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4.3 Compatibility requirements and formulation

4.3.1 The supplier shall notify asset owner of any significant formulation changes that may affect the insulation or cooling performance and/or its compatibility with existing equipment and/or existing insulating oil and describe the nature of the change.

4.3.2 Compatibility testing shall be carried out by the asset owner, if required.

4.3.3 The supplier shall inform asset owner of any additives and the nature of the additive in the oil.

4.4 Standard Tests and Analysis

4.4.1 Oil tests are categorised into different tests depending on the intention of the analysis. These analyses are described below in table 5, and the sample container and volume requirements are stipulated in table 6.

4.4.2 The analysis shown in column 1 of table 5 shall be performed on electrical equipment that contains mineral oil.

4.4.3 All new or repaired units shall only be commissioned after the test results of the oil comply with the following limits. 4.4.3.1 DS not lower than 70 kV/2,5 mm gap; 4.4.3.2 WC not more than 10 mg/kg.


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4.4.4 Table 5 — Standard tests and analyses

1 2 3 4

Analysis Test set

Recommended method of analysis Sub-clause

Dissolved Gas Analysis (DGA) 1 IEC 60628/ASTM D3612 4.2.3

Dielectric strength 1/2/3/4 IEC 60156 4.2.4

Moisture content 1/2/3/4 IEC 60814 and ASTM D1533 4.2.5

Acidity 1/2/3/4 IEC 62021-1 4.2.6

Furanic analysis 2 IEC 61198 4.2.7

Colour 2/3/4 ASTM D1500 4.2.8

Dielectric dissipation factor (Tan delta) 2/3/4 BS 5737 or IEC 61620 and IEC 60247

4.2.9

Sediment and sludge 2/3/4 IEC 60422 4.2.10

Interfacial tension 2/3/4 ASTM D971 4.2.11

Particle quantification 3/4 ISO 4406 /IEC60970 4.2.12

Polychlorinated Biphenyl (PCB) 3/4 IEC 60619 or EPA 600 or ASTM D4059

4.2.13

Carbon composition 3 ASTM D2140 4.2.16

Aromatics 3 ASTM D2140/IEC 60590 4.2.17

Viscosity 3 ASTM D445/ISO 3104 4.2.18

Corrosive sulphur 3/4 IEC 62535 4.2.14

Aniline point 3 ASTM D611 4.2.19

Silicon/silicone 3/4 ASTM D6595 4.2.20

Resistivity 3 IEC 60246 4.2.21

Inhibitor content/FTIR verification* 2/3/4 IEC 60666 4.2.15

Oxidation stability 3 ASTM D2440/IEC61125 Method C /ASTM D2112 (RBOT)

4.2.22

Flash point 3 ASTM D93 /ISO 2719 (Closed Cup) 4.2.23

Density 3 ISO 3675 or 12185/ASTM D1298 4.2.24

Gassing tendency 3 IEC 60628 Method A/ASTM D2300 4.2.25

Passivator content ** 2/3 HPLC method (NT 24) 4.2.26

Pour Point 3 ASTM D 97

Polyaromatic Hydrocarbons 3 BS 2000 / IP 346

Appearance 3/4 IEC 60422 4.2.8 *Inhibitor content if added **Passivator content if added.

4.4.5 Table 6 — Sample container requirements

1 2 3

Test set Description Minimum sample container required

Test set 1 Routine 1 litre sampling tin or 1 litre tin and 50 ml glass syringe

Test set 2 Age assessment 3 X 1 litre tins

Test set 3 Initial approval and annual verification tests

2 X 5 litre tins (new aluminium containers)

Test set 4 Quality assurance criteria tests (prior to transfer of oil into oil storage containers (i.e. drums, bags, electrical apparatus, Iso-tanks etc.))

2 X 1 litre sampling tins (new), 2 X 200 ml plastic bottle completely full, 1 X 200 ml 80 % full, 1 X ISO certified clean glass bottle 80 % full


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4.5 Electrical Equipment Classification

5.1.1 The classification shown in table 6 is applicable to this standard. Table 7 — Electrical equipment classification

1 2 3

Category Classification Recommended Oil

Class O Power transformers and reactors with a nominal system voltage > 400 kV.

Inhibited Oil (Type I)

Class A Power transformers and reactors with a nominal system voltage > 132 kV and < 400 kV. Also includes power transformers of any related voltage where continuity of supply is vital and similar equipment for special applications where equipment is required to operate under onerous conditions.

Inhibited Oil (Type I)

Class B Power transformers and reactors with a nominal system voltage > 44 kV and < 132 kV (other than those in class A).

Uninhibited oil (Type U)5

Class C Power transformers and reactors for medium voltage and low-voltage auxiliary, neutral earthing compensators, neutral earthing resistors, earthing resistors and earthing transformers, including diverter tanks of on-load tap changers application, e.g. of nominal system voltages < but excluding 44 kV and traction transformers (other than those in class A).

Uninhibited oil (Type U)

Class D Instrument, bushing, or protection transformers and oil-filled circuit-breakers with a nominal system voltage > 132 kV.


Class E Instrument, bushing, or protection transformers with a nominal system voltage < 132 kV. Oil-filled circuit-breakers with a nominal system voltage > 44 kV < 132 kV.


Class F Diverter tanks of on-load tap changers, including combined selector/diverter tanks and transformers with a nominal system voltage > 44 kV.

Uninhibited oil (Type U)5

Class G Oil-filled circuit-breakers with a nominal system voltage > 11 kV < 44 kV.


Class H Oil-filled switches, a.c. metal-enclosed switchgear and control gear with a nominal system voltage < 11 kV.


NOTE 1 Separated selector tanks of on-load tap changers belong to the same class as the transformer that they are installed on.

NOTE 2 Oil-impregnated paper bushings and other hermetically sealed units will form part of class D. Inception testing will be performed on these units and thereafter testing will only be performed when these units are out of service. No intrusive testing will be performed on these units.

NOTE 3 Regardless of the size or voltage of a unit, a risk assessment, or strategic consideration, may justify condition monitoring frequency or analyses requirements of a higher classification.

NOTE 4 For practical reasons, some owners of electrical equipment can decide that their equipment up to 1 MVA are not included in this classification. Routine monitoring programmes can not be considered economical for this type of equipment.

NOTE 5 (Type I) or (Type U) classification may need to be altered according to user requirements.


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5. Management

5.1 Moisture Assessment

5.1.1 To avoid continuous reference to a graph to correlate the moisture content and temperature, moisture in the oil shall be normalized to 20 C (this temperature is based on the fact that the diffusion rate of moisture below 20 C is too slow to reach equilibrium). This will only apply to equipment that contains paper insulation.

5.1.2 The correction factor can be calculated as follows:

tf

(-0,04 )s= 2,24e

Where f is the correction factor;

ts is the oil sampling temperature, in degrees Celsius.

NOTE This formula is not applicable in the case of temperatures below 20 °C.

5.1.3 In the case of temperatures below 20 C, a limit of ≤ 10 ppm moisture applies. If a more accurate interpretation is required, the water solubility of that specific oil will be used and the percentage of water saturation can be calculated from that.

5.1.4 The recommended frequency of insulating oil analyses on electrical equipment (sampling frequency per classification) is shown in table 8.


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Table 8 — Recommended frequency of insulating oil analysis on electrical equipment

1 2 3 4 5 6

Condition Class O Class A Class B Class C Classes D, E, F,

G and H

After commissioning/ Re commissioning

routine tests (Test set 1)

48 h after, 1 week after, 1 month after, 3 months after

48 h after, 1 week after, 1 month after,

3 months after

48 h after, 1 month after,

3 months after

48 h after, 1 month after, 6 months after

Special request

Routine tests (Test set 1)

6 monthly 6 monthly to yearly

6 monthly to yearly

a

Yearlya Special request

Inhibitor (anti oxidant) additive (part of Test

set 4)

Prior to filling 6 months after

filling and every 2 years

Prior to filling 6 months after filling

and every 2 years

Prior to filling (if stipulated)/

every 2 year/Not

tested if not present

Not tested Not tested

Corrosive sulphur Passivator (part of

Test set 4)

1 week after addition

6 months to monitor

consumption There after every two

years (If added)


6 months to monitor


years (If added)


6 months to monitor


years (If added)


6 months to monitor


years (If added)

Not tested

Ageing assessment (Add list of tests)

Once a year Every second year

Dependant on application

Not tested Not tested

Special investigations (Test set 3)

Special request

Special request

Special request

Special request

Special request

NOTE These frequencies refer to a normal routine test programme and if any of the properties indicate significant deterioration, these periods should be shortened accordingly.

NOTE If the oil changes suppliers more than once then the oil quality test set shall apply after each supplier change


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5.2 Evaluation of oil in service

5.2.1 It is almost impossible to compile a set of regulations that will be applicable to all equipment. Some equipment is more tolerant of unfavourable conditions, whereas others will be very sensitive. It is always recommended to take a second sample, before taking action, in order to ensure that the results obtained are in actual fact a true reflection of the state of the electrical equipment. The recommended limits and actions for oil in service are shown in table 9.

5.2.2 The acidity of oil in a unit shall be related to the age of the unit. Decisions regarding the placement or treatment of the oil in such units, based on the acidity concentration shall be made by the City Power’s oil laboratory together with a Substations Specialist who shall consider all relevant factors.


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5.2.3 Table 9 – Recommended limits and actions for oil in service

1 2 3 4

Analysis Class Recommended

action limits Recommended action

Breakdown voltage, kV / 2,5 mm

O and A < 60 Resample and identify any trend. Recondition oil by means of

filtration. B < 50

F < 40

C < 30

Moisture content, mg/kg or ppm (normalized to 20 C)

O and A > 10 Resample and identify any trend. Recondition oil by means of

filtration or purification (or both). B > 15

F > 25

C > 30

Acidity, mg KOH / g oil O and A > 0,10 Resample and identify any trend. Recondition oil by means of

regeneration if IFT, colour and sludge also deteriorate.

B > 0,15

C > 0,20

Passivator ALL Classes

< 25 ppm

The Passivator needs to be topped up to 100 ppm when the level drops

below the prescribed limit.

Anti oxidant / Inhibitor O and Aa < 0.1%

The inhibitor needs to be topped up to 0.4% when the level drops below

the prescribed limit.

Furanic analysis, mg/kg per year

O and A Increase of > 0,05 and DP < 300

This process cannot be rectified. Conditions such as high

temperature, overloading and high oxygen content should be avoided.

B and C Increase of > 0,05 and DP < 250

Colour and appearance O and A Not clear and free of visible contamination

Resample and identify any trend. Recondition oil by means of

regeneration if IFT, acid and sludge also deteriorate.

B and C

F

Dielectric dissipation factor at 90 °C, 40 Hz to 60 Hz

O and A > 0,1 Resample and identify any trend. Recondition oil by means of

regeneration. B and C > 0,2

Sediment and sludge O and A Sediment of perceptible sludge

present

Resample and identify any trend. Recondition oil by means of

regeneration if IFT, colour and acid also deteriorate. B and C Sediment or

perceptible sludge present

Interfacial tension, mN/m at 25 °C

O and A < 22 Resample and identify any trend. Recondition oil by means of

regeneration if acid, colour and sludge also deteriorate.

B and C < 22


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1 2 3 4

Analysis Class Recommended

action limits Recommended action

Particle contamination per 100 ml

O and A Particle size > 5 µm: 32 000

Particle size > 15 µm: 4 000

or ISO 15/12

Recondition oil by means of filtration.

B and C Particle size > 5 µm: 130 000

Particle size > 15 µm: 16 000

or ISO 17/14

Polychlorinated biphenyl, mg/kg or ppm

All > 50b Dispose of or if an approved

process exists then decontaminate and regenerate during repair, and

reuse in same equipment. Reclassify after 3 months.

NOTE Classes D, E, G and H will only be tested on inception and after repair; no intrusive testing will be performed.

a Depending on application class B equipment may be included

b See the latest national legislation.


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5.3 Frequency of evaluation of oil in service

5.3.1 Oil in service is subjected to various conditions, ranging from copious amounts of oxygen in free-breathing equipment, to very high temperatures in heavily loaded equipment, moisture produced by the deterioration of the oil and the presence of cellulose, and possible leaks etc. All these conditions will affect the properties of the oil, rendering regular in-service condition assessment and monitoring of the oil imperative.

5.3.2 Insulating oil analyses or tests can be classified as follows

5.3.2..1 Characterization – This gives parameters that can be used to identify the oil; 5.3.2..2 Determination of the ageing status – which gives parameters relevant to the ageing

process; 5.3.2..3 Determination of the dielectric status – which gives parameters used to determine

the dielectric safety margin and dielectric characteristics of the insulation spaces; and

5.3.2..4 Determination of the degradation status – This gives parameters relevant to faults, failure and wear in the equipment.

5.3.3 The classification of various analyses relating to the type of information gained from them is shown in table 10.

Table 10 — Classification of various analyses

1 2 3 4

Characterization Ageing status Dielectric status Degradation status

Fluid composition Free radicals Water content DGA

Carbon types Visible spectrum Percentage saturation Extended DGA

Specific gravity Acidity Bound water Furanic compounds

Viscosity Saponification number Particle profile Phenols

Refractive index Inhibitor contents Breakdown voltage Cresols

Permittivity IFT Impulse strength Dissolved metals

PAH content IR spectroscopy Charging tendency Particle profile

Inhibitor content Dissipation factor Resistivity

Total sulphur Resistivity Dissipation factor

Corrosive sulphur Polarization index Insoluble sludge

PCB content Turbidity Gas tendency

BTA content Insoluble sludge PD intention voltage

Sludge content

Oxidation stability

Furanic compounds


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5.3.4 The results shall be interpreted by accredited personnel. The interpretation should be based on best practices for evaluation of trends, characteristic values for specific types of equipment and oil. Results of typically normal, fair or poor analysis results for a specific rating of specific equipment can clarify certain analysis.

5.3.5 The analyses should be performed to assist with risk minimization and management, as well as life cycle analysis. In order to prevent total loss of large or strategic equipment, an ideal situation would be to do continuous condition monitoring of the equipment by means of on-line monitoring. However, this is a concept that is at its infancy stage, is limited to certain analyses, and is still very costly where it does exist. The frequency of analyses is thus dependent on equipment type, strategic nature, voltage, construction and service conditions.

5.3.6 The frequency of testing should increase if certain analyses indicate degradation of the insulation due to reasons such as overloading or faults.

5.4 Packaging and bulk deliveries

5.4.1 It is recommended that oil supplied in drums (210 litres) is supplied in drums as per the suggested colours found in the individual supplier’s insulating oil drum labelling, identification and storage document. The bulk containerization is controlled largely by the current road regulations and need to be adhered to. See SANS 10229.

5.4.2 The oil supplier shall guarantee that the oil delivered complies with the “zero count PCB” requirement. This guarantee shall be in the form of a certificate and records thereof shall be kept for auditing purposes. The certificate shall be kept for 30 years.

5.4.3 The oil supplier shall guarantee that, at the point of loading into dedicated supplier/ tankers, the oil conforms to the requirements of “new oil” or “regenerated oil” as defined in tables 5 and 6 for new oil and table 9 and 10 for regenerated oil. This guarantee shall be in the form of a certificate, of which a copy shall accompany the delivery note. Records thereof shall be kept for auditing purposes.

5.4.4 On delivery to site, and before transfer to another container (i.e. drums, bags, units, etc.), the oil shall be tested for DS. The minimum DS shall be 60 kV / 2, 5 mm gap. This sample shall be taken at the physical point of delivery, i.e. the end of the tanker supply hose.

5.4.5 Drums are sealed at the point of loading by the supplier and site testing on delivery is therefore not necessary. However, oil in drums shall be tested before use. The minimum DS shall be 60 kV / 2, 5 mm gap.

5.4.6 Transportation and storage: Drums shall be positioned either with the two bungs in a horizontal line position or upside down i.e. bungs down. As shown in Figure 5-2 below.

5.5 Storage of oil

5.5.1 Small drums (20 litres) shall always be stored indoors and the oil tested and used immediately after unsealing. Large drums (210 litres) shall be stored as shown in Figure 5 -2 below, ensuring that there is a head of oil above the bungs to prevent the entry of water. The seals shall be removed under cover, and the oil tested immediately and, if possible, used on the completion of the tests. The prolonged storage of breached drums shall be avoided.

5.5.2 Where possible, the drums shall be stored on a raised surface so that when it rains, the rainwater will not dam up against the drum: this will lead to rusting and then leaking of oil from the drum. Usually, wooden strips 100 mm x 20 mm laid end to end on the ground provide a very good means of protection against this. The wooden strips are commonly known as dunnage.

5.5.3 Tanks for bulk storage shall be completely sealed with properly fitted and maintained dehydrating breathers. If possible, all valves and communicating pipelines shall be protected from the weather and particularly from driving rain.

5.5.4 Stationary tanks, oil bags or drums dedicated to insulating oil only, shall be used for oil storage. Oil drums shall be stored in accordance with the procedure in figure 5 - 1 and figure 5 - 2.

5.5.5 Oil containers contaminated with dirty oil shall not be used for new oil or refined oil, unless such containers are first properly cleaned.


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5.5.6 Only batch regeneration is acceptable. The oil shall be re-refined batch-wise to comply in all respects with SANS 555 and be tested to the requirements of SANS 555 table 1, with the exception that prior to use, the oil shall comply with the DS and WC requirements of this document. Certification of compliance shall be kept on each batch of oil regenerated for audit purposes.

5.5.7 The DS test shall be performed in accordance with IEC 60156.

5.5.8 All oil supplied to site shall be pre-processed to be degassed and shall have a minimum DS of 70 kV / 2, 5 mm gap and a maximum WC of 10 mg/kg, with acidity (A) of not more than 0, 03 mg KOH/g.

5.5.9 Drums with used switchgear oil shall be marked as such to ease identification and classification when returned for re-generation;

5.5.10 Used switchgear oil and used transformer oil shall be stored in different containers;

5.5.11 If switchgear oil is mixed with transformer oil, the container shall be marked “switchgear oil”.

5.5.12 Used oil shall be scrapped if deemed necessary.

Figure 5-1 – Incorrect storage of drums


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Figure 5-2 – Horizontal storage position

5.6 Polychlorinated Biphenyl (PCB) contamination

5.6.1 Oil samples requiring testing for PCB contamination shall be carried out by the approved service provider.

5.6.2 All oil in bulk storage tanks, particularly at workshops, which is intended for re-use in equipment, independent of voltage rating, shall be tested for PCB contamination to avoid the spreading thereof. All oil submitted for reprocessing or regeneration shall also be tested for PCB contamination, unless relevant certification, which has been verified, is available.

5.6.3 All virgin oil purchased shall have a “zero count PCB” certificate, and records thereof shall be kept.

5.6.4 PCB contaminated oil shall be stored separately in containers which are clearly marked and to be disposed of by an approved method.

5.7 Oil for filling and topping units

5.7.1 Only “new oil” shall be used for the first filling of new units or units where all the insulation has been replaced with new insulation. Oil filling shall only be done by or under the supervision of specialists. The manufacturer’s filling procedure and specifications shall be followed

5.7.2 Caution: Topping-up refers to the action of correcting the oil level in a conservator tank. If the oil is below the Buchholz level, the filling procedure shall apply.

5.7.3 Only new or regenerated oil supplied in tankers or drums shall be used for topping up.

5.8 Oil tests and limits for new and repaired units

5.8.1 Caution: Where the test limits for oil are specified by the manufacturer are more stringent than those specified below, the manufacturer’s test limits shall apply. This shall be applicable to units of all voltage ratings.

5.8.2 The following routine oil tests shall be carried out in accordance with procedures as set down by the Chief Technical Officer of City Power’s oil laboratory.

5.8.2.1 Dielectric Strength (DS); 5.8.2.2 Dissolved Gas Analysis (DGA); 5.8.2.3 Acidity (A); and 5.8.2.4 Water Content (WC)


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5.8.3 The oil to be used shall comply with the requirements of 4.1.1.1 before filling the unit.

5.8.4 Units on outage for less than 1 month may be re-energized without an oil sample taken.

5.8.5 For units on outage for longer than 1 month, an oil sample shall be required. The unit shall only be re-energized if the sample analysis results are satisfactory.

5.8.6 Caution: The maximum test voltage of old versions of oil test equipment is 60 kV. This equipment may be used provided the 60 kV test level is held for at least 1 min.

5.8.7 Topping-up oil shall have a dielectric strength of not less than 60 kV / 2, 5 mm gap.

5.8.8 Test limits for oil in on-load tap changer diverter switch after maintenance and before commissioning:

5.8.8.1 DS not lower than 60 kV / 2,5 mm gap; 5.8.8.2 WC not more than 10 mg / kg.

5.8.9 Oil to be used in switchgear shall be:

5.8.9.1. Re-generated or virgin oil (virgin oil shall only be used when regenerated oil is not available);

5.8.9.2. Certified at source (minimum 70 kV / 2.5mm and maximum 10 mg / kg. 5.8.9.3. DS tested on-site before and after filling the switchgear: the DS shall, as a minimum,

be 60 kV / 2, 5 mm gap in the switchgear before energizing. 5.8.9.4. The oil shall be classified as non-PCB (i.e.: less than 45 mg/kg PCB count).

5.8.10 In-service oil of switchgears:

5.8.10.1. No routine oil sampling is necessary; 5.8.10.2. Oil shall be changed in accordance with normal maintenance intervals accepted for

switchgear.

5.9 Responsibilities

5.9.1 Support Services (Oil lab) shall maintain and safeguard an electronic database accessible through City Power’s computer network. This information is considered to be a long-term asset to City Power.

5.9.2 Copies of all oil test results and reports produced by other approved oil testing facilities shall be incorporated in the central database and recommendations shall be verified.

5.9.3 Support Services (Oil lab) shall be responsible for:

5.9.3.1. Taking oil samples from the plant at the frequencies required by this standard, or as recommended by the Chief Technical Officer or a Substation owner. These shall be carried out in accordance with the procedure stated in CP_TSSPEC_155 Oil sampling and analysis specification.

5.9.3.2. Delivering oil samples for analysis to an approved laboratory; 5.9.3.3. All oils received shall be sent to Support Services for handling and storage; 5.9.3.4. Ensuring that equipment containing PCBs is clearly marked and managed in an

approved manner; 5.9.3.5. Ensuring that only approved oil is used. 5.9.3.6. Nominating the departmental representative(s) to whom oil test results shall be

directed; 5.9.3.7. Monitoring trending oil sample results and recommendations, including taking the

recommended action timeously; and 5.9.3.8. Maintaining all relevant records.

5.9.4 The Chief Technical Officer at Support Services (Oil lab) shall be responsible for:

5.9.4.1. The timely analysis of oil samples received and recommendations of action in consultation with other specialists;

5.9.4.2. Informing the appropriate department timeously of the results of the oil test analysis, and giving recommendations;

5.9.4.3. Maintaining, updating and safeguarding an oil test results database system, which shall be made available to other departments when required;

5.9.4.4. Keeping abreast of the latest developments in oil technology through research; and updated methodology.


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6. QUALITY ASSURANCE

A quality management system shall be set up in order to assure the quality of the mineral insulating oil during design, development, production, installation and servicing. Guidance on the requirements for a quality management system may be found in the following standards: SANS ISO 9000, SANS ISO 9001, and SANS ISO 9004. The details shall be subject to agreement between the purchaser and supplier.

7. ENVIRONMENTAL MANAGEMENT

An environmental management system shall be set up in order to assure the environmental compliance of the mineral insulating oil throughout its entire life cycle (i.e. during design, development, production, installation, operation and maintenance, decommissioning and disposal phases). Guidance on the requirements for an environmental management system may be found in SANS ISO 14001 and City Power Policy. The details shall be subject to agreement between the purchaser and supplier.


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REVISION INFORMATION

DATE REV. NO. NOTES

October 2003

April 2013

0

1

First issue

Title change

Addition of headings

4.1 - 4.5

Addition of headings

5.1 – 5.9

Removal of Annexure

A - H

Documents

CITY POWER JOHANNESBURG (SOC) LTD ADVERTISEMENT WITH SPEC.pdf · CONTACT PERSON: Masego Moiloa RFQ DOCUMENTS WILL BE AVAILABLE ON SITE AND ON THE WEBSITE AS FROM 03 DECEMBER 2019