SPECIFICATION NTS-36 FOR MEDIUM VOLTAGE … › Suppliers › kica › NTS-36__6_April 2018.pdffollowing equipment: Medium Voltage Distribution Type Indoor Surge Arresters (S.A.) for

Israel Electric Corporation Ltd.

Marketing Division

National Network Unit

Specification NTS-36

For

Medium Voltage

Distribution Type Indoor Surge Arresters

For SF6 Switchgear

Edition No.: 6

Issued date: April 2018

Page No. 1 of 34

SPECIFICATION NTS-36

FOR MEDIUM VOLTAGE

DISTRIBUTION TYPE INDOOR SURGE ARRESTERS

FOR SF6 SWITCHGEAR


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Edition No.: 6


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SPECIFICATION NTS-36

FOR MEDIUM VOLTAGE

DISTRIBUTION TYPE INDOOR SURGE ARRESTERS

FOR SF6 SWITCHGEAR


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For

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Edition No.: 6


Page No. 3 of 34

Table of Contents:

Clause no. Clause description Page No.

1. Purchaser 4

2. Name of item & project 4

3. Location of item & project 4

4. Scope of work 4

5. Terminal points & terminal connection 5

6. Cyber & information security 5

7. Quality assurance & quality control 5

8. Standards & codes 6

9. Technical documentation 6

10. Data and technical requirements 10

11. Tests & inspections 15

12. Packaging & delivery 18

13. Storage & handling 18

14. Nameplate/marking 18

15. Notes 18

16. Special requirements 18

17. Revisions 18

18. Summary of data of Surge Arresters 19

19. Conformity with proposal documents 27

Appendix "A" Declaration regarding type tests 28

Appendix "B" Required schedules for prototype approval of surge

arresters for SF6 switchgears

29

Appendix "C" Parameters for Technical Evaluation for Bidders which

have fulfilled the requirements of Specification NTS-36

33


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Page No. 4 of 34

1 PURCHASER

The Israel Electric Corporation Limited (I.E.Co.).

2 NAME OF ITEM & PROJECT

This specification covers technical requirements for

MEDIUM VOLTAGE DISTRIBUTION TYPE

INDOOR SURGE ARRESTERS (S.A.)

FOR SF6 SWITCHGEAR

3 LOCATION OF ITEM & PROJECT

The surge arresters will be installed on I.E.Co 12.6kV, 22kV and 33kV distribution systems, for the

protection of SF6 switchgear equipment in indoor transformers stations.

4 SCOPE OF WORK

Design, develop, manufacture, test, preserve, pack and furnish (with export packing if applicable) of the

following equipment: Medium Voltage Distribution Type Indoor Surge Arresters (S.A.) for SF6

switchgear.

4.1 PROJECT DESCRIPTION

Lightning protection of equipment installed in I.E.Co. Medium voltage power lines.

4.2 SCOPE OF SUPPLY

Furnish and deliver fully tested, Surge Arresters for SF6 switchgears in Medium voltage power

lines.

Surge Arresters shall be for indoor use with all required installation accessories.

4.3 SCOPE OF SERVICE

N/A

4.4 CRITERIA FOR FINAL TECHNICAL COMPARISON OF BIDDER'S OFFERS

Parameters for Technical Evaluation for Bidders which have fulfilled the requirements of

Specification NTS-36 enclosed for your knowledge in Appendix "C".


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5 TERMINAL POINTS & TERMINAL CONNECTION

N/A

6 CYBER&INFORMATION SECURITY

N/A

7 QUALITY ASSURANCE & QUALITY CONTROL (S.A Manufacturer)

7.1 QUALITY ASSURANCE

7.1.1 The Manufacturer of the S.A shall have a Quality Management System (QMS)

certified to ISO 9001 requirements, with the following scope of certification:

design and production of the relevant equipment.

7.1.2 The Manufacturer’s main suppliers shall also have a Quality Management

System (QMS) certified to ISO 9001 requirements, with scope of certification

corresponding to the scope of supply indicated in the Manufacturer’s order and

the requirements of this specification.

7.1.3 ISO 9001 certification requirements – certificate, demonstrating compliance

with the above mentioned requirements, respectively, granted each by a

Certification Body (CB) which is a part of or belong to an International

Certification Network of CB's, should be submitted to Purchaser with the

proposal.

The CB should be accredited by an Accreditation Body which is a member of

the International Accreditation Forum Multilateral Arrangement (IAF MLA).

The certificate should bare the marks of: the CB, the above indicated

Certification Network of CB's and of its Accreditation Body.

7.2 QUALITY CONTROL

The quality control measures applied during the production of the S.A. shall conform to the

requirements specified in Apendix I of the Specification NPS-364.

Representatives of the Israel Electrical Corporation shall be authorized to visit the Manufacturer's

plant, witness tests and obtain full details of each phase of the transformer's production.

After product approval by the contractor’s personnel, the purchaser quality control

representative will inspect a sample according to International Standard ISO 2859 – 1

“sampling procedures for inspection by attributes”. Inspection level II, acceptance number 0

and rejection number 1.


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8 STANDARDS & CODES

8.1 Unless otherwise stated, the surge arresters shall be designed, manufactured and tested in

accordance with the requirements of the following standard:

IEC Standard 60099-4 June 2014

Surge arresters – Part 4:

Metal-oxide surge arresters without

gaps for a.c. systems

8.2 Standards referred to in this Specification and in Supplements to this Specification are integral

parts of this specification unless explicitly stated otherwise.

8.3 The equipment, including all appurtenances and accessories, shall be fabricated, inspected, tested

and preserved in compliance with the Standards as specified herein, unless otherwise indicated.

8.4 In the event that no reference to Standard is made herein, all components and parts shall be

fabricated, inspected, tested and preserved, so as to ensure their fitness for designed use and

purpose.

8.5 If the present Specification contains requirements which differ from those of the above mentioned

Standards, the requirements of this Specification shall take precedence.

9 TECHNICAL DOCUMENTATION

9.1 GENERAL

Bidders shall submit their technical offers in the following way:

- Contents of the offer shall be given at the beginning of the offer.

- Each chapter shall be separated from the others by divider page.

- Each proposed item shall be presented in a separate chapter which includes all the

technical data (drawings, routine/sample/type test report, summary of data, etc.)

- All the mentioned documents shall be in English or Hebrew.

- The I.E.Co. reserves the right, at its discretion, to allow a Bidder to complete such

proposal and to submit such documents at a later date, as prescribed by I.E.Co


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9.2 TECHNICAL DOCUMENTS AND SAMPLES TO ACCOMPANY THE PROPOSAL

The Bidder shall submit together with his offer the following documents:

9.2.1 Type test reports for identical surge arresters (indoor S.A. for SF6 switchgear) to those

proposed in the Proposal, including test circuit, instruments used, test sequence and description

of method.

9.2.2 Filled-in and signed type tests declaration – Appendix "A".

In case that some type tests reports are missing and/or unapproved the Bidder shall submit with his

offer a written guarantee (Appendix "A") to perform (in case of award), at his own expense and

responsibility, those type tests and submit to the Purchaser the tests reports, in English, for

approval, one month before first shipment of the ordered surge arresters as described in clause 11.

9.2.3 Routine tests for identical surge arresters to those proposed in the Proposal.

9.2.4 Completed and filled- in questionnaire signed by the Bidder (and Manufacturer)

(Summary of data - clause 18 below) for each proposed type of the surge arresters.

9.2.5 Filled-in and signed required schedules for prototype approval – Appendix "B".

9.2.6 Technical catalogue of the proposed surge arresters.

9.2.7 Quality Requirements documents.

9.2.8 General outline drawing with dimensions, materials, coating, weight, etc.

9.2.9 Description and schematic drawing of complete arrester.

9.2.10 Description of the principles of operation of the arrester under various operating conditions.

9.2.11 Drawing of cross section of arrester.

9.2.12 Drawings of housing, insulating bracket and disconnecting device.

9.2.13 Drawing of line and earth terminals.

9.2.14 Drawing of nameplate.

9.2.15 Mounting instructions.

9.2.16 Operating instructions and safety rules.


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9.2.17 Preliminary inspection and test plan to be performed by the manufacturer.

9.2.18 Maintenance instructions (including frequency, procedure and materials required of surge

arresters).

9.2.19 Shipping assembly drawings with overall size and weight.

9.2.20 Manufacturer's requirements for prolonged storage (2-3 years) before erection, taking into

account the specific conditions under clause 10.1.

9.2.21 Remarks:

9.2.21.1 All descriptive material shall be in English.

9.2.21.2 The Israel Electric Corporation (I.E.Co.) reserves the right, at its discretion, to allow a

Bidder to complete such proposal and to submit such documents at a later date, as

prescribed by I.E.Co.

9.3 TECHNICAL DOCUMENTS AND SAMPLES AFTER NOTIFICATION OF AWARD

9.3.1 After notification of award, the successful Supplier (henceforth referred to as "the Contractor")

shall submit, within 14 days after starting date (see Appendix "B") to the Purchaser for

approval, the following information:

9.3.1.1 Outline drawing of surge arrester, including all necessary details for mounting

such as fixing holes, size and material of primary and earthing terminals,

weight, permissible static and dynamic forces.

9.3.1.2 Line and earth terminals details (material, shape, cross - section).

9.3.1.3 Description and drawing of insulator from insulator Manufacturer.

9.3.1.4 Nameplate drawing with all data filled-in.

9.3.1.5 Bill of materials:

9.3.1.5.1 Instructions manuals, technical directives, drawings and any other relevant descriptive

materials which shall contain all information required for the mounting, commissioning,

operation, maintenance, periodic checking, periodic testing of the arresters.

9.3.1.5.2 In addition the Manufacturer shall supply a guide for installation, which shall include

the protection zone of the arresters for transformers, cable box, etc.


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9.3.2 Manufacturer shall supply any additional information considered necessary for clarifying

various aspects of operation, maintenance, etc.

9.3.3 Purchaser reserves the right to require all necessary additional drawings, etc. that may

contribute in completing information supplied by Manufacturer about the

surge arresters.

9.3.4 The drawings shall enable easy identification of all assemblies and parts of the arresters.

9.3.5 In any case, the Contractor shall not manufacture the ordered surge arrestors before receiving

I.E.Co.'s final approval of the prototype. Production of the ordered S.A before receiving

I.E.Co.'s final approval of the prototype will be at Contractor's own responsibility.

9.3.6 After I.E.Co.'s final approval of the prototype and after production of the ordered S.A, but

before delivery of the surge arrestors, the Contractor shall submit to I.E.Co., in English, routine

tests reports performed according to relevant Standard.

9.3.7 All data, reports, drawings and descriptive material shall be in English or in Hebrew. Any

submitted data, drawing or descriptive material not written in English or in Hebrew will not be

accepted. All dimensions shall be stated in the metric system.

9.4 SCHEDULE UP TO DELIVERY APPROVAL

Please see APPENDIX "B" - Required schedule for prototype approval of surge arresters.

9.5 DELIVERY APPROVAL

The Contractor shall submit to the Purchaser the Routine Test reports for approval 30 days prior to

each delivery of the equipment. The equipment shall be delivered only after approval of the routine

test report of each unit. The Contractor shall submit to the Purchaser the Acceptance Tests Reports

for approval 4 weeks prior to the first delivery of the equipment.


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10 DATA AND TECHNICAL REQUIREMENTS

10.1 ENVIROMENTAL CONSIDERATIONS & SERVICE CONDITION

The service conditions shall be in general according to clause 12.5.4 of IEC Standard 60099-4, with the

following additions and changes.

The equipment shall be suitable for outdoor mounting, in the following environmental conditions:

• Severe atmospheric and industrial air pollution, coal dust, sea salt spray.

• High atmospheric humidity as experienced in coastal or desert areas.

• Ambient air temperature in the general vicinity of dead-front arresters shall be between–40 °C

and +65 °C

• The maximum temperature of dead-front arresters due to self-heating and external heat

sources in the general vicinity of the arrester shall not exceed +85 °C

• Annual mean air temperature: +25°C

• Maximum relative humidity: 90%

• Average relative humidity: 70%

• Average ambient temperature measured over a period of 24 hours does not exceed +35°C

• Maximum difference of ambient temperature from day to night: +25°C

• Altitude: up to 1000m

Remark: Some of the Equipment may be installed at altitudes greater than 1000 m above sea level

(maximum 2000m) and at altitudes under sea level (minimum – 400m). The Bidder shall

specify the required operations to be performed in order to install the Equipment in the

above altitudes for proper operation.


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10.1.1 SYSTEM DATA

The equipment will be installed on Israel Electric Corp. Medium Voltage systems with the

following system data:

* (might be occasionally solidly grounded for short periods of time)

10.1.2 Rated system voltage....(kV) 12.6 22 33

10.1.3 Highest system voltage..(kV) 13.8 24 36

10.1.4 Frequency......................(Hz) 50 50 50

10.1.5 System of neutral earthing

Solidly or

via

Resistance

via Petersen

coil* or via

Grounding

Transformer

or solidly

Solidly or

via Petersen

coil*

10.1.6 Maximum duration of earth

fault............................(sec) 10 7200 7200

10.1.7 Maximum phase to ground

voltage in case of earth

fault..................(kV r.m.s)

14.7 24 36

10.1.8 Insulation level of equipment

to be protected:

a) Basic Insulation Level -

BIL (1.2/50 µsec)

……..……….(kV peak)

b) One minute withstand

voltage (50Hz).(kV r.m.s)

95

38

125

50

170

70

10.1.9 Maximum short-circuit

current of the system

…………………(kA r.m.s)

16

12.5

8


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10.2 RELIABILITY, AVAILABILITY, MAINTAINABILITY

N/A.

10.3 FUNCTIONAL REQUIREMENTS

General Requirements for surge arresters

10.3.1 The surge arresters will be installed on I.E.Co 12.6kV, 22kV and 33kV distribution systems, for the

protection of SF6 switchgear equipment in indoor transformers stations.

10.3.2 The surge arresters shall be of metal-oxide type (without gaps), indoor,

single-phase, explosion - proof.

10.3.3 The surge arresters shall be connected between phase and earth.

10.3.4 The arresters shall be suitable for connection to the Separable T Connector System for SF6

Insulated Switchgear. The above Separable T Connector System shall be manufactured in

compliance with the requirements of I.E.Co Specification NPS-364.

10.4 DESIGN & CONSTRUCTION

Electrical Requirements for the Equipment:

10.4.1 The arresters rated voltage (Ur) shall be chosen by Manufacturer in order to meet the system

data given in clause 10.1.1 above.

10.4.2 The Continuous Operating Voltage - COV - shall be chosen by the Manufacturer

in order to meet the system data given in clause 10.1.1 above and shall be specified in

Summary of data.

10.4.3 Temporary Overvoltage - TOV - curves in per unit of COV as a function of time or equivalent

curve of power frequency voltage versus time shall be given by Manufacturer with the proposal.

For arresters to be installed in 22kV and 33kV systems, the time of TOV curve should be

extended to 24 hr.


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10.4.4 TOV value shall be at least:

• 14.7 kV for 10 sec - 12.6 kV system.

• 24 kV for 7200 sec – 22 kV system.

• 36 kV for 7200 sec – 33 kV system.

10.4.5 Nominal discharge current shall be at least 5 kA peak.

10.4.6 Maximum residual voltage at 8/20 µsec and at 5kA peak discharge current

shall be not more than:

• 42kV peak for 12.6kV system.

• 85kV peak for 22 kV system.

• 118kV peak for 33 kV system.

10.4.7 Rated frequency - 50Hz

10.4.8 Arresters short circuit rating shall be at least:

- 16kA r.m.s. (at least 0.2sec) for 12.6 kV and for 22 kV networks

- 10kA r.m.s. (at least 0.2sec) for 33 kV network.

10.4.9 The surge arresters shall be of DM class as per clause 4.2 of IEC 60099-4.

10.4.10 Repetitive charge transfer rating (Qrs) shall be chosen at least 0.5C.

10.4.11 The high-current impulse withstand tests shall consist of the application to each arrester sample

of two 4/10 µsec current impulses with peak values of 65 kA peak.

10.4.12 Thermal charge transfer rating (Qth) shall be at least 0.7 C as per table 5 of the IEC 60099-4 for

distribution arresters.

10.4.13 The arrester housing shall withstand voltages summarized in the following table.

Rated

System

Line to Line

Voltage, Un

(KV)

Highest System

Line to Line

Voltage, Um

(KV)

Basic Insulation

Level

BIL (1.2/50µs)

(KV peak)

One Minute Withstand

Voltage (r.m.s.)

at frequency of 50Hz

(KV r.m.s.)

12.6

22

33

13.8

24

36

95

125

170

38

50

70


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10.4.14 The internal partial discharges in the metal-oxide arresters energized at 1.05 times its

continuous operating voltage shall be less than 10pC (see clause 9.1(d) of IEC 60099-4

Standard).

10.5 INTERCHANGEABILITY

Surge Arresters of the same factory and the same rating shall be interchangeable with each other,

both electrically and mechanically, and when so inter-changed shall perform their function equally

well in every respect.

10.6 COMMISSIONING

The Supplier shall submit requirements for commissioning of the S.A. if applicable.

10.7 OPERATION & MAINTENANCE

10.7.1 General

10.7.1.1 The Contractor shall submit Installation instructions for approval.

10.7.1.2 The Contractor shall submit Maintenance instructions (including

frequency, procedure and materials if required).

10.8 SAFETY

The Bidder shall submit Safety instructions for the equipment.

10.9 TRAINING

N/A

10.10 CONFIGURATION MANAGEMENT

N/A

10.11 ERGONOMICS, HUMAN ENGINEERING

N/A

10.12 METHODS

N/A


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10.13 MAINTENANCE

10.13.1 The offered surge arresters shall be a maintenance free type. If the Contractor requires or

recommends maintenance for the offered surge arresters the offer will be rejected.

11 TESTS & INSPECTIONS

11.1 Type Tests of surge arresters

The type tests shall be performed in accordance with the Standard IEC 60099-4. The type test

reports shall be submitted to the Israel Electric Corp. together with Bidder's technical

proposal. Each test shall be performed with the values declared by the manufacturer in the

technical stage of the tender.

11.2 Type Test Reports

• The submitted type test reports shall be of the S.A. identical to the proposed S.A.

• The type test reports shall state according to which standard the tests were performed. The type

test reports shall specify the conditions of the test and the actual values received during the tests.

It shall state the names and have the signatures of those who performed the type tests, those who

approved the type tests reports and those who witness the type tests.

• I.E.Co. reserves the right of not requiring type tests reports in case of tender

for a small amount of Separable T Connector Systems with surge arresters for SF6 switchgear.

• The type test reports shall contain a detailed drawing of the tested equipment, photos of the

equipment before and after the test.

• The following type test reports shall be submitted (the clauses refer to above Standard except

clause 10.4.13 which refers to this Specification):

- Insulation withstand tests on the arrester housing (clause 8.2, clause 12.8.2 of IEC 60099-4 and

clause10.4.13 of this Specification)

- Residual voltage tests (clause 8.3 of IEC 60099-4)

- Test to verify long term stability under continuous operating voltage (clause 8.4 and

clause 12.8.4 of IEC 60099-4)

- Test to verify repetitive charge transfer withstand (clause 8.5 of IEC 60099-4)

- Heat dissipation behaviour verification of test sample (clause 8.6 of IEC 60099-4)

- Operating duty test (clause 8.7 & 12.8.7 of IEC 60099-4)

- Power-frequency voltage versus time (clause 8.8 of IEC 60099-4)

- Short-circuit tests (clause 8.10 & 12.8.10 of IEC 60099-4)

- Test to verify the dielectric withstand of the internal components of an arrester

(clause 8.15 of IEC 60099-4)


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- Internal partial discharge test (clause 12.8.17 of IEC 60099-4)

- Test of internal grading components (clause 8.16 of IEC 60099-4)

I.E.Co reserves the right to allow the Supplier, after notification of award, to perform at his

expense the following type tests:

- type tests, of which reports were not approved by I.E.Co during technical stage of

the tender;

- type tests, of which reports were missing during technical stage of the tender,

This applies only to Bidders who signed a declaration (Appendix "A") regarding performance of

type tests as required in this Specification NTS-36.

The type tests will be performed during the time frame of the order and the reports will be

submitted to Purchaser, in English, at least one month before shipment of the ordered surge

arresters.

The Contractor shall perform those type tests in a well-known authorized laboratory (ISO/IEC

17025 or EN 45011 approved).

The Contractor shall submit to the National Network Unit, forty five (45) days before

performing those type tests, the name of laboratory and the plan of those type tests for I.E.Co

approval.

I.E.Co reserves the right to participate in those type tests. 11.3 Routine Tests

11.3.1 A routine test shall be performed by the Contractor for each equipment

11.3.2 Duly certified routine tests are obligatory. Such tests shall be performed at the Manufacturer’s

laboratory.

11.3.3 Each supplied S.A. shall be tested in the following routine tests in accordance with the Standard

IEC 60099-4:

11.3.3.1 Measurement of reference voltage (Uref). The measured values shall be within a range

specified by the manufacturer.

11.3.3.2 Residual voltage test.

11.3.3.3 Internal partial discharge test.


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11.3.4 Routine Test Report

• The routine test report shall state according to which standard and clause the test was performed.

• The Routine Test Report shall contain the S.A. type, the results of the tests, the required values

and the values obtained during the test.

The routine tests reports shall be submitted to Purchaser up to one month before delivery of each

batch of the offered surge arresters.

11.4 Acceptance Tests

The standard acceptance tests shall be performed on the proposed S.A. according to the

Standard IEC 60099-4.

The following acceptance tests shall be made on the nearest lower whole number to the cube root of

the number of arresters to be supplied.

The acceptance tests shall include:

a) Measurement of power-frequency voltage on the complete arrester at the reference current

measured at the bottom of the arrester. The measured values shall be within a range specified by

the manufacturer at the technical stage of the tender

(clause 9.2.1 a of the IEC 60099-4).

b) Surge impulse residual voltage on the complete arrester at the 5kA peak and nominal discharge

current. The residual voltage for the complete arrester shall not be higher than the value specified

by the manufacturer at the technical stage of the tender.

(clause 9.2.1 b of the IEC 60099-4).

c) Internal partial discharge test. The test shall be performed on the complete arrester. The test sample

may be shielded against external partial discharges. The measured value for the internal partial

discharge shall not exceed 10 pC. (clause 9.2.1 c of the IEC 60099-4).

e) Special thermal stability test according to IEC 60099-4 standard. The test shall be performed on

three totally different test sections consisting of metal-oxide resistors taken from current routine

production and having the same dimensions and characteristics as those of the arresters under test.

(clause 9.2.2 of the IEC 60099-4).

The test is passed if thermal stability occurs in all three samples.

The acceptance tests shall be performed after notification of award and after type test approval, but

before delivery of the first batch of the S.A. The test reports shall be submitted to I.E.Co four weeks

before delivery of the S.A. for I.E.Co approval.


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The Contractor shall submit to the National Network Unit, forty five (45) days before performing

those tests, the name of laboratory and the plan of those acceptance tests for I.E.Co approval.

I.E.Co reserves the right to participate in those tests.

12 PACKAGING & DELIVERY

The S.A shall be supplied as required in NPS-364 specification.

The equipment package for shipment shall be so designed and carried out as to prevent any damage to

equipment during shipment and during prolonged (2-3 years) storage under the climatic and

environmental conditions described under clause 10.1.

Special care for ensuring air, moisture and water tight packing for the equipment, shall be ensured for a

prolonged storage period (2-3 years) under the climatic conditions described in clause 10.1.

13 STORAGE & HANDLING

Manufacturer's shall supply requirements for prolonged storage (2-3 years) before erection, taking into

account the specific conditions under clause 10.1.

14 NAMEPLATE/MARKING

The nameplate shall be in accordance with IEC Standard 60099-4.

15 NOTES

N/A

16 SPECIAL REQUIREMENTS

N/A

17 REVISIONS

N/A


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18 SUMMARY OF DATA (to be filled separately for each type of surge arrester)

Name of Supplier

(Insert all data in this column)

Required

Offered

12.6 22 33

KV

18.1 - MANUFACTURER

18.1.1 Manufacturer's name and address.

18.1.2 Type No.

18.2 - WEIGHTS

18.2.1 Net weight of each Surge

Arrester......................................(kg)

18.3 - DIMENSIONS AND DRAWINGS

18.3.1 Overall height........................(mm)

18.3.2 Is outline drawing of the S.A.

housing attached

……………………………Yes/No) Yes Yes Yes

18.3.3 Is cross-section drawing attached?

........................................(Yes/No) Yes Yes Yes

18.3.4 Is nameplate drawing attached?

........................................(Yes/No) Yes Yes Yes

18.3.5 What is the number of metal-oxide

discs per S.A.?

18.3.6 What is the size of metal-oxide disc

(diameter/height)? .............. (mm)


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Name of Supplier


Required

Offered

12.6 22 33

KV

18.3.7 Who is the metal-oxide discs

Manufacturer?

18.3.8 Terminals:

18.3.8.1 Size of line side terminal

18.3.8.2 Material of line side terminal

18.3.8.3 Size of earthing side terminal

18.3.8.4 Material of earthing side terminal

18.3.8.6 Is terminals drawing attached?

…………………………..(Yes/No)

Yes

Yes

Yes

18.3.9 Minimum clearances for

correct operation:

18.3.9.1 To earthed metal................(mm)

18.3.9.2 Between phases-axis.........(mm)

18.4 - GENERAL DATA

18.4.1 Rated voltage........................(kV)

18.4.2 Continuous operating

voltage (COV)....................(kV)

18.4.3 Rated frequency.........(Hz) 50 50 50


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18 4.4 Nominal discharge current

...................................(kA peak) ≥ 5 ≥ 5 ≥ 5

18.4.5 Arrested classification

DM

class

DM

class

DM

class

18.4.6 Is the characteristic "Temporary

Over Voltage” (TOV) in per unit of

Continuous Operating Voltage

(COV) or an equivalent curve of

power frequency voltage versus

time, as required in clause 6.12 of

IEC 60099-4 Standard attached?

.....(Yes/No)

Yes

Yes

Yes

Is the TOV characteristic extended

for 24hr for arresters to be installed

in 22kV and 33kV system?

..........................................(Yes/No)

Yes

Yes

18.4.7 Maximum Temporary Over Voltage

which may be applied to the arrester

after the arrester has been subjected

to the conditions required in clause

6.12 of IEC 60099-4 Standard (with

Prior duty of S.A.):

• 10 sec.......................................(kV) 14.7≤

• 7200 sec...................................(kV) 24≤ 36≤


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18.4.8 Residual voltage test:

18.4.8.1 Maximum surge impulse

residual voltage (8/20 µsec), at the

following discharge current:

* 2.5kA peak............(kV peak)

* 5kA peak................(kV peak) 42≥ 85≥ 118≥

* 10kA peak.............(kV peak)

* 20kA peak.............(kV peak)

18. 4.8.2 Maximum steep current impulse

residual voltage (1 µsec virtual

front):

* at 5kA peak discharge current

..................................(kV peak)

* at 10kA peak discharge current

.................................(kV peak)


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18.4.9 Repetitive charge transfer rating

Qrs

At least

0.5C

At least

0.5C

At least

0.5C

18.4.10 High-current (4/10µsec) impulse

withstand test ..............(kA peak) 65 ≤ 65 ≤ 65 ≤

18.4.11 Rated short circuit of the S.A.

(at least 0.2sec)?......(kA r.m.s). 16 ≤ 16 ≤ 10 ≤

18.4.12 Arrester housing data:

18.4.12.1 Insulator manufacturer

18.4.12.2 Insulator material

18.4.12.3 Electrical strength of arrester

housing:

a) 50Hz, 1 min, wet,

withstand voltage

........................(kV r.m.s) 38 ≤ 50 ≤ 70 ≤

b) 1.2/50 µsec, dry,

withstand voltage

.......................(kV peak) 95 ≤ 125 ≤ 170 ≤


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18.4.15 Internal partial discharge test (see

clause 9.1 in IEC 60099-4

Standard):

18.4.15.1 Prestress voltage (2<t<10sec)

…..................................(kV) Vrated Vrated Vrated

18.4.15.2 Test voltage...................(kV) 1.05

COV

1.05

COV

1.05

COV

18.4.15.3 Partial discharge level.........(pC) 10 ≥ 10 ≥ 10 ≥

If so, is the test report attached?

............................................(Yes/No)

18.4.16 Reference voltage ………….(kV)

18.4.17 Reference current …………..(mA)

18.4.18 Thermal charge transfer rating (Qth)

At least

0.7C

At least

0.7C

At least

0.7C

18.5 - Do the proposed S.A. fit under

Purchaser's distribution system data

specified in clause 10.1.1

of the Specification?.......(Yes/No) Yes Yes Yes


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18.6 Do the proposed S.A. perform

satisfactorily under the special service

conditions as described in clause 10.1,

of the specification?.............(Yes/No) Yes Yes Yes

18.7 Please provide information on S.A.

sealing:

18.7.1 Materials for S.A. sealing

18.7.2 Method of sealing

18.7.3 Are the proposed S.A. completely

hermetically sealed for at least 10

years...........................(Yes/No)

Yes Yes Yes

18.8 Are identical S.A to those proposed

in the Proposal, already placed in

service by customers?.............(Yes/No)

If so, for how long?...................(Years)

18.9 What is the MTBF of the proposed

S.A?

18.10 Experience of Manufacturer with

identical S.A. in tropical and sub-

tropical countries (please provide

reports, proceedings, articles,

reference list etc.).

Is this material attached?....(Yes/No)


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18.11 Do the proposed S.A. comply with

IEC 60099-4 Standard?....(Yes/No) Yes Yes Yes

18.12 Other standards, norms,

recommendations, etc. used in the

design, manufacture and testing of

the proposed S.A.

18.13 Are Manufacturer's requirements for

storage before erection according

to the climatic conditions described

in clause 10.1 attached?

………………………...(Yes/No)

18.14 - Other manufacturer's data to be

submitted with proposal

18.14.1 Is a guide for installation as

required in clause 9.2.15, of this

Specification, attached?....(Yes/No)

Yes

Yes

Yes

18.14.2 Are drawings, technical data,

catalogues, instruction books, of the

proposed S.A. and their

accessories attached? ......(Yes/No) Yes Yes Yes

18.14.3 Is maintenance necessary? (please

give details).....................(Yes/No)

18.14.4 Recommended Number of months

between successive inspections

18.14.5 Expected man-hours required for

periodical inspection and

maintenance.....................(hours)


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18.14.6 Type Tests Reports for S.A.

identical to those proposed in

the Proposal (see clause 9.2.1 & 11,

of this Specification).

Are they attached to the

Proposal?......................(Yes/No)

Yes

Yes

Yes

18.14.7 Routine Tests Reports for identical

S.A. to those proposed in the

Proposal (see clause 9.2.3, of the

Specification)

Are they attached to the

Proposal?..................(Yes/No)

Yes

Yes

Yes

19 - CONFORMITY WITH PROPOSAL DOCUMENTS

Supplier hereby certifies that he agrees to all provisions of the Proposal Documents unless exceptions

are specifically and clearly listed in the proposal and identified as exceptions.

Supplier's printed terms and conditions are not considered specific exceptions. Any exceptions which

Supplier has taken are listed on Page .

Supplier hereby certifies that he agrees to all conditions of the Cover Letter of The Israel Electric Corporation

Limited which accompanied the Proposal Documents.

Signature of Supplier Date of Proposal


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APPENDIX "A"

Type Tests Declaration To be returned signed and stamped by Supplier

We hereby declare, that in case of award we will perform at our own responsibility, all missing

and/or unapproved type tests (on every awarded type and alternative) as required in paragraph 11.2 of

Specification NTS-36 and submit to the Purchaser the reports, in English, of these type tests at least one

month before shipment of the ordered surge arresters.

Name of Supplier:

Signature and stamp of Supplier:

Date:


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APPENDIX "B"

Required schedule for prototype approval of surge arresters


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Required schedule for prototype approval of surge arresters (in case type tests performance is required by I.E.Co)

I.E.C. Inquiry no.

Weeks

STAGE 1 2 3 4 5 6 7 8 9 10 11 12 13

1 Starting date (*)

2 Submission of drawings to I.E.Co. for approval

3 Drawings approval by I.E.Co. including

clarifications.

4 Submission of date, laboratory name and plan for

type tests (for I.E.Co approval)

5 Type tests performance

6 Submission of the type test reports for approval

7 Submission of date, laboratory name and plan for

acceptance tests (for I.E.Co approval)

8 Type tests report and prototype approval

Bidder name and title: Bidder signature

Date:

(*)- the date on which contractual obligation has been created between the parties, as specified in the invitation to submit proposals in the Tender/RFP.


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Required schedule for prototype approval of surge arresters (in case type tests performance is not required by I.E.Co)

I.E.C. Inquiry no.

Weeks

STAGE 1 2 3 4 5

1 Starting date (*)

2 Submission of drawings to I.E.Co. for approval

3 Drawings approval by I.E.Co. including

clarifications.

4 Submission of date, laboratory name and plan

for acceptance tests (for I.E.Co approval)

5 Prototype approval


Date:

(*)- the date on which contractual obligation has been created between the parties, as specified in the invitation to submit proposals in the Tender/RFP.


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Required schedule for acceptance tests approval of surge arresters

I.E.C. Inquiry no.

Weeks

STAGE 1 2

1 End of production of the first batch

2 Acceptance tests performance (of S.A. from first

batch)

3 Submission of the acceptance test reports for

approval

4 Final approval of the acceptance test reports


Date:


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APPENDIX "C"

CRITERIA FOR FINAL COMPARISON OF BIDDERS OFFERS

(which have fulfilled all tender requirements)


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Parameters for Technical Evaluation for Bidders which have fulfilled the requirements

of Specification NTS-36

No. Parameter Weight

in %

Paragraph

in

specification

remarks

1 Product quality 100

1.1 Continuous operating voltage (15) 10.4.2 See remark (1)

1.2 Repetitive charge transfer rating (Qrs) (15) 10.4.10 See remark (1)

1.4 Lightning impulse residual voltage (30) 10.4.6 See remark (2)

1.6 Short circuit withstand capability (30) 10.4.8 See remark (1)

1.7 Thermal charge transfer rating (Qth) (10) 10.4.12 See remark (1)

Remarks:

(1) Maximal grade shall be given to the offer which has the highest value, minimum grade shall be given to the offer

which has the lowest value, but has fulfilled the NTS-36 specification requirements.

(2) Maximal grade shall be given to the offer which has the lowest value, minimum grade shall be given to the offer

which has the highest value, but has fulfilled the NTS-36 specification requirements.

(3) Minimum grade of the technical evaluation of the proposal which fulfils I.E.C technical requirements will be 50.