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ABB Lummus Global B.V.SPECIFICATION

Client Indian Oil Corporation Limited (IOCL) Always refer to this number

Plant Naphta Cracker Unit 120.311 04184 N-601

Location Panipat, Haryana, India Dept./Sect. Project Specification

Doc. No. 04184-120311-000007 Rev. 0

Specification For:

GENERAL ELECTRICAL SPECIFICATION

N-601

LGV SSPE 04-3911-01.020 (1999-02-18) “” 04184-120311-000007 Page 1 of 30

0 2005-03-11 FOR FEED PACKAGE PCP POV HHI

A 2005-02-14 ISSUED FOR COMMENTS / APPROVAL PCP POV HHIREV. DATE DESCRIPTION PREPARED CHECKED APPROVED





Doc. No. 04184-120311-000007 Rev 0

INDEXSECTION PAGE

1. SCOPE 4

2. DEFINITIONS 4

3. RESPONSIBILITIES 4

4. REGULATIONS 5

4.1 NATIONAL CODES AND STANDARDS 5

4.2 IEC STANDARDS, OTHER INTERNATIONAL STANDARDS AND PUBLICATIONS 6

4.3 ELECTRICAL PROJECT ENGINEERING SPECIFICATIONS 8

5. DESIGN 9

5.1 GENERAL 95.1.1 Engineering criteria 95.1.2 Overview of the power distribution system. 95.1.3 System Voltages and Frequency 95.1.4 Voltage and Frequency Variations 105.1.5 Electrical Loads and Electricity Consumption 115.1.6 Shortcircuit Ratings 11

5.2 SERVICE CONDITIONS 12

5.3 ENCLOSURE DEGREE OF PROTECTION 12

5.4 ELECTRICAL AREA CLASSIFICATION 12

5.5 SUBSTATION 135.5.1 Location 135.5.2 Construction Requirements 135.5.3 Safety 14

5.6 ELECTRICAL INSTALLATIONS OF BUILDINGS 14

5.7 AC SWITCHGEAR AND CONTROL GEAR ASSEMBLIES. 15

5.8 TRANSFORMERS 16

5.9 EARTHING RESISTORS 16

LGV SSPE 04-3911-01.020 (1999-02-18) “” 04184-120311-000007 Page 2 of 31





Doc. No. 04184-120311-000007 Rev 0

INDEXSECTION PAGE

5.10 BUS DUCT 16

5.11 ELECTRIC MOTORS 17

5.12 PROTECTION AND CONTROL REQUIREMENTS 17

5.13 EMERGENCY SUPPLY SYSTEMS 17

5.14 ANNUNCIATORS 18

5.15 POWER INSTALLATION 18

5.16 EARTHING INSTALLATION 19

5.17 LIGHTING INSTALLATION 20

5.18 MAINTENANCE SOCKET OUTLETS 22

5.19 ELECTRIC TRACING 22

5.20 COMMUNICATION AND SECURITY SYSTEMS 22

5.21 CATHODIC PROTECTION 22

6. MATERIALS 23

7. TESTING AND COMMISSIONING 23

8. CORROSION PROTECTION 23

9. DOCUMENTATION 24

10. MARKING 24

11. REFERENCE DOCUMENTS 25

12. ATTACHMENTS 25

LGV SSPE 04-3911-01.020 (1999-02-18) “” 04184-120311-000007 Page 3 of 31





Doc. No. 04184-120311-000007 Rev. 0

1. SCOPE

This specification gives directives for design, selection criteria, methods, instructions and exam-ples for the electrical scope of work for a petrochemical plant.This specification, together with the applicable project specifications, shall govern the engineer-ing of the electrical facilities.The scope of this specification applies to the complete electrical installation which includes fol-lowing:

Detailed engineering and design. A complete package of installation drawings. Supply and installation of equipment and materials. Testing and commissioning.

2. DEFINITIONS

For this specification following definitions are applicable:

Client:

Indian Oil Corporation Limited (IOCL)

Contractor:

Contractor is the party which carries out all or part of the design, engineering, procure-ment, construction applicable to this specification.

Supplier:

Any manufacturer or supplier or seller who is appointed by the contractor and responsi-ble for the supply of materials or equipment or services.

3. RESPONSIBILITIES

3.1 All contact in connection with this specification shall be between Client and Contractor.

3.2 Any conflict between the requirements of this specification and the related codes, standards and/or project engineering specifications shall be referred to Client for clarification.In case of any conflict or deviations amongst the various referenced regulations and documents general the order of precedence shall be as follows: Country laws and regulations (statutory requirements) Project specifications and drawings IEC and internationally recognized standards Country standards

3.3 Assumptions to cover lack of information are not allowed. Contractor is obliged to obtain reliable information from Client or other sources.

3.4 Contractor shall fully describe all proposed deviations from this specification for review and ap-proval by Client.

3.5 Contractor shall verify all (existing) dimensions and conditions shown on Client's documents.





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4. REGULATIONS

The installation shall be designed, constructed, inspected and tested in accordance with the re-quirements of this specification and the edition of the statutory requirements, national standards and international standards as valid on the contract award date.

The IEC International standards shall be used to the maximum extent and usage of Indian stan-dards shall be limited to authority related designs (statutory requirements).Electrical equipment and materials manufacturing standards shall be in accordance with IEC standards, with the option for Indian manufacturers to offer equipment and materials manufac-tured to offer equipment and materials manufactured to equivalent Indian Standards (IS).

Certification of equipment and materials for duty, rating, environmental suitability, hazardous area use shall be obtained from recognised National or International testing authorities. Evi-dence of the appropriate certification shall be obtained prior to commitment to purchase.

Equipment of Indian origin selected for installation in hazardous areas shall have a test certifi-cate from the Central Mining Research Station (CMRS) and approval certificates from the Chief Controller of Explosives (CCE).

Contractor shall be responsible for obtaining necessary approvals from the statutory authorities e.g. Electrical inspectorate, CCE as applicable before commissioning of electrical facilities.

The main codes and standards, which shall be considered as minimum requirements, are given below.

4.1 NATIONAL CODES AND STANDARDS

Indian Electricity Act 1910.

Indian Electricity Rules 1956.

The Factory Act 1948.

The Petroleum Act 1934

The Petroleum Rules 1976 (Ministry of Industry, Government of India)

Indian Standards (IS) as listed below

IS 732 Code of practice for electrical wiring installations system voltages not ex-ceeding 650V

IS 1255 Code of Practice for installation and maintenance of power cables up to and including 33 kV rating

IS 1646 Code of practice for fire safety of buildings and electrical installations

IS 2309 Code of practice for the protection of buildings and allied structures against lightning

IS 3034 Code of practice for fire safety of industrial buildings - Electrical generating & distributing stations

IS 3043 Code of practice for earthing

IS 3646 Code of practice for interior illumination: Part I & Part II

IS 3716 Application guide for insulation co ordination





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IS 5571 Guide for selection of electrical equipment for hazardous areas

IS 5572 Classification of hazardous areas for electrical installations

IS 6665 Code of practice for Industrial lighting

IS 7098 Cross-linked polyethylene insulated PVC sheathed cables

IS 7689 Guide for control of undesirable static electricity.

IS 9676 Reference ambient temperature for electrical equipment

IS 10028 Code of practice for selection, installation and maintenance of trans-formers

IS 12360 Voltage bands for electrical installations including preferred voltages and frequency

IS 12459 Code of practice for fire protection of cable runs.

IS 13234 Guide for short circuit calculations

IS 13346 General requirements for electrical apparatus for explosive gas atmo-sphere

IS 13408 Code of practice for the selection, installation and maintenance of elec-trical apparatus for use in potentially explosive atmospheres.

Publications issued by the Oil Industry Safety Directorate (OISD) as listed below :

OISD 113 Classification of areas for electrical installation at hydrocarbon processing and handling facilities

OISD RP 147 Inspection and safe practices during electrical installations

OISD RP 149 Design aspects for safety in electrical system

OISD 173 Fire prevention and protection system for electrical installation

OISD GDN 180

Lightning protection

4.2 IEC STANDARDS, OTHER INTERNATIONAL STANDARDS AND PUBLICATIONS

This subsection only lists the most relevant IEC standards. The detailed project engineering specifications shall define the specific IEC standards to be used.

Standards issued by the International Electrotechnical Standards Committee(IEC) as lis-ted below :

IEC 60034 Rotating Electrical Machines

IEC 60038 IEC Standard Voltages.

IEC 60050 International Electrotechnical Vocabulary

IEC 60076 Power Transformers

IEC 60079 Electrical Apparatus for Explosive Gas Atmospheres.

IEC 60099 Surge Arrestors

IEC 60146 Semiconductor Converters





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IEC 60183 Guide to the Selection of High Voltage Cables

IEC 60204 Safety of Machinery. Electrical Equipment of Machines

IEC 60255 Electrical Relays.

IEC 60269 Low Voltage Fuses

IEC 60287 Electric Cables - Calculation of the Continuous Current Rating

IEC 60289 Reactors

IEC 60331 Test for Electrical Cables under Fire Conditions – Circuit Integrity

IEC 60332 Test on Electric Cables under Fire Conditions

IEC 60364 Electrical Installations of Buildings.

IEC 60439 Low Voltage Switchgear and Control Gear Assemblies

IEC 60470 High Voltage Alternating Current Contactors and Contactor-based Motor Starters

IEC 60478 Stabilised Power Supplies, DC Output

IEC 60502 Power Cables with Extruded Insulation and their Accessories for Rated Voltages from 1 kV (Um = 1.2 kV) up to 30 kV (Um = 36 kV)

IEC 60529 Degrees of Protection Provided by Enclosures (IP Code).

IEC 60621 Electrical Installations for Outdoor Sites under Heavy Conditions (includ-ing Open-cast Mines and Quarries

IEC 60694 Common Specifications for High Voltage Switchgear and Control Gear Standards

IEC 60896 Stationary Lead-Acid Batteries. General Requirements and Methods of Test.

IEC 60909 Short Circuit Current Calculations in Three Phase AC Systems.

IEC 60947 Low Voltage Switchgear and Control Gear

IEC 61000 Electromagnetic Compatibility.

IEC 61024 Protection of Structures against Lightning.

IEC 61082 Preparation of Documents used in Electrotechnology.

IEC 61140 Protection Against Electric Shock. Common Aspects for Installation and Equipment

IEC 61200 Electrical Installation Guide

IEC 61241 Electrical Apparatus for Use in the Presence of Dust

IEC 61312 Protection Against Lightning Electromagnetic Impulse

IEC 61800 Adjustable Speed Electrical Power Drive Systems

IEC 61936 Power Installations Exceeding 1 kV AC

IEC 62040 Uninterruptible Power Systems (UPS)

IEC 62271 High Voltage Switchgear and Control Gear





Doc. No. 04184-120311-000007 Rev. 0

Note: Parts of multipart IEC standards issued from 1997 will carry the 60000 series reference, while existing parts and related amendments will continue to carry old references.

Standards issued by the American Petroleum Institute (API) as listed below :

API RP 505 Recommended Practice for Classification of Locations for Electrical In-stallations at Petroleum Facilities, Classified as Class 1, Zone 0, Zone 1 and Zone 2.

4.3 ELECTRICAL PROJECT ENGINEERING SPECIFICATIONS

All electrical project engineering specifications shall be developed by Client.





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5. DESIGN

5.1 GENERAL

5.1.1 Engineering criteriaThe engineering of the electrical installation shall be based upon the following factors:

Safety to personnel and equipment during operation and maintenance. Reliability of service. Ease of maintenance. Facility for limited addition of future loads. Convenience of operation. Maximum standardization of equipment and materials. Maximum interchangeability of equipment. Elimination of fire risk. Suitability for applicable environmental factors

Safe conditions shall be ensured under all operating conditions including those associated with start up and shut down of plant as well as those arising out of failure of electrical equipment. The isolation of part of system of electrical equipment due to either maintenance or shut down shall not compromise safety.

5.1.2 Overview of the power distribution system.The Overall Single Line Diagram (04084-120311-000013) gives a general overview of the power distribution system and the related electrical installations.The power supply shall consist of a double grid connection at 33 kV. The connection shall be made by underground power feeders coming from the overall plant substation.The battery limit for the facilities shall be at the primary side of the 33 / 6.6 kV transformers at the Naphta Cracker Unit substation.The main power distribution inside the Naphta Cracker Unit shall be at 6.6 kV.Emergency loads shall be supplied by a dedicated LV emergency generator.UPS power, either AC or DC, shall as a minimum be provided for ESD, fire & gas, switchgear control, DCS, security systems, critical control systems and telecommunication systems.AC and DC UPS systems will be single type execution (100 % rectifier, 100 % battery for DC UPS systems; 100 % rectifier, 100 % battery, 100 % inverter and 100 % static bypass for AC UPS systems).Inside the instrument building a dedicated AC UPS for instrument systems shall be installed.

5.1.3 System Voltages and FrequencyVoltage selection is based upon economic considerations, taking the following factors into ac-count:a. Size and location of loads.b. Provision of future extension.c. Short-circuit level.d. Availability of switchgear with suitable current rating and rupturing capacity.e. Possibility of keeping the number of different voltage levels to a minimum.f. Voltage levels available in the overall plant





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The voltages listed in Table 1 below are available:

DESCRIPTION VOLT-AGE

PHASES WIRES

AC/DC FREQ.

EARTHING METHOD

Plant intake voltage 33 kV 3/3 50 Hz ResistancePlant distribution 6.6 kV 3/3 50 Hz ResistanceElectric motors Pn > 160 kW 6.6 kV 3/3 50 Hz Resistance0.37 Pn 160 kW 415 V 3/3 50 Hz SolidPn < 0.37 kW 240 V 1/2 50 Hz Solid

Normal lighting, small power, etc.

Critical lighting (*2)

415 V240 V

220 V

3/41/2

-/2

50 Hz50 Hz

DC

SolidSolid--

AC UPS system (*1) 240 V 1/2 50 Hz SolidControl circuits (general)For MCC starter units to be derived from individual feeder in MCC

240 V 1/2 50 Hz Solid

Control circuits switchgear:

Closing / meteringTrip / protection (*2)

240 V110 V

1/2-/2

50 HzDC

Solid-

Instruments (general) 240 V 1/2 50 Hz SolidDCS, F&G, SGS systems.To be derived from AC UPS

110 V 1/2 50 Hz Solid

Fire alarm system (*2) 24 V -/2 DCSolenoids (*2) 110 V -/2 DC -

Table 1 Notes1. Pending on UPS output a three phase four wire system (415/240 V AC UPS) can be selected.2. Floating supply systems shall be provided with an earth-fault detection system.

5.1.4 Voltage and Frequency Variations

Voltage and frequency static variations in the AC supply system shall remain within the following limits:

Voltage Unom ± 10%.Frequency 50 Hz ± 3%.Combined voltage and frequency ± 10%.

The voltage variations static variations in DC supply systems shall remain within + 10 % and –20 % of the nominal voltage at the equipment terminals. This voltage window accounts for varia-tions during charging and discharging of the battery systems.

The system design shall be such that the system stability is maintained when the supply voltage and frequency remain within the limits given above.The system design shall ensure that the voltage drop at the affected bus does not exceed 10 % in case of start-up if the largest motor or reacceleration of a group of motors.The voltage available at the motor terminals during start-up must be sufficient to ensure positive starting or reacceleration of the motor (even with the motor fully loaded, if required), without





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causing any damage to the motor.Fore low voltage motors, the voltage available at the motor terminals must not be less than 80 % of the rated value during start-up or reacceleration.For high voltage motors, the voltage available at the motor terminals must not be less than 80 % of the rated value during start-up or reacceleration.

5.1.5 Electrical Loads and Electricity Consumption

All the components of the electrical systems must be sized for 120% of the maximum load, un-der the worst operating conditions.The worst operating condition is specified as that condition that can occur under normal operat-ing conditions with limited maintenance in the electrical system, e.g. one transformer out of ser-vice in a double ended distribution system.Generally, the worst condition for a distribution system can be calculated as follows: 100% of the normal continuous running load + 30% of the intermittent and spare load + 10% of the stand-by load (or the largest loads, whichever is the largest).

5.1.6 Shortcircuit Ratings

All equipment shall be designed to have a making, withstand and breaking capacity higher than the maximum value of short-circuit current calculated at the fault location.Equipment shall withstand the maximum available fault current for one (1) second or three (3) seconds as applicable in relation to the protection.The sizing of medium-voltage cables shall be based on the short-circuit withstand capacity for a minimum time period as dictated by the protection system.Short-circuit duties shall include motor contribution.

All equipment shall be capable of withstanding the effects of short circuit currents and con-sequential voltages arising in the event of equipment or circuit faults. Damage occurring at the fault location is excluded from the above.

For installations above 1000 Volts, the short circuit current contributions from all supplies which can be operated in parallel shall include contributions via bus section switches or inter-connectors which are capable of being operated simultaneously in the closed position. This in-cludes bus section switches or interconnectors, etc., which are intended for normally open op-eration and on which no interlocking has been provided to prevent simultaneous closure.

For LV switchboards equipped with multiple transformer incomers and/or generator incomers, the shortcircuit rating of LV switchboards may be based on the number of permanently con-nected incoming feeders, provided that the remainder of the LV incoming feeders shall be equipped with automatic disconnecting logic circuitry ensuring that parallel operation of all LV infeeds over max 5 seconds is not possible.

For installations above 1000 Volts, automatic break-before-make changeover arrangements of supply capacity shall not be introduced with the specific aim of justifying the use of equipment having a lower short circuit rating than would otherwise be required when based on the paral-lel operation of all available supplies.

When determining equipment short circuit ratings, the effects of contributions from asynchron-ous and synchronous machines on the switching duties of switchgear and on the dynamic and thermal loading of the electrical installations in general shall be taken into account.

Note:





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Attention shall be paid to the short-circuit strength of the switchgear and all its components and the rela-tionship between peak and rms values of the short circuit currents that may occur, particularly when the switchboard is directly connected to generators.

5.2 SERVICE CONDITIONS

5.2.1 The site conditions as described in the Process Design Basis Memorandum (LTD Job No 12605) and as per Site & Utility Data Sheet shall be applicable as design basis for all outdoor in-stalled electrical equipment and apparatus. (Refer Attachment 1) Inside air-conditioned buildings the standard operating temperatures and humidities apply as per applicable IEC standards. However all electrical equipment shall meet the requirements for “tropicalization”.

5.3 ENCLOSURE DEGREE OF PROTECTION

5.3.1 The minimum equipment enclosure degree of protection according to IEC 60529 shall be as fol-lows:

IP 31 Indoor. IP 20 Panels with open doors (life parts shielded). IP 55 Outdoor.

Note that explosion protection requirements may require a higher degree of protection.

5.4 ELECTRICAL AREA CLASSIFICATION

5.4.1 All the areas within the battery limits shall be classified for the degree and the extent of hazard from flammable material. The basis for hazardous area classification recognizes the differing de-grees of probability, with which flammable atmosphere may arise in installation, in terms of fre-quency of occurrence and the probable duration of existence on each occasion.The area classification layout shall show the sources of gas explosion hazards.

5.4.2 The area classification shall be in accordance with IS:5572.For undefined cases IEC 60079-10 and/or API RP 505 shall be applied.

5.4.3 The electrical equipment and installations shall be selected for suitability of use in the classified areas in accordance with IS 5571.The selected electrical apparatus shall be adequately protected against corrosive and solvent agencies, water ingress, thermal and mechanical stresses as determined by the environmental conditions. General guidelines for type of protection for electrical equipment in hazardous areas are listed below in table 2.





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AREACLASSIFICATION

DESCRIPTION SYMBOLEx

Zone 0 Intrinsic safe category "ia" iaOther electrical apparatus, specifically designed for zone 0 s

Zone 1 Any type of protection adequate for zone 0 (not preferred)Flameproof enclosure dIntrinsic safe category "ib" ibPressurization (see table 2) pSand filling qOther electrical apparatus specifically designed for zone 1 s

Zone 2 Any type of protection adequate for zone 0 or zone 1 (not preferred)Oil immersion (see note 2) oIncreased safety (see note 1) eNonsparking apparatus (see note 1) n

Table 2. Adequate types of protection

Notes:1. For all outdoor installations, including the apparatus with type of protection "e" and type of protection

"n", the degree of protection shall be in accordance with section 5.3.2. Oil-immersed apparatus may be used only in case its security will not be impaired by tilting or vibra-

tion of the apparatus.

5.4.4 All materials installed in a hazardous area shall have a certificate of conformity or a declaration of compliance issued by the appropriate authority.

5.5 SUBSTATION

5.5.1 Location

5.5.1.1 Substation buildings shall be located in an unclassified area, at least 15 meters away from any source of gas explosion hazard. Ingress of sand and hazardous gases into the building shall be prevented.

5.5.1.2 The buildings and the outdoor facilities shall be easily accessible from the road.

5.5.2 Construction Requirements

5.5.2.1 An outdoor transformer yard shall be provided. Transformers shall be separated by fire walls. Bays shall be enclosed with wire mesh fences. A minimum free space of 1 meter shall be provided around transformers and neutral earthing resistors.

5.5.2.2 The switch room shall be designed taking into consideration a future equipment expansion of 20%.

5.5.2.3 Equipment arrangement shall allow easy installation, operation and maintenance of the equip-ment and future equipment extensions. The minimum equipment clearances are given in table 3 below. The free distance between HV and LV equipment shall be minimum 2.5 meters. Position-





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ing of the transformer bays shall be related to the switchgear orientation, such to minimize the bus duct or cable length.

DESCRIPTION MINIMUM CLEAR-ANCE

REMARKS

HV switchgear front 2500 mmLV MCC front 1500 mmLV switchgear ends 1000 mmCommon aisle space Largest equipment

depth + 200 mmEquipment door width 200 mm wider than

equipment width Equipment door height 200 mm higher than

highest equipment

Table 3

5.5.2.4 The battery room shall be completely separated from the switch room and shall only have ac-cess from the outside of the building. The floor shall be acid resistant. Possible spilled liquid shall be collected in a suitable basin. The ventilation system of the battery room shall extract air from the higher part of the room and shall provide sufficient air changes as to keep the hydrogen con-centration below 10% LEL during boost charging. Air shall be supplied from the HVAC system to keep the room temperature low thus increasing the battery lifetime.

5.5.2.5 A cable vault shall be provided under the switch room. Cables shall enter the switch room via this vault and shall be installed on cable trays.All cut-outs / openings in the substation requiring fireproofing as per statutory equirements, shall have a fire withstand capacity of minimum 3 hous.

5.5.3 Safety

5.5.3.1 The switch room shall have two (2) doors located opposite of each other which can be used in case of emergency. Doors shall be provided with panic bars. Same requirements apply to the door to the battery room. Emergency doors shall be permanently closed and shall be sealed with gaskets.

5.5.3.2 Manual fire alarm stations shall be provided outside the substation and shall be located near the doors.

5.5.3.3 A fire detection system shall be provided covering at least the switch room, cable cellar and bat-tery room. Detectors shall be ceiling mounted preferably above potential fire hazards. The bat-tery room shall be provided with a hydrogen gas detector.

5.5.3.4 An eyewash bottle shall be provided inside the battery room.

5.6 ELECTRICAL INSTALLATIONS OF BUILDINGS





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5.6.1 The electrical installation shall as a minimum comply with the IEC 60364 requirements and the requirement of this section.

5.6.2 The lighting installation inside the building shall consist of normal and emergency lighting

5.6.3 Normal lighting shall be fluorescent type. Lighting inside buildings shall be controlled by switches. Switch room lighting control shall be by change-over switches located near each door.Lighting on the outside of the building (in transformer bays, etc.) shall be photocell controlled to-gether with the general outdoor lighting.

5.6.4 Normal emergency lighting shall be of the fluorescent type with built-in nickel-cadmium batteries with a minimum back-up time of one (1) hour. Exit lights with pictograms shall be provided as part of the emergency lighting installation.

5.6.5 A portable lighting fixture complete with battery and battery charger shall be provided for the substation building.

5.6.5 Battery room lighting shall be suitable for zone 1, gas group IIC, T3.

5.6.6 Metal structures, reinforcing steel, doors and fences shall be earthed.

5.7 AC SWITCHGEAR AND CONTROL GEAR ASSEMBLIES.

5.7.1 High voltage switchgear and controlgear assemblies shall be designed to minimise the risk of short circuit and to ensure personnel and operational safety during all operating conditions, in-spection, maintenance, the connection of main, control and auxiliary cables, and the equipping and commissioning of spare panels whilst alive in operation.High voltage switchgear and controlgear assemblies shall be of the metal clad withdrawable type, dead front structure, having a single busbar system and consist of a number of separate panels assembled into one or more sections. Sections shall be electrically interconnected by a sectionalising switching device.HV switchgear and controlgear assemblies shall be freestanding, floor mounted, consisting of switchgear panels forming a single assembly with a common bus-bar system. HV switchgear and controlgear assemblies shall be installed indoors in an airconditioned envi-ronment.Switchgear insulation medium shall be atmospheric air. The switching medium shall be either vacuum or gas (SF6).The design shall be arc-proof in accordance with IEC 62271.

5.7.2 All LV switchgear and control gear (also covering Motor Control Centres) shall be of indoor type, metal enclosed execution. LV switchgear and control gear shall be draw-out design, air-break equipment and shall as a minimum have form 3 protection in accordance with IEC 60439.The low-voltage AC switchgear and controlgear assembly shall be designed to minimise the risk of short circuit and to ensure personnel and operational safety during all operating condi-tions, inspection, maintenance, the connection of main, control and auxiliary cables, and the equipping and commissioning of spare panels whilst alive in operation.Low voltage AC switchgear and controlgear assemblies shall be freestanding, floor mounted. The assembly shall consist of standard switchgear and control gear panels forming a single assembly with a common bus-bar system and shall have front access only for operation, cable connection and maintenance activities. The low-voltage AC switchgear and controlgear assembly shall be installed indoors in an air-conditioned environment.Starter and outgoing feeder units shall be executed with fuse / switch combinations.





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5.7.3 Switchgear shall be designed in accordance with the relevant project engineering specifications.Switchgear sizing shall be accordance with the system calculations taking into consideration the future expansions.

5.7.3 Low-voltage local distribution panels and/or switchboards shall be provided for following:

Lighting. Socket outlets. Electric tracing. HVAC. Electrical installations in buildings. Package units. Remote areas where motors are grouped and it is impractical to group starters into a

centralized Motor Control Center.

These distribution panels shall as a minimum comply with the project engineering specification and shall be installed locally as close as possible to the loads to be connected.

5.7.4 All cabinets, panels or apparatus in which dangerous touch voltage occurs, and which are not fully insulated shall be equipped with facilities for safety earthing.

5.8 TRANSFORMERS

5.8.1 Transformers shall be supplied in accordance with the requirements of project engineering spec-ification. Transformers shall be of the oil-immersed type (ONAN) and shall be suitable for out-door installation. Rating of transformers shall include a minimum spare capacity of 20%. For the secondary voltage adjustment transformers shall be equipped with a 5-step (2.5% per step) manual off-circuit tap changer.Transformers shall have provisions for the addition of automatic cooling fans. The space for components such as starters, switches, contacts, etc., as required to fulfill this requirement shall be provided in the marshalling box

5.9 EARTHING RESISTORS

5.9.1 Earthing resistors shall be rated for ten (10) seconds and a maximum of three (3) interventions per hour. The specified minimum duration of each intervention shall be five (5) times the clearing time of the slowest earth fault relay in response to 80% of the initial maximum earth-fault current.

5.10 BUS DUCTS

The bus bars (MV and LV) shall be made of electrolytic copper or aluminum. It must be suitably supported at regular intervals and both bus bars and supports shall be adequately sized and damped to withstand the estimated short-circuit current without permanent deformation.Medium-voltage bus duct shall be of phase segregated type. The bus insulators shall be of non-hygroscopic noninflammable material.Earth bus bars shall run along the full length of the bus duct without any break. The bus bars shall be color coded. The bus duct housing the bus bars shall be of totally enclosed, sheet steel construction, dust and vermin proof with removable covers. The bus duct shall also be supplied with flexible links for connection at both the ends (for power buses, neutral and earth as applica-ble) and bus duct support material. The flexible links shall be made up of metal to match with





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mating surface to avoid bimetallic corrosion.All hardware shall be corrosion resistant.

5.11 ELECTRIC MOTORS

5.11.1 Electric motors shall be in accordance with project engineering specifications. Motors shall be supplied together with the driven equipment in which the supplier of the complete unit will be re-sponsible for compliance with the project requirements.

5.11.2 Motors shall be standardized on make, type and execution to the maximum extent.

5.11.3 In case speed control is required this shall be done with frequency controlled asynchronous 3-phase cage induction motors. The system shall comply with the applicable project engineering specification.

5.12 PROTECTION AND CONTROL REQUIREMENTS

5.12.1 The minimum required protection functions for MV feeder types and for LV incoming and buscoupler circuits are indicated in Attachment II.

5.12.2 LV motor feeder units (starter units) shall furthermore as a minimum be equipped with the follow-ing control and protection functions:

Overload. Shortcircuit Earth fault. Auto restart provisions.

5.12.3 Electric motor drives shall in principle receive start and stop commands from a control station in the field, local to the motor. In the ‘off’ position this switch shall function as safety switch, by short circuiting the main contactor coil.As per statutory requirement, each electric motor drive shall also be provided with an emergency stop switch local to the motor.Operational start/stop commands may also come via the DCS.Motor control circuits shall be hard-wired from MCC via interposing relays to the plant safe-guarding system.Emergency shutdown of equipment shall, if required, be possible irrespective of any PLC / mi-croprocessor failure.In the case of A-B set-up motor drives, emergency change over shall be possible via the safe-guarding system.

5.12.4 Motor control circuits shall include provisions for including a safety switch and an emergency switch (see above).

5.12.5 When connected to a subfeeder circuit, small motors driving non process equipment may be controlled by manual starters at the motor.

5.12.6 Contactor or circuitbreaker controlled switchgear and MCC feeder units shall include provisions for external opening and closing commands.





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5.13 EMERGENCY SUPPLY SYSTEMS

5.13.1 The basic arrangement of the emergency supply systems shall be as indicated on the key single line diagram.

5.13.2 An emergency distribution network shall be provided as an integrated part of the normal power distribution system.

5.13.3 The emergency generator set shall form a complete self-sustained package, not requiring any other power source for start-up and control. The set shall be complete with the necessary start-ing equipment, associated control panel and shall be suitable for remote starting.The emergency generator set shall be designed to start automatically on power failure and feed the emergency loads. It shall be capable of dealing with load variations such as the starting of large motors on a loaded system.The emergency generator shall be diesel engine driven.

5.13.4 The AC UPS shall be in accordance with the project engineering specification and have a back-up time of minimum 30 minutes. A maintenance bypass switch shall be included. The UPS by-pass shall include a low-capacity type transformer with the possibility for voltage adjustment.

5.13.5 The DC UPS system (rectifiers and batteries) shall be in accordance with the project engineer-ing specification. A single rectifier with a battery with a back-up time of minimum 30 minutes is required.Fire alarm systems shall have a dedicated 24 V DC UPS system, with a battery backup time in accordance with IS 2189.Telephone systems shall have an independent battery back-up system

5.14 ANNUNCIATORS

5.14.1 An annunciator panel shall be provided in the substation close to the entrance collecting the common system alarms. Status indications shall be maintained even when a power failure oc-curs. Alarms shall have a manual reset. A general electrical alarm shall be brought to the DCS.

5.15 POWER INSTALLATION

5.15.1 Cable sizing shall be based on the following:

1. Current carrying capacity conform to IEC 60287.2. Rating factors appropriate for the method of installation.3. Load factors as specified in paragraph 5.15.3.4. Allowable circuit voltage drop as specified in table 4.5. Limitation of conductor temperature rise during short circuit to 160°C for PVC and 250°C

for XLPE insulated cables (for sizing see IEC 60364-4-43).

5.15.2 Cables shall be sized in accordance with the applicable IEC standards. In office buildings devia-tions to these requirements are allowed provided that the requirements of IEC 60364, part 4 are fulfilled.

5.15.3 Main feeder cables as well as the bus-bar systems shall be sized to allow for 20% future load (i.e. main feeders to the plant shall be sized for 120% of the maximum working load).





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Transformer cables shall, when applicable, be sized for the forced cooled rating of the trans-former.

Feeder cables to subdistribution systems shall be sized for 120% apparent power or the name-plate power, whichever is the highest.





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DESCRIPTIONNOMINALVOLTAGE

DROP

VOLTAGEDROP @ START

MV distribution system cables 1% N.A.LV distribution system cables 1% N.A.Motors 5% 15%Cables to lighting and small powerpanels

1% N.A.

Cables to lighting fixtures 4% N.A.Cables to tracing panels 2% N.A.Cables to tracing circuits 3% N.A.

Table 4

5.15.4 Minimum conductor sizes shall be as follows:

Cable Rated Voltage Um

Power 6.6 kV 70 mm2 6/10 kV 12 kVPower 0.415 kV 2.5 mm2 0.6/1 kV 1 kVLighting circuits 2.5 mm2 0.6/1 kV 1 kVControl circuits 1.5 mm2 0.6/1 kV 1 kV

5.15.5 Power and control cables shall be installed conform the requirements of the project design spec-ification and the project construction specification.

5.15.6 MV cables shall comply with IEC 60502. Cables shall be single or multi core and have stranded copper conductors with extruded XLPE insulation. MV cable terminations shall be executed with dedicated termination kits.

5.15.7 Low-voltage power cable shall have XLPE insulated plain or metal-coated circular copper wires, solid circular up to 4 mm², stranded circular or shaped 6 mm² and above, in accordance with IEC 60228, class 1 and class 2, respectively. Cables shall have a non-flame propagating PVC outer sheath in accordance with IEC 60332-3 category C.

5.15.8 All cables in process / paved areas shall be installed underground in concrete trenches filled with clean sand.In other areas cables may be directly buried and shall be covered with a warning tape through-out the length of the trench. For consumers at grade cables shall run completely underground. For consumers above-grade cables shall run in trenches up to the nearest structure and shall then continue in cable trays with covers to protect them from sun radiation. Single cables shall be installed in open conduit.Cables shall be identified with a unique number conform the project cable numbering system. Tags shall be installed on each end of the cable, at one end of the pipe sleeves and at substa-tion entry points.

5.16 EARTHING INSTALLATION

5.16.1 A reliable earthing installation shall be provided for safety earthing, static earthing, lightning pro-tection and instrument earthing systems that considers the basic requirement and principles of IEC 61000 supplemented by statutory requirements (IS 3043). The earthing system shall ensure





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safety to personnel in relation to touch and step voltages and protect equipment against damage associated with rise of potential.

5.16.2 The earthing system for new units shall be interconnected with the earthing system of the overall plant and (if applicable) the existing earthing grid in order to create one (1) overall earthing sys-tem.

5.16.3 The type of earthing grid shall be determined on basis of the soil conductivity. The resistance of the grid shall be 1 ohm maximum.

5.16.4 The grid shall consist of 70 mm² yellow/green insulated PVC stranded copper wire. Branches to equipment shall be minimum 16 mm².

5.16.5 All exposed conductive parts of equipment shall be connected to an earth loop. For power trans-formers equipped with a tank protective device, the active part shall be led through the protec-tion current transformer.

5.16.6 Inside hazardous areas all in-line instruments and valves that are clamped between nonconduc-tive packings shall be interconnected with a conductor of 16 mm². For this purpose adequate lugs shall be provided on both the instrument (valve) and the pipeline.

5.16.7 The earthing installation shall meet the requirements of IEC 60364-5-54. Special attention shall be given to touch voltages.

5.16.8 The lightning protection system shall (if required) be designed in accordance with IEC 61024-1. Where appropriate, surge protection shall be installed to limit secondary effects of lightning strokes. Self conducting structures shall not be provided with lightning rods and down conduc-tors, but shall be connected to the earthing grid at two points of the base.

5.16.9 Metal structures, reinforcing steel, doors and fences shall be connected to the earth loop of each unit. Large structures shall be earthed every 25 meter.

5.16.10 For multiple connections an earth collector bus bar shall be used. This busbar shall be mounted above grade and shall be mechanically protected.

5.16.11 The earth connection of the 415/240 V system shall be made in the switchgear between the neu-tral and the earth bus bar by means of a removable link.

5.17 LIGHTING INSTALLATION

5.17.1 The plant lighting design shall be such that an economic optimization is obtained by applying a combination of both area and local lighting with a mixture of floodlights and fluorescent fixtures. For street and security lighting high pressure sodium fixtures shall be used.

5.17.2 The lighting installation shall be designed using local distribution panels suitable for the area classification and environmental conditions in the unit.

5.17.3 The lighting system shall be designed to provide a sustained and uniform illumination level of not less than the levels given in table 5 taking into consideration a fouling factor of .8 for outdoor in-stalled fixtures. The table has been derived from table 4 of API RP 540 and uses currently rec-ommended values for chemical and petrochemical plants. OISD –RP-149 has been accounted for as well.





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Area description Horizontal illuminationlevelAverage

Lux

Elevation(mm)

Equipment area’s, pumps, valves, manifolds,operating platforms, instruments*, gauges*

60 Ground

Furnaces, heat exchangers 60 GroundCompressor area 200 Ground Pump houses, sheds 100 GroundGeneral area’s, ladders (inactively used) 10 GroundMain operation platforms & access stairs 60 FloorOrdinary platforms 20 FloorStairs (other than main) 50 FloorOutdoor control panels * 200 (Vert) FloorCentral control room, instrument panels*,Consoles*

500 Floor

Satellite control, instrument panels*,Consoles*

500 (Vert) +750

Laboratories & test rooms 800 +750Locker rooms, lavatory 100 FloorGeneral loading area 30 + 750Tank/truck loading points 100 PointTank farm 10 GroundOutdoor switchyards operating area 100 GroundOutdoor switchyards other areas 50 GroundSubstation general (indoor),switchracks

150 Floor

Under substation (cellar) 70 GroundSubstation operating aisles 150 GroundBattery room 150 FloorTransformer bays 100 GroundMaintenance workshop 200 WorkbenchWarehouses and stores 100 WorkbenchAdministration building general offices 800 +750Drafting office 1000 +750Reception area’s, hallways 200 FloorStreet lighting (main roads) 10 GroundStreet lighting (secondary roads) 5 GroundParking lots 1 Ground

Table 5

Note: * Denotes vertical illumination level.

5.17.4 Emergency lighting shall be provided inside buildings, on escape routes inside the process units and in vital operator areas. The lighting level on the escape routes shall under emergency condi-tions be at least 10 lux.Emergency lighting fixtures shall form part of the normal lighting installation and shall have built-in nickel-cadmium batteries with a back-up time of minimum 30 minutes.





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5.17.5 Fixtures for general room or area lighting shall be fluorescent fixtures with symmetrical lens. For control rooms, a ceiling metallic grid parabolic system shall be provided. Lighting for control rooms instrument boards and other similar installation shall be designed to illuminate vertical panel mounted equipment and details without glare.

5.17.6 Long life high pressure sodium vapor fixtures shall, when used, have constant wattage high-power factor ballasts and color-corrected lamps.Sodium vapor lighting fixtures shall only be used for non-hazardous areas.Floodlights for use in hazardous area shall be high pressure mercury vapor type execution

5.17.7 General process unit lighting shall be automatically controlled by a photocell. Hand-Off-Auto se-lector switches and contactors for automatic lighting control shall be installed in the lighting pan-els.

5.17.8 The load of each lighting circuit shall be balanced over the 3 phases, as much as possible. In general, circuits shall be switched from lighting panels.

5.18 MAINTENANCE SOCKET OUTLETS

5.18.1 Receptacle assemblies for maintenance power shall be installed on such locations that the max-imum length of extension cords will be limited to 30 m. The centerline elevation of receptacles shall be approximately 1.20 m. Receptacles shall have earth-fault protection (sensitivity 30 mA).

5.18.2 For maximum voltage drop table 4 shall be applied with values as for lighting.

5.19 ELECTRIC TRACING

5.19.1 Only where indicated on the piping and instrument diagrams electric tracing shall be installed. Calculations shall be based on the minimum design ambient temperature.

5.19.2 The requirements for design, supply, installation and testing are given in project engineering specification.

5.20 COMMUNICATION AND SECURITY SYSTEMS

5.20.1 Communication and security system requirements are defined in the project specifications of the Instrumentation and Control Systems group (section 120.331)

5.21 CATHODIC PROTECTION

5.21.1 Cathodic protection shall be provided on underground metallic piping, storage tanks etc. In case of extensions to existing systems the existing cathodic protection system shall be modified for the extensions.The system shall be designed and installed by an experienced cathodic protection firm in accor-dance with the requirements of the project engineering specification





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6. MATERIALS

6.1 All materials shall be new and of proven design. All equipment and material shall be suitable for the at the installation site applicable circumstances.

6.2 Materials applied inside buildings shall be flame retardant, low smoke generation execution.

6.3 The bidders list issued by the Client, who may specify certain makes and types, shall be fol-lowed. When a supplier cannot fully comply with the requirements, the deviations shall be listed and alternatives shall be specified in detail.

6.3 Application of deviating materials can, if of similar quality, or when they are built to equivalent US standards, be approved by Client.

7. TESTING AND COMMISSIONING

7.1 All equipment and material shall tested and/or inspected in accordance with the applicable project engineering specification prior to shipment to site.

7.2 The contractor shall prepare commissioning procedures, including test records. Subject proce-dures shall be approved by Client prior to commissioning.

7.3 After installation completion field tests shall be performed in accordance with the approved com-missioning procedures. For complex equipment vendor representatives shall be present during commissioning.

8. CORROSION PROTECTION

8.1 All metal parts belonging to the electrical installation shall be protected against corrosion in ac-cordance with manufacturer's standard corrosion protection system suitable for the environmen-tal conditions specified.

8.2 Supporting steelwork shall be treated in accordance with the system specified for structural steel.

8.3 Underground coated metallic systems shall, if damaged parts are subject to electrolytic corro-sion, be cathodically protected (see subsection 5.21)





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9. DOCUMENTATION

9.1 Documentation and information shall be supplied as specified by Client.

9.2 During the detailed design phase those documents that give a clear impression of the function-ing and the configuration of the systems, apparatus and installation shall be submitted to Client for approval.As a minimum following document shall be sent for approval:

Specifications. Area classification layouts, sections and list of hazardous sources. Substation lay-out drawings. Single-line diagrams. Electrical consumer list. Equipment and material requisitions. System calculations. Relay coordination diagrams. Main cable lay-out drawings. Cable sizing calculation and criteria. Cable lists. Installation drawings and functional block diagrams for control and protection systems.

Other documents shall be issued to Client for information.

9.3 Approval of documents does not release Contractor or Supplier of his responsibilities with regard to the quality and reliability of his installation.

9.4 Drawings and schematics shall be prepared in accordance with the relevant IEC standards. If the applied symbology deviates from the IEC symbols a legend shall be supplied with explana-tory notes.

9.5 Basically all documents shall be prepared on electronic format. CAD tools shall be selected in coordination with the Client. Listings, calculations and reports shall be generated with standard available commercial software (subject to approval by Client).

9.6 All documents shall bear a unique identification (document) number.

9.7 Drawings, schematics, operating and maintenance manuals shall be in the English language.

10. MARKING

10.1 Equipment and material shall be marked in compliance with the project requirements.

10.2 Wiring shall be marked on both ends with the terminal numbers of the terminals to which the wires are connected.

10.3 Requirements for rating plates, nameplates and equipment number plates shall be conform IEC standards and shall be specified in detail in the individual equipment and material specifications.

10.3 Equipment certified for use in hazardous areas shall be marked in accordance with the require-ments of IEC 60079.





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11. REFERENCE DOCUMENTS

04184-120311-000008 Electrical Consumer List 04184-120311-000009 Electrical Load Calculation 04184-120311-000010 Electrical Load Summary Report 04184-120311-000013 Overall Single-line Diagram. 04184-120331-000018 Main Instrument and Electrical Cable Trench

Routing

12. ATTACHMENTS

I Site & Utility Data (extract of Process Design Basis Memorandum)II Minimum Protection Requirements (tabulation)





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ATTACHMENT I Site and Utility Data





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ATTACHMENT II Minimum Protection Requirements

PROTECTION PER FEEDER TYPE

DESCRIPTION OF BASIC FUNCTIONS





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ANSI Device Number

Short Protection Description Long Protection Description

2 Timer Timer relay is a device that functions to give a desired amount of time delay before or after any point of operation in a switch-ing sequence or protective relay system, except as specifically provided by device functions 48, 62 and 79.

25 Synchronism Check Synchronism check device is a device that operates when two AC circuits are within the desired limits of frequency, phase an-gle and voltage, to permit or to cause the paralleling of these two circuits.

26 High Winding Temperature High winding temperature device is device that functions when the temperature of the winding of a machine exceeds a prede-termined value.

27 Under Voltage Under voltage relay is a relay that functions on a given value of undervoltage.

30 Annunciator Relay Annunciator relay is a non-automatically reset device that gives a number of separate visual indications upon the func-tioning of protective devices and which may also be arranged to perform a lock-out function.

32 Directional Power Directional power relay is a device that functions on a desired value of power flow in a given direction.(32N/64N = Watt metric Earth Fault)

37 Under Power / Loss of Load Under power relay is a relay that functions when the power flow decreases below a predetermined value.

38 Bearing Protective Device Bearing protective device is a device that functions on exces-sive bearing temperature, or on other abnormal mechanical conditions associated with bearings, such as undue wear, which may eventually result in excessive bearing temperature or failure.

46 Phase Unbalance Phase unbalance relay is a relay that functions when the polyphase currents are unbalance or contain negative phase-sequence components above a given value.

47 Phase Sequence Check Phase sequence check relay is a relay that functions upon a predetermined value of polyphase voltage in the desired phase sequence.

48 Stall Protection Stall protection relay is a relay that generally returns the equip-ment to the normal or off position and locks it out if the normal starting or operating sequence is not properly completed within a predetermined time.

49 Thermal Over Current Thermal over current relay is a relay that functions when the temperature of a load-carrying winding or element of a ma-chine exceeds a predetermined value.

50 (Time delayed) Instantaneous Over Current

Instantaneous over current relay is a relay that functions in-stantaneously on an excessive value of current or on an ex-cessive rate of current rise. The operation can be time delayed for selectivity.(50N = Earth Fault – Core Balance Type)

ANSI Device Number

Short Protection Description Long Protection Description

51 AC Time Over Current AC time over current relay is a relay with either a definite or in-verse time characteristic that functions when the current in an AC circuit exceeds a predetermined value.





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(51LR = AC Time Over Current – Locked Rotor)55 Out-of-Step Out-of-Step relay is a relay that operates when the power fac-

tor in an AC circuit falls below a predetermined value for a defi-nite time.

59 Over Voltage Over voltage relay is a relay that functions on a given value of over voltage.(59N = Residual Over Voltage – Earth Fault)

63 Pressure Switch (Buchholz) A device that operates at a given pressure value or at a given rate of change of pressure.

64 Earthfault Protective Relay. Earthfault protective relay is a relay that functions on failure of the insulation of a machine, transformer or of other apparatus to earth.(32N/64N = Watt metric Earth Fault)

67 AC Directional Over Current AC directional over current relay is a relay that functions on a desired value of AC over current flowing in a predetermined di-rection.

74 Trip Circuit Supervision Trip circuit supervision relay is a relay, other than an annuncia-tor as covered under device function 30, that is used to oper-ate, or to operate in connection with a visual or audible alarm.

81 Frequency Relay Frequency relay is a relay that functions on a predetermined value of frequency.

86 Lock-out Relay Lock-out relay is an electrically operated, hand or electrically reset, relay or device that functions to shut down or hold an equipment out of service or both, upon the occurrence of ab-normal conditions.

87 Differential Current Differential current relay is a protective relay that functions on a percentage or phase angle or other quantitative difference of two currents.

97 Fuse Failure Used only for specific applications.





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TABLE FOR PROTECTION PER FEEDER TYPE (MV distribution)

6.6 kV DistributionANSI

DeviceNumber

Protection Description Incoming Transf. Feeder

Bus-Tie & Metering

DistribTransf.Feeder

Outgoing Line

Feeder

Incoming Line

Feeder

MotorFeeder

Capacitor Bank

Feeder

2 Timer X 4)25 Synchronism Check X 4) X 4) X 4)26 High Winding Temperature X 4) X 4) 5)27 Under Voltage X 4) X 4) X 4) X 4)30 System Analysis and Measurement Unit

for Remote MonitoringX 4) X 4) X 4) X 4) X 4) X 4) X 4)

32N Reverse power (earth fault) S 1) 4)37 Under Power / Loss of Load S 1) 4)38 Bearing Protective Device S 1)4)5)47 Phase Sequence Check S 1) 4)48 Stall Protection S 1) 4)

495051

50N46

51LR

Motor Protection Relay with:Thermal Over CurrentInstantaneous Over CurrentAC Time Over CurrentEarth Fault (Core Balance Type)Phase UnbalanceLocked Rotor

X 4)

49O Transformer High Oil Temperature X 4)50 (Time delayed) Instantaneous Over Cur-

rentX 4) X 4) X 4) X 4) 6)

50N Earth Fault (Core Balance Type) X 4) X 4) X 4) X 4)51 2) AC Time Over Current X 4) X 4) X 4) X 4) X 4) X 4)

51N AC Time Over Current (Earth Fault) X 4) X 4) X 4) X 4) S 1) 4)51NB Backup Earthfault Relay (secondary side

neutral)X 4

55 Out-of-Step S 1) 4)59 Over Voltage S 1) 4) X 4)

59N Residual Over Voltage S 1) 4) X 4)63 Transformer Buchholz X 4)

64N Earth Fault Protection (neutral displace-ment)

S 1) 4)

64R Restricted Earth Fault X 4)67N AC Directional Earth Fault S 1) 4)

74 3) Trip / Close Circuit Supervision X X 4) X X 4) X 4) X 4) X X 4) X 4) X 4)81U Under Frequency S 1) 4)86 Lock Out Relay X 4) X 4) X 4) X 4) X 4) X 4) X 4)87 Differential Current X 4).7) X 5)97 Fuse failure X 4) X 4) X 4)

1) S = Additional protection for synchronous motors.2) AC time overcurrent relays to have multiple time and current setting possibilities.3) The control of the trip circuit operability shall be made in any case and the supervision of the closing circuit shall be made on the

circuit breakers of most important units and on electrical devices which are used on ATS diagrams and remote control.4) Functions shall be combined in a multifunction protection, measuring, signaling and communication unit.5) For motors with rating of 1500 kW and above.6) Relay and associated CT’s to be selected and sized for higher harmonics.7) For transformers rated 5MVA and above.





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TABLE FOR PROTECTION PER FEEDER TYPE (LV DISTRIBUTION)

LV DistributionANSI

DeviceNumber

Protection Description Incom-ing

Transf. Feeder

Bus-Tie & Meter-

ing

2 Timer X 4)25 Synchronism Check X 4) X 4)26 High Winding Temperature27 Under Voltage X 4) X 4)30 System Analysis and Measurement Unit for Remote Moni-

toringX 4) X 4)

32N Reverse power (earth fault)37 Under Power / Loss of Load38 Bearing Protective Device47 Phase Sequence Check48 Stall Protection

495051

50N46

51LR

Motor Protection Relay with:Thermal Over CurrentInstantaneous Over CurrentAC Time Over CurrentEarth Fault (Core Balance Type)Phase UnbalanceLocked Rotor

49O Transformer High Oil Temperature50 (Time delayed) Instantaneous Over Current

50N Earth Fault (Core Balance Type)51 2) AC Time Over Current X 4) X 4)

51N AC Time Over Current (Earth Fault) X 4)51NB Backup Earthfault Relay (secondary side neutral)

55 Out-of-Step59 Over Voltage

59N Residual Over Voltage63 Transformer Buchholz

64N Earth Fault Protection (neutral displacement)64R Restricted Earth Fault X 4)67N AC Directional Earth Fault

74 3) Trip / Close Circuit Supervision X 4) X 4)81U Under Frequency86 Lock Out Relay X 4) X 4)87 Differential Current97 Fuse failure X 4) X 4)

1) Not used2) AC Time overcurrent relays to have multiple time and current setting possibilities.3) The control of the trip circuit operability shall be made in any case and the supervision of the closing circuit shall be made on the

circuit breakers of most important units and on electrical devices which are used on ATS diagrams and remote control.4) Functions shall be combined in a multifunction protection, measuring, signaling and communication unit.