Switchgear Specifications

PAGE NO. 1 of 29

SPECIFICATION

FOR

SWITCHGEAR, METALCLAD

3.3 kV upto 33 kV

PAGE NO. 2 of 29

TABLE OF CONTENTS

1.0 SCOPE

2.0 CROSS REFERENCES

3.0 APPLICABLE CODES AND STANDARDS

4.0 DESIGN AND CONSTRUCTION REQUIREMENTS

4.1 General

4.2 Ratings

4.3 Switchgear Assembly

4.4 Indoor Enclosure

4.5 Outdoor Enclosure

4.6 Primary Bus Conductors and Connections

4.7 Power Circuit Breakers

4.8 Low Voltage Compartment

4.9 Interface

4.10 Grounding Switch/Truck

4.11 Interlocks and Safety Features

4.12 Relays, Meters and Instruments

4.13 Instrument Transformers

4.14 DC Control Power

4.15 Wiring and Terminal Blocks

4.16 Device Identification

4.17 External Cabling

4.18 Grounding

4.19 Accessories

4.20 Nameplates

4.21 Drawings

5.0 TESTS

6.0 DATA SCHEDULE

PAGE NO. 3 of 29

1.0 SCOPE

This LCE Material Standard Specification (LMSS) specifies the minimum technical

requirements for design, engineering, manufacture, inspection, testing and performance of

indoor, 3.3 kV upto 33 kV, Metalclad Switchgear..

2.0 CROSS REFERENCES

This Material Standard Specification shall always be read in conjunction with the latest

revision of LCE General Specification No. 01-LMSS-01 titled "General Requirements for

All Equipment/Materials" which shall be considered as an integral part of this LMSS.

This LMSS shall also be read in conjunction with LCE Purchase Order or Contract

Schedules for project, as applicable.

3.0 APPLICABLE CODES AND STANDARDS

The latest revision/amendments of the following Codes and Standards shall be applicable

for the equipment covered in this LMSS. In case of conflict, the vendor/manufacturer may

propose equipment/material conforming to one group of Industry Codes and Standards

quoted hereunder without jeopardizing the requirements of this LMSS.

3.1 IEC 60044-1 Instrument Transformers, Part 1: Current

Transformers

3.2 IEC60044-2 Instrument Transformers, Part 2: Inductive Voltage

Transformers

3.3 IEC 62271-100 High Voltage Alternating Current Circuit Breakers

3.4 IEC 62271-102 Alternating Current Disconnectors (Isolators) and

Earthing Switches

3.5 IEC 60044-2 Instrument Transformers, Part 2: Inductive Voltage

Transformers

3.6 IEC 60092-201 Electrical Installation in Ships-Part 201: System

Design-General

3.7 IEC 60092-202 Electrical Installation in Ships-Part 202: System

Design-Protection

3.8 IEC 60092-504 Electrical Installation in Ships-Part 504: Special

Features-Control & Instrumentation

PAGE NO. 4 of 29

3.9 IEC 60298 AC Metal-Enclosed Switchgear and Controlgear for

Rated Voltages above 1 kV and Up to and including

72.5 kV

3.10 IEC 60529 Classification of Degrees of Protection provided by

Enclosures

3.11 IEC 60694 Common Clauses for High Voltage Switchgear and

Controlgear Standards

3.12 IEC 60947-5-1 Low-Voltage Switchgear and Controlgear, Part 5:

Control Circuit Devices and Switching Elements,

Section 1: Electromechanical Control Circuit

Devices

3.13 ANSI C37.12 AC High Voltage Circuit Breakers Rated on a

Symmetrical Current Basis - Specification Guide

3.14 ANSI/IEEE C37.09 Test Procedure for AC High-Voltage Circuit Breaker

Rated on a Symmetrical Current Basis

3.14 ANSI/IEEE C37.20.2 Metal-clad and Ship Type Cubicle Switchgears

3.15 ANSI/IEEE 45 Recommended practices for Electrical installations

on shipboard

3.16 ANSI/NFPA 70 National Electrical Code

3.17 IEEE C57.13.2 Conformance Test Procedures for Instrument

Transformers


4.1 General

The switchgear shall be of metalclad type for indoor service and shall be of

manufacturer's standard design which meets or exceeds the requirements of this

Specification in all respects.

4.2 Ratings

Ratings of the switchgear shall be as specified in Data Schedule.

4.3 Switchgear Assembly

4.3.1 The switchgear assembly shall be suitable for extension at both ends.

PAGE NO. 5 of 29

4.3.2 Each switchgear panel shall consist of compartments separated by grounded

metal partitions in conformity with relevant IEC or ANSI/IEEE Standards.

4.3.3 It shall be possible to move the circuit breaker from service position to test

position and vice versa without opening the panel front door.

4.3.4 The switchgear enclosure and the internal barriers shall be adequately rigid

and able to withstand short circuit stresses as demonstrated by test reports

of the arc-proof tests of identical switchgear units.

4.3.5 Doors and panels used to support devices shall be increased in thickness or

otherwise strengthened as necessary to support devices.

4.3.6 The switchgear shall have a bus riser transition panel with a removable

busbar link to effectively isolate the bus-tie breaker.

The removable busbar link open gap shall have a dielectric withstand

voltage at least 10% in excess of that of the switchgear. Also, sufficient

space and bare bus connectors shall be available at both sides of the busbar

link, beyond all bolted connections, to facilitate the connection of bus field

grounds and Ductor (Contact Resistance) test leads during maintenance.

4.4 Indoor Enclosure

4.4.1 The indoor metalclad switchgear shall be enclosed in a ventilated general

purpose enclosure . The degree of protection of the enclosure shall be IP41

per IEC 60529 or equivalent.

4.4.2 Each switchgear panel shall be furnished with hinged front door(s) and a

removable, bolted rear panel.

A warning sign shall be fastened by screws or rivets on each rear panel.

The sign shall be written in both Arabic and English, as follows:

" "DO NOT OPEN THIS PANEL UNLESS THE

GROUNDING SWITCH IS IN ‘ON’ POSITION".

4.4.3 The door of the low voltage compartment shall have a door stopper to hold

the door in the “open” position.

4.4.4 The enclosure design shall allow clear access to the primary cable

termination compartments only after opening the bolted panel covers. The

entry of primary cables to the enclosure shall be from the rear bottom of the

switchgear.

4.4.5 Ventilation or pressure relief openings shall be so arranged that in case of

any arcing fault inside the switchgear, the gas or vapor escaping will not

PAGE NO. 6 of 29

endanger personnel operating the switchgear and will not enter into

adjacent panels thereby preventing spreading of the fault.

All ventilation louvers shall be vermin-proof and shall be provided with

removable filters to minimize ingress of dust.


When specified in Data Schedule, an outdoor enclosure shall be provided. The

outdoor enclosure shall protect the indoor type metalclad switchgear from all

weather conditions. It shall be weatherproof and shall have a degree of protection

IP 54 per IEC 60529 or equivalent.

4.5.1 The outdoor enclosure shall be walk-in type with operating and

maintenance aisle in the front, rear and sides of the switchgear. The aisle

shall be of sufficient size to permit interchanging of removable elements.

The enclosure shall have an access door at each end equipped with safety

latches (panic hardware) to permit opening from within under all

conditions. The doors shall be provided with hydraulic door closer and shall

be key lockable.

4.5.2 The outdoor enclosure shall be supplied with double walls (with thermal

insulation in between) on the roof, doors and all sides of the enclosure. The

distance between walls shall be a minimum of 50mm. The exterior wall

shall be not less than 3mm thick steel plate and the interior wall shall be a

minimum of 1.5mm thick steel plate. The thickness may be modified to

provide equivalent strength and deflection, if approved by LCE.

4.5.3 All exposed handles, screws and hinges shall be made of non-corrosive

material or shall be hot dip galvanized or stainless steel for outdoor

locations, and cadmium or chromium plated for indoor equipment. All

bolts, nuts and washers shall be of similar type of metal.

4.5.4 The outdoor enclosure shall be supplied with adequate number of window

type air conditioners, to maintain the indoor temperature as specified in 01-

LMSS -01.

4.6 Primary Bus Conductors and Connections

4.6.1 The primary bus conductors and connections shall be made of copper and

shall be continuously rated for the site conditions and currents specified. All

busbar connections shall be silver or tin plated. Vertical sections shall be

connected to the main bus by means of busbars and not by cable

connections or vertical cable drops. All primary current carrying fasteners

shall be of non-ferrous material.

PAGE NO. 7 of 29

4.6.2 All busbars and busbar risers shall be fully insulated. Busbar connections

shall have readily removable insulating covers or molded boots.

4.6.3 In the cable compartment, insulating barriers shall be provided between

phases as well as between phases and metallic partitions of the panel. The

insulating barriers shall not obstruct termination of three-core cables.

4.6.4 For field interconnecting bus joints, appropriate insulating material shall be

supplied to insulate the bus joints. All insulating materials shall be flame

resistant, non-hygroscopic and non-tracking in the presence of corona.

4.6.5 Provision shall be made to allow for thermal expansion of the conductors

due to normal load currents and short circuit currents.

4.7 Power Circuit Breakers

4.7.1 Power circuit breakers shall be of vacuum or SF6 type, mounted on a draw-

out carriage and shall be physically and electrically interchangeable with

others of the same type and rating within the switchgear assembly.

The circuit breaker operating sequence ( operating duty cycle ) shall

be O - 0.3 s - CO - 3 min. - CO.

4.7.2 The operating mechanism shall be of the motor-charged spring-operated

stored energy type suitable for rapid/fast auto-reclosing of the circuit

breaker.

The operating mechanism shall employ a dc-motor to charge the closing

spring(s) that retains this stored energy until a closing operation is made.

The energy storage capability of the mechanism must be sufficient for an O-

CO operation at rated short circuit current or at related required capabilities

specified in Data Schedule. Recharging of closing spring shall occur

automatically as soon as the closing spring is released.

Means for manual spring charging shall be provided with the circuit breaker

both in the "Open" and "Closed" positions. The spring charging motor

circuit shall be automatically cut off during manual charging. Alternatively,

manufacturer must prove that resumption of power supply during manual

spring charging will not endanger an operator.

4.7.3 The operating mechanism shall be electrically and mechanically "trip free".

Anti-pump device shall be provided.

4.7.4 Each circuit breaker shall be provided with one (1) closing coil and two (2)

electrically independent trip coils.

4.7.5 Circuit breakers shall be designed so that they cannot be closed unless the

closing spring is fully charged. For SF6 circuit breakers, low pressure of

PAGE NO. 8 of 29

SF6 shall initiate an alarm and shall automatically block closing and

tripping of the breaker.

4.7.6 Each circuit breaker shall be provided with a visible mechanical position

indicating device. The device shall be positively driven in both directions

to show whether the breaker is in the "open" or "closed" position and shall

be color coded "Green" and "Red", respectively. Similar indicating device

shall be provided to indicate the state of the spring. It shall indicate

"SPRING CHARGED" when the spring is in a condition to close the

breaker and "SPRING DISCHARGED" when the spring is not in a

condition to close the breaker.

4.7.7 Each circuit breaker shall have a non-resettable mechanical 5-digit

operation counter which shall be readable from the front of the switchgear

with the breaker in the service position.

4.7.8 It shall be possible to test all controls and protection trip while the circuit

breaker is in the test position.

4.8 Low Voltage Compartment

The Low voltage compartment of the switchgear shall be provided, as applicable,

with the following :

4.8.1 One (1) Local/Remote selector switch

4.8.2 One (1) circuit breaker control switch. The switch shall have three

positions (trip-normal-close) with a spring return to normal and padlocking

facility in the normal position.

The control switch shall follow the convention of closing the circuit breaker

in the clockwise direction.

4.8.3 Indicator lights to indicate the breaker status as follows:

Red : breaker closed, one for each trip coil adjacent to the control

switch

Green : breaker open, one for closing coil adjacent to the control

switch

For outgoing and Ship service feeder panels only, the red and green lights

shall be wired in series with the trip and close coils, respectively to

supervise the status of each coil, in accordance with clause 4.12.7.

For incomers and bus tie breakers, the red and green light indications

shall be achieved through the breaker auxiliary switches. The healthiness

of the breaker trip coils shall be monitored via the trip circuit supervision

relays which are located in the control room.

PAGE NO. 9 of 29

4.8.4 One (1) digital power demand meter (DPDM) for each incoming and

outgoing feeder panel.

The DPDM shall have three (3) phase display for instantaneous and

maximum demand for Amperes, Volts, Watts, Vars, Watthours and

Varhours. Each quantity shall be selectable with all three phases being

selected and displayed simultaneously.

4.8.5 One (1) ammeter with a 4-position selector switch for each dedicated

Ship service transformer panel.

4.8.6 One (1) three phase current transducer or three (3) single phase current

transducers for outgoing feeder panels only.

The transducer shall have a current input of 1 or 5 A, 60 Hz, with an

output of 0 - 1mA. The accuracy shall be 0.25% or better. The

transducer full scale output shall represent 110% of the nominal current.

4.8.7 If specified in the Data Schedule, one (1) auto-reclose IN/OUT selector

switch and one (1) auto-reclose lockout reset push button shall be

provided for outgoing feeder panels only.

4.8.8 One (1) fluorescent strip light with diffuser. The light shall be controlled

by toggle or door switch. Switch shall be identified with engraved or

embossed nameplate.

4.8.9 One (1) thermostatically controlled space heater rated 220 Vac and

designed for continuous operation.

4.8.10 One (1) 15A, 230 Vac and one (1) 10A, 230 Vac flush type, parallel slot,

grounding type duplex convenient outlets shall be provided in the

incoming and bus-tie breaker panels.

4.8.11 Lot, Nameplates

4.8.12 Lot, Relays and Relay manufacturer's test blocks (see clause 4.12).

4.8.13 The bus riser/metering panel shall contain the following :

a. Bus differential protection relaying and supervision relaying with

relay manufacturer's test blocks.

b. One (1) Voltmeter with a 7-position selector switch.

c. One (1) ammeter with a 4-position selector switch.

4.9 Interface

PAGE NO. 10 of 29

4.9.1 Automatic metallic shutters with manual padlocking facilities shall be

provided to prevent access to live equipment when the circuit breaker is

withdrawn from the panel. The shutters shall open and close

automatically by means of positive drive initiated by the movement of the

breaker carriage. For maintenance purposes, opening of the individual

shutters shall be possible.

a. The busbar shutters shall be colored red and shall have white

lettering indicating “BUSBAR”.

b. The outgoing feeders shall have yellow shutters with black lettering

indicating “CABLE”.

c. The bus tie panel shutters shall be both colored red and shall

indicate “BUSBAR 1” or “BUSBAR 2”, as applicable.

4.9.2 Control wiring connections between Shipary structure and removable

element (circuit breaker) shall be provided with self-coupling contacts or

manual plug and receptacle for disconnection. The male contacts shall be

placed on the removable element while the female receptacles on the

Shipary structure.

The manual control connector shall be either interlocked or inaccessible

to prevent connection or disconnection of the control circuits when the

circuit breaker is in the service position.

4.10 Grounding Switch/Truck

4.10.1 Integral grounding switches shall be provided for incoming and outgoing

feeders and busbars, and shall be manually operated, high speed type,

having full short circuit making capability.

a. Grounding switch blades shall be directly connected to the main

grounding bus of the switchgear and not through the switchgear

metal frame.

b. Metallic linkages of the grounding switches shall be directly

connected to the main ground bus.

c. Grounding switches shall be operated from the front of the panel.

Operating handles of grounding switches shall be clearly labeled

including positive mechanical indication of "ON" and "OFF"

positions.

d. Padlocking facilities shall be provided to enable the grounding

switch to be locked in either position.

PAGE NO. 11 of 29

4.10.2 Busbar grounding may be achieved (as an option) by the use of a

grounding truck, made up of modified circuit breaker movable truck, with

all required grounding accessories. Busbar grounding shall be obtained by

closing of the grounding truck after plug-in position is made. The

grounding truck shall be permanently marked with "Busbar Grounding

Truck" for device identification.

4.11 Interlocks and Safety Features

4.11.1 The switchgear shall be provided with a system of preventive mechanical

interlocks to protect the equipment, operator and service personnel from

the dangers of mal-operation. The interlocks shall be designed to prevent:

a. A closed circuit breaker being inserted into or withdrawn from the

service position.

b. A circuit breaker being closed in other than the service, test or

withdrawn positions.

c. A circuit breaker being placed in the service position if the

secondary contacts plug has not been fitted.

4.11.2 Means shall be provided for positively holding the removable element in

place when it is either in the service or test position. If a separate

withdrawn position is provided with the door closed, removable element

shall be positively held in this position.

4.11.3 It shall not be possible to withdraw the breaker from its housing beyond

test position unless the spring stored energy mechanism is automatically

or manually discharged. In case of manual discharge, appropriate

warning plate shall be provided to caution the operator to manually

discharge the spring.

4.11.4 Grounding switches shall be mechanically interlocked with associated

incoming or outgoing breaker such that grounding switch cannot be

closed unless the breaker is withdrawn from service position and that the

breaker cannot be inserted in service position unless grounding switch is

open.

4.11.5 Grounding switch of an incoming transformer line shall also be

interlocked with transformer HV breaker or transformer HV disconnect

switch such that grounding switch cannot be closed unless HV breaker or

HV disconnect switch is open and HV breaker cannot be closed unless

grounding switch is open.

4.11.6 Busbar grounding switch shall be interlocked with the incoming circuit

breaker and bus section breaker as well as with all outgoing breakers on

the respective bus side, such that the grounding switch cannot be closed

PAGE NO. 12 of 29

unless all associated circuit breakers are open and withdrawn from service

position, and the associated circuit breakers cannot be closed unless the

busbar grounding switch is open.

4.11.7 The busbar grounding truck, when used, shall be so interlocked such that

grounding of the busbar shall not be possible unless the associated

incoming and bus section breaker(s) as well as all the outgoing feeder

breakers are open and withdrawn from service position. Manufacturer

shall provide evidence in support of this arrangement.

4.12 Relays, Meters and Instruments

4.12.1 Relays, meters and instruments shall be provided as specified in the

Project Scope of Work and shall be located on a separate low voltage

compartment of each switchgear panel.

4.12.2 All protective relays shall be mounted in 19 inch racks. If relays cannot

be rack mounted they may be flush mounted.

All meters shall be switchboard fixed-type and flush or semi-flush

mounted.

4.12.3 Target indicators shall be provided on all relays performing protective or

tripping functions. Relay contacts shall be self-aligning.

4.12.4 Meters, instruments and indicating type transducers shall have test

facilities separate from protection, so that testing and calibration can be

done without equipment outages. Test facilities shall be similar in

function to type FT-1 test switches and shall be mounted on the front

panel.

4.12.5 Upper edge of protective relays and meters shall be no higher than 2.2m

to allow convenient maintenance, inspection, target reset, and testing

from ground level.

4.12.6 All accessories such as DC/DC converters and transducers shall be

located inside the panel.

4.12.7 For outgoing and Ship service feeder panels, each indicating light shall

have a current limiting resistor to facilitate replacing the bulb without

activating the respective trip/close coil. The rating of the resistor shall be

selected to provide adequate illumination of the lamp at normal operating

conditions.

Shorting of the lamp terminals shall not damage the resistor itself or blow

the control circuit fuses (or trip the control circuit MCBs) considering that

maximum DC control voltage is limited to 110% of its nominal rating.

PAGE NO. 13 of 29

This shall be met by restricting the current passing through the trip coil to

less than 25% of its minimum pick-up current.

Alternatively, LED indicators may be provided.

The trip 1, trip 2, close and spring charge circuit MCBs shall be located at

the switchgear in the LV compartment

All switchgear MCBs shall have normally open auxiliary contacts. Each

breaker shall have its MCB contacts connected in series with the Trip

Circuit 1 positive supply located on that breaker. Any MCB operation

shall de-energize the breaker DC supervision relay and provide an alarm.

4.13 Instrument Transformers

4.13.1 Current transformers (CTs) shall be installed on both bus and cable sides

of circuit breakers.

4.13.2 The mechanical and thermal current ratings of CTs shall be coordinated

with the momentary and short circuit current of the associated circuit

breaker, respectively.

4.13.3 The secondary windings of each CT shall be rated as specified in Data

Schedule, and shall be grounded at one point only.

4.13.4 CTs for busbar differential and restricted earth fault (REF) relays shall be

of single-ratio type. Other relaying CTs shall be of dual-ratio type.

Metering CTs shall be of single-ratio type.

Relaying and metering accuracy class for standard burdens shall be as

specified in Data Schedule.

4.13.5 The looping of feeder cables or secondary conductors through the window

of window type CTs is not acceptable.

4.13.6 Voltage transformers (VTs) shall be of standard two (2)-winding type for

the voltage class of the switchgear and shall have voltage marked ratio

and accuracy class for standard burden as specified in Data Schedule.

4.13.7 Drawout carriage for VT and associated fuses shall be located in an easily

accessible place.

4.13.8 Primary circuits of all VTs shall include current- limiting fuses. These

fuses shall be mounted in such a way that they must be disconnected from

the primary circuit before access can be obtained.

Secondary circuits of all VTs shall be protected by withdrawable fuses or

their equivalent.

PAGE NO. 14 of 29

4.13.9 Provisions shall be made for disconnecting the secondary circuit of VT

when the primary circuit is disconnected. Provision shall also be made for

momentary grounding of the primary winding and current limiting fuses

during the disconnecting operation to remove any charges from the

windings.

4.14 DC Control Power

Unless otherwise specified, the nominal DC control voltage for closing and

tripping of all circuit breakers shall be 110 Vdc supplied from Ship batteries. Trip

coils shall operate satisfactorily between 88 Vdc and 121 Vdc and closing coils shall

operate satisfactorily between 93.5 Vdc and 121 Vdc.

Voltage dropping resistors shall not be used in the trip coil and closing coil circuits.

4.15 Wiring and Terminal Blocks

4.15.1 All wiring within the switchgear shall be installed and tested at the

factory unless otherwise specified. All wiring shall be heat and flame

retardant, rated 90°C maximum operating temperature, type SIS as listed

in ANSI/NFPA 70 or approved equivalent, rated 600/1000V, with

insulated, tinned, stranded annealed copper conductor, and shall not be

smaller than 2.5 mm². All CT secondary related circuits shall not be

smaller than 4mm².

For the wiring of solid state devices, smaller size wires may be acceptable

up to the first termination point, only if the associated device cannot

accommodate larger wire sizes.

All wires shall be adequately rated for thermal withstand of short circuit

currents, in accordance with back-up tripping time.

4.15.2 Color coding of panel wiring shall be as follows :

DC circuits : Grey (Trip circuits shall be provided with red

ferrule at the terminal block)

VT circuits : Red

Alarm circuits : Blue

CT circuits : Yellow

AC power circuits : 4 Core : Red, Yellow, Blue, Black

(Neutral)

PAGE NO. 15 of 29

3 Core : Red, White or Yellow, Blue

for 3 phase

3 Core : Red, White or Yellow, Black

(Neutral) for 2 phase

2 Core : Red, Black (Neutral)

1 Core : Black

1 Core : (Usage limited to grounding

conductor)

Green or Green with Yellow

stripes

4.15.3 All wiring shall be made without splices. The control wires shall be

multi-stranded flexible and shall be terminated with size 1 hooked crimps

or ring type terminals. Spade type or boot lace type crimps shall not be

used.

4.15.4 Terminal blocks shall be spring loaded type with screw termination for

size-1 hooked type crimps. If a common termination is required between

terminal blocks, preformed wire jumpers or manufacture’s own shorting

bar can be used. Compatible end stops, end plates, barriers and terminal

block identifiers shall be used. Groups of terminal blocks shall be

identified using engraved labels.

In special circumstances where wire sizes exceed the terminal block

capability, correctly sized terminal blocks shall be used after LCE

approval.

In all instances, terminal blocks shall be mounted on DIN rails. The DIN

rails shall be mounted on the bottom and sides of the panel at an angle of

45 degrees towards the front of the panel. If front access only is

applicable, then the blocks shall be angled towards the front of the panel.

4.15.5 Terminal blocks shall be grouped according to function, i.e. Power

Supplies (AC or DC), VT, CT, DC controls, annunciation, SCADA etc.

The function shall be labeled accordingly. Terminal blocks for different

voltages (AC/DC) shall be located on separate DIN rails.

4.15.6 The CT terminal blocks at the first accessible point of termination shall

have shorting and grounding facilities by means of a copper bar with

shorting screws similar or equivalent to the G.E. terminal board type

EB27B06SC or Entrelec M10 arrangement.

Each CT circuit shall be provided with a disconnectable ground link.

Opening of the link shall enable all CT and relay wiring to be tested clear

PAGE NO. 16 of 29

of ground. There shall be only one ground link per CT circuit. The

termination between the ground busbar and the isolatable link shall be

numbered C90 for Overcurrent CT, M90 for Metering CT, B90 for Bus

Differential and D90 for Remote Tap Charger Control (RTCC)

overcurrent block applications.

CT terminals shall be grouped by function and then sub-grouped by

phase. Each phase shall be labeled by appropriate labels attached to the

terminal blocks. Each complete CT shall be identified by function and

reference number. Where a CT has a dual ratio using secondary tappings,

such as S1, S2, S3; the CT terminal block shall have four (4) terminals :

S1, S2, S3 and ground.

The shorting bar shall cover the four terminals of each phase. The bar

shall be grounded through the grounding terminal block. The other end of

the bar shall be held by an insulated screw.

Adjacent to the CT terminal blocks, shall be located two end stops with

an appropriate label mounted between them. Each stop shall have formed

holes that shall be used to store the CT shorting screws.

If the GE type CT terminal blocks are used, the covers shall be retained

and the CT identification shall be marked on the cover.

4.15.7 All VT circuits shall be provided with sliding link type terminal blocks to

facilitate isolation of VTs from the circuit to perform voltage injection

tests. These terminal blocks shall be clearly marked with phase, function,

core number and ratio.

4.15.8 All tapping of dual-ratio CTs shall be terminated at the terminal blocks

which shall be clearly marked to designate the CTs phase and ratio in use.

4.15.9 Not less than ten percent (10%) spare terminals shall be provided on each

terminal block.

4.15.10 All spare contacts from protective relays or tripping relays shall be wired

to the terminal blocks for future use. At least two (2) spare (2 NO + 2

NC) contacts of lockout relay shall be wired to the terminal block for

future use.

4.15.11 All wiring internal to the switchgear assembly shall be laid in accessible

wiring troughs throughout the entire length of the switchgear assembly.

Internal wiring between the breaker and the LV compartment shall be

bundled and neatly formed. There shall be no wiring run as single cores

through grommets. The AC wiring shall be bundled separately from DC

wiring in the same raceway. Signaling cables shall be shielded type and

run in a separate raceway and shall be separated as far as practical from

PAGE NO. 17 of 29

all LV power cables and at right angle to such wiring when the spacing is

less than 300 mm.

4.15.12 Cable supports shall be provided for wiring run directly to instruments or

devices. Wiring extensions from raceways or bundles to instruments and

devices shall be neatly formed, securely tied or clamped and supported to

the switchgear framework. Bends in the wiring shall be carefully made in

such a manner that the insulation is not damaged.

4.15.13 Wiring for lights, space heaters and convenience outlets may be run in the

same raceway in individual panels and in rigid or PVC jacketed flexible

conduits between panels. Wiring of meters/relays mounted on doors shall

be mechanically protected.

4.15.14 All internal wiring terminations shall be identified by legible markings at

the device terminals. Each end of every wire leaving a terminal block

shall be identified indicating local termination point and destination as

per Figure 1. All internal wiring shall have identification showing both

locations of termination at each end of the wire. Markers shall be of

ferrule type, permanently marked and shall be made of material that will

not deform or deteriorate and shall withstand a temperature of 90°C.

Adhesive type terminal markers are not acceptable.

4.15.15 Where panels are to be shipped in sections and assembled in the field, the

wiring between sections shall be provided preformed. One end of the

wire shall be terminated on terminal block and the other end shall be

bundled and tagged properly.

4.16 Device Identification

4.16.1 Appropriate identification in the form of engraved or embossed nameplate

shall be provided on each instrument, relay, control/test switch and other

devices. These nameplates shall be made of non-corrodible material and

shall be of appropriate size.

4.16.2 Each device shall be permanently identified to correspond to the device

identification symbol utilized on the wiring diagrams. This identification

shall be adjacent to the terminals of the device. Standard relay device

numbers shall be provided for protective relays.


4.17.1 Power Cables

a. Provisions shall be made for the connection of all power cables

including proper terminal connectors or lugs, clamps, or

terminations. The location of the power cable connections shall be

arranged to (i) ensure that cable entry is exactly below the

PAGE NO. 18 of 29

termination point and (ii) provide adequate vertical space, with a

minimum of 700 mm, for training incoming cables from conduit

entry to connectors and to provide adequate space for cable

termination devices.

In case an extension box is required to meet the vertical space

requirement, the extension box shall be a part of the switchgear

supply. It shall be made of Al and shall be manufactured and

supplied by the switchgear manufacturer.

The bottom plate for outgoing feeder panels shall be of two pieces

with holes drilled for entry of cable and shall be provided with

clamps as specified in clause 4.17.1 (b) below. The bottom plate for

incoming and Ship service transformer panels shall be of a single

piece without any holes drilled.

b. Terminal lugs for power cables shall be suitable for use with copper

or aluminum conductor material.

Adequate structural supports (including clamps for 1-3/C x 300mm²

aluminum conductor, XLPE cable) for outgoing feeder terminations

shall be provided even when such terminations are provided by

others.

The cable termination compartments shall be designed to accept

heat shrinkable cable terminations. The boots over the cable

terminals, if required, shall also be of heat shrink or molded PVC

type.

c. All terminal lugs for power cables shall be of bolted type with two

crimping elements per lug.

Terminals for conductors 400mm² and larger shall be suitable for 4-

hole NEMA pad, 12mm (1/2 in.) stud. For conductors smaller than

400mm², terminals shall be suitable for 1-hole NEMA pad, 12mm

(1/2in.) stud.

4.17.2 Control Cables/Wires

a. All external control cables/wires shall be brought to the panel from

the bottom, unless otherwise specified.

b. Control cables/wires shall enter the panel through suitable cable

glands to prevent contact with sharp metal edges. The gland-plate

assembly shall be vermin proof.

PAGE NO. 19 of 29

4.18 Grounding

4.18.1 A copper grounding bus sized for the rated short circuit current and

running the entire length of the switchgear assembly shall be provided.

4.18.2 Two (2) solderless type ground connectors shall be provided on the

ground bus, one on each end section of the bus. The ground connectors

shall be suitable for a bare copper ground conductor 120mm² thru

240mm².

4.18.3 All hinged doors and panels shall be properly bonded by unspliced

flexible wire or 10mm2 Cu braids.

4.18.4 All devices or equipment shall be grounded as required. Each grounding

connection to the ground bus shall be arranged so that each may be

disconnected without disturbing the continuity of the ground bus or any

other ground connection.

4.18.5 Drawout carriage of all removable elements shall have a direct ground

connection with the switchgear ground bus through suitable flexible or

pressure contact type connections designed to carry the rated fault current

for the rated duration.

4.19 Accessories

The following accessories shall be supplied as applicable :

4.19.1 One handling device or its equivalent for removing each size of circuit

breaker from the switchgear assembly, which shall be capable of putting

the circuit breaker on the floor.

4.19.2 A set of each relay manufacturer’s test plugs accessories for meter and

relay testing.

4.19.3 Portable device for racking circuit breaker from one position to the other:.

two such devices when one line-up of switchgear is supplied, one device

per line-up if more than one line-up is supplied.

4.19.4 A set of test jumper cables (one for each line-up of switchgear) or

equivalent with appropriate end fittings to permit connections of all

secondary control contacts for test of the circuit breaker in the withdrawn

position. The test jumper cables shall be long enough to permit testing

when the breaker is completely removed from the panel.

4.19.5 A lever or equivalent device for manually charging the spring-operated

stored energy closing mechanism of the circuit breaker.

4.19.6 Any special tools required for circuit breaker maintenance and relay

adjustments.

PAGE NO. 20 of 29

4.20 Nameplates

4.20.1 The switchgear assembly shall have a "Danger High Voltage" warning

sign written in Arabic and English.

4.20.2 Switchgear assembly shall also bear a nameplate permanently and legibly

marked in English with the information in accordance with IEC 60298

or equivalent ANSI Standards, plus the following additional information:

a. LCE Purchase Order Number or Contract Number or J.O. Number

4.20.3 Each circuit breaker shall have a nameplate as per IEC 60056 or

equivalent ANSI/IEEE Standards.

4.20.4 The circuit breaker operating mechanism, CTs, VTs and FT-1 switches

shall also bear nameplates.

Each FT-1 switch shall have a separate nameplate of dimensions 160mm

by 44mm.

4.20.5 The nameplate for the switchgear assembly and the circuit breakers shall

be made of stainless steel. The nameplate shall be fastened by stainless

steel screws or rivets. Other nameplates for CTs, VTs etc. may be made

of non-corrodible material other than plastic.

4.21 Drawings

The switchgear manufacturer shall supply the following size A drawings as a

minimum:

a. General Arrangement and Equipment List of Breaker

b. AC Schematic

c. DC Schematic

d. Panel Wiring Diagram

e. Bus Wiring Diagram

5.0 TESTS

5.1 All equipment shall be tested in accordance with the latest applicable IEC or

ANSI/IEEE Standards.

5.1.1 Type (Design) Tests

a. All type tests prescribed in the applicable IEC or ANSI/IEEE

Standards shall be performed on the first unit of every new design,

PAGE NO. 21 of 29

rating or size of the corresponding equipment to be supplied to

LCE, in accordance with the table below.

b. Arc-proof test shall also be performed, if requested, on an identical

switchgear panel in accordance with annex AA of IEC 60298 or

equivalent.

c. Certified test reports of type tests performed on identical equipment

acceptable to LCE may be submitted for review and acceptance in

lieu of the required type tests above.

5.1.2 Routine (Production) Tests

a. All routine tests prescribed in the applicable IEC or ANSI/IEEE

Standards shall be performed on the corresponding equipment in

accordance with the table below.

b. Routine tests shall be performed on all circuit breakers, instrument

transformers and grounding switches.

c. Timing tests are required on all circuit breakers.

5.2 Tests for relays, meters and instruments may comply with the manufacturer's

standard tests. Relay circuits shall be tested with simulated fault currents for proper

operation.

EQUIPMENT APPLICABLE STANDARD

Complete Switchgear Assembly IEC 60298 or ANSI/IEEE C37.20.2

Circuit Breakers IEC 60056 or ANSI/IEEE C37.09 and

ANSI/IEEE 45

Instrument Transformers IEC 60044-1 and IEC 60044-2 or IEEE

C57.13.2

Grounding Switches IEC 62271-102

PAGE NO. 22 of 29

6.0 DATA SCHEDULE

METALCLAD SWITCHGEAR , 3.3 kV upto 33 kV

Enquiry Quotation No. Date

Purchase Order No. Date

or Contract No.

Project title with J.O. No.

REFERENCE

SECTION NO. DESCRIPTION 'A' 'B' 'C'

3.0 APPLICABLE INDUSTRY

STANDARD *


4.1 General

Switchgear Model Designation *

No. of Panels for

- Incoming Feeders

- Outgoing Feeders

- Bus tie Breaker(s)

- Bus Riser/Metering

- Ship Service Transformer

Dedicated Feeder(s)

'A' - LCE SPECIFIED DATA/PARAMETERS

'B' - BIDDER/SUPPLIER/VENDOR/CONTRACTOR PROPOSED DATA/PARAMETERS

'C' - REMARKS SUPPORTING THE PROPOSED DEVIATION IN COLUMN 'B'

(*) - DATA/PARAMETER TO BE PROVIDED/PROPOSED BY THE BIDDER/

SUPPLIER/VENDOR /CONTRACTOR IN COLUMN 'B'.

PAGE NO. 23 of 29

6.0 DATA SCHEDULE

METALCLAD SWITCHGEAR , 3.3 kV upto 33kV

REFERENCE


4.2 Ratings

Nominal Voltage (kV)

(3.3kV, 6.6kV, 11kV or 33kV)

Maximum Voltage (Emergency

conditions) (kV) 1.05 Un

Impulse Withstand Voltage (kV)

One Minute Power Frequency

Withstand Voltage (kV)

Rated Continuous Current of:

- Incomer Circuit (A)

- Bus Tie Circuit (A)

- Outgoing Feeder Circuit(A)

- Main Busbar (A)

Rated Symmetrical Interrupting

Current at Nominal Voltage (kA)

PAGE NO. 24 of 29

6.0 DATA SCHEDULE


REFERENCE


Rated Short-time Current(kA)

Short-time current Duration *

Rated Peak Making/Withstand

Current (kA)

First Pole To Clear Factor 1.5

Rated Interrupting Time

of C.B. (Cycles/msec) 5/80

Closing Time (max) of C.B.

(Cycles) *


Is outdoor enclosure required ? Yes/No

4.8.7 Auto-reclosing Required

for Outgoing Feeders? Yes/No

4.8.8-10 Rated Voltages And Power of Accessories

i. Light Points (Vac) 230

Power (Watts) *

ii. Space Heaters (Vac) 230

Power (Watts) *

iii. Receptacles (Vac) 230

PAGE NO. 25 of 29

6.0 DATA SCHEDULE


REFERENCE


4.12 & 4.13 Instrument Transformers, Relays, Meters and Instruments

(Specify and provide a complete List of the required instrument transformers, relays,

meters, and instruments and/or a relaying and metering one-line diagram).

i. Rated Current of CT

Secondary (A) 5

ii. CT Continuous Thermal Rating (%)

- Single ratio CT 120

- Dual ratio CT 150

iii. CT Ratio(s)

- Incomer Circuit 400/5

- Bus Tie Circuit

- Outgoing Feeder Circuit

- Protection 400/5

- Metering 400/5

- Ship Transformer

- Busbar Differential

- Restricted Earth Fault

iv. CT Burden(s)

- Incomer Circuit *

- Bus Tie Circuit *

- Outgoing Feeder Circuit *

v. Relaying Accuracy Class(es)

- Incomer Circuit

- Bus Tie Circuit


PAGE NO. 26 of 29

6.0 DATA SCHEDULE


REFERENCE


vi. Metering Accuracy Class

(0.5 per IEC or 0.3 per ANSI)

vii. Rating of Current Limiting

Fuse on VT Primary (A) 3

viii. VT Secondary Voltage (V) 110/3

& Extended tap Voltage (V) Not required

ix. VT Voltage Marked Ratio

x. VT Burden *

xi. VT Accuracy Class 0.5/3P

4.14 Rated Control Voltages and Currents

i. Breaker Charging Motor (Vdc) *

and Current (A) *

ii. Breaker Closing Coil (Vdc range) *

and Current (A) at rated voltage *

iii. Breaker Tripping Coil

(Vdc range) *

and Current (A) at rated voltage *


(External cables are to be provided by the main Contractor)

i. Power Cable Details:

- Type of insulation

- Voltage class (kV)

PAGE NO. 27 of 29

6.0 DATA SCHEDULE


REFERENCE


ii. Conductor Size for Power Cables:

- Incomer Circuit (mm²)

- No. of cables/phase


(mm² )


No. 1 (mm²)


No. 2 Cum-outgoing

feeder (mm²)

RECOMMENDED CLEARANCES

i. Front (mm) *

ii. Rear (mm) *

PANEL DESCRIPTION

a. Incoming Feeder Panel

i. Panel Dimensions

(H x D x W) (mm) *

ii. Panel Weight (kgs.) *

PAGE NO. 28 of 29

6.0 DATA SCHEDULE


REFERENCE


b. Outgoing/Ship Service Transformer Feeder Panel

i. Panel Dimensions

(H x D x W) (mm) *


c. Bus tie Panel

i. Panel Dimensions

(H x D x W) (mm) *


d. Bus Riser/Metering Panel

i. Panel Dimensions

(H x D x W) (mm) *


PAGE NO. 29 of 29

6.0 DATA SCHEDULE


A. ADDITIONAL TECHNICAL INFORMATION OR FEATURES REQUIRED

B. ADDITIONAL SUPPLEMENTARY DATA OR FEATURES PROPOSED BY

BIDDER/VENDOR/SUPPLIER/CONTRACTOR :

C. OTHER PARTICULARS TO BE FILLED UP BY BIDDER/VENDOR/SUPPLIER/

CONTRACTOR :

Manufacturer Vendor/Supplier/

of Material/Equipment Contractor

Name of Company

Location and Office Address

Name and Signature of Authorized

Representative and Date

Official Seal/Stamp

of the Company

Switchgear Specifications

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Transcript of Switchgear Specifications