SECTION - 4
SPECIFICATION
FOR
33KV & 11KV SWITCHGEARS
C O N T E N T S
DESCRIPTION
PAGE NO.
1.0 INTENT OF SPECIFICATION... 3
2.0 CODES AND STADARDS... 3
3.0 EQUIPMENT AND SERVICES TO BE FURNISHED UNDER THIS SPECIFICATION3 4.0 SITE CONDITIONS... 3
5.0 DESIGN CRITERIA... 4
6.0 SPECIFIC REQUIREMENTS... 5
7.0 TESTS ... 10
8.0 DRAWINGS, DATA & MANUALS... 11
9.0 SPARES ... 12
10.0 ANNEXURE-A: RATINGS AND REQUIREMENT... 13
11.0 ANNEXURE-B: BILL OF MATERIALS... 15
SPECIFICATION
FOR
33KV & 11KV SWITCHGEARS
1.0
INTENT OF SPECIFICATION
This specification is intended to cover the design, manufacture, assembly, testing at manufacturer's works, supply & delivery, properly packed for transport of 33kV Switchgear & 11kV Switchgear complete with all accessories and auxiliary equipment for efficient and trouble-free operation.
2.0
CODES AND STADARDS
The equipment to be furnished under this specification shall, unless otherwise stated, be designed, constructed and tested in accordance with the applicable sections of the latest revision of relevant International Electrotechnical Commission (IEC) publication.
3.0
EQUIPMENT AND SERVICES TO BE FURNISHED UNDER THIS SPECIFICATION
3.1 Two(2) sets of 33 kV Switchgear Line-up as per Single Line Diagram.3.2 One (1) set of 11 kV Switchgear Line-up as per Single Line Diagram. 3.3 One(1) set of earthing truck for 11 kV bus side earthing.
3.4 Spare parts.
3.5 All relevant drawings, data and instruction manuals.
4.0
SITE CONDITIONS
For the purpose of equipment design, the following data shall be taken into consideration: Site elevation above mean sea level : ≤ 1000m
Ambient air temperature
§ Highest max (in shade) for about : 55°C 6 hours a day
§ Lowest minimum : (-)10°C § Max yearly average : (+)30°C § Max daily average : (+)40°C § Maximum relative humidity : 92% at 40°C § Seismic zone : (data not available)
§ Sand storm : Subjected to strong and frequent sand storm
5.0
DESIGN CRITERIA
5.1 The 33kV & 11kV switchgears will be used to supply power to various distribution circuits, as well as nearby localities through 33kV & 11kV line feeders & transformer feeders.
5.2 The switchgears will be located indoors in a clean but hot, humid and tropical atmosphere. 5.3 For continuous operation at specified ratings, temperature rise of the various switchgear
components shall be limited to the permissible values stipulated in the relevant standards and/or this specification.
5.4 The switchgears and their components thereof shall be capable of withstanding the mechanical forces and thermal stresses of the short circuit current of the system without any damage or deterioration of material.
5.5 Each substation will have two (2) 33kV Incomer circuit breakers. Before each circuit breaker, one set of 3-phase off-load Isolator will be provided for isolation and ease of maintenance. These Isolators will be mounted inside panels and mechanically interlocked with corresponding Circuit Breakers so that isolators could not be operated when the breaker is in Service. Breakers will have built-in earthing arrangement. As soon as the breakers are withdrawn, corresponding cable terminals will be earthed. Rating of the isolators will be same as the breaker. These two breakers will directly feed power to HV sides of two 33/11.5kV transformers. The 11kV switchgears shall have two incoming and one bus-coupler circuit breaker feeders. Each incoming feeder shall be rated to feed entire load of the switchgear. Under normal condition, two incoming feeders of the switchgear shall operate independently with bus coupler open. There shall be provision for manual/auto changeover of the supply from one incomer to the other through trip selector switch and under voltage relays. In addition provision shall be made to run both the source in parallel at 11 kV.
5.6 The ratings of all equipment including bus bars of the switchgears shall be as shown in the attached single line diagrams. Each incoming feeder shall be rated to carry continuously 110 percent of rated secondary current of the transformer feeding the switchgear. The rating of the bus coupler feeder shall be equal to the rating of the incoming feeder.
5.7 11kV outgoing breakers shall be suitable for switching oil filled type L.T. transformers both under loaded and unloaded conditions as well as feed power through long lines (partially cables & OHL conductors).
When switching inductive and capacitive currents, the over voltages produced on any switching duty shall be less than 2.5 p.u. Where the switching over voltages exceed 2.5 p.u., the manufacturer shall provide appropriate metal oxide surge arresters on both cable and bus bar sides of the circuit breaker, on each circuit to protect the system at no extra cost to the customer. These surge arresters shall be mounted inside the panel.
5.8 Equipments, accessories and devices covered in this specification shall meet the requirements of the referenced IEC or other international standards.
5.10 The low voltage section shall be arranged with a barrier so that it can be entered with the contactor energized without exposing personnel to high voltage.
5.11 33 kV & 11 kV switchgears shall be suitable for withstanding internal arc faults in line with IEC 60298, Clause 5.101.4.
5.12 The switchgear shall be designed for a service life of at least 30 years in the environment for the duty specified on the data sheets.
6.0
SPECIFIC REQUIREMENTS
6.1 Construction
6.1.1 The switchgear panels shall be indoor, metal-clad, floor mounted, drawout type. Design and construction shall be such as to allow extension at either end.
6.1.2 The switchgear enclosure shall conform to the following degree of protection as per IEC 60529:
For covers : IP33
For bus bar, cable and breaker : IP 54
For instruments : IP50
The minimum thickness of sheet steel used shall be 2 mm.
6.1.3 The switchgear assembly shall comprise of a continuous, dead-front, line-up of free standing, vertical cubicles. Each cubicle shall have a front-hinged door with latches and a removable bolted back cover. All covers and doors shall be provided with neoprene gaskets. Each cubicle shall have suitable lifting device.
6.1.4 Switchgear cubicle shall be so sized as to permit closing of the front access door when the breaker is pulled out to TEST position. The working zone at the front of cubicle shall be restricted within 750 mm to 1800 mm from floor level.
6.1.5 Circuit breakers, instrument transformers, bus-bars, cable compartment etc., shall be housed in separate compartments within the cubicle. The design shall be such that failure of one equipment shall not affect the adjacent units.
6.1.6 All relays, meters, switches and lamps shall be flush mounted on the control cabinet built on the front of the cubicle.
6.1.7 For easy maintenance, the width of the panel shall not be less than 800mm. 6.2 Bus and Bus Taps
6.2.1 The main buses and connections shall be of copper, sized for specified current ratings with maximum temperature limited to 90°C (including ambient of 40OC).
6.2.2 Busbars and connection shall be fully insulated for working voltage with adequate phase/ground clearances. Insulating sleeves for busbars and cast-resin shrouds for all joints and tap-offs shall be provided.
6.2.3 All buses and connections shall be supported and braced to withstand stresses due to maximum short circuit current and also to take care of any thermal expansion.
6.2.4 Busbars shall be colour coded for easy identification and so located that the sequence R-Y-B shall be from left to right, top to bottom or front to rear, when viewed from front of the switchgear assembly.
6. 2.5 The busbar chamber shall be provided with interpanel barrier with epoxy cast seal-off bushings through which the buses will pass through so as to prevent propagation of fire from one panel to another.
6.3 Circuit Breaker
6.3.1 Circuit breakers shall be triple pole, single throw, Vacuum type.
6.3.2 Circuit breakers shall be drawout type, having SERVICE, ISOLATED and EARTHED positions with positive indication for each position.
6.3.3 All 33 kV and 11 kV circuit breakers shall have motor wound spring charged trip free mechanism with antipumping feature, with provision for high speed auto-reclosing and shunt trip. In addition, facility for manual charging of spring at any breaker position shall be provided.
6.3.4 For motor wound mechanism, spring charging shall take place automatically after each breaker closing operation. One open-close-open operation of the circuit breaker shall be possible after failure of power supply to the motor. A visual mechanical indicating device will also be provided to show the position of the spring.
6.3.5 Interlock arrangements shall be as stated in clause 5.11 of IEC 62271 – 200. Mandatory interlocks shall be mechanical
Mechanical safety interlock shall be provided to prevent :
a) The circuit breaker from being racked in or out of the service position when the breaker is closed.
b) Racking in the circuit breaker unless the control plug is fully engaged.
6.3.6 Automatic safety shutters shall be provided to fully cover the female primary disconnects when the breaker is withdrawn.
6.3.7 Each breaker shall be provided with an emergency manual trip, mechanical ON-OFF indication, an operation counter and mechanism charge/discharge indicator.
6.3.8 Control voltage shall be 110V DC.
6.3.9 Breakers shall be suitable for high speed auto reclosing capbility
6.4 33kV Isolator
6.4.3 Isolators shall be mechanically & electrically (wherever possible) interlocked with circuit breakers in order to avoid operation of Isolators when the CB is closed.
6.4.4 Each breaker will be provided with suitable cable side earthing truck or built-in earthing arrangement.
6.5 Control & Indication
The circuit breaker shall be wired up for local & remote operation through SCADA system. Each breaker cubicle shall be equipped with following :
6.5.1 One control cabinet, mounted on top of breaker cabinet, provided with suitable anti-vibration facilities. One (1) TEST-NORMAL and LOCAL-REMOTE stayput type selector switch with pistol grip handle and key interlock.
6.5.2 Two (2) heavy duty oil tight, push buttons for TRIP & CLOSE. TRIP Push button shall be shrouded type to prevent accidental operation.
6.5.3 Nine (9) indicating lights on front of compartments :
GREEN : Breaker Open
RED : Breaker Closed
AMBER : Auto Trip
WHITE : Spring charged BLUE : Trip Circuit Healthy
RED & GREEN : Earth Switch Closed & Open YELLOW & BLUE : Breaker Test & Service Position
6.5.4 Lamps shall be low watt LED Cluster type. Lamp and lens shall be replaceable from the front. 6.5.5 A common audible alarm for each switchgear line-up shall be provided to alert the operator that
circuit breaker has tripped. Means shall be provided for silencing the audible alarm whilst leaving it free to sound when any other alarm is initiated but the associated alarm indications shall continue until cancelled.
6.6
Current Transformer6.6.1 Current transformers shall be cast resin type. All secondary connections shall be brought out to terminal blocks where wye or delta connection will be made. The CT secondary shall be rated for 1A (for relays) and 5A (for metering).
6.6.2 Accuracy class of the Current Transformers shall be : a) Class PX for differential relaying.
b) Class 5P20 for other relaying c) Class 1.0 and ISF <5 for metering.
6.6.3 Other particulars of the CTs viz. ratio, burden, knee point voltage, excitation current and secondary resistance shall be as shown in SLD.
6.7.1 Voltage Transformers shall be cast-resin, drawout type and shall have an accuracy class of 1.0. Voltage Transformer mounted on breaker carriage is not acceptable.
6.7.2 High voltage windings of voltage transformer shall be protected by current limiting fuses. The voltage transformer and fuses shall be completely disconnected and visibly grounded in fully draw-out position.
6.7.3 On low voltage sides, MCBs will be provided to prevent overload.
6.8 Relays
6.8.1 Main power circuit Relays shall be static/digital/numeric type, of drawout design with built-in testing facilities, having provision for remote communications. Small auxiliary relays may be electro-mechanical in non-drawout execution and mounted within the cubicle.
6.8.2 Relays shall be rated for operation on 110V secondary voltage and 1A secondary current. Number and rating of relay contacts shall be as required.
6.8.3 The Bidder shall furnish, install & co-ordinate all relays to suit the requirements of protection, interlock and bus transfer schemes.
6.8.4 The protection equipment offered shall have proven field experience and similar site condition as stated under clause 4.0.
6.9 Meters and Meter Selector Switches
6.9.1 Indicating instruments (96 x 96 mm) shall be switchboard type, with 240 Deg. scale, anti-glare glass and accuracy class of at least 0.5% full scale. Each meter shall have zero adjuster on the front. Meters shall have black marking on a white scale face.
6.9.2 All 33kV and 11kV incoming and outgoing feeders will be provided with a Digital type Multi-function Meter, capable of measuring and digitally displaying the following parameters: kW, kWH, kVAr, kVArH, A, V, pf, frequency. Each meter will be provided with at least two output signals of 4-20mA and communication port (RS 232 or RS 485) for all the above parameters for use in SCADA. 6.9.3 Meter selector switches shall be maintained contact, stay put type with knob handle. Ammeter
selector switches shall be four-position type having make before break contacts to prevent open circuits of CT secondaries.
6.10 Secondary Wiring
6.10.1 The switchgear shall be fully wired at the factory to ensure proper functioning of control, protection, transfer and interlocking schemes.
6.10.2 Fuse and links shall be provided to permit individual circuit isolation from bus wires without disturbing other circuits. All spare contacts of relays, switches and other devices shall be wired upto terminal blocks.
6.10.3 Wiring shall be done with flexible, 600V grade, PVC/PE insulated switchboard wires with stranded copper conductors of 2.5 Sq.mm.
6.10.4 Each wire shall be identified, at both ends, with permanent markers bearing wire numbers as per approved wiring diagrams. All wires, which, if interfered, may cause tripping, shall be identified with a separate ferrule engraved with a “T”.
6.11 Terminal Blocks
6.11.1 Terminal blocks shall be 600V grade self insulated, box clamp type with marking strips 10 Sq.mm or equal. Terminals for C.T. Secondary leads shall have provision for shorting.
6.11.2 Not more than two wires shall be connected to any terminal. Spare terminals equal in number to 20% active terminals shall be furnished.
6.12 Cable Termination
6.12.1 Switchgear shall be designed for cable entry from the bottom. Sufficient space shall be provided for ease of termination and connection.
6.12.2 All provisions and accessories shall be furnished for termination and connection of cables, including removable gland plates, cables supports, crimping type lugs, brass compression glands with tapered washer (Power cables only) and terminal blocks.
6.12.3 The gland plates shall be minimum 3 mm thick. The gland plate and supporting arrangement for 1/C power cables shall be of non-magnetic material to minimize flow of eddy current.
6.13 Ground Bus
6.13.1 A copper ground bus, rated to carry maximum fault current, shall extend full length of the switchgear.
6.13.2 The ground bus shall be provided with two-bolt drilling with bolts and nuts at each end to receive adequately sized copper flats or copper ground wires.
6.13.3 Each stationary unit shall be connected directly to the ground bus. The frame of each circuit breaker and drawout V.T. unit shall be grounded through heavy multiple contacts at all times except when the primary disconnecting devices are separated by a safe distance.
6.13.4 C.T. and V.T. secondary neutrals shall be earthed through removable links so that earth of one circuit may be removed without disturbing other.
6.13.5 All hinged doors shall be earthed through flexible copper braid. 6.14 Nameplates
6.14.1 Nameplates of approved design shall be furnished at each cubicle and at each instruments & device mounted on or inside the cubicle. Cubicle nameplates shall be provided both at the front and back of the cubicle.
6.14.2 The material shall be lamicoid or approved equal, 3 mm thick with black letter on white background.
6.14.3 The nameplate shall be held by self-tapping screws. Nameplate size shall be minimum 20mm x 75mm for instrument/device and 40mm x 150mm for panels.
6.14.4 Caution notice e.g., “DANGER, HIGH VOLTAGE, DO NOT OPEN WHEN POWER IS ON” on suitable metal plate shall be affixed at the back of each vertical panel
.
6.15 Space Heaters and Plug Sockets
6.15.1 Each cubicle shall be provided with thermostat controlled space heaters and 5A, 3 pin plug socket.
6.15.2 Cubicle heater, Plug/socket circuits shall have individual switch fuse units. 6.15.3 Heater kW rating shall be four (4) times the kW heat load requirement. 6.16 A.C / D.C Power Supply
6.16.1 The following power supplies shall be made available to each switchgear: A.C. supply : 230V, 1-ph, 2-wire Single Feeder.
D.C. supply : 110V DC Double Feeder.
6.16.2 Isolating switch fuse units shall be provided at each switchgear for the incoming supplies, 2-pole, single throw for A.C. and 2- pole, double throw for D.C.
7.0
TESTS
7.1 The switchgear shall be completely assembled, wired, adjusted and tested at the factory as per the relevant IEC standards.
7.2 Routine Test
The tests shall include but not necessarily limited to the following:
a) Operation under simulated service condition to ensure accuracy of wiring, correctness of control scheme & proper functioning of the equipment.
b) All wiring and current carrying part shall be given appropriate High Voltage test. c) Primary current and voltage shall be applied to all instrument transformers.
d) Routine test shall be carried out on all equipment such as circuit breakers, instrument transformers, relays, meters, transducers etc.
7.3 Type Test
The following test shall be performed on a typical section of the bus assembly: a) Impulse Test
b) Temperature rise Test c) Short circuit Test (optional)
The cost of such tests, if any, shall be quoted separately. If test certificates of identical equipment is available, same shall be submitted along with tender. If the same are found acceptable, requirement of Type Tests may be waived.
7.4 Test Witness
The manufacturer shall perform factory tests on equipment in presence of customer’s representative. The manufacturer shall provide all inspection facilities for the said inspection and testing. The inspector shall have the right to reject any portion of the equipment at any time during manufacture if it does not meet the requirements of this specification in all particulars. The manufacturer shall give at least fifteen (15) days advance notice of the date when the tests are to be conducted.
7.5 Test Certificates
7.5.1 Test certificate shall be furnished in required number of copies.
7.5.2 The routine and type test certificates of the switchgears shall be furnished for approval before the dispatch of the equipment from the works.
7.5.3 The routine and type test certificates of miscellaneous components shall also be furnished for approval.
8.0
DRAWINGS, DATA & MANUALS
8.1 To be submitted with the Bida) General arrangement drawing showing constructional features, space required in front for withdrawals, power & control cable entry points etc.
b) Bill of Materials
c) Typical foundation plan
d) Typical breaker control schematic
e) Type test certificates on various components f) Technical leaflets on
i) Circuit breaker
ii) Instrument transformers
iii) Relays, meters, switches, transducers etc. 8.2 To be furnished for Approval and Distribution
a) Outline dimensional drawing of the switchgear showing general arrangement, space requirements & cable entry points.
c) Foundation plan & loading d) Single line diagram e) Control schematics f) Wiring diagrams g) Relay Particulars
8.3 Instruction Manuals for Switchgear and Associated Equipment
The manual shall clearly indicate that the method of installation, check-ups and tests to be carried out before commissioning of the equipment.
8.4 The Bidder may note that the drawings, data and manuals listed herein are minimum requirements only. The Bidder shall ensure that all other necessary write-ups, curves,
calculations and information required to fully describe the equipment are submitted with his bid.
9.0
SPARES
10.0
ANNEXURE-A: RATINGS AND REQUIREMENT
1.0 SWITCHGEAR 33kV 11kV
1.1 General
Type : --- Metal-clad, drawout
---Service : --- Indoor
---Enclosure : --- Refer Clause
6.1.2---1.2 System
Voltage : 33kV±10% 11kV ±10%
Phase : --- 3
---Frequency : --- 50 Hz ± 5%
---System ground : ---Non-effectively
earthed---1.3 Rated Current at site ambient
Bus bar : 1250A 2000A
Circuit breaker : 1250A for I/C 2000A for I/C 1250A for O/G
1.4 Short Circuit Rating
Short time for 3 Secs. : 31.5 KA 31.5 kA
1.5 Insulation level (peak/r.m.s) : 170kVp/70kVrms 75kVp/28kVrms
1.6 AC/DC Power Supply
---Service voltage : --- 230V±10%, 1 Ph, 50 Hz ± 5%
---2.0 CIRCUIT BREAKER
2.1 Duty Cycle : - 0 - 3' - CO - 3' – CO
---11.0
ANNEXURE-B: BILL OF MATERIALS
The minimum requirement of instrument transformers, metering and protections to be provided for different type of feeders are listed below :
1.0 33kV Incoming Feeder
a) 3 - Protection Class (5P20) CTs (1-phase) b) 3 – Metering Class CTs (Cl. 1.0) (1-phase) c) 3 – Differential Class (Class PX) CTs (1-phase) d) 3 – Two winding Potential Transformer (1-phase) e) 1 – Multi-function Meter
f) 1 – Ammeter with selector switch g) 1 – Voltmeter with selector switch
h) Two (2) pole IDMTL O/C relay with Instantaneous element (50/51) for phase fault. i) One (1) no. IDMT O/C relay with Instantaneous element (50N) for earth fault. j) One 3-ph Differential Relay (87)
k) All auxiliary relays, Lockout relay, Transformer auxiliary relays, indicating lamps, etc.
2.0 11kV Incoming feeder (From Transformer)
a) Three (3) no. measuring class current transformers.
b) Three (3) no. protection class current transformers for over current relays.
c) Three (3) no. PX class current transformers for differential protection for 33/11.5kV transformer.
d) Three (3) no. three winding voltage transformer (1-phase), one winding with open delta. e) 1 – Multi-function Meter
f) 1 – Ammeter with selector switch g) 1 – Voltmeter with selector switch
h) Two (2) pole directional o/c relays (67) for phase fault. i) One (1) no. directional o/c relay (67N) for earth fault. j) One 1-ph Restricted E/F Relay (64)
k) Three (3) no. under voltage relays (27) of range 40-80% with timer and auxiliary relay. l) One (1) no. Frequency Relays (81).
m) One (1) no. Voltage relay for ground fault detection.
n) All auxiliary relays, Lockout relay, Transformer auxiliary relays, indicating lamps, etc. 3.0 11kV Bus VT
a) Three (3) no. two winding voltage transformer.
b) Three (3) no. no volt relay (0 – 20%) with timer and auxiliary relay 4.0 11kV Line Feeder
a) Three (3) no. measuring class current transformers.
b) Three (3) no. protection class (class 5P20) current transformers for O/C Protection relays.
c) Two (2) no. inverse time o/c relays (51) for phase fault. d) One (1) no. inverse time o/c relay (51N) for earth fault . e) One no. Multifunction Meter.
f) 1 – Ammeter with selector switch.
g) All auxiliary relays, Lockout relay, Transformer auxiliary relays, indicating lamps, etc. 5.0 LV Transformer Feeder
a) Three (3) no. measuring class current transformers.
b) Three (3) no. protection class (class 5P20) current transformers for O/C Protection relays.
c) Three (3) no. inverse time o/c relays with instantaneous element (50/51) for phase fault. d) One (1) no. inverse time o/c relay with instantaneous element (50N) for earth fault . e) One no. Multifunction Meter.
f) 1 – Ammeter with selector switch.
g) All auxiliary relays, Lockout relay, Transformer auxiliary relays, indicating lamps,etc. 6.0 Capacitor Bank Feeder
c) Two (2) no. inverse time o/c relays with instantaneous element (50/51) for phase fault. d) One (1) no. inverse time o/c relay with instantaneous element (50N) for earth fault . e) One no. Multifunction Meter.
f) 1 – Ammeter with selector switch.
g) One no Current Unbalance Relay for Neutral Displacement.
h) All auxiliary relays, Lockout relay, Transformer auxiliary relays, indicating lamps, etc.
7.0 Apart from protection relays, each breaker shall be provided with antipumping (94), trip annunciation (30), trip supervision (74), lockout (86) and other auxiliary relays. Lockout relay shall be hand reset type.
8.0 All inverse time o/c relays shall be of 3 sec version. All definite time o/c relays shall have adjustable time range to be decided by the Bidder after application check.
9.0 Any other protection/relay not explicitly mentioned but necessary for satisfactory and trouble-free operation of the system are deemed included within the scope of supply.
10.0 Bus Transfer Scheme
a) Facility for running two incoming source of power supply in parallel shall be provided. For this purpose synchro check relay shall be provided. Provision shall be made for operation from both local and remote (SCADA).
a) Automatic change over from one source to the other will be initiated if one of the incomer breaker trips. Bus coupler breaker will close automatically provided selector switch is in Auto position.
c) All manual and automatic transfer schemes shall be contingent on associated protective lockout devices being in reset position and operated through SCADA system.
12.0
ANNEXURE-C: TECHNICAL PARTICULARS
A. SWITCHGEAR ASSEMBLY 1.0 General 1.1 Make : 1.2 Type : 1.3 Reference Standard : 1.4 Voltage (Nom./Max.) KV : 1.5 Phase, Frequency No, Hz : 1.6 Short Circuit Ratinga) Peak withstand Kap : b) Short-time for 3 sec. KA rms : 1.7 Insulation Level
c) Impulse Withstand Kvp : d) 1-min. 50 Hz. Voltage
Withstand KV rms:
1.8 Metal-clad construction ? Yes/No:
1.9 Degree of Protection :
1.10 Minimum thickness of sheet
metal used mm. :
1.11 Switchgear completely assembled, wired and
tested at factory. Yes/No: 2.0 CONSTRUCTION
2.1 Draw-out feature provided for :
a) Circuit breaker with SERVICE, TEST and DISCONNECTED
position Yes/No :
b) Voltage Transformer Yes/No : c) Protective relays Yes/No :
with breaker in TEST position.Yes/No: b) Working zone limits from floor
level mm. :
2.3 All meters, switch & relays flush
mounted type. Yes/No :
2.4 Minimum clear space required at :
a) Front for breaker withdrawal mm :
b) Rear mm :
2.5 Typical vertical section :
a) Overall dimension & weight : mm Kg.
i) Incomer/Tie :
ii) Buscoupler :
iii) Transformer/Motor
feeder :
iv) Outgoing feeder :
3.0 BUS BAR
3.1 Make :
3.2 Material & Grade :
3.3 Reference, Standard :
3.4 Cross sectional Area/Size Sq. mm : 3.5 Continuous Current (at
site condition, 40 Deg. C
ambient and within cubicle) : 3.6 Maximum temperature rise
over 40 Deg. C Deg. C :
3.7 Short-time current for 3 sec. KA rms:
3.8 DC resistance at 85 Deg. C Ohm/m/ph :
3.9 Skin-effect ratio :
3.10 Reactance Ohm/m/ph :
3.11 Losses-middle phase W/m/ph : 3.12 Minimum clearance of bare
a) Phase to phase mm. :
b) Phase to ground mm. :
3.13 Bus bar provided with
a) Insulating sleeve :
b) Phase barriers :
c) Cast resin shrouds for joint
: 3.14 Bus Connections
a) Made with antioxide
grease :
3.15 Bus bar support spacing mm. : 3.16 Bus support insulator
a) Make : b) Type : c) Reference Standard : d) Voltage Class KV : e) Minimum creepage distance mm : f) Cantilever strength Kg/Sq.cm : g) Net weight Kg. :
3.17 Busbar colour coded ? Yes/No: 4.0 CIRCUIT BREAKER 4.1 Make : 4.2 Type : 4.3 Reference standard : 4.4 Rated voltage KV : 4.5 Rated frequency Hz. :
a) Continuous (at 40 Deg.C
ambient & within cubicle). Amp. : b) Short-time current for
3 sec. KA rms. :
4.8 Maximum temperature rise
over 40 Deg. C ambient. Deg.C :
4.9 Rated operating duty :
4.10 Interrupting capacity at rated voltage and operating
duty - symmetrical KA rms:
4.11 Rated making current KA peak : 4.12 Transient Recovery Voltage
a) Rate of rise KV/ms :
b) Peak voltage KV :
4.13 Maximum over voltage factor when switching off
a) Unloaded transformer :
b) Loaded transformer :
c) Unloaded lines :
d) Induction Motor :
4.14 Insulation Level
a) Impulse voltage with-stand with 1.2 x 50
micro sec. wave KV peak :
b) 1-minute 50 Hz. voltage
withstand. KV :
4.15 At 100% interrupting capacity
a) Opening time - Max. ms :
b) Arcing time Max. ms :
c) Total tripping time
(Maximum) ms :
4.16 Total closing time (Max.) ms : 4.17 Number of breaks per pole :
4.18 Total length of breaks per
pole mm :
4.19 Total length of contact
travel mm :
4.20 Rate of contact travel
a) At tripping m/sec :
b) At closing m/sec :
4.21 No. of breaker operations permissible, without requ-iring inspection, replace-ment of contacts and other main parts : a) At 100% rated current : b) At 100% rated inter-rupting current : 4.22 Type of contacts : a) Main : b) Arcing : 4.23 Material of contacts a) Main : b) Arcing : c) Whether contacts silver plated : d) Thickness of silver plating :
4.24 Contact pressure at no load Kg. : 4.25 Minimum clearance in air mm :
a) Between poles :
b) Between live parts
and ground :
a) Type : b) No. of breaker operations
stored :
c) Trip free or fixed trip ? : d) Anti-pumping features
provided ? :
4.28 Spring charging motor
a) Rating KW : b) Voltage (A.C. or D.C.) V : c) Permissible voltage variation % : 4.29 Closing Coil a) Voltage V : b) Permissible voltage variation % : c) Closing current at rated voltage A : 4.30 Tripping Coil a) Voltage V : b) Permissible voltage variation. % :
c) Trip current at rated
voltage A :
4.31 For trip circuit supervision can the tripping coil be connec-ted in series with :
a) Auxiliary `74' as shown
in the drawing :
b) Red lamp when breaker
is closed :
4.32 Breaker/Cubicle Accessories Accessories such as control switch, indication lamps, relays
furnished as specified : Breaker/Breaker Cubicle
Pro-vided with the following a) Mechanical safety
interlock :
b) Automatic safety shutter : c) Emergency manual trip : d) Mechanical ON-OFF indicator :
e) Operation counter :
f) Charge/Discharge indication : g) Cell switch with 3 NO
+ 1 NC contacts for each of Test &
Service positions :
h) Auxiliary Switch with 6 NO + 6 NC contacts mounted on drawout
portion :
i) Spare 6 NO + 6 NC contacts for interlock
provided by :
i) Electrically reset
lockout relay :
ii) Auxiliary Switch mounted on the
stationary part :
j) Manual spring charging
facility ? :
k) Surge protection device ? : 4.33 Cell/Auxiliary Switch
a) Are switch contacts
convertible type ? :
b) Contact rating at : 230V A.C. 110V D.C. I) Rated & Making current :
4.34 Trip circuit supervision relay
furnished for each breaker : 4.35 Net weight of the breaker Kg : 4.36 Impact load for foundation
design (to include dead load plus impact values on opening at
maximum interrupting rating) Kg : 4.37 Overall dimension (LxBxH) mm : 4.38 Type test report on identical
breaker furnished :
5.0 CONTROL & INDICATIONS 5.1 Push Buttons
a) Make :
b) Type & Cat. No. :
c) Contact rating at 110 V D.C. :
I) Make & continuous Amp. : ii) Break (Inductive) Amp. : iii) P. F for D. C. & L/R
for DC break :
5.2 Lamps
a) Make :
b) Type & Cat. No. :
c) Watts/voltage :
d) Series resistance ohm :
e) Lamp & Lens replaceable
from front. :
5.3 Selector Switch
a) Make :
b) Type & Cat. No. :
c) 3-position stay put type ? : d) Contact rating at 110V D.C. :
i) Make & continuous Amps : ii) Break (Inductive) Amps : e) Key interlock furnished ? : 6.0 CURRENT TRANSFORMER
6.1 Make :
6.2 Type :
6.3 Reference standard :
6.4 CT ratios as per drawings ? :
6.5 Rated frequency :
6.6 CT for Differential Protection
a) Class :
b) Secondary resistance at
75 Deg.C :
c) Knee point voltage :
d) Excitation current at Vk/2 :
6.7 C.T. for Metering : VA Burden CLASS/ALF or ISF
a) Incomer/Tie : b) Motor Feeder : c) Transformer Feeder : d) Outgoing Feeder : 6.8 C.T. for Relaying a) Incomer/Tie : b) Transformer Feeder : c) Outgoing Feeder :
6.9 Short Circuit Withstand a) Short-time current
b) Dynamic current KA peak : 6.10 Class of Insulation
6.11 Temperature rise over
40 Deg. C ambient Deg.C :
6.12 Basic Insulation level KV peak : 6.13 CT magnetisation curve furnished : 7.0 VOLTAGE TRANSFORMER 7.1 Make : 7.2 Type : 7.3 Reference standard : 7.4 Voltage ratio : 7.5 Rated frequency : 7.6 Accuracy class : 7.7 VA burden :
7.8 Over voltage factor
a) Continuous :
b) 30 seconds :
7.9 Class of Insulation :
7.10 Temp. rise over 40 Deg.C
ambient Deg.C :
7.11 Basic Impulse level Kvp peak : 7.12 Winding Connection a) Primary : b) Secondary : 7.13 Fuses a) Continuous ratings - H.V/L.V Amps : b) Symmetrical fault rating - HV/LV KA rms : 7.14 Whether separate V. T.
compartments provided Yes/No : 8.0 RELAYS
8.1 Draw-out type with built
in test facilities :
8.2 Type of mounting ? :
8.3 Reference standard :
8.4 All relays furnished as per
the drawings & annexures : 8.5 All relevant relay leaflets
and catalogue furnished ? Yes/No :
8.6 Relay details :
8.6.1 Incomer feeder Make Type Range
a) 2- I.D.M.T O/C relay
for phase fault 51 :
b) Ground fault voltage detection 59 : c) Differential Protection 87 : d) Restricted E/F protection 64 : e) Stand by E/F protection 51 N : f) Under frequency protection 81 : 8.6.2 Transformer feeder
a) 2-IDMT o/c relay with high-set instantaneous
unit 50/51 :
b) 1-Instantaneous o/c relay for
earth fault 50N :
c) Voltage actuated
auxiliary relay 63X :
8.6.3 Capacitor feeder
a) 2-IDMT o/c relay with high-set instantaneous
earth fault 50N :
8.6.4 Changeover
Relays furnished for automatic changeover :
a) : b) : c) : d) : e) : f) : g) : h) : i) : j) :
8.6.5 Miscellaneous relay Make Type Range
a) Antipumping relay 94 :
b) Trip supervision relay 74 : c) Lockout relay 110 V
D.C. hand reset with 86 :
4 pairs of contact :
8 pairs of contact :
d) Time delay relay
Delay on drop out 62 :
Delay on pick up 2 :
e) Frequency
compen-sated u/v relay 27 (40-80%) no volt relay (0-20%)
1-pole : f) Auxiliary relay 110 V
D.C. self reset with x :
4 pair of contact : 8 pair of contact : g) Auxiliary relay 220 V D.C. Electrical reset with : 4 NO + 4 NC contact : 6 NO + 6 NC contact : 9.0 METERS 9.1 Make : 9.2 Type : 9.3 Reference standard : 9.4 Size : 9.5 Scale : 9.6 Accuracy class : 9.7 Meter switch a) Make : b) Type : c) Cat. No. : 10.0 SECONDARY WIRING
10.1 Type and Insulation :
10.2 Voltage grade :
10.3 Conductor material :
10.4 Conductor size(minimum)
a) Potential circuit :
b) Control & current circuit : 10.5 Wires identified at both ends
11.1 Make : 11.2 Type : 11.3 Cat. No. : 11.4 20% spare terminals furnished : 12.0 CABLE TERMINATION
12.1 Cable termination & connection arrangement furnished as
specified :
12.2 Cable termination kit furnished
a) Make :
b) Type :
c) Complete with all
accessories : 12.3 Cable Lugs a) Type : b) Material : 12.4 Cable Gland a) Type : b) Material :
c) With tappered washer :
d) With armour clamp :
12.5 Removable Gland Plate a) Material for multi-core
cable :
b) Material for single-core
cable :
c) Thickness of the plate : 13.0 GROUND BUS
13.2 Material : 13.3 Size : 14.0 NAME PLATE 14.1 Material : 14.2 Thickness : 14.3 Size for a) Panel mm : b) Equipment/devices mm :
15.0 SPACE HEATER/PLUG SOCKET 15.1 Cubicle Heater a) Thermostat controlled ? : b) Wattage : c) Voltage : 15.2 Plug Socket a) Type : b) Rating : 16.0 A.C./D.C. SUPPLY
16.1 Isolating switches fuse unit /MCCB for incoming supply :
a) A.C. - type & rating : b) D.C. - type & rating : 16.2 Isolating switch fuse unit/MCB at
each cubicle :
a) A.C. supply - type & rating : b) D.C. supply - type & rating :
17.0 TROPICAL PROTECTION 17.1 a) Any special treatment
b) Screens are of corrosion resistant materials ? : 18.0 PAINTING 18.1 Finish of switchgear : a) Inside : b) Outside :
19.0 NO. OF ACCESSORIES FURNISHED
a) Earthing equipment :
b) Slow closing device for
maintenance :
c) Test cabinet :
20.0 TESTS
20.1 Routine tests to be performed on switchgear :
a) :
b) :
c) :
d) :
20.2 Type tests quoted :
a) : b) : c) : 21.0 DRAWINGS/DATA 21.1 General Arrangement : 21.2 Foundation Plan :
21.3 Breaker Control Schematic :
SECTION-5
SECTION- 5
XX = 01 for Al Talayee substation; 10 for Al Wardia substation and 12 for Al Karama
substation
1
03-XX-DW-E000-0A-General Site Plan
2
03-XX-DW-E001-0A-Electrical Legend & Symbols
303-XX-DW-E002-0A-Electrical Legend & Symbols
403-XX-DW-E003-0A-Electrical Legend & Symbols
5
03-XX-DW-E011-0A-Single Line Diagram - 33/11kV System
603-XX-DW-E012-0C-Three Line Diagram - 33/11 kV System and/or to be obtained from
vendor
7
03-XX-DW-E021-0A-Single Line Diagram - 400V System
803-XX-DW-E022-0A-Single Line Diagram - 400V System
903-XX-DW-E023-0C-Single Line Diagram -400 V System: and/or to be obtained from
vendor
10
03-XX-DW-E041-0A-Single Line Diagram - 110V DC System
1103-XX-DW-E042-0C-Battery & Charger Sizing
12
03-XX-DW-E043-0C-Single Line Diagram -110V DC System: and/or to be obtained from
vendor
13
03-XX-SN-E001-0A-Supply, Erection, Testing & Commissioning of 33/11kV Substation
Equipment & Materials
14
03-XX-SN-E002-0C-Report on transformer loss evaluation
15To be obtained from vendor
16
03-XX-DW-C002-0A-Design Calculation for Septic Tank - Civil
1703-XX-DW-S006-0A-Substation Yard Roads & Drainage
18
03-XX-DW-C001-0C-Design Calculation for Substation Building - Civil
1903-XX-DW-C004-0C-Design Calculation for Aux. Transformer, Capacitor Bank
Foundation, Oil Retention Pit, etc.
20
03-XX-DW-C003-0A-Design Calculation for Transformer Yard, Fire Wall - Civil
21
03-XX-DW-S004-0A-31.5 MVA Transformer Foundation & Fire Wall - GA & RC Details
2203-XX-DW-S001-0A-General Notes and Standard Details of Civil & Structural Works
2303-XX-DW-S002-0C-Substation Building - GA & Details of Floors
24
03-XX-DW-S003-0A-Substation Building - GA & Details of Foundation
2503-XX-DW-S005-0C-Auxiliary Transformer Foundation, NGR & Capacitor Bank - GA &
RC Details
26
03-XX-DW-S007-0C-Substation Yard Boundary Wall - GA &RC Details
2703-XX-DW-S008-0C-Guard House - GA & RC Details
28
03-XX-DW-A001-0A-Substation Building - Plan
2903-XX-DW-A002-0A-Substation Building - Elevations
30
03-XX-DW-A003-0C-Substation Building - Sections & Details
31
03-XX-DW-A004-0C-Guard House - Plan, Elevations &Sections & Details
3203-XX-DW-A005-0C-Substation Building &Guard House - Door, Window, Plumbing &
Finish Schedule
33
03-XX-DW-A006-0C-Septic Tank - Details
34
03-XX-DW-A007-0C-Boundary Wall & Gate - Details
3503-XX-DW-A008-0C-Misc. Details
36
03-XX-DW-E050-0A-Equipment Layout - Switchgear Floor Plan & Sections
3703-XX-DW-E051-0A-Equipment Layout - Transformer, Capacitor & NGR Area Plan &
Sections: K3964-DWG-E-023
38
03-XX-DW-E060-0C-Grounding System - Notes & Details
39
03-XX-DW-E061-0C-Grounding Layout - Switchgear & Transformer Area
4003-XX-DW-E063-0C-Grounding
41
03-XX-DW-E070-0C-Cabling System - Notes & Details
42
03-XX-DW-E071-0C-Cable Routing Plan & Section - Switchgear Room
43
03-XX-DW-E072-0C-Cable Routing Plan & Section - Transformer, Capacitor & NGR Area
4403-XX-DW-E073-0A-Power Cable Schedule
45
03-XX-DW-E074-0C-Control Cable Schedule & Interconnection Chart
4603-XX-DW-E075-0C-Power Cable Sizing
47
03-XX-DW-E090-0C-Lighting & Power Outlet - Notes & Details
48
03-XX-DW-E091-0C-Lighting & Power Outlet Layout - Switchgear Building
4903-XX-DW-E092-0C-Lighting & Power Outlet Layout - Outdoor Area
50
03-XX-DW-E093-0C-Lighting - Indoor & Outdoor Calculation
5103-XX-DW-E094-0C-Telephone System Layout
52
03-XX-DW-M001-0C-THVAC Equipment Sizing Calculation
5303-XX-DW-E080-0C-I/O Signal List: K3964-DWG-E-080
5403-XX-DW-E081-0C-Relay Coordination
55
03-XX-DW-E082-0C-Short Circuit
56To be obtained from vendors
CIVIL, STRUCTURAL & ARCHITECTUAL WORKS
DESCRIPTION DWG #
1 Drawing - Civil & Structural
1.1 General Notes and Standard Details of Civil & Structural Works
K3964-DWG-S-001 1.2 Substation Building - GA & Details of Floors K3964-DWG-S-002 1.3 Substation Building - GA & Details of Foundation K3964-DWG-S-003 1.4 31.5 MVA Transformer Foundation & Fire Wall - GA &
RC Details
K3964-DWG-S-004 1.5 Auxiliary Transformer Foundation, NGR & Capacitor
bank - GA & RC Details
K3964-DWG-S-005 1.6 Substation Yard Roads & Drainage K3964-DWG-S-006 1.7 Substation Yard Boundary Wall - GA & RC Details K3964-DWG-S-007 1.8 Guard house - GA & RC Details K3964-DWG-S-008 2 Drawings - Architectural
2.1 Substation Building - Plan K3964-DWG-A-001 2.2 Substation Building - Elevations K3964-DWG-A-002 2.3 Substation Building - Sections & Details K3964-DWG-A-003 2.4 Guard House - Plan, Elevations & Sections & Details K3964-DWG-A-004 2.5 Substation Building & Guard House - Door, Window,
Plumbing & Finish Schedule
K3964-DWG-A-005
2.6 Septic Tank - Details K3964-DWG-A-006
2.7 Boundary Wall & Gate - Details K3964-DWG-A-007
