CONTROL & RELAY PANEL - West Bengal State …

1 WBSETCL / TECH SPEC / Page 1 of 104 CONTROL & RELAY PANEL CONTROL & RELAY PANEL March 2015 Engineering Department west Bengal State ELECTRICITY TRANSMISSION COMPANY LIMITED Regd. Office: VidyutBhawan, Block DJ, Sector-II, Bidhannagar, Kolkata 700091. CIN: U40101WB2007 SGC113474; Website: WBSETCL / TECH SPEC / Page 2 of 104 CONTROL & RELAY PANEL TECHNICAL SPECIFICATION FOR CONTROL & RELAY PANEL SCOPE: The specification covers design, engineering, manufacture, testing & supply delivery at site of CONTROL and RELAY Board and protection RELAY panels inclusive of internal wiring and with arrangement for external connection to various Switchyard equipments and CONTROL room building equipments as necessary. The Contractor has to design the Schematics for protection and CONTROL of all equipments including monitoring indications, visual and audible alarm, interlocking schemes between different equipment.

2 Any other requirement which are not specifically covered here but which are necessary for successful commissioning of the Sub-station are also within the scope of the Contract. The same shall be indicated by the bidder with their price for WBSETCL's consideration. The equipment manufactured should conform to the relevant standards and of highest quality of engineering design and workmanship. The equipment manufactured shall ensure satisfactory and reliable performance throughout the service life. STANDARDS: Unless otherwise specified all equipment and material shall conform to the latest IS applicable standards. Equipment complying with other internationally recognised standards will also be considered if it ensures performance equivalent or superior to Indian standards. In the event of supply of equipment conforming to any international\ internationally recognised standards other than the standard listed below, the salient features of comparison shall be brought out and furnished along with the bid.

3 One copy of such standard specification in English language shall be enclosed with the tender. The equipment provided shall also comply with the latest revisions of Indian Electricity act and Indian Electricity rules and any other applicable Statutory provisions, rules and regulations. All equipment provided under the specification shall generally conform to the latest issue of the following: IEC/Indian Standard No. Title IS 3231 & IEC-255 Electrical relays for power system protection IS 1248 & IS 2419 Indicating Instrument WBSETCL / TECH SPEC / Page 3 of 104 CONTROL & RELAY PANEL IS 6236 Recorders IS 722 Static Energy meters IEC 679 Static TVM IEC 337 &337-1 CONTROL Switches (LV Switching devices for CONTROL and auxiliary circuit) IS 2705 Current Transformers IS 3156 Voltage Transformer IS 4237 General requirement for Switch gear and CONTROL gear for voltage not exceeding 1 KV.

4 IS 375 Marking and arrangement for Switchgear Bus bars, main connection and auxiliary wiring. IS 8686 Specification for static protective relays REQUIRED QUANTITIES: Quantity of C & R panels are to be assessed by the bidders from the Schedule enclosed with this specification. However, if any corridor in the switchyard layout is left for future use in between two proposed bays included in the project, blank panels without any equipment, relays etc but only with matching mimic are to be supplied. Technical particulars to be considered for Design of CONTROL and RELAY board, and protection panels : SYSTEM DETAILS : 400KV 220KV 132KV 33KV ------- ----- ----- ----- a) Nominal System 400KV 220KV 132KV 33KV Voltage b) Highest System 420KV 245KV 145KV 36KV Voltage c) Number of Phases <-------------------------- Three -------------------------> d) Frequency <-----------------------50 Hz +/- 3% -------------------> e) Grounding < -------- Effectively Earthed-------------> through f) Maxm.

5 Fault 50KA 40KA - Current (rms) (rms) (rms) WBSETCL / TECH SPEC / Page 4 of 104 CONTROL & RELAY PANEL AUXILIARY SUPPLY : voltage shall be normally fed from Battery charger and battery connected in parallel which is 220V +/- 10%. In case of failure of the AC supply to battery charger, DC Supply voltage will be available automatically from lead acid Battery. The Supply voltage may vary from -10% to + 10%. The system shall be 2 wire with necessary positive earth fault and negative earth fault annunciation scheme. The ripple content in the supply from charger will be less than 2%. AC Auxiliary supply voltage for the C&R PANEL shall be 230V, 1-phase, 50Hz grounded with +/- 10% voltage variation. WBSETCL / TECH SPEC / Page 5 of 104 CONTROL & RELAY PANEL CT & PT RATIO AND INDICATING INSTRUMENT RANGE: CORE DETAILS OF CURRENT TRANSFORMER Sl.

6 No. Description No of Core Core No. Application Current Ratio Output Burden (VA) at Lower Ratio ISF (Max) Accuracy class as per IS 2705 Min Knee point Voltage (V) Max CT Secy Winding Resistance (W) Max excitation current (mA) at Knee point Voltage 1. a) 400 KV CT (Bay Two main one Transfer Scheme) i Feeder, Transformer, Bus Reactor, Bus Coupler & Bus Transfer Bay 5 1 Protection 2000-1000/1A PS Class 2000/1000 10/5 30/60 2 Protection 2000-1000/1A PS Class 2000/1000 10/5 30/60 3 Metering 2000-1000/1A 20 5 4 Protection 2000-1000/1A PS Class 2000/1000 10/5 30/60 5 Protection 2000-1000/1A PS Class 2000/1000 10/5 30/60 b) 400kV CT (One & a Half Breaker Scheme) i Line side CT 6 4 cores Protection 3000-2000/1A PS Class 3000/2000 15/10 30/45 2 cores Metering 3000-2000-1000/1A 20 5 ii Tie & Bus side CT 4 4 cores Protection 3000-2000/1A PS Class 3000/2000 15/10 30/45 c) Bushing CT (Transformer) i 400KV side, 220kV side & Neutral of 315 MVA, 400/220/33KV Transformer 1 1 Protection 1000/1A PS Class 1000V 30 at Vk/2 WBSETCL / TECH SPEC / Page 6 of 104 CONTROL & RELAY PANEL Sl.

7 No. Description No of Core Core No. Application Current Ratio Output Burden (VA) at Lower Ratio ISF (Max) Accuracy class as per IS 2705 Min Knee point Voltage (V) Max CT Secy Winding Resistance (W) Max excitation current (mA) at Knee point Voltage d) Bushing CT (Bus Reactor) i 400KV line side of 80 MVAR Bus Reactor 4 1 Protection 200/1A PS Class 200V 1 40 at Vk/4 2 Protection 200/1A PS Class 200V 1 40 at Vk/4 3 Protection 200/1A PS Class 200V 1 40 at Vk/4 4 Metering 200/1A 10 5 1 ii Neutral side of 80 MVAR Bus Reactor 4 1 Protection 2000-1000/1A PS Class 2000/1000V 10/5 30/60 2 Protection 2000-1000/1A PS Class 2000/1000V 10/5 30/60 3 Protection 200/1A PS Class 200V 1 40 at Vk/4 4 WTI 10 2. a) 220 KV CT (Bay) i Feeder, Transformer & Bus Transfer Bay 5 1 Metering 1000-800-400/1A 20 5 2 Protection 1000-800-400/1A PS Class 1500/1200/ 600V 5/4/2 30 3 Protection 1000-800-400/1A PS Class 1500/1200/ 600V 5/4/2 30 4 Protection 1000-800-400/1A PS Class 1500/1200/ 600V 5/4/2 30 5 Protection 1000-800-400/1A PS Class 1500/1200/ 600V 5/4/2 30 ii Bus Coupler 3 1 Metering 2000-1600/1A 20 5 2 Protection 2000-1600/1A PS Class 2000/1600V 10/8 30 3 Protection 2000-1600/1A PS Class 2000/1600V 10/8 30 WBSETCL / TECH SPEC / Page 7 of 104 CONTROL & RELAY PANEL Sl.

8 No. Description No of Core Core No. Application Current Ratio Output Burden (VA) at Lower Ratio ISF (Max) Accuracy class as per IS 2705 Min Knee point Voltage (V) Max CT Secy Winding Resistance (W) Max excitation current (mA) at Knee point Voltage b) Bushing CT (Transformer) i 220KV side, 132KV side & Neutral of 160 MVA Transformer 1 1 Protection 800/1A PS Class 1000V 30 at Vk/2 ii 220KV side & Neutral of 50 MVA Transformer 1 1 Protection 400/1A PS Class 800V 30 at Vk/2 c) 33 KV CT for Tertiary Loading i 220/132/33 KV Transformer Bay 3 1 Metering 200-100/1A 20 5 2 Protection 200-100/1A PS Class 1200/600V 4/2 30 3 Protection 200-100/1A PS Class 1200/600V 4/2 30 3. a) 132KV CT (Bay) i Feeder, Transformer & Bus Transfer Bay 5 1 Metering 1000-800-400/1A 20 5 2 Protection 1000-800-400/1A PS Class 1500/1200/ 600V 5/4/2 30 3 Protection 1000-800-400/1A PS Class 1500/1200/ 600V 5/4/2 30 4 Protection 1000-800-400/1A PS Class 1500/1200/ 600V 5/4/2 30 5 Protection 1000-800-400/1A PS Class 1500/1200/ 600V 5/4/2 30 WBSETCL / TECH SPEC / Page 8 of 104 CONTROL & RELAY PANEL Sl.

9 No. Description No of Core Core No. Application Current Ratio Output Burden (VA) at Lower Ratio ISF (Max) Accuracy class as per IS 2705 Min Knee point Voltage (V) Max CT Secy Winding Resistance (W) Max excitation current (mA) at Knee point Voltage ii Bus Coupler Bay 3 1 Metering 2000-1600/1A 20 5 2 Protection 2000-1600/1A PS Class 2000/1600V 8 30 3 Protection 2000-1600/1A PS Class 2000/1600V 8 30 b) Bushing CT (Transformer) i 132KV side & Neutral of 50 MVA Transformer 1 1 Protection 400-300/1A PS Class 800-600V 30 at Vk/2 ii 33KV side of 50 MVA Transformer 1 1 Protection 1000/1A PS Class 500 30 at Vk/2 iii 132KV side & Neutral of Transformer 1 1 Protection 150/1A PS Class 600 30 at Vk/2 iv 33KV side of Transformer 1 1 Protection 800/1A PS Class 400 30 at Vk/2 4. a) 33KV CT (Bay) i Feeder, Transformer, Capacitor Bank & Bus Transfer Bay 3 1 Metering 1000-800-400/1A 20 5 2 Protection 1000-800-400/1A PS Class 1000/800/400 4 30 3 Protection 1000-800-400/1A PS Class 1000/800/400 4 30 WBSETCL / TECH SPEC / Page 9 of 104 CONTROL & RELAY PANEL Sl.

10 No. Description No of Core Core No. Application Current Ratio Output Burden (VA) at Lower Ratio ISF (Max) Accuracy class as per IS 2705 Min Knee point Voltage (V) Max CT Secy Winding Resistance (W) Max excitation current (mA) at Knee point Voltage b) 33KV CT (Indoor Switchgear) i Feeder, Transformer, Capacitor Bank & Bus Transfer Bay 3 1 Metering 1000-800-400/1A 20 5 2 Protection 1000-800-400/1A PS Class 250/200/100 4 30 3 Protection 1000-800-400/1A PS Class 1000/800/400 4 30 ii Bus Coupler Bay 2 1 Metering 1000-800/1A 30 5 2 Protection (O/C & E/F) 1000-800/1A PS 250/200 4 30 at Vk CORE DETAILS OF VT Sl. No. Description of Core Number of Core Core Details of Core I CVT/PT Core Details of Core II & III CVT/PT 1 400000/ 3 : 110 / 3, 110/ 3, 110/ 3 3 100 VA, 100 VA , 3P 2 a) AIS:- 220000/ 3 : 110 / 3, 110/ 3, 110/ 3 3 50/200 VA, 50/200 VA , 3P b) GIS:- 220000/ 3 : 110 / 3, 110/ 3, 110/ 3 3 50/100 VA, 50/100 VA, 3P 3 a) AIS:- 132000/ 3 : 110 / 3, 110/ 3, 110/ 3 3 50/200 VA, 50/200 VA , 3P b) GIS:- 132000/ 3 : 110 / 3, 110/ 3 2 50/100 VA, 50/100 VA, 3P 4 a) AIS:- 33000/ 3 : 110 / 3, 110/ 3 2 100 VA, 100 VA, 3P b) Indoor Switchgear: 33000/ 3 : 110 / 3, 110/ 3 2 50 VA, 50 VA, 3P WBSETCL / TECH SPEC / Page 10 of 104 CONTROL & RELAY PANEL INDICATING INSTRUMENT RANGE Indicating instruments (Ammeter, Voltmeter, MW meter, MVAR meter) shall be set as per the CT ratio mentioned in the following table: Ammeter Range.