Give switchyard specification.

Give switchyard specification. 
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1 Answer

Answer :

1. Type : Out door.

2. Scheme : Double main bus bar with bypass switching scheme is provided.

This allows maintenance of one bus or one CB without interruption.

3. Normal voltage : 220 kV.

4. Rated voltage : 245 kV (400 kV)

5. Impulse voltage : 1050 kV (peak)

6. One-minute level : 460 kV (rms.)

7. Dynamic current capacity: 102 kA (peak) and 40 kA for one sec.

8. Rated current capacity : 2000 A for main and 1600 A for feeder bus.

9. Clearances : Phase to earth – 2100 mm.

 Phase to phase – 2100 mm.

 Phase to ground – 5500 mm.

 Sectional clearance – 4300 mm.

 Creepage clearance – (Total) 5600 mm.

– (Protected) 2800 mm.

10. Maximum temperature rise above ambient - 45°C.

11. CB – SF6

12. Isolator – motor operated rotating type.

13. Number of bays – 16 Nos. 
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