230KV SWITCH YARD CHECK LIST

A. CIVIL

1. Grouting for all tower foundations is completed

2. Grouting for all equipment foundations is completed

3. All cable trenches are cleaned properly & covered with pre cast slabs

4. All cable trench junctions are closed

5. All earth pits are constructed and plastering is done

6. Total Switch yard area is back filled and compacted

7. Final back filling levels are noted

8. 40mm metal is spreaded with a thickness of 40mm

9. All fencing poles are fixed properly and painted

10. Fencing mesh is laid properly

11. Metering fencing is completed with gates and locks

B. ELECTRICAL

1. All towers structure foundations bolts are fixed as per drg.

2. All towers structure foundation bolts are tightened properly

3. All towers structures are erected as per drg.(Angles, Bolts, Washers, Spring washers & nuts)

4. All equipment structure foundation bolts are fixed as per drg.

5. All equipment structure foundation bolts are tightened properly

6. All equipment structures are erected as per drg.(Angles, Bolts, Washers, Spring washers & nuts)

7. All equipments are erected

8. All equipments are named properly with standard painting

9. Earth mat is laid for total Switch yard

10. All cable trays support structures are treated with one coat of anti corrosive paint and 2 coats

of enamel paint

11. Earth mat is laid 2000mm away from fencing

12. All towers are connected to earth mat by 75x12mm GI flat at 2 nearest locations

13. All towers spikes are connected to earth pits by shield wire

14. All equipment structures are connected to earth mat by 65X10mm GI flat at 2 locations

15. All earthing joints are tightened propely

16. All earthing joints are treated with anti corrosive paint

17. All isolator mechanism boxes and earth switches are provided by separate auxiliary earth mat

18. All equipments are connected to earth mat by 65X10mm at 2 locations

19. All equipment junction boxes, mechanism boxes, etc.. are connected to earth mat by 50X6mm

GI flat at 2 locations

20. All cable trays are connected to earth mat by 50X6mm GI flat all along the run

21. Earth flat along the cable trays are treated with anti corrosive paint

22. All earth pits are excavated at a depth of 3mts

23. All earth pits are located by GI/CI pipes

24. Earth pits are filled with alternative layers of salt & charcoal for treated earth pits

25. Transformer body is connected to nearest earth pits

26. Transformer HV neutral is connected earth pit by 75X12mm Cu. flat

27. Earth mat is connected to nearest earth pits

28. Earth pit joints are tightened properly

29. All Cable are laid properly and dressed properly

30. All cables, cable glands are connected to earth flat by Cu. leads

31. Earth pit resistances are measured and noted

32. Individual earth pit resistance should be up to 1 Ohm(If the value is out of limit add the water

and measure once again)

33. Combined earth pit resistance should not be more than 0.5 Ohm

34. All earth pits are covered with CI cover

35. Individual earth pit resistances are noted by paint on respective earth pit with serial no.

36. All power, control and relay panels are erected and earthed properly (CP, RP, ACDB, 220DCDB,

48V DCDB, SCADA, PLCC etc...)

37. Cable schedule is available

38. Cable tagging is completed

39. All testing activities are completed for all equipments

40. All testing readings/reports are noted/collected

41. Whether Switch yard is ready for taking Start Up Power