The document provides an erection sequence for a 400kV GIS substation. It outlines the step-by-step process for assembling and installing the various components of the substation, including unpacking GIS carts, aligning circuit breakers, erecting current transformers and disconnectors, assembling walkway platforms, installing internal and main buses, erecting bus ducts and supports, testing and filling circuit breakers with SF6 gas, installing gas insulated buses, erecting bushing, line traps, and testing equipment. The sequence shows the substation being fully assembled and tested over numerous steps.

1. 400kV GIS SUBSTATION
ERECTION SEQUENCE
Presented By
Anbarasu B
Project Engineer
400kV GIS Substation

2. Mobilization of GIS cart Unpacking of GIS cart

5. CB ready for placing at the
position
Alignment of CB with 0mm
error

7. Final alignment of CB

8. Current transformer under testing

9. CT placed on temporary
support
Disconnecting ready erect
over CT

10. Lifting of DS and CT after
couplingReplacing of gasket

11. CT and DS erected on CB After completion of all CT
& DS

12. Walkway platform shifted
inside the GIS
Platform during assembling
at ground floor

13. Platform erection over CB
After completion of walkway
platform

14. Diagonal bus placed on temporary support

15. AFTER COMPLETION OF DIAGONAL
BUS

16. Internal bus placed over DS
for compensation unit
After erection of
compensation unit

17. Main Bus support erection Main bus enclosure internal
inspection

18. ERECTION OF MAIN BUS ENCLOSURE

20. Full body cover for internal
inspection
Connecting of internal
conductor parts

21. Erection of Branch bus DS
with branch bus
Erection of branch DS with
branch VT

22. Main bus VT and Fast earth
switch erection with main bus
After completion main bus
VT and FES

23. Circuit breaker inter inspection and absorbent replacement

24. Replacement of absorbent
Connection of DS & ES
operating inter link rod

25. Vacuuming of
gas chamber
CB and all SF6 gas filling

26. Erection GIB support Lifting of GIB after inter inspection
and fixing of conductor

27. Erection of Gas insulated bus and its supports

29. Erection of SF6 toAir bushing

31. Erection of LA Erection of CVT and Line trap

32. High voltage testing kit erection

33. SF6 Gas Leakage test Damaged branch bus enclosure
under leak test after repairing

34. Suspension string lifting for erection

35. Assembling of tension string LIFTING OF TENSION STRING
INSULATOR AND
CONDUCTOR

36. After completion of lifting of
insulator string and its hardware
After completion of
conductor stringing

37. Erection of 220V and 48V battery bank

38. Power and control cable laying

40. Cable termination

41. CABLE TRAY ERECTION AND
FABRICATION

42. Panel base frame fabrication and erection