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System voltage
kV
Ur
245 kV
LIWV
1050 kVp
PFWV
460 kV
Ir
3150 A
Isc
50 kA · 1 s
Break
60 ms

Module 1 · Switching & protection

Operate a 220 kV GIS line bay, switch by switch

Click any device on the single-line diagram, or use the control panel. Interlocks refuse unsafe operations exactly as a bay controller would, current flows only when the path is closed, and the protection test trips the breaker for a real fault sequence.

SLD · 220 kV GIS · Line bay E-05

Single-line diagram of GIS line bay E-05 Double busbar with bus coupler. Bus-1 and Bus-2 disconnectors 89A and 89B, maintenance earth switch ES1, circuit breaker 52, earth switch ES2, current transformer, line disconnector 89L, fast-acting earth switch FES, voltage transformer, SF6-to-air bushing, surge arrester and the outgoing line. BUS-1 221.3 kV BUS-2 220.9 kV Fed from ICTs & other bays 52-BC 89A 89B ES1 52 ES2 89L FES CT 593 A 21 · 87 · 79 trip VT 220.7 kV TO LINE · 220 kV 220.0 MW

Swipe the diagram sideways for the whole bay

  • Closed
  • Open
  • Energised
  • Dead
  • Earthed
  • Power flow

Sequence of events

  1. BAYLine bay E-05 in service on Bus-1, bus coupler closed.
  2. GASAll eight gas compartments at rated density.
The interlocking rules this bay enforces
  • Disconnectors never make or break load. 89A, 89B and 89L move only with 52 open. The one exception is an on-load bus transfer: with 52-BC closed and the other bus disconnector already closed, the buses are paralleled and the disconnector only commutes current.
  • No disconnector closes onto an earth. ES1 and ES2 must be open before 89A, 89B or 89L closes; FES must also be open for 89L.
  • Maintenance earth switches need the breaker isolated. ES1 and ES2 close only when 89A, 89B and 89L are all open.
  • The fast-acting earth switch needs a dead line. FES closes only with 89L open and no voltage on the line VT. It is rated to make full short-circuit current and to discharge trapped charge and induced current on a long line.
  • The breaker needs its gas and a healthy scheme. 52 closes only with ES1 and ES2 open, the 86 lockout reset and SF6 density above the lockout set-point.
  • The bus coupler holds while buses are paralleled through a bay. 52-BC cannot open while 89A and 89B are both closed, or a disconnector would be left to interrupt the bus transfer current.