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Specifications

Electrical ratings

  15 kV 25 kV 35 kV
Maximum design voltage, kV 95 125 38
BIL, kV 95 125 150
1-minute withstand voltage (60 Hz) interrupter and terminators, kV 
35 40 50
Continuous current (max), A 
600 600 600
Interrupting current (sym./asym.), kA 
12/20 
12/20 
12/20 
Momentary current 10 cycles (asym.), kA 
20 20 25
1-second withstand current (sym.), kA 
12 12 12
Making current (sym.), kA 
12 12 12
Transformer magnetizing interrupting current, A 
21 21 21
Cable charging interrupting current, A 
15 15 20
Capacitive, A 
10 25 40

Switching and transfer times

Direction of transfer transition Type of return (cycles) First interrupter reaction time* (cycles) Transition time* (cycles)
Preferred to alternate Non-parallel 2.0 to 3.0 5.0 to 6.0
Alternate to preferred Non-parallel
2.0 to 3.0 5.0 to 6.0
Alternate to preferred Parallel** 5.0 to 6.0 2.0 to 3.0
* Time from expiration of time delay to first opening (or closing) of high-voltage interrupter. Add about 1 cycle to values shown to allow for iST control contact time. 
** Parallel return time does not include sync check time.

Standard features

  • Hinged cover and doors to provide easy access to connections and controls
  • Push-pull handles for manual charging of the stored energy switch operators
  • Contact position indicator
  • Operation counter, one for each switch
  • Manual trip/close levers lockable in the open position
  • Disconnect switches for internal sensing PTs
  • Spring charged status indicators
  • Liquid sight gauge provides visual indication of liquid level within tank
  • Mineral oil fluid dielectric medium

Optional features

  • Mild or stainless steel construction
  • Motor operation
  • Additional two-stage auxiliary switches
  • Operation counters on tap ways (model 9 only)
  • Semaphores on tap ways (model 9 only)
  • Visible break on tap ways (model 9 only)
  • Fault indicator provisions
  • Drain valve w/sampler
  • E200 or Envirotemp FR3 fluid dielectric medium