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Ring Main Unit



GR1

GR1-VI

RING MAIN UNIT – TYPE GR1
  • Rated service voltage: 12kV
  • Rated frequency: 50/60 Hz
  • Rated power frequency withstand voltage: 38kV
  • Rated impulse withstand voltage: 95kVp
  • Ring switch current rating: 630A
  • Rotating arc circuit breaker rating: 630A
  • Busbar rating: 630A
  • Short time withstand current: up to 20kA 3 seconds
  • Internal arc fault withstand: up to 20kA 1 second
  • Full fault rated earthing switch
Construction:
  • Outdoor installation
  • Totally sealed metal enclosed switchgear
  • Extensible type available
  • Tee-off circuit breaker with integral protection system
  • Motorised mechanism available
  • Integral cable test facility for ring switch (optional for tee-off circuit breaker)
  • Protection relay and metering application option
  • Flexible configurations – built up from basic building blocks consisting of ring switches and circuit breakers.
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Ring Main Unit
MV Motor Controlgear (VCU)
Low Voltage Switchboard & Motor Control Centre (LVMCC)
Busduct
Neutral Earthing Resistor (NER)
Container Substation
TransportableMVSubstation