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Dead Tank –SF6 Circuit Breakers

The Type DT circuit breakers uses the most advanced breaking technology in relation to hydraulic or spring mechanism. Large number of similar circuit breakers are in operation all over the world despite different climatic zones. Ductile properties of housing, support and insulators guarantee extremely high resistance against earthquakes.

  • Hydraulic/Spring mechanism
  • IEC and ANSI standards
  • Single pole design
  • Current transformers on both sides
  • SF6 overpressure relief device on each pole
  • Composite bushings available
  • Housing and support made of ductile steel or  stainless steel
  • Extremely secure seismic construction with  composite  bushings
  • Easy erection and commissioning
  • SF6 density monitor
  • Essentially maintenance free
  • Factory tested transport unit

 

Type
DT 123/145 kV
DT 245/300 kV
Rated voltage kV
123/145
245/300
Rated frequency Hz
50 or 60
Rated light impulse
withstand voltage (1.2/50 µs)
kV
550/650
1050/1050
Rated power frequency
withstand voltage (1 min)
kV
230/275
460/435
Rated nominal current A
1250...3150
1250...3150
Rated breaking current kA
40
40
Rated peak withstand current kA
100
100
Rated duty cycle
O - 0.3 s - CO - 3 min - CO or CO - 15 s -CO
h1 mm
3927
5292
h3 mm
2120
1818
b1 mm
3840
4450
b8 mm
900
900
Standard values in accordance with IEC;  further data by request