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.
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- 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
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| Type |
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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
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| h1 |
mm |
3927
|
5292
|
| h3 |
mm |
2120
|
1818
|
| b1 |
mm |
3840
|
4450
|
| b8 |
mm |
900
|
900
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Standard values in accordance with IEC; further data by request
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