Introduction:
Bushings
are insulated devices that allow an electrical conductor to pass safely through
a grounded conducting barrier such as the case of a transformer, circuit
breaker or a switchgear. Our company offers different types of electric
bushings for indoor or out door uses.
Product
dimensional drawings:
Main
technical parameters of the product
|
Rated voltage
|
12kV
|
|
Rated current
|
630A/1250A
|
|
Rated frequency
|
50Hz
|
|
Rated short-circuit breaking current
|
20kA/25kA
|
|
Rated short-circuit breaking current (breaking times)
|
30Times
|
|
Rated Short Circuit Making Capacity
|
50kA/63kA
|
|
Rated peak withstand current
|
50kA/63kA
|
|
Rated short-time withstand current (4S)
|
20kA/25kA
|
|
Dry power frequency, routine test 1 min
|
42kV/48kV（interface）
|
|
Wet power frequency, routine test 1 min
|
34kV
|
|
Lightning impulse withstand voltage (peak)
|
75kV/85kV（interface）
|
|
Rated short circuit duration
|
4S
|
|
Mechanical life
|
10000 times
|
|
Dynamic and static contacts allow wear cumulative
thickness
|
3mm
|
|
Contact opening distance
|
9±1mm
|
|
Contact overtravel
|
2±0.5mm
|