Model
No.: JTD 12 kv 1250A 20KA vacuum interrupter for Solid
embedded poles
Main
technical parameters
|
Items
|
Value
|
Rated voltage
|
12kV
|
Rated current
|
1250A
|
Rated frequency
|
50Hz
|
Rated power frequency withstand voltage (1 min)
|
42kV
|
Rated lightning impulse withstand voltage
|
75kV
|
Rated short circuit breaking current
|
20KA
|
Rated short circuit making current(peak value)
|
50KA
|
Breaking operations under rated short circuit breaking current
|
30 times
|
Rated short time withstand current
|
20kA
|
Rated withstand current(peak value)
|
50kA
|
Rated duration of short circuit
|
4s
|
Mechanical life
|
20000 times
|
Closing force due to bellows and atmosphere
|
70±40N
|
Force required to hold contacts opening at full stroke
|
120±50N
|
Circuit resistance at lowest rated contacts force
|
≤35μΩ
|
Storage life
|
20 years
|
Limiting abrasion of contacts
|
3mm
|
Weight of moveable parts
|
≤0.7kg
|
|
|
Mechanical requiements
of vacuum circuit breaker
|
Items
|
Value
|
Clearance between opening contacts
|
7±1mm
|
Average opening speed
|
1.0±0.25 m/s
|
Average closing speed
|
0.65±0.15 m/s
|
Rated contacts pressure
|
1600±100N
|
Contacts bouncing duration at closing operation
|
≤2ms
|
Contacts re-bouncing clearance at opening operation
|
≤2mm
|
Synchronism of three phases
|
≤1ms
|
|
|