12kv Sealed Structured High Voltage AC Indoor Vacuum Circuit Breaker
12kv Sealed Structured High Voltage AC Indoor Vacuum Circuit Beaker
NINGBO TIANAN (GROUP) CO., LTD.
General
VT19-12 indoor HV vacuum circuit breaker is used in three-phase AC electric system of 50HZ,12kV. It is used as control and protection department in the mining company ,power factory and substation. Because of its special advantages, it is also suitable for the site which frequently operation under rated current or multiple breaking short-circuit current.
The circuit breaker is identified by some national standards and international relative standards, such as GB1984,GB/T11022,DL/T403 and IEC62271, etc. It has reliable lockage, used as truck department or fixed installation department.
2.Service condition
Normal condition
Ambient temperature +40℃~-15℃
Ambient humidity Daily average relative humidity ≤95%
Daily average stream pressure ≤2.2ⅹ10-3MPa
Monthly average relative humidity ≤90%
Monthly average stream pressure ≤1.8ⅹ10-3Mpa
Elevation ≤1000m
Degree of earthquake <8
The site has no water,no fire goods and explosion goods,no chemical goods and serious quake.
Special condition
If user has some special requirement, please negotiate by manufacture and user.
The main parameter of 12KV circuit breaker
| Rated voltage | 12kV | ||||
| Rated frequency | 50Hz | ||||
| Rated lighting impulse withstand voltage(between phases,phase to earth) /isolated fracture | (75) / 85kV (peak value) | ||||
| Rated 1min power withstand voltage(between phases,phase to earth) /isolated fracture | (42) / 48kV (r. m. s) | ||||
| Rated operation sequence | O-0.3s-CO-180s-CO | ||||
| Rated current (A) | 630,1250 | 1250~3150 | 1250~3150 | 3150,4000 | |
| Rated short circuit breaking current (r. m. s, kA) | 20/25 | 31.5 | 40 | 50 | |
| Rated short circuit making current (peak value, kA) | 50/63 | 80 | 100 | 125 | |
| Rated short time withstand current/short circuit continuous time (kA/s) | 20,25/4 | 31.5/4 | 40/4 | 50/4 | |
| Rated peak withstand current (kA) | 50/63 | 80 | 100 | 125 | |
| Breaking times of rated short circuit current(times) | 30 | 30 | 30 | 20 | |
| Mechanical duration (times) | 20000 | 20000 | 10000 | 10000 | |
| Weight (kg) | Fixed type | ≤200 | |||
| Truck type | ≤250 | ||||
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