Indoor 25kv Vacuum Type Circuit Breaker High Voltage
VCB-12 Indoor type ac 25kv vacuum circuit breaker High Voltage Vacuum Circuit Breaker
Intorduction:
It is an indoor switchgear with three-phase AC 50Hz rated voltage of 12KV power system. It is used as protection and control unit for power equipment and industrial and mining enterprises. Applicable to places that require frequent operation at rated operating current, or multiple times to break short-circuit current.
The circuit breaker adopts an integrated design of the operating mechanism and the circuit breaker body, and can be used as a fixed installation unit, or can be equipped with a special propulsion mechanism to form a hand truck unit.
Features: small size, light weight, suitable for frequent operation
Main structure: vacuum interrupter, electromagnetic or spring operating mechanism, bracket and other components.
The main technical parameters:
| NO | Item | Units | Technical parameters | ||
| 1 | Rated voltage | KV | 12 | ||
| 2 | Rated short-duration power frequency withstand voltage | 42/48(Interphase, ground/fracture) | |||
| 3 | Rated lightning impulse withstand voltage | 42/48(Interphase, ground/fracture) | |||
| 4 | Rated frequency | Hz | 50 | ||
| 5 | Rated current | A | 630 1250 |
630 1250 1600 2000 2500 3150 |
630 1250 1600 2000 2500 3150 |
| 6 | Rated short-circuit breaking current | KA | 20/25 | 31.5 | 40 |
| 7 | Rated short-time withstand voltage | 20/25 | 31.5 | 40 | |
| 8 | Rated short circuit duration | S | 4 | ||
| 9 | Rated peak withstand current | KA | 50/63 | 80 | 100 |
| 10 | Rated short circuit closing current | 50/63 | 80 | 100 | |
| 11 | Secondary circuit power frequency withstand voltage (1min) |
2000 |
|||
| 12 | Rated single / back to back capacitor group breaking current | A | 630/400(40kA:800/400) | ||
| 13 | Rated capacitor bank closing current | 12.5 (frequency is not greater than) | |||
| 14 | Mechanical life | KA | 20000 | ||
| 15 | Rated current breaking times (electrical life) | 20000 | |||
| 16 | Rated short circuit current breaking times | times | 50(40KA≤30) | ||
| 17 | Dynamic and static contacts allow wear cumulative thickness | mm | 3 | ||
| 18 | Energy storage time | s | ≤10 | ||
| 19 | Contact opening distance |
mm
|
11±1 | ||
| 20 | Overtravel | 3.5±0.5 | |||
| 21 | Contact closing bounce time |
ms
|
≤2(40KA≤3) | ||
| 22 | Three-phase split/closed period | ≤2 | |||
| 23 | Average opening speed (contacts are separated by -8mm) |
m/s
|
1.2±0.2 | ||
| 24 | Main conductive loop resistance | 0.6±0.2 | |||
| 25 | Main conductive loop resistance | μΩ |
≤50(630A)≤45(1250A) ≤40 (1600,2000A)≤35 (2500A or more) |
||
| 26 | Rated operation sequence | 0-0.3s-Co-180s-Co | |||
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