ZN28G - 12 Indoor Vacuum Circuit Breaker Three Phase AC 50HZ 12KV Rated Voltage
ZN28G-12 Indoor High-voltage Vacuum Circuit Breaker
General:
ZN28G-12 indoor AC high-voltage vacuum circuit breaker is an indoor switching equipment with three-phase AC 50HZ and rated voltage 12KV. It is used for the protection and control of power grid equipment and industrial and mining enterprises. Because of the special advantages of vacuum circuit breaker, it is especially suitable for frequent operation, or many times to break the short circuit current.
The vacuum circuit breaker has the advantages of simple structure and small volume, and the operating mechanism is the spring energy storage type. It can be operated by AC power or DC power supply, and up to three overcurrent trip devices can be installed. The circuit breaker adopts the integrated design of the operating mechanism and the circuit breaker body as the fixed installation unit. The vacuum arc extinguishing chamber part and the operating mechanism part are arranged front and back. The composite insulation overall structure is easy to install, no adjustment and little maintenance.
Technical Parameters:
| Items | Unit | Date | |||
| Rated voltage |
KV |
12 | |||
| Rated impulse withstand voltage | 75 | ||||
| Rated short-time power frequency withstand voltage (1min) | 42 | ||||
| Rated frequency | Hz | 50 | |||
| Rated short-circuit breaking current | KA | 20 | 25 | 31.5 | 40 |
| Rated current | A |
630 1000 1250 |
630 1000 1250 1600 |
1250 1600 2000 2500 |
1600 2000 2500 3150 4000 |
| Rated short-time withstand current | KA | 20 | 25 | 31.5 | 40 |
| Rated peak tolerable current | 50 | 63 | 80 | 100 | |
| Rated short-circuit making current (peak value) | 50 | 63 | 80 | 100 | |
| Secondary circuit power frequency withstand voltage (1min) | V | 2000 | |||
| Rated operation sequence |
O－0.3S－CO－180S－CO O－180S－CO－180S－CO (at 40KA) |
||||
| Rated duration of short circuit current | S | 4 | |||
|
Rated single/back-to-back capacitance bank breaking current Set breaking current
|
A | 630/400 | |||
| Rated short-circuit breaking current DC flow percentage | ≤35% | ||||
| Average closing speed | m/s | 0.6±0.2 | |||
| Average opening speed | m/s | 1.2±0.3 | |||
| Opening time | ms | ≤60 | |||
| Closing time | ms | ≤80 | |||
| Mechanical life | times | 10000 | |||
| Rated short-circuit breaking current breaking times | times | 30 | |||
| Allowable wear accumulate thickness of moving and static contacts | mm | 3 | |||
| Rated closing operating voltage | v | AC110/220 DC110/220 | |||
| Rated opening operating voltage | v | AC110/220 DC110/220 | |||
| Rated voltage of energy storage motor | v | AC110/220 DC110/220 | |||
| Contact opening distance | mm | 11±1 | |||
| Contact stroke | mm | 4±1 | |||
| Contact bounce time | ms | ≤2 | |||
|
Three - phase opening and closing heterogeneity |
ms | ≤2 | |||
| Opening contact rebound amplitude | ms | ≤3 | |||
| Main circuit resistance | Ω | ≤40 (≤25 at 40KA) | |||
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