Product Overview
The ZW32-12 series outdoor on-post AC HV vacuum circuit breaker (hereinafter referred to as circuit breaker) is an outdoor distribution equipment in maximum rated voltage of 12kV, and three-phase AC 50Hz. It is mainly used for breaking and switching the load current, overload current and short-circuit current in the power system; and suitable for protection and control of power distribution system in substations and industrial and mining enterprises, and places with frequent operation in the rural power grids.
Structural Characteristics
- Circuit breaker is used with three-phase pillar structure, and has advantages of stable and reliable breaking performance,compact size, light weight and long service life.
- The circuit breaker features totally enclosed structure, excellent sealing, moisture-proof, and anti-condensation.
- Three-phase pillar and current transformer are insulated with imported outdoor epoxy resin solid insulation, having advantages of high and low temperature resistant, UV resistant, and anti-aging.
- The operating mechanism is a miniature spring-operated mechanism, featuring low energy consumption for opening and closing; the mechanism drive is in mode of direct drive, featuring fewer opening/closing parts and high reliability.
Structural Characteristics
- The opening and closing of circuit breaker can be manually or electrically operated and remotely operated . The circuit breaker can be used to form complete set with the controller in realizing automation of distribution network.
- The circuit breaker can be used in combination with the power load monitoring system.
- The circuit breaker is externally installed with electronic PT. The electronic PT obtains current from the transformer and then converts the current to voltage, and provides protection and control functions.
Main Specifications and Technical Parameters
Performance parameter of circuit breaker
| No. | Description | Unit | Parameters |
|---|---|---|---|
| 1 | Rated voltage | kV | 12 |
| 2 | Rated frequency | Hz | 50 |
| 3 | Rated current | A | 630 1250 |
| 4 | Rated short-circuit breaking current | kA | 20 |
| 5 | Rated peak withstand current (peak) | kA | 50 |
| 6 | Rated short-time withstand current / duration | kA/S | 20/4 |
| 7 | Rated short-circuit making current (peak) | kA | 50 |
| 8 | Mechanical life | Number of cycles | 10000 |
| 9 | Breaking operations of rated short-circuit breaking current | Number of cycles | 30 |
| 10 | Power frequency withstand voltage (1min): (wet) (dry) phase-to-phase, phase-to-ground / fracture | kV | 34/42/48 |
| 11 | Lightning impulse withstand voltage | kV | 75 |
| 12 | Secondary circuit 1min power frequency withstand voltage压 | KV | 2 |
Mechanical characteristic parameter
| No. | Description | Unit | Parameters |
|---|---|---|---|
| 1 | Contacts spacing | mm | 9±1 |
| 2 | Contact over-travel | mm | 2±0.5 |
| 3 | Opening speed | m/s | 1.2±0.2 |
| 4 | Closing speed | m/s | 0.8±0.2 |
| 5 | Bouncing time of contactor closed | ms | ≤2 |
| 6 | Center distance between phases | mm | 340±1.5 |
| 7 | Time interval between opening of first and last phase of three phase circuit-breaker | ms | ≤2 |
| 8 | Phase-wise conductive loop resistance | μΩ | ＜80 |
| 9 | Closing time | ms | 25~60 |
| 10 | Opening time | ms | 18~45 |
| 11 | Rated power of energy storage motor | W | 40 |
Switch isolator parameters
| No. | Description | Unit | Parameters |
|---|---|---|---|
| 1 | Rated voltage | kV | 12 |
| 2 | Rated current | A | 630 |
| 3 | Thermal stability current (effective value) | kA | 20 |
| 4 | Dynamic stable current (peak) | kA | 50 |
| 5 | 1min power frequency withstand voltage | kV | 48 |
| 6 | Each phase loop resistance | μΩ | ＜60 |
| 7 | Non-synchronism at the instant of closing contact knife | mm | ＜2 |
