Overview
The ZW7-40.5 outdoor high-voltage vacuum circuit breaker is designed for three-phase power systems with AC 50Hz and a voltage of 40.5kV, used for breaking and closing load current, overload current, and short-circuit current.
Main Functions
1. Vacuum arc extinction is adopted, featuring strong breaking capacity, long electrical life, and a mechanical life of 10,000 operations;
2. Simple structure, maintenance-free, and long maintenance-free period;
3. Good insulation performance and strong anti-pollution capability;
4. Can be equipped with spring or electromagnetic operating mechanisms, with reliable mechanical performance and capability for frequent operation; no fire or explosion hazards;
5. Built-in current transformers with measurement accuracy up to Class 0.2, enabling three-phase interactive protection;
6. Equipped with a condensation controller to ensure reliable operation of the circuit breaker under certain temperature and humidity conditions.
Operating Environmental Conditions
1. Ambient air temperature: upper limit +40°C, lower limit -30°C;
2. Altitude: ≤2000m (if a higher altitude is required, the rated insulation level shall be increased accordingly);
3. Wind pressure: not exceeding 700Pa (equivalent to a wind speed of 34m/s);
4. Amplitude: seismic intensity of 8 degrees;
5. Pollution level: Class III;
6. Maximum daily temperature difference: not exceeding 25°C.
Main Technical Parameters
| No. | Item | Unit | Parameter | ||
| 1 | Rated voltage | kV | 40.5 | ||
| 2 | Rated insulation level | Power frequency withstand voltage | Dry | kV | 95 |
| Wet | 80 | ||||
| Lightning impulse withstand voltage (peak) | 185 | ||||
| 3 | Rated current | A | 1250, 1600, 2000 | ||
| 4 | Rated short-circuit breaking current | kA | 20, 25, 31.5 | ||
| 5 | Rated operating sequence | Open-0.3s Close Open-180s Close Open | |||
| 6 | Rated short-circuit current breaking operations | times (timcs) | 12 | ||
| 7 | Rated short-circuit making current (peak) | kA | 50, 63, 80 | ||
| 8 | Rated peak withstand current | ||||
| 9 | Rated short-time withstand current | kA | 20, 25, 31.5 | ||
| 10 | Rated short-circuit duration current | s | 4 | ||
| 11 | Average opening speed | m/s | 1.5±0.2 | ||
| 12 | Average closing speed | 0.7±0.2 | |||
| 13 | Contact closing bounce time | s | ≤3 | ||
| 14 | Three-phase closing (opening) simultaneity time difference | ≤2 | |||
| 15 | Closing time | ≤150 | |||
| 16 | Opening time | ≤60 | |||
| 17 | Mechanical life | times (timcs) | 10000 | ||
| 18 | Rated operating voltage and rated voltage of auxiliary circuit | V | DC220, 110, 24 | ||
| AC220, 110 | |||||
| 19 | DC resistance per phase circuit (excluding transformers) | μΩ | ≤100 | ||
| 20 | Allowable wear thickness of moving and static contacts | mm | 3 | ||
| 21 | Weight | kg | 800 | ||
