Product Overview
The ZW7-40.5kV/630A outdoor high-voltage vacuum circuit breaker is used in 50 Hz, 40.5 kV three-phase power systems for breaking and making load current, overload current and short-circuit current.
The ZW7-40.5kV/630A outdoor high-voltage vacuum circuit breaker adopts an outdoor post-type structure with a spring operating mechanism, featuring strong breaking capability and reliable operation; the ZW7-40.5kV/630A outdoor high-voltage vacuum circuit breaker is suitable for outdoor substations, urban and rural distribution networks and industrial & mining distribution systems, meeting the requirements of frequent operation and reliable protection.
Type Designation
Normal Service Conditions
1. Ambient air temperature: upper limit +40℃, lower limit -30℃ (general areas) and -40℃ (frigid areas); 2. Altitude: ≤1000 m (if the altitude increases, the rated insulation level shall be raised accordingly);
3. Wind pressure: not exceeding 700 Pa (equivalent to a wind speed of 34 m/s); 4. Seismic intensity: not exceeding degree 8;
5. Pollution degree: Ⅳ;
6. Maximum daily temperature difference: not exceeding 25℃.
Outline & Installation Dimensions
Technical Parameters (see table)
| No. | Item | Unit | Value | |
|---|---|---|---|---|
| 1 | Rated voltage | kV | 40.5 | |
| 2 | Rated insulation level | 1-min power-frequency withstand voltage | Dry test | 95 |
| Wet test | 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 | O-0.3s-CO-180s-CO | ||
| 6 | Number of rated short-circuit breaking operations | operations | 12 | |
| 7 | Rated short-circuit making current (peak) | kA | ||
| 8 | Rated peak withstand current | kA | 50;63;80 | |
| 9 | Rated short-time withstand current | kA | 20;25;31.5 | |
| 10 | Rated duration of short circuit | s | 4 | |
| 11 | Contact gap | mm | 22±2 | |
| 12 | Contact overtravel | mm | 4±1 | |
| 13 | Average opening speed | m/s | 1.5t0.2 | |
| 14 | Average closing speed | m/s | 0.7+0.2 | |
| 15 | Contact closing bounce time | ms | ≤2 | |
| 16 | Three-phase closing (opening) synchronism time difference | ms | ≤2 | |
| 17 | Closing time | ms | ≤150 | |
| 18 | Opening time | ms | ≤60 | |
| 19 | Mechanical endurance | operations | 10000 | |
| 20 | Rated auxiliary-circuit voltage at rated operating voltage | DC110/220、AC110/220 | ||
| 21 | DC resistance per phase (excluding CT) | μΩ | ≤100 | |
| 22 | Weight | kg | 800 |
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