ZW20-12F/TD- series outdoor high-voltage vacuum circuit breakers (hereinafter referred to as circuit breakers) are outdoor distribution equipment with rated voltage of 12kV and three-phase AC of 50Hz. It adopts vacuum arc extinguishing and As an insulating medium, SF6 gas is an improved product of ZW20-12F post vacuum circuit breaker. The gas sealing, explosion-proof and insulation structure technology imported from Japan Toshiba VSPS is adopted. The sealing performance of the inlet and outlet conduit has also been improved, and the overall sealing performance is excellent. The SF6 gas filled inside does not leak and is not affected by the external environment; Its spring operating mechanism is miniaturized and Reliability and stability optimization, using direct chain main drive and multi-stage tripping system, the action reliability and stability are improved several times compared with the traditional spring operating mechanism in China; Axis and sleeve of main circuit The contact between them adopts the adduction and extension bracelet structure, and the contact resistance of the main circuit is small and the temperature rise is low. Therefore, ZW20-12F outdoor post vacuum circuit breaker is a maintenance-free product, which is a post break The best product in road equipment.
Compared with ZW20-12F, ZW20-12F also adds overcurrent protection and mechanism spring energy storage indication, and is equipped with aviation socket for secondary electrical connection, which is convenient to combine with intelligent controller, fine The electrical and mechanical properties make ZW20-12F outdoor post vacuum circuit breaker widely used. It is mainly used to switch on and off the load current and short-circuit current of 10kV power system, and is suitable for transformer It is used for protection and control in distribution systems of power stations and industrial and mining enterprises, and is more suitable for places where power grids are frequently operated. This product is matched with the controller and has excellent recloser function, which can meet the automatic distribution Chemical system requirements.
Main features
1.high reliability
2. It is completely maintenance-free during the whole life
3. It has high mechanical life and electrical life
4. The whole machine is small in size, light in weight and easy to installed in medium voltage overhead power grid, as a sub-, Combined with load current, overload current and short circuit current.
Normal use environment
1. Ambient air temperature:-30°C ~+60°C;
2. Altitude: ≤ 3000 m;
3. The wind speed shall not exceed 34m/s;
4. Vibration or ground motion from the outside of switching equipment and control equipment can be ignored;
5. Pollution grade: Grade IV;
6. Storage temperature: -40
Advantages
1 - with reliable interlock functions, suitable for frequent operation
2 - low noise and energy consumed
3 - simple and robust construction.
4 - high operating reliability
Fields of application
1 - Transformers and distribution substations
2 - Generator control and protection
3 - Capacitor bank control and protection, etc
mechanical parameter
| Rated voltage |
12KV |
Over-current trip rated current |
5A |
| Rated current |
630/1000A |
Mechanical life |
10000times |
| Rated frequency |
50HZ or 60HZ |
Cumulative thickness of allowable wear of dynamic and static contacts |
3mm |
| Rated short circuit breaking current |
20/25KA |
Rated current of overcurrent release |
5A |
| Rated short-circuit closing current(peak value) |
50/63KA |
current ratio of current transformer |
200/5
400/5
600/5 |
| Rated short-term withstand current |
20/25KA |
Contact spacing |
9mm |
| Rated peak withstand current |
50/63KA |
Contact stroke of contact |
2.5±0.5mm |
| Rated short-circuit breaking current breaking times |
30times |
Average opening speed |
1.2±0.2m/s |
| Rated short circuit duration |
4s |
Average closing speed |
0.6±0.2m/s |
| Rated operating voltage |
AC/DC220V |
1 min power frequency withstand voltage of secondary circuit |
2000V |
| Rated operating sequence |
point-0.3-cimbined points-180s-combined points |
Rated current cut-off times |
10000times |
| Closing bounce time |
≤2ms |
The sated pressure of SF6 gas |
0MPa |
| Rated insulation level |
1 min power frequency withstand voltage |
Dry type |
42/48 |
Weigh |
140kg |
| Wet type |
34 |
| Secondary circuit to ground |
2 |
| Lightning impulse withstand voltage (peak value) |
75/85 |
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