Overview
VXH1-12 series indoor AC high-voltage vacuum circuit breaker is a three-phase AC 50Hz, rated voltage 12KV indoor high-voltage VCB used in switchgears.
It is widely used in the control and protection of power supply and distribution systems in power plants, substations, petrochemicals, metallurgy, manufacturing, and residential areas, and is especially suitable for places with frequent operations and multiple short-circuit current interruptions at rated current. The three-phase pole adopts solid-sealed pole insulation (that is, through the APG process, the vacuum interrupter and the main conductive circuit are directly sealed in the epoxy resin pole using epoxy resin to form a solid-sealed insulation method). It can be designed as a fixed installation unit or equipped with a special propulsion mechanism to form a trolley unit.
Use environment
1. Ambient temperature: not higher than 40℃, not lower than -15℃.
2. Altitude: not more than 2000m.
3. Relative temperature: daily average value is not more than 95%, monthly average is not more than 90%.
4. Earthquake intensity: less than 8.
5. The environment should be no fire, explosion, serious pollution, chemical corrosion and severe vibration.
Appearance and installation dimensions
Main Parameters
| NO | Item | Units | Parameters | |||
| 1 | Rated voltage | kV | 12 | |||
| 2 | Rated Frequency | Hz | 50 | |||
| 3 | Rated Lighting Impulse voltage tolerance(peak) | kV | 75 | |||
| 4 | Rated short-time power-frequency voltage toltage tolerance(1min) | kV | 42 | |||
| 5 | Rated current | A | 630,1250 | 630,1250 | 1250,1600 | 1600,2000 |
| 2500,3150 | ||||||
| 4000,5000 | ||||||
| 6 | Rated short-circuit breaking current | kV | 20 | 25 | 31.5 | 40 |
| 7 | Rated short-circuit closing current(peak) | kV | 50 | 63 | 80 | 100 |
| 8 | Rated short-circuit duration time | S | 4 | |||
| 9 | Rated operating sequence | O-0.3s-CO-180s-CO O-180s-CO-180s-CO(40kA) | ||||
| 10 | Rated a single/back-to-back electric current breaking device group | A | 630/400 | |||
| 11 | Rated short-circuit breaking current breaking number | Operations | 30 | |||
| 12 | Closing time | ms | 35~70 | |||
| 13 | Opening time | ms | 20~50 | |||
| 14 | Mechanical life | Operations | 10000 | |||
| 15 | Rated storage and operation voltage | V | AC220/110DC220/110 | |||
| 16 | Contact distance | mm | 11±1 | |||
| 17 | Contact over travel | mm | 3.5±0.5 | |||
| 18 | Average closing speed | m/s | 0.5~0.8 | |||
| 19 | Average opening speed | m/s | 0.9~1.2 | |||
| 20 | Contact closing spring time | ms | ≤2 | |||
| ≤≤21 | Three phase closing opening asynchrony | ms | ≤2 | |||
| 22 | Lead circuit resistance | μΩ | ≤50(630A)≤45(1250A) | |||
| ≤35(1600~2000A)≤25(2500以上) | ||||||