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Home/Vacuum Circuit Breaker/40.5kV Vacuum Circuit Breaker/40.5kV Floor Mounted Vacuum Circuit Breaker With VBI Spring-operated Mechanism 40.5kV Floor Mounted Vacuum Circuit Breaker With VBI Spring-operated Mechanism
VBI indoor high-voltage vacum circuit breaker is an indoor device with three-phase AC 50Hz and rated voltage of 40.5kV. It can be used for the control and protection of electrical equipment in industrial and mining enterprises, power plants and substations, especially for places with frequent operations. The installation form of the circuit breaker in the switch cabinet can be either a fixed type or a withdrawable type circuit breaker installed on a trolley.
VBI indoor high-voltage vacuum circuit breaker has reliable performance and is easy to install. It is the best choice for the control and protection of high-voltage transmission and distribution systems.
Electrical ProductsApplying ambient conditions of 40.5kV Floor Mounted Vacuum Circuit Breaker
1. Ambient air temperature: -40℃~+40℃, and no more than 35°C within 24 hours
2. Relative humidity: the daily average value is not greater than 95%; the monthly average value is not greater than 90%
3. Altitude:≤1000m
Technical Parameters of 40.5kV Floor Mounted Vacuum Circuit Breaker With VBI Spring-operated Mechanism
| No. | Item | Unit | Data | ||
| 1 | Rated voltage | KV | 40.5 | ||
| 2 | 1min rated short-duration power frequency withstand voltage | KV | 95 | ||
| 3 | Lightning impulse withstand voltage | KV | 185 | ||
| 4 | Rated frequency | Hz | 50/60 | ||
| 5 | Rated current | A | 630/1250/1600/2000/2500 | ||
| 6 | Rated short-circuit breaking current | KA | 20 | 25 | 31.5 |
| 7 | Rated short-circuit making current (peak value) | KA | 50 | 63 | 80 |
| 8 | Rated short-time withstand current | KA | 20 | 25 | 31.5 |
| 9 | Rated peak withstand current | KA | 50 | 63 | 80 |
| 10 | Rated short-time withstand current duration | S | 4 | ||
| 11 | Rated operating sequence | 0-0.3s-CO- 180s-CO | |||
| 12 | Rated short-circuit current breaking times | Times | 30 | ||
| 13 | Mechanical Life | Times | 10000 | ||
After adjusting the circuit breaker, the mechanical characteristic parameters are shown in table two
| No. | Item | Unit | Data |
| 1 | Contact opening distance | mm | 20±2 |
| 2 | Contact overtravel | mm | 6±1 |
| 3 | Average closing speed | m/s | 0.6±0.2 |
| 4 | Average breaking speed | m/s | 1.2±0.2 |
| 5 | Contact closing bounce time | ms | ≤3 |
| 6 | Contact Closing and Breaking Non-simultancous | ms | ≤2 |
| 7 | Circuit resistance per phase | μΩ | ≤80 |
| 8 | Permissible accumulated wear thickness of dynamic and static contacts | mm | 3 |
Overall Outline Drawing of 40.5kV Floor Mounted Vacuum Circuit Breaker
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