Product standard
The VF(R)-12 series medium voltage vacuum circuit breakers strictly follow the following national standards:
GB 3804-2004: Standard for high voltage load AC switchgear with rated voltage of 3.6kV to 40.5kV.
GB 16926-2009: Standard for high voltage load AC switchgear and fuse combination appliances.
Technical Parameters
| Item | Unit | Reference value | |||
| VF-12/T630-20 Vacuum load switch |
VFR-12/T125-50 Vacuum load switch-fuse combination |
VFH-12/T630-25 High breaking capacity vacuum switch |
VFHR-12/T125-50 High breaking capacity vacuum switch-tuse combination |
||
| Rated yoltage | kV | 12 | 12 | 12 | 12 |
| ightning impulse withstand voltage | kV | 75 | 75 | 75 | 75 |
| Rated insulation level 1min power-frequency withstand voltage | kV | 42 | 42 | 42 | 42 |
| Rated frecuency | Hz | 50/60 | 50/60 | 50/60 | 50/60 |
| Rated current | A | 630 | 125(fuse) | 630 | 125(fuse) |
| Rated short-circuit breaking current | kA | 50(fuse | 25(are suppreson chamber) | 25im pcesson harx | |
| Rated short-circuic making current (peak value) | kA | 50 | 63 | ||
| Rated short-time withstand current | kA | 20 | 25 | ||
| Rated withstand current (peak value) | kA | 50 | 63 | ||
| Rated breaking current of cable during charge | A | 16 | |||
| Rated breaking current of no-load transformer | kVA | 1250 | 1250 | ||
| Rated breaking take-over current | A | 3150 | 3150 | ||
| Breaking times of the rated short-circuit current | Times | ||||
| Mechanical life | M2 level | M2 leve | M2 leve | M2 level | |
| Weight | kg | 125 |
Operating conditions
Ambient temperature: -40°C to +40°C (less than 35°C within 24 hours)
Relative humidity: ≤95% (daily average), or ≤90% (monthly average)
Altitude: ≤1000 meters
Recommendations for selection of fuses and transformers
Fuses are designed to quickly cut off the circuit to protect the transformer from high current damage. Fuses can cut off the current in less than 10 milliseconds, with a maximum breaking capacity of up to 50kA, and are suitable for various power grid environments.
When selecting a fuse, pay attention to the following points:
- Current margin: The rated current of the fuse is recommended to be 1.6 times the actual demand to cope with current surges.
- Operation stability: Reserve additional margin to adapt to power grid fluctuations to ensure long-term reliability.
- Starting frequency: If used for high voltage motor protection, the motor starting frequency must be considered to prevent frequent starting from overheating and causing the fuse to fail.
Fuse Selection
| Primary voltage of the transformer(kV) |
Capacity of the transformer(kVA) |
Model of the fuse | Rated current of the fuse(A |
|
| Model for the domestic market | Model for international market | |||
| 6.6 | 200 | XRNT-10 | 12kV BDGHC | 31.5 |
| 250 | 40 | |||
| 300/315 | 50 | |||
| 400 | 12kV BDGHC | 63 | ||
| 500 | 80 | |||
| 630 | 90 |
Overall And Installation Dimension
Overall dimension of VF(R)-12(wheeled)indoor high-voltage alternating-current vacuum circuit breaker
| Cabinet width(mm) | P(mm) | A(mm) | B(mm) | C(mm) | E(mm) | φW(mm) |
| 650 | 150 | 500 | 530 | 490 | 203 | 35 |
| 800 | 210 | 650 | 680 | 640 | 278 | 35 |
| 1000 | 275 | 850 | 880 | 840 | 378 | 35 |
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