Overview of VF(R)-12
VF(R)-12 is a kind of indoor embedded high voltage AC vacuum load switch-fuse combination device. It is suitable for various power grids and operates safely and stably within its technical parameters. With advanced design, this device is widely used in modern power systems.
Product standard
VF(R)-12 Vacuum load switch conforms to the following standards:
GB 3804-2004: High-voltage load AC switches with rated voltage between 3.6 kV and 40.5 kV.
GB 16926-2009: Standard for high-voltage load AC switch-fuse combinations.
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
Transformer and fuse selection
Fuses have the ability to cut off high currents in less than 10 milliseconds and have a breaking capacity of up to 50KA, which makes them effective in protecting transformers. When selecting fuses, it is important to consider that the fuse current needs to be 1.6 times its rated value to cope with potential inrush currents. The designer should also allow a margin for the fuse, taking into account the fluctuations in the grid. If the fuse is to be used for high voltage motor protection, consideration should also be given to the frequency of motor start-ups, as frequent start-ups may result in the fuse not being able to cool down in time and thus failing.
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 |
