◆General
VF(R)-12 indoor embedded high-voltage alternating-current vacuum load switch-fuse combination(“vacuum load switch”)is a new-generation vacuum switching equipment developed based on unique design ideas to meet the market demand.It is widely used for indoorarmored air-insulated switch cabinets.In normal conditions,it can operate within its technical parameters in any grid of the specified voltagelevel safely and stably.
The VF(R)-12 vacuum load switch is produced in line with the following standards and codes.
● GB 3804-2004 High-voltage load alternating-current switches for rated voltage above 3.6 kV and less than 40.5 kV
● GB 16926-2009 High-voltage load alternating-current switch-fuse combinations
◆Operating conditions
Normal operating conditions
● Ambient temperature:-40℃~+40℃(below 35℃ within 24 hours)
● Relative humidity:≤95%(daily average)or≤90%(monthly average)
●Altitude:≤1000m
| 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 | |||
● The fuse can cut off a large short-circuit current in less than 10 ms and its breaking current can be up to 50KA.Thus,it can protect the
transformer most effectively.
● In terms of match between the transformer and the fuse (Table 1),the potential surge current of the fuse must be considered.Thus,fusingcurrent of the fuse must be 1.6 times of the rated value;designer must consider possible fluctuations of other parameters of the grid and reservemargins for them.If a fuse is selected for high-voltage motor protection,designer must consider frequency of start of the high-voltage motorbecause frequent starts of the high-voltage motor will result in the fuse’s failure when timely cooling is not available.
| 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 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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