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 indoor armored air-insulated switch cabinets. In normal conditions, it can operate within its technical parameters in any grid of the specified voltage level safely and stably.
Product Description
Technical Parameter
| 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-fuse combination |
|||
| Rated voltage | kV | 12 | 12 | 12 | 12 | |
| Rated insulation level | Lightning impuse withstand voltage | kV | 75 | 75 | 75 | 75 |
| 1min power-frequency withstand voltage | kV | 42 | 42 | 42 | 42 | |
| Rated frequency | 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 | 25 | |
| Rated short- circuit
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 level | M2 level | M2 level | ||
| Weight | kg | 125 | ||||
Transformer capacity and fuse selection
1.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 efectively.
2.In terms of match between the transformer and the fuse (Table 1), the potential surge current of the fuse must be considered. Thus, fusing current of the fuse must be 1.6 times of the rated value; designer must consider possible fluctuations of other parameters of the grid and reserve margins for them. If a fuse is selected for high-voltage motor protection, designer must consider frequency of start of the high-voltage motor because frequent starts of the high-voltage motor will result in the fuse’s failure when timely cooling is not available.
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 | |||
product description
| Standard | 1.GB 3804-2004 High-voltage load alternating-current switches for rated voltage above 3.6 kV and less than 40.5 kV
2.GB 16926-2009 High-voltage load alternating- current switch-fuse combinations
|
| Operating conditions | 1. Ambient temperature: – 40℃-+40℃ (below 35℃ within 24 hours)
2. Relative humidity:≤95% (daily average) or≤90% (monthly average) 3.Altitude: ≤1000m |
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