◆General
ZN63(VS1)indoor high-voltage alternating-current vacuum circuit breaker has a frequency of 50Hz and a rated voltage of 12kV.It applies tothe electrical equipment control and protection in industrial and mining enterprises,power plants and substations,particulanty to the places needingfrequent operation.It can be fixed in a switch cabinet or installed on a handcart.
With stable performance and convenient installation,it is the best choice for the control and protection of high-voltage power transmission
and distribution systems.
ZN63(VS1)indoor high-voltage alternating-current vacuum circuit breaker is produced in line with the following standards and codes.
● IEC 62271-100 High-voltage alternating-current circuit-breakers
● GB/T 11022-2011 Common specifications for high-voltage switchgear and controlgear standards
● GB 1984 High-voltage alternating-current circuit-breakers
● GB 311.1 Insulation co-ordination for high voltage transmission and distribution equipment
◆Operating conditions
● Ambient temperature:-40℃~+40℃(below 35℃ within 24 hours)
● Relative humidity:≤95%(daily average)or ≤90%(monthly average)
● Altitude:≤1000m
1.1 Technical parameters
| Item | Unit | Reference value |
| Rated voltage | kV | 24 |
| ightning impulse withstand voltage | kV | 145 |
| Rated insulation level 1min power-frequency withstand voltage | kV | 65 |
| Rated frequency | Hz | 50/60 |
| Rated current | A | 630/1250/1600/2000/2500/3150 |
| Rated short-circuit breaking current | kA | 20/25/31.5 |
| Rated short-circuic making current (peak value) | kA | 506,380 |
| Rated short-time withstand current | kA | 20/25/31.5/40 |
| Rated withstand current (peak value) | kA | 506,380 |
| Required operation sequence | 0-0.3s-CO-180s-CO | |
| Rated short-circuit duration | S | 4 |
| Times of making-breaking with the rated short-circuit current | Times | 30 |
| Mechanical life | M2 level | |
| Weigh | kg | 150 |
◆Transformer capacity and fuse selection
●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 |
The actuator employs spring energy storage which can be done electricallyor manually.When the circuit breaker is operating,the energy generated by theenergy stor
age spring is transferred to the connecting rod mechanism throughan output cam and then to the movable contact through the connecting rodmechanism.The advanced and appropriate buffer avoids bounces in breakingand reduces the impact and vibration in breaking.The actuator almost needsno maintenance or adjustment.It can operate for up to 10,000 times.
Overall dimension of VS1-24(wheeled)embedded indoor high-voltage alternating-current vacuum circuit breaker
| Rated current(A) | 630 | 1250 | 1600 |
| Rated short-time withstand current(kA) | 202,531.5 | 2,531.5 | 31.5 |
| Fixed contact size D(mm) | φ35 | φ49 | φ55 |
| Interphase distance(mm) | 275±1.5 | ||
| Drive travel(mm) | 300±2 |
Overall dimension of VS1-24(fixed)indoor high-voltage alternating-current vacuum circuit breaker(large-current)
| Rated current(A) | 2000 | 2500 | 3150 |
| Rated short-time withstand current(kA) | 31.5 | 31.5 | 31.5 |
| Fixed contact size D(mm) | φ79 | φ109 | φ109 |
| Interphase distance(mm) | 275±1.5 | ||
| Drive travel(mm) | 300±2 |
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