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ZW8-12 (G)-serial vacuum circuit breaker is rated voltage 12KV, three-phase AC 50Hz outdoor high voltage switchgear is mainly used to breaking Closing Rural power network, city network and small power system load current, overload current, short-circuit current. The product of the overall structure is box-type three-phase, three-phase vacuum interrupter placed in metal boxes, using SMC insulation material and inter-phase insulation and ground insulation, reliable performance, high dielectric strength.
ZW8-12G is ZW8-12 a composite by circuit breaker and isolating switch, called the combination of circuit breakers, use for disconnect switches
This series of operating mechanism for the CT23-type spring operating mechanism energy storage can be divided into two kinds of electric and manual.
| No | Item | Unit | Data | |||
| 6.3kA | 12.5kA | 20kA | ||||
| 1 | Rated voltage | kA | 6.3 | 12 | 20 | |
| 2 | Rated current | A | 16 | 630(1250) | 50 | |
| 3 | Rated short-circuit breaking current | kA | 16 | 12.5 | 50 | |
| 4 | Rated short circuit closed current (peak) | kA | 6.3 | 31.5 | 20 | |
| 5 | Rated peak withstand current | kA | 31.5 | |||
| 6 | Rated short-circuit withstand current | kA | 12.5 | |||
| 7 | Rated insulation level | power frequency withstand voltages (dry) | 42 | |||
| Lightning impulse withstand voltage (peak) | 75 | |||||
| 8 | Rated operating sequence | O-0.3s-CO-180s-CO | ||||
| 9 | Mechanical life | times | 1000 | |||
| 10 | Rated short-circuit breaking current breaking times | times | 20 | |||
| 11 | Rated closing voltage of operation mechanism | V | 110220 | |||
| 12 | Rated opening voltage of operation mechanism | V | 110220 | |||
| 13 | Contact distance | mm | 11±1 | |||
| 14 | Over stroke (compression length of contact spring) | mm | 3 (+1,-0.3) | |||
| 15 | Three phase closing and opening non-synchronism | ms | ≤2 | |||
| 16 | Contact closing bounce duration | ms | ≤2 | |||
| 17 | Average opening speed | m/s | 1.0±0.2 | |||
| 18 | Average closing speed | m/s | 0.7±0.15 | |||
| 19 | Opening time | m/s | 15-50 | |||
| 20 | Closing time | m/s | 25-50 | |||
| 21 | Resistance of main loop for each phase | µΩ | ≤0.06 | |||
| 22 | Permitted accumulate wear-thickness of dynamic and static contact | mm | ≤200 | |||
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