Product Overview
The ZW8-12 series vacuum circuit breaker is a high-voltage outdoor switchgear with a rated voltage of 12kV and three-phase AC 50Hz. It is mainly used to open and close load current, overload current, and short-circuit current in rural power grids, urban power grids, and small power systems. The overall structure of this product is a three-phase common box, with a three-phase vacuum arc extinguishing chamber placed inside a metal box. It uses SMC insulation material for phase insulation and ground insulation, with reliable performance and high insulation strength.
ZW8A-12 is a combination of ZW8-12 circuit breaker and isolation knife, called a combination circuit breaker, which can be used as a section switch.
The operating mechanism of this series of products is the CT23 spring energy storage operating mechanism, which is divided into electric and manual types.
Technical Specifications
Number Name Unit Data
6.3kA 12.5kA 20kA
Rated voltage kV 12
Rated current A 630
3 rated short-circuit load breaking current kA 6.3 12.5 20
4 rated short-circuit closing current (peak) kA 16 31.5 50
5 rated peak withstand current kA 16 31.5 50
6 rated short-time 1min withstand current kA 63 12.5 20
7 rated insulation level power frequency withstand voltage (dry-type) kV 42
Lightning impulse withstand voltage (peak value) 75
8 rated operation sequence -0.3S-on-off -180 S-on-off
9 mechanical life cycles 10000
10 rated short-circuit breaking current breaking times 30 times
11. Rated closing voltage of operating mechanism V 110220
12. Rated tripping current of operating mechanism A 110220
13 contact opening distance mm 11 ± 1
14 overtravel (contact spring compression length) mm 3-0.3+1.0
15 Three phase opening and closing asynchrony ms ≤ 2
16 contact closing bounce time ms ≤ 2
17 average opening speed m/s 1.0 ± 0.2
18 average closing speed m/s 0.7 ± 0.15
At the highest operating voltage of 19 opening times, s is 0.015-0.05
0.03-0.06 at the lowest operating voltage
20 closing time s 0.025-0.05
21. The resistance of the main circuit of each phase is less than or equal to 120 μ Ω
22. Allowable cumulative thickness of friction for dynamic and static contacts mm