Zw8-12 vacuum circuit breaker
click£º Time£º2017-08-20
1. An overview of the
ZW8-12 series of outdoor high voltage vacuum circuit breaker (hereinafter referred to as the "circuit breaker") is a three-phase ac 50 hz outdoor high voltage switchgear;Mainly used for 10 kv system of rural electric network and city, as points and load current, overload current and short circuit current;Can also be used to other similar places.ZW8-12 series outdoor ac high voltage vacuum circuit breaker GB1984 conforms to the national standard "ac high voltage circuit breaker and IEC 60056 standards such as the high voltage circuit breaker.
2. Types and meanings
3.Conditions of use
3.1Normal conditions of use
A) the surrounding air temperature: - 40 ¡æ ~ + 40 ¡æ;
B) the altitude: not more than 2000 m;
C) the surrounding air can be affected by dust, smoke, corrosive gas, steam or salt fog pollution;
D) wind speed less than 34 m/s (the equivalent of 700 pa) on the surface of cylinder;
E) from the switchgear and control equipment in vibration or ground shaking is negligible;
F) pollution level: ¢ó level.
3.2Special conditions of use
Circuit breaker can be different from the normal use of the above provisions under the conditions of use, then the user's requirements with manufacturers to negotiate, and obtain the consensus of opinion.
3.3 such as beyond the normal conditions of use, by the user and the factory consultation.
4. The circuit breaker structure and movement theory
4.1 circuit breaker structure as shown in figure 3.
Circuit breaker operating mechanism, the conductive loop, insulation system, seal and shell.Overall structure for the three pole box, outlet and inlet line of conductive circuit consists of conductive rod, the clamp and the plate, the movement end can be connected with the vacuum arcing chamber, external insulation is mainly done by high pressure casing, capable to uncleanness, inner insulation composite insulation.Circuit breaker with the isolation knife (see figure 5), another three pole isolator (by another shaft drive) and the series of circuit breaker and isolating switch between a reliable mechanical interlocking device by mistake.Circuit breaker in the closing position, isolating switch points, closing operation can't;Circuit breaker in break-brake position, isolating switch points, closing operation can proceed.
4.2 action principle
Circuit breaker is made up of operating mechanism, as shown in figure 3.Institutions or 17 drive circuit breaker three pole break-brake spring spindle rotation 6, at the same time pull the insulation lever 15, 16 and turn arm make vacuum arcing chamber 8 movement contacts open or closed, and make the circuit breaker in the brake or close state.
Isolation knife by isolated knife shaft drive the knife in figure 5 points.Isolation between dao and circuit breaker is equipped with mechanical interlock, guarantee the isolation knife before the circuit breaker closed, and then for circuit breaker, the breaker in the closing state, the isolation knife cannot move, in figure 5 the isolation knife shaft 7 by another handle 5 operation.The isolation knife or other sign shows.
5. Technical parameters
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