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Vacuum Circuit Breaker Accident Analysis For Technical Reasons 2011-09-26
(A) the actuator failure Actuator failure performance drag or Vacuum Circuit Breaker malfunction. High-voltage circuit breaker because the most basic and important function is the correct action and prompt removal of power failure. If drag or circuit breaker malfunction occurs, it will pose a serious threat to the grid, mainly: ① to expand the extent of the accident, may be only a loop expansion for the entire bus failure, or even the whole of the whole plant outage; ② If extended fault clearing time, will affect the operation of the system stability and increase the extent of damage to the controlled equipment; ③ cause-phase operation. Typically results in abnormal movements and to protect the grid oscillation phenomenon, easily expanded to large-scale power system incident or accident. Actuator failure leading to two main reasons: (1) actuator defects; (2) circuit breaker body mechanical defects; (3) operation (control) power supply deficiencies. (B) insulation accident Breaker insulation accident, an accident can be divided into inner and outer insulation insulation accident. The harm caused by the accident within the insulation, usually greater than the outer insulation. 1, an accident within the insulation Accidents within the insulating sleeve and current transformers are mainly accidents, mainly due to water moisture; followed by deterioration and fuel oil shortage. 2, external insulation accident Mainly due to an accident outside the insulation and flashover breaker flashover caused by lightning, explosion. Flashover is mainly due to leakage from the school a small vase, suitable for dirty areas; followed by oil leakage circuit breakers, oil spills, it is easy to accumulate on the ceramic skirt caused by contamination flashover. (C) breaking, closing performance of accident Breaking, closing task is the most severe test of the circuit breaker. Most breaking, closing the accident was attributed to the circuit breaker has obvious mechanical defects, followed by lack of oil or oil does not match the requirements. There are also drying up due to a lack of circuit breakers. But the former is more, because there are a considerable number of accidents occurred in the points, combined small-capacity, or even points, co-load current. (D) conductivity bad accident On-site analysis of the accident statistics show that the poor conductivity of failure was mainly caused by mechanical defects. Including: ① bad. Including contact surface not clean, the contact size and contact pressure is insufficient; ② off, jamming. Such as copper tungsten contact shedding; ③ contact at screw loose; ④ connection broken and so soft. If you want to know more,please enter the following links:Operating Mechanism .Earthing Switches
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