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When failure protection is selectively operated in the generator circuit breaker and reduce the role of another, more favorable movement in the probability of high voltage circuit breaker brings is to avoid or reduce the whole phase due to non-operation of high voltage circuit breakers the harm caused to the generator. In fact, the generator transformer wiring, the high voltage circuit breakers due to the high voltage rating (220 ~ 500kV), open circuit breaker phase distance large, three-phase mechanical linkage can not be made, not to mention every phase circuit breaker further will be multi-fracture, non-full-phase operation of high voltage circuit breaker even when the normal operation also occurs, there is no doubt that the high voltage circuit breaker phase running (running) will produce negative sequence current in the stator, and generator rotor magnetic field to withstand the negative sequence capability is very limited (negative sequence generator run limit under fault conditions (I2 / TN) 2t about 8s), can cause serious damage to the rotor. This accident occurred many times at home and abroad, our country from 1980 to the end of 1992 took place from 50, in 1991 only 12 cases occurred. Every time such an accident will cause serious damage to the rotor. For example: June 12, 1990, Shouyangshan Power Plant No.1 generator & transformer high side circuit breaker phase B of rejecting cause overheating of the generator rotor, rotor retaining ring appears 9.1mm wide cracks. The direct cause of the serious consequences of this is not a three-phase high-voltage circuit breaker mechanical linkage, and prone to open phase operation. At present, the generator breaker in the design and manufacture are considered the three-phase mechanical interlock to prevent the occurrence of non-full-phase operation. In addition, the fast operating characteristics of the generator circuit breakers, but also to ensure that an important reason for generator sets security. Inherent operation time together with the generator breaker protection operation time is about 75ms, when a fault occurs (such as a single-phase or two-phase fault), the generator circuit breaker operation and will soon remove the fault, effectively avoids generating units damage. Conversely, if there is no generator breaker, the generator will continue to provide more current imbalance until the de-excitation process is complete. The de-excitation process may last for a few seconds (5 ~ 20s), here the generator would have been severely damaged. Because studies show that, according to the national standard design of the unit, the critical time for single-phase operation are as follows: No-load running about 70s; about 6s at full load; the main transformer short circuit when the high-pressure side and a total (two-phase / three-phase) at approximately 4.5s. Thus, when there is no generator breaker, de-excitation process (especially brushless excitation system) duration (5 ~ 20s) has greatly exceeded the tolerance limit turbine.

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