大容量发电机断路器主要特性分析

Key Characteristic Analysis of Generator Circuit Breakers for Large-Capacity

发电机断路器具有额定电流大、开断短路电流直流分量高、开断瞬态恢复电压(TRV)上升快等特点,分析了这些特点产生的原因,并阐述了目前解决这些特性问题的主要方法,即利用电弧特性避免短路电流长延时过零、断路器两端加装吸收电容限制TRV上升率,为大容量发电机选型提供参考。

Generator circuit breakers are with the characteristics such as large rated current, high direct current component of cut-off shortcircuit current and fast rising cut-off transient recovery voltage. This paper analyzed the causes of these characteristics and described the main methods solving these characteristic problems at present. The arc characteristics were used to avoid short-circuit current long time delay zerocrossing and the absorbed capacitance limitation was added at both ends of circuit breakers to confi ne the rising rate of TRV, so as to provide references for large capacity generators.