电气设备的过载及其保护

当变压器、电动机、电容器发生过载故障并超过允许时间时，因热效应等因素导致绝缘受损，进而引发短路，烧损设备。介绍了过载和耐受过载电流的时问、对过载保护采取的措施及对断路器、热继电器保护特性的选择。

The Overload and Its Protection in the Electrical Equipment

When the overload break-downs of transformer, motors, capacitors and exceeds the time allowed, due to heat effects etc factors, insulations were damaged, and further more short circuit was trigged, with equipment burnt and damaged. Introduction was made to the overload and time withstanding overload current; actions adopted for protection of overload and selections for circuit breakers and thermal relays for their protection charactoristics.