线路保护装置选型时应注意的3个参数

Attention to Three Parameters of Circuit Protection Device Selection

通过对一起低压电力电缆短路事故的分析,联系生产实际,强调在对低压线路保护装置设计与选型时,一定要重视过流脱扣与被保护线路的配合、断路器保护的灵敏度、断流能力这3个参数的校验工作,确保线路保护装置动作及时、可靠。

By analyzing a short-circuit accident of low voltage power cable,combined with the production practice,it was emphasized that when designing low voltage cable protection device and selecting types,the chec-king of three parametres including coordination between over-current release and protected circuit,sensitivity of cir-cuit breaker protection and cutoff capability must be attached importance to,so that the circuit protection device could act timely and reliably.