传统保护存在后备保护动作时间过长和不能区分线路过载与故障等不足。

The traditional protection has some shortcomings: long operation time of backup protection, not distinguishing overload from fault of line and so on.

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这样能得到最佳使用性能，并防止房屋电源线路过载，导致电线过热会引发火灾。

This provides the best performance and also prevents overloading house wiring circuits which could cause a fire hazard from overheated wires.

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电动机过载保护通常采用继电器，而配电线路过载保护多采用断路器的长延时过电流脱扣器来完成。

Protection against motor over - load usually adopt thermal relay, but protection against line over - load usually adopt long delay over- current release of circuit- breaker.

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