WJJL1 intelligence over current relay is a typical electronic apparatus which has over current, short circuit, over voltage, under curent, phase faults and starting failure protective functions.

WJJL1智能过流继电器是典型的电子、电器技术相结合的产品。 具有过电流、短路、缺相、过欠压、欠电流、相失衡及启动故障等保护功能。

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In protect circuit, the paper bring forward to many protective measures such as over-current, over-voltage.

在保护电路中，本文提出了较为全面的过流、过压及过热等保护措施等方案。

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