Introduces the constitutes of low voltage protection system of distributing transformer, analyzes the failure reason, puts forward concrete measures of improving low voltage protective reliability.

介绍了配电变压器低压保护的组成，对故障原因进行了分析，提出了提高低压保护可靠性的具体措施。

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In power IC, crosstalk between high voltage power devices and low voltage devices can cause circuit operation failure and even latch-up.

在功率集成电路中，高压功率器件会对周围的低压电路产生串扰，从而造成电路失效甚至闭锁等现象。

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But the invasion of lightning surge may lead its failure due to its low voltage withstand level which may affect the normal service power system.

微机保护系统是电力系统的重要组成部分，但由于其耐压水平低，雷电波侵入电源系统时易导致设备的损坏，严重影响了电力系统的正常运行。

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