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。
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。
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。
The operation characteristics and main failure modes of low-voltage circuit breaker were analyzed.
分析了低压断路器的工作特点和主要故障模式。
Failure ratio and success ratio degree were confirmed as the reliability indexes of low-voltage circuit breaker at the first time.
在此基础上首次提出了采用操作故障率等级与瞬动保护成功率等级作为低压断路器的可靠性指标。
The results show that when the battery is charged at low current and constant voltage, its failure mode is the sulphation of negative plate and the softening of positive plate;
用优选充电制度，电池失效模式是正极活性物质软化，板栅腐蚀相对较少。
It can extend the life of battery and decrease ups system failure rate to the problem of under-voltage, low capacity and discharge current not meeting load startup request.
主要针对UPS蓄电池段电压不够、容量不足或瞬间放电电流不满足带载启动要求等问题。可以延长蓄电池的使用寿命，降低UPS系统故障率。
It can extend the life of battery and decrease ups system failure rate to the problem of under-voltage, low capacity and discharge current not meeting load startup request.
主要针对UPS蓄电池段电压不够、容量不足或瞬间放电电流不满足带载启动要求等问题。可以延长蓄电池的使用寿命，降低UPS系统故障率。
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