In order to prevent the undervoltage or overvoltage of the batteries the protection circuit was designed .

为防止蓄电池 欠过压，还对 相应 的 保护电路进行了设计。

Undervoltage on Line and Equipment and Their Protection

线路和设备的 欠 电压 与 保护

An undervoltage tripper is a very popular electrical protection device for universal breaker which will directly affect the normal operation of a breaker if it breaks down .

欠 电压脱扣器在万能式断路器上是十分常见的一件电压 保护装置，该装置的失效直接影响到断路器的正常运行。

An on line DC uninterruptable power supply ( ups ) with functions of ac / dc power fail warning and AC power overvoltage / undervoltage transcient overvoltage protection technology for the distributed system of intelligent instruments

交直流掉电预警及过、 欠 压 保护直流在线式UPS电源智能仪表集散系统的防雷技术

Malfunction of undervoltage memory overcurrent protection device of DRS generator is analyzed in this paper and improvement countermeasures are put forward to eliminate incipient safety fault .

通过对DRS型发电机 低压记忆过流 保护误动原因的分析，对 保护原理提出改进措施，消除了装置的安全隐患。

Then also designed undervoltage protection circuit and Clock Generation Circuit .

接着还设计了 欠 压 保护电路和时钟产生电路。