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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The service, which begins Monday, has one drawback: it consumes as much battery power as normal cell phone rings.

此项服务于7月7日开通，但它目前的一个缺点就是耗电量相当于播放一般手机铃声。

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Under normal operating conditions, the main generators supply electrical power through distribution buses to the main step-up transformers and the unit station service transformer;

正常运行时，发电机发出电能至配电母线，然后通过主变压器和厂用变；

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