As backup power supply of the DC system, the residual capacity of battery effected safe operation of DC system directly when ac power failure occurs.
蓄电池作为直流系统交流停电时的后备电源，其剩余容量直接影响了直流系统的安全运行。
The power supply of the system is provided by the batteries being measured and the standby batteries, solving the problem associated with AC mains turning off during battery discharging.
该装置不需外接电源，而是利用被测电池加备用电池提供系统电源，解决了由于放电阶段停电而引起的问题。
The abnormal failure of battery which works as the backup power supply for DC system when ac power failure occurs, will affect the safe operations of DC system seriously.
蓄电池作为直流系统交流停电时的后备电源，其非正常失效严重影响了直流系统的安全运行。
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