备自投 meaning in English

bzt
spare power automatic switching

In the connection mode of distributed power supply and medium voltage double - looped network , the configuration of relay protection and safety automatic devices is analyzed , and the detailed cooperating relationship among current instantaneous break , over - current and spare power automatic switch device is also presented
摘要在分散式供电、中压双环网接线方式下，对继电保护和安全自动装置的设置进行分析，并说明电流速断、过电流和备自投装置的具体配合关系。
This unit is particularly designed for monitoring 400v feeder with backup automatic switch . it could accurately measure and calculate : voltage , current , frequency , active power , reactive power , power factor and energy . when bus gets into trouble , it can perform the function of automatic switching to backup power supply
该单元是特别针对400v馈线备自投而设计的，它具有测量母线的电压、电流、频率、有功功率、无功功率、功率因数以及有功电度、无功电度等电参数的功能；当母线出现故障（过压或欠压）时，能够完成两组母线的自动投切，即备自投的功能。