欠电压 meaning in English

under voltage
undervoltage

Electrical installations of buildings part 4 : protection for safety chapter 45 : protection against undervoltage
建筑物电气装置第4部分:安全防护第45章:欠电压保护
4 release products : intelligent release , under voltage , transient or delay release and sub encourage release
4脱扣器种类：智能型脱扣器，欠电压瞬时或延时脱扣器和分励脱扣器
Mainly in the electricity distribution network for distribution lines so that power and protect equipment from overload , short circuit and under voltage , single - phase fault to other hazards
主要在配电网络中用于分配电能和保护线路使电源设备免受过载短路欠电压单相接地等故障的危害。
The signal sampling circuit fulfill the tasks of sampling signal and changing the double polarities signal to the single polarity signal ; the drive circuit receives the pwm signals from dsp and pass the signals to ipm through optical - couple devices ; the protective circuit safeguard the system against high current , high voltage , low voltage and high temperature on the ipm model
其中信号处理电路主要完成采集输出电流和中间直流环节电压信号，并对采集到的电流信号进行极性变换处理的功能；驱动电路接收dsp输出的高频驱动信号，通过耦合器件直接驱动ipm模块；保护电路利用采集到电气信号对整个系统实施保护，包括过电流、过电压、欠电压、 ipm模块过热等。