time-undervoltage protection

Discussion on Division of Groundwater's Waterhead Protection Zone By Time Criteria

试论地下水水源保护区划分的时间标准

At the same time, rulemaking can provide individuals with important protection.

同时, 规则制定可为个人提供重要的保障.

Many problems such as long time-delay, short life-span of thermocouple with protection tube, low accuracy of quick measuring thermocouple witch can not continuously work and low stability of mid-conductor thermocouple in uneven temperature fields have been effectively solved.

它有效地解决了保护管式热电偶滞后时间长、寿命短，快速测温偶测温精度不高、不能连续测温，中间导体式热电偶受温度场不均匀度影响较大的问题。

The method of modeling the action processes of protection relaying is proposed based on the extended time Petri net ( ETPN).

文中提出了一种基于扩展时间Petri网（ETPN）的继电保护装置动作过程建模方法；

Design and Realization of Distribution Protection System of Earth Leakage Circuit Breaker Based on Time Lag Action

基于延时动作的漏电保护开关分级保护系统的设计与实现