The existing defect of overload, open phase protection of minitype flameproof motor used in coal mine was analysed and its improved protection scheme was presented.

分析了煤矿井下小型隔爆电动机过载、断相保护存在的缺陷，提出了改进的保护方案。

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Based on the analysis of main fault types of LV (Low Voltage) flameproof motor, the negative sequence protection principle is proposed for its asymmetric short circuit fault and open phase fault.

通过分析低压隔爆电动机的主要故障类型，针对不对称性短路故障和断相故障提出了采用负序保护原理进行保护的方案。

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The RPG file open can occur implicitly during the RPG initialization phase or explicitly via the RPG open operation and the use of the USROPN keyword on the file definition.

RPG文件打开可以在RPG初始化阶段隐式发生，也可以通过RPG OPEN操作或在文件定义上使用USROPN关键字显式发生。

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Freedom movements generally go through three different phases: the organisational phase, guerrilla operations and the open-warfare phase.

ECONOMIST: Pakistan: Retreat | The

Freeze dates are defined as the observed period when a lake or river was completely ice-covered, and break-up dates as the last ice break-up seen before the summer open-water phase.

BBC: Ice records reveal warming trend

This phase is open to youth from across the world.

UNESCO: THEMES