The reason of we research the fault sealing of oil and gas fields is to open out the influence of many restricted condition on fault sealing, which avails exploration and exploitation of oil and gas.

我们研究油气田断层封闭性，是要揭示这多种制约条件对断层封闭性的影响程度，为油气勘探与开发工作服务。

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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 open-loop feedback portion of this circuit lets the microcontroller know that a fault condition exists on the line.

电路的开关反馈部分使微处理器分辨线路中存在的错误条件。

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