Design of Selective Leakage Protection Circuit Based on Method of Amplitude Discrimination and Phase Discriminatio
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摘要: 提出了一种基于鉴相鉴幅方式的用于煤矿井下综采设备电控装置的选择性漏电保护电路的设计方案。该选择性漏电保护电路主要利用故障线路的零序电流与非故障线路的零序电流相位相反、故障线路的零序电流相位滞后零序电压相位的原理,通过比较零序电流与零序电压的相位及二者幅值与设定幅值的关系,实现了对煤矿井下综采设备电控装置的选择性漏电保护功能。实践表明,该电路适应能力强,应用灵活方便,安全可靠。Abstract: The paper proposed a design scheme of selective leakage protection circuit based on method of amplitude discrimination and phase discrimination for electrical control equipments of fully mechanized devices of coal mine underground.The selective leakage protection circuit applied the principle that the phase of zero-sequence current in fault line is in contrast to the one in non-fault line and the phase of zero-sequence current delays the phase of zero-sequence voltage in fault line.It realized function of selective leakage protection for electrical control equipments of fully mechanized devices of coal mine underground through comparison of phases of zero-sequence current and zero-sequence voltage as well as their amplitudes and the setted amplitude.The practice showed that the circuit has strong adaption ability,flexible application,and good reliability.
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