自然直流小电流选线系统中的漏电流初步研究

The introduction analysis of grounding current in nature DC small current choice line system

将非正弦周期检测信号分为三分之一周期内的正弦信号,先分析出零序直流选线系统的漏电压的瞬时分量,再计算出漏电压多次谐波分量及其有效值,进而得出漏电流随漏电阻变化的关系,建立以漏阻为负载的等效电源电路模型与数学模型,揭示自然直流小电流选线系统中的漏电流随漏阻的变化关系及其漏电流在漏电保护中的意义。

This paper divides the non-sinusoidal cycle detection signal into sinusoidal signal within 1/3 of the cycle. First,it analyses the instantaneous weight of creepage voltage in zero sequence DC selective line system.and count time after time harmonic weight,virtual value of creepage voltage,enduce the connection between creepage current and creepage resistance.It also builds equivalent power circuit model,math model which takes creepage resistance as load,and reveals the connection between creepage current and creepage resistance in natural DC small current choice line system and the meaning of ereepage current in creepage protection.