【摘要】 在谐振接地系统中,系统高压侧不对称故障及负荷的不对称会引起系统电源电势的不对称,从而改变中性点位移电压。消弧线圈自动跟踪补偿装置在这些情况下,无法准确判断系统电容电流的变化。分析了系统高压侧不对称故障及负荷的不对称对中性点位移电压的影响,采用对称分量分析方法,得出三相对地电压、对地电容以及中性点电流之间的关系,在此基础上提出了准确判断系统电容电流变化的方法及其实现过程。更多还原

【Abstract】 In resonant ground systems, both asymmetric fault of high-voltage side and asymmetry of load cause the asymmetry of system electrical source voltage. Then they change neutral displacement voltage. The automatic tracking compensating device of Peterson Coil cannot truly judge whether the capacitance current in power system changes. Thispaper analyzesthe reasons that asymmetric faultofhigh-voltage side and theasymmetryofload affect the neutral displacementvoltage. The equation of phase-to-ground voltages, totalphase-to-groundcapacitance and neutral current is obtained with symmetrical-component method. Based on this, a method to judge the real change of the capacitance current and its realizable process are proposed.更多还原