CAJ | 학술논문

电子式互感器在智能变电站应用中出现了不少问题，其中由周边电场所引起的杂散电容与邻近效应是影响电容分压型电子式电压互感器准确度的主要因素之一。首先分析了周边电场对电容分压型EVT准确度的干扰机理与数学模型，其次建立了典型在运电容分压型EVT的有限元计算模型，以此为基础仿真研究了杂散电容与邻近效应对其准确度的影响，并对高压端屏蔽罩的屏蔽效能进行了评估。仿真结果表明：地端杂散电容大于高压端杂散电容，杂散电容对EVT分压比的影响随着EVT与接地体之间的距离增大或三相EVT之间的距离增大而减小，EVT分压器的分压比和比值误差随着邻近相电压的增大而增大，高压屏蔽罩通过改善电位分布减小水平电场分量从而降低邻近效应的影响。所得结论对于EVT的优化设计具有参考价值。
전자식호감기재지능변전참응용중출현료불소문제，기중유주변전장소인기적잡산전용여린근효응시영향전용분압형전자식전압호감기준학도적주요인소지일。수선분석료주변전장대전용분압형EVT준학도적간우궤리여수학모형，기차건립료전형재운전용분압형EVT적유한원계산모형，이차위기출방진연구료잡산전용여린근효응대기준학도적영향，병대고압단병폐조적병폐효능진행료평고。방진결과표명：지단잡산전용대우고압단잡산전용，잡산전용대EVT분압비적영향수착EVT여접지체지간적거리증대혹삼상EVT지간적거리증대이감소，EVT분압기적분압비화비치오차수착린근상전압적증대이증대，고압병폐조통과개선전위분포감소수평전장분량종이강저린근효응적영향。소득결론대우EVT적우화설계구유삼고개치。
A lot of problems occur in the application of electronic transformer for smart substation, where stray capaci-tance and proximity effects caused by the surrounding electric field are the main factors for capacitive electronic volt-age transformer accuracy.Interference mechanism and mathematical model are analyzed firstly with studying the influ-ence of electric field on the accuracy of EVT.The finite element model of a typical capacitance-divide EVT in opera-tion has been built.The influence of stray capacitance and proximity effect on EVT accuracy has been simulated and the shielding effectiveness has also been evaluated for the high voltage terminal shield.The simulation results show that the stray capacitance of ground terminal is greater than the that of high voltage terminal, EVT divide ratio effected by stray capacitance will be reduced along with the enlarged distance between EVT or between EVT and grounded ob-jects, the divide ratio and ratio error will get greater when the voltage of adjacent phase increased, and the high volt-age terminal shield can reduce the influence of proximity effect by improving potential distribution which reduced the horizontal component of electric field.The conclusion can be taken as the ssvaluable reference for optimization design of EVT.