CAJ | 학술논문

在相量法的基础上，为了解决其测量系统对地电容范围小和频率组合选取困难的问题，改进了测量配电网电容电流的方法，并给出了新方法的频率选取和误差分析。改进后的方法提出在PT开口三角侧分别注入一个高频和一个低频的幅值恒定的电压信号，并测量开口三角侧的零序电流。根据等效电路，计算出配电网对地电容。理论分析和仿真试验表明：改进后的测量方法具有计算简便、测量精度高，同样适用于测量较大系统的对地电容等特点，使得中压配电网电容电流的测量更加准确、快捷。
재상량법적기출상，위료해결기측량계통대지전용범위소화빈솔조합선취곤난적문제，개진료측량배전망전용전류적방법，병급출료신방법적빈솔선취화오차분석。개진후적방법제출재PT개구삼각측분별주입일개고빈화일개저빈적폭치항정적전압신호，병측량개구삼각측적령서전류。근거등효전로，계산출배전망대지전용。이론분석화방진시험표명：개진후적측량방법구유계산간편、측량정도고，동양괄용우측량교대계통적대지전용등특점，사득중압배전망전용전류적측량경가준학、쾌첩。
In order to solve the problems that the scope of the measurement range of capacitance is limited and to select the proper frequency is difficult, based on the phasor method, a novel method is proposed and the frequency selection and error analyses are given as well. In the improved method, a high and a low frequency amplitude constant voltage signals are injected into PT open delta side, and the zero sequence current of the open the triangle side is measured. According to the equivalent circuit of the distribution network, the capacitance is calculated. Through theoretical analysis and simulation verification, the improved method has the advantages of simple operation and high measuring precision, and is suitable for the capacitance measurement of larger systems.