CAJ | 학술논문

分析了目前配电网电容电流测量方法所存在的问题，提出了一种偏置阻抗法测量电容电流的新方法。该方法通过在配电网中任意一相与地之间串入一固定电阻和可调电抗，调节电抗器，同时观察和测量中性点电压与偏置相对地电压的相角差，来配合电抗器的进一步调节，当该相角差接近90°时，即可精确地测量出电网对地参数。通过Matlab仿真和理论计算得到了一致的结果，同时验证了该方法能够取得比较精确的测量效果。该方法具有操作简单，测量精度高，不会引起中性点过电压等优点，可以应用于配电网电容电流的测量。
분석료목전배전망전용전류측량방법소존재적문제，제출료일충편치조항법측량전용전류적신방법。해방법통과재배전망중임의일상여지지간천입일고정전조화가조전항，조절전항기，동시관찰화측량중성점전압여편치상대지전압적상각차，래배합전항기적진일보조절，당해상각차접근90°시，즉가정학지측량출전망대지삼수。통과Matlab방진화이론계산득도료일치적결과，동시험증료해방법능구취득비교정학적측량효과。해방법구유조작간단，측량정도고，불회인기중성점과전압등우점，가이응용우배전망전용전류적측량。
A new capacitive current measurement method of the distribution network is proposed based on the analysis of the problems existed in the current capacitive current measurement methods. First, a fixed resistance and an adjustable inductor are installed in series between any one phase and the ground;second, the adjustable inductor is regulated, and at the same time, the phase angle difference between the neutral voltage and the bias phase voltage is observed; then the system ground capacitance and resistance can be calculated when the phase angle difference mentioned above is close to 90 degrees. The corresponding simulation is carried out by using Matlab, which obtains the same results with the theoretical calculation. The results show that this method is feasible. Apart from these, this method is operated simply, of high measurement accuracy, and not leading to neutral overvoltage. This method can be used in the capacitive current measurement in the distribution network.