一种测量配电网电容电流的新方法

A NEW METHOD TO MEASURE CAPACITANCE CURRENT IN DISTRIBUTION NETWORK

介绍一种从 PT二次侧测量配电网电容电流的方法。即从 PT开口三角端分别注入不同频率的幅值相等的恒定电流 ,再分别测量开口三角端电压 ,经计算可得出配电网的电容电流值。这种方法可使电容电流的测量工作安全、快捷、准确 ,提高测量工作的效率。

On the basis of a large amount of tests and researches, a new method to measure the capacitance current in distribution network from the secondary winding of PT is presented. In this method, the secondary windings of PT are connected as an open delta and its primary windings are star connected.Three constant currents with different frequencies are injected into the open delta. Then the voltages across the open delta are measured respectively. Using the formulae given in this paper, the capacitance current of the distribution network can be calculated. The proposed method makes the measurement of capacitance current in distribution network safe, fast and accurate.