一种改进的配电变压器短路电抗在线检测方法

Improved method of online measuring for distribution transformer short circuit reactance

针对携带不平衡负荷的Y,yn0接线和D,yn11接线配电变压器,提出了改进的配电变压器短路电抗在线检测方法。该方法通过测量配电变压器在不同负荷情况下高压侧和低压侧的电压、电流,在线计算变压器的短路电抗。该方法不受高/低压侧的电压、激磁电流变化和负荷不平衡度的影响。利用MATLAB/Simulink对所提方法进行仿真,结果显示在三相负荷不平衡的情况下,采用所提方法可精确计算绕组短路电抗。

An improved method is proposed for the online measuring of distribution transformer short circuit reactance with unbalanced load in Y,yn0 or D,ynll connection mode,which,immune to the variation of voltages and exciting current and the load imbalance,online measures the voltages and currents of distribution transformer with different loads and calculates its short circuit reactance. Simulation is carried out with MATLAB/Simulink and results show that,the short circuit reactance can be calculated accurately by the proposed method in the condition of extremely high load unbalance degree.