基于PSCAD的变压器复合电压启动的过电流保护原理仿真

Simulation of the Principle of Over Current Protection for Transformer Compound Voltage Starting Based on PSCAD

复合电压启动的过电流保护原理仿真是用来解决保护定值设定不合理而导致保护不能在相应区间内发挥最好作用的问题。文中模拟实际电力系统中变压器的复合电压启动的过电流保护,利用PSCAD软件搭建复合电压启动的过电流保护的仿真模型。模拟保护在发生对称短路和不对称短路时发生的波形变化。通过仿真验证了复合电压启动的过电流保护的正确性,并得出线路发生对称故障和不对称故障时的波形差异性,提出了对复合电压启动的过电流保护作为后备保护的看法。

The simulation of the current protection principle of the composite voltage is used to solve the problem that the setting value is unreasonable and the protection can not play the best role in the corresponding interval.In this paper,the over current protection of the transformer in the actual power system is simulated,and the simulation model of the PSCAD software is used to construct the over current protection.Simulation of the waveform changes in the occurrence of symmetrical short circuit and asymmetric short circuit.Through the simulation to verify the complex voltage start over current protection of correctness,and obtains the waveform differences between symmetric and asymmetric fault line,also puts forward the views to complex voltage start over current protection as a backup protection.