Method for preventing over-current protection misoperation of commutation reactance

The invention relates to a method for preventing overcurrent protection misoperation of a commutation reactor, which comprises the following steps of: 1, carrying out half-cycle absolute value integration on sampling data of a current transformer arranged on the commutation reactor; obtaining a half-cycle integral value S < full > (t1) calculated by taking the fault occurrence moment as a starting point and a half-cycle integral value S < full > (t2) calculated by taking the fault occurrence moment as a starting point after a period of time; and step 2, calculating S < full > (t2)-S < full > (t1), when S < full > (t2)-S < full > (t1) is greater than S < set > and continuously satisfies 3ms, locking over-current protection of the commutation reactor, and setting a setting value Sset according to 10% of a half-cycle integral value of a fundamental wave current when normal operation is avoided. 本发明涉及一种防止换相电抗过电流保护误动作的方法，包括下列步骤：步骤1：对换相电抗上安装的电流互感器采样数据进行半周绝对值积分，得到以故障发生时刻为起点计算的半周积分值S全(t1)和以故障发生一段时间后为起点计算的半周积分值S全(t2)；