摘要
根据消弧线圈和故障转移灭弧装置的优缺点,提出了一种残余电流转移的消弧方法。该方法首先利用消弧线圈将故障点电流补偿到较小数值,再投入故障转移装置转移故障点的残余电流,使电弧可靠熄灭。为了避免转移装置错误投入带来负面影响,采用两级开关结构,并用限流电阻对第一级合闸电流进行限制。通过检测限流电阻的电压或电流,可实现转移装置投入正确性以及电弧是否熄灭的判别,为故障转移装置的投退提供了可靠依据。仿真结果表明,该方法能够解决消弧线圈残流过大的问题,同时也能够避免故障转移装置错误投入带来的风险。
According to the merits and drawbacks of the arc-suppression coil and the fault transfer device,an arc suppression method based on transferring residual current is proposed in this paper. The fault point current is compensated to a smaller value by arc suppression coil,and then,the residual current of the fault point is transferred by the fault transfer device,so that the arc is reliably extinguished. In order to reduce the negative impact of the false action of the transfer device,a two-stage switch structure is adopted and the current-limiting resistor is used to limit the current of the first stage.By detecting the voltage or current of the current-limiting resistor,it can distinguish the correctness of the transfer device action and whether the arc is extinguished,which provides a reliable basis for the control of the fault transfer device. The simulation results show that this method can reduce the residual current of fault point and can also avoid the risk of false action by the residual current transfer device.
引文
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