基于不接地配电网的零序电流在线融冰技术

Online Ice Melting Technology for Zero-sequence Current Based on Ungrounded Power Distribution Network

现有融冰方式无法解决融冰时的停电问题,针对此,将接地电抗器与可调电抗器设计为零序电抗一体装置,通过避雷线构成融冰零序电流回路,以解决融冰时的停电问题。以粤北山区某支线作为试点线路,根据覆冰线路参数设计出在线融冰装置,并在ANSYS软件中构造接地变压器模型,验证融冰方式的可行性。结果表明该装置可利用零序电流产生的焦耳热对导线融冰,通过连续调节可调电抗器的阻抗实现融冰电流的连续调节,进而实现融冰时间连续可控,且在融冰期间对负荷侧的电压不产生影响,从而实现不停电融冰,大大减少现有融冰时因停电造成的经济损失。

To solve the problem of power cut during ice melting by current ice melting methods,this paper designs an integrated device combining the grounding reactor and the adjustable reactor as a zero-sequence reactor which uses the lightning protection wire to form the ice melting zero-sequence current loop to solve the problem of power cut.Taking a branch line in the mountainous area of Guangdong as a pilot line,the paper designs an online ice melting device according to the parameters of the icing lines,and constructs a ground transformer model in ANSYS software to verify the feasibility of the ice melting method.The results show that the device can use the Joule heat generated by the zero-sequence current to melt ice on the wire,and continuously adjust the impedance of the adjustable reactor to achieve continuous adjustment of the ice melting current,thereby realizing the continuous controllability of the ice melting time,which will not affect the voltage on the load side during ice melting,realize ice melting without power failure and greatly reduce the economic loss caused by the power failure.