高压开关柜发热故障分析及运维策略

Analysis of heating failure of high voltage switch cabinet and strategy of operation and maintenance

高压开关柜主要在主、配网电能转换过程中,起到开合、控制和保护用电设备的作用,是保障用户供电的重要设备。相较于其他变电设备,高压开关柜具有数量多、厂家多、型号多等特点。通过分析高压开关柜的发热故障及运维现状,并分别对新入网及存量设备的运维提出相应的策略。

This article deeply analyses and compares several processes of bridge differential protection action in GG I loop HVDC transmission project of an shun converter station. By searching the reason for protection action from the recorded wave shape, it is found that the type D converter secondary current waveform is seriously deviated to the side of time axis, which caused CT core in the secondary side of A bridge converter to deep saturation, and aiming at the solution for misoperation caused by bridge differential protection of converter, a solution is proposed which may be appropriate to improved by increasing the fixed value of the bridge differential protection （87CBY2） action. Through simulation on RTDS, the occurrence process of typical accidents is reproduced, the reason of disoperation is found out, and the software modification plan is pertinently put forward based on the analysis of typical examples, the impact of inrush current differential protection of bridge is avoid, the reliability of protection action is improved.