发变组主变高压侧非全相运行电气特征及其对保护的影响

摘要

When the power transformer high voltage side outgoing line occurs single-phase or two-phase ground fault, in the process awaiting reclosing after the fault phase is cut off or the main transformer high voltage side outgoing line occurs one or two phase broken, generator transformer group is in the open phase running state. This paper analyzes the characteristics of voltage and current of generator using sequence component, verifies the analytical results according to the recorded data, and proposes the effect on generator transformer relay protection. According to the results of the analysis, it puts forward some attention and prevention measures on open phase operation, which is conducive to the safe and reliable operation of power system.%针对发电厂主变高压侧出线发生单相或两相接地故障，故障相切除后等待重合闸过程或主变高压侧出线一相或两相断线，发变组处于非全相运行状态，利用序分量法分析发电机机端电压、电流的特征，并根据录波数据进行验证，提出发变组非全相运行对发变组继电保护的影响。根据分析结果，提出发电机组在非全相运行时的注意事项及防范措施，保证发电机组安全可靠运行。