500kV某变电站运行人员运行监视中发现500kV线路后台电压指示为Uab529.26kV、Ubc525.94kV、Uca525.96kV，Uab电压明显偏高。随即对线路PT二次进行单相测量，发现A相二次电压高于其它两相0.84V。%The operating personnel of one 500kV transformer substation found that background voltage instructions of 500kV line was Uab529.26kV, Ubc525.94kV, Uca525.96kV, which showed that the Uab voltage was significantly higher. Then the secondary single-phase measurement of line PT was done and it found that the A-phase secondary voltage was higher than the other two phases 0.84V.
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