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故障现象：定位时突然出现监视器无图像ｍＡ表无指示，透视ｋＶ表指示小于１０ｋＶ。检查分析：电源电压指示２２０Ｖ，透视ｋＶ小于１０ｋＶ，调查透视ｋＶ调节器旋钮，表针指示不动；踏下脚闸，透视继电器工作，ｍＡ表无指示。根据现象和线路分析初步判断：（１）透视继电器
Symptoms: There is no image on the monitor when positioning. There is no indication on the mA meter. The perspective of the kV meter is less than 10kV. Inspection and analysis: power supply voltage indication 220V, perspective kV less than 10kV, investigation perspective kV regulator knob, watch hands do not move; step foot gate, see through relay work, mA watch no indication. According to the phenomenon and the line analysis preliminary judgment: (1) perspective relay