Suitable for steep wave gis insulating invasive online monitoring diagnostic method and apparatus

The present invention relates to a method suitable for online monitoring and diagnostic apparatus steep wave intrusion GIS insulated, which method comprises the steps of: S1, broadband and narrow-band high-frequency current sensor a current sensor apparatus in the GIS sleeved ground line; S2, the ultrasonic sensors are arranged next to the supporting insulators in the plenum; S3, a current sensor narrowband signal within the received frequency range 20kHz-3MHz, denoted by time T1, referred to as the maximum amplitude A1, a high-frequency current sensor received wideband frequency range signal, denoted time 1MHz-50MHz to T2, the maximum amplitude denoted as A2; denoted a = A1-A2, T = (T1 + T2) / 2; S4, if a & gt; 0, it indicates to GIS insulating less damage, may continue to monitor; S5, if A & lt; 0, the alarm shall; GIS insulation defect type is determined based on the characteristic quantity. The present invention employs Electro acoustic wave voltage is steep manner invasive online monitoring the GIS insulated equipment, real-time monitoring of insulation failure on the GIS device, having a significance for improving reuse operation safety and reliability of the power system.