On-site diagnosis method of partial discharge for transformer equipment based on ultrasonic associated with electromagnetic wave and vibration test is studied. According to the structure and running condition of transformer and HV reactor

the on-site partial discharge detection based on ultra high frequency method

ultrasonic method and vibration test is carried out. Taking HV reactor in 500 kV line for example

the methods for on-site dectection

signal analysis and fault diagnosis are proposed. The research is helpful in determining the partial discharge of transformer and HV reactor

diagnosing the fault type and its severity

and improving the on-site detection level of equipment partial discharge

especially serious suspension discharge.