Bolt looseness fault diagnosis of GIS based on vibration signal amplitude

The mechanical fault in gas insulated switchgear (GIS) will cause abnormal vibration of equipment. Based on the vibration signal generated by abnormal vibration, a method for mechanical fault diagnosis of GIS is presented to achieve on-line mechanical fault diagnosis. Firstly, for the typical mechanical faults of GIS, the vibration mechanical characteristics are analyzed in depth. Secondly, based on the amplitude ratio characteristics of different points in the system, which is only related to the natural frequency and the main vibration mode, a signal processing method taken amplitude ratio as a feature is presented. Finally, on a simulation experiment platform, different test points are set up to extract the vibration signal, the composite matrix with the amplitude ratio of vibration signal as a feature is constructed and the feature is input into support vector machine to realize the mechanical fault diagnosis of GIS. The experimental results show that, the feature can be recognized effectively and accurately by using the typical fault types set.