Time-frequency Vibration Characteristics Analysis of Disconnectors of GIS Equipment with Poor Contact Mechanical Defect
Hui Xu, Chujun Meng, Qinqing Huang, Chuanxian Luo, Jing Zhang, Zhixiang Liu
Abstract
GIS equipment disconnector is the valve of the power system, and its mechanical vibration defect is a key factor that threatens the safe operation of the power grid. Based on the GIS equipment platform, this paper carried out the simulation of the mechanical vibration defects of the disconnector in different contact states, and compared and analyzed the evolution law of the time-frequency domain vibration map under the combined action of different load currents and the severity of the defects. The results show that the vibration response amplitude of the disconnector when the contact is poor is significantly larger than that in the normal state. As the severity of the defect increases, its frequency response band gradually widens, and there is a clear super-harmonic response near 1500 Hz. The feature analysis algorithm for the vibration signal can effectively characterize the degree of deterioration of the contact state of the disconnector. The more serious the defect, the higher the energy level of the signal, while the kurtosis and unevenness coefficient also increase significantly.