Difference Analysis of Vibration Characteristics in Different Structural Units of Gis Equipment

Abnormal mechanical vibration occurs frequently in the operation of Gas Insulator Switchgear (GIS), and its vibration characteristics are affected by many factors, which seriously endanger the safe and stable operation of the equipment. To master GIS equipment vibration characteristics in different structural unit, this paper took the GIS in a substation as the test object. First, aiming at bus, circuit breaker, disconnector, arrester, current transformer, voltage transformer and so on different structural unit in the same interval, we carried out the vibration test and analysis. Then the influence of voltage grade and phase on vibration was studied.Finally,the reasons of vibration difference were analyzed combining electromagnetic force, magnetostriction and equipment structure.The results show that the frequency of normal vibration signals in the gas chamber of 220 kV GIS equipment is mainly 100 Hz, and the vibration of bus chamber is the most intense.The vibration waveform of PT and arrester is seriously distorted and contains many frequency-doubling components.However, the vibration spectrum of 500 kV GIS equipment is more complicated.The research results can provide reference for defect diagnosis and status evaluation of GIS equipment.