Analysis and Study on the Fault of AC Isolating Switch's Voltage Equalizer Ring Falling off in 750 kV Substation
The voltage equalizing ring of AC isolating switches is widely used in 750 kV substations,but during its long-term operation,faults such as deformation,fracture,and detachment may occur under the influence of multiple factors in the natural environment.Through on-site investigation and simulation analysis,the causes of the voltage equalizing ring detachment fault of the AC isolation switch in a 750 kV substation were explored from the aspects of structural form,environmental factors,and material fatigue.The crack propagation path and velocity of the faulty component were obtained through the crack in the crack method.At the same time,based on historical weather data in the region,the direct impact of exceptionally severe weather on the malfunction has been ruled out.The results indicate that the malfunction is related to the combined effects of mechanical stress and environmental factors during long-term operation.This study has certain guiding significance for improving the safe operation level of high-voltage AC isolation switches,providing suggestions for the design and production of voltage equalization rings,and also providing reference for the prevention and treatment of similar faults.
voltage equalization ringsimulation analysiscrackfault analysis
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