Mechanism Analysis and Simulation Study of Closing Overvoltage Fault in EMU Circuit Breaker
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 6
Abstract
Objective The overvoltage caused by circuit breaker closing will aggravate the insulation aging of high voltage equipment when EMU (electric multiple units)passes neutral section. The research on the mechanism and influencing factors of overvoltage caused by circuit breaker closing provides significant theory for the insulation matching and equipment selection of EMU main circuit. Method Based on the EMU main circuit structure and the process of passing neutral section, the causes of overvoltage during breaker closing under normal operation is analyzed. In consideration of the special influence of vacuum circuit breaker closing bounce characteristics on overvoltage, a simulation model of EMU main circuit is established.By comparative study of the overvoltage characteristics of EMU main circuit breaker closing, the influence patterns of main circuit action time, parameters of EMU high voltage cable, parameters of catenary and equipment characteristics on overvoltage are obtained. Result & Conclusion In extreme conditions, the peak overvoltage is 2.39 times the peak power frequency voltage, close to 2.4 times the stipulated value in the "Testing specifications of high-speed electic multiple unit on completion of construction". The overvoltage generated in extreme conditions will affect the insulation performance of the EMU high voltage equipment, even leading to breakdown phenomenon. Therefore, it is necessary to adopt the phase controlling closing technology for the circuit breaker to close at the target phase, select the high voltage cable with small capacitance of unit distribution, improve the mechanical characteristics of the vacuum circuit breaker and other relevant preventive measures，and finally to effectively reduce the EMU closing overvoltage.
Authors and Affiliations
Mingrui ZHANG, Ningchuan ZHANG, Zhengwei LIU
Keywords
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- EP ID EP737745
- DOI 10.16037/j.1007-869x.2024.06.016
- Views 73
- Downloads 0
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