Capacitance And Other Equipment Fault Caused By High-speed Trains Analysis And Management Strategy Of DaCheng Electrified Railway

With the rapid development of high-speed railway, the high harmonics produced by "AC-DC-AC" electric locomotive damages increasingly prominent OCS(over contant system). Caused by equipment failure is everywhere.That is serious harmful to the railway high-speed, safe and economical operation. This article aims to find a reliable, simple and economical equipment failure management program.This article first, Occurred on the actual operation of the characteristics of various faults, Combined with existing high-speed railway on the occurrence of harmonic resonance to compare failure, it was found there are many similarities between the two. Thus speculated that equipment failure is caused by the high harmonic resonance, then, the capacitor through the analysis of the causes of damage, that damage to the capacitor is mainly caused by the overheating of the harmonic current breakdown of the aging. At the same time, through the analysising that current and voltage amplification principle and line impedance frequency characteristics. Harmonic resonance current role in the power system and the traction power supply system harmonic impedance after synthesis, resulting in bus rapid increase in the harmonic voltage components,synthesized with the fundamental voltage causes the voltage increases, the magnitude of increase in incentives from the EMU decide the harmonic resonance. As the frequency increases, there is the first parallel resonance, series resonance and parallel resonance, after alternating. Resonance only hanppened in the the condition that the traction system parameters to achieve a resonant frequency. Parallel resonant frequency is fixed, by the traction parameters of the structure and components determined, not random car locations vary. Resonant frequency is a random vehicle position change. Then again, by actual test and simulation analysis, confirmed that traction must be accompanied by resonant amplification of harmonic current and the load farther away from the substation, the greater the magnification. Harmonic current is amplified, the role of traction transformer in the power system harmonic impedance after synthesis, resulting in dozens of kV resonant harmonic voltage, causing the bus voltage RMS was significantly increased, leading to equipment failure. Finally, several sets of governance programs, and its control effect on the simulation platform for authentication, while the economic investment in the equipment to do the estimate for the final reference for the governance of equipment failure.