Modeling and Experimental Analysis of Overvoltage and Inrush Current Characteristics of the Electric Rail Traction Power Supply System

High-speed EMUs (electric multiple-units) frequently pass through the phase-separation zone during operation. Overvoltage generated operation of vehicle-mounted circuit breaker has a long duration and high waveform steepness, which accelerates service life equipment is likely to cause insulation failures. For above-mentioned problems, operating overvoltage characteristics high-speed EMU were obtained by traction substation-catenary-EMUs system (SCES) analysis experiments, thus deriving influences closed phase angle residual magnetism transformer on overvoltage. The results showed that voltage catenary significantly affected overvoltage, switching was small at 0–40°, 140–210° 320–350°. primary side 60.78 kV, with transient impact high-frequency oscillation 22.71 an initial period 0.01 ms. Then, became longer, it took 0.5 ms for from attenuation disappearance. Finally, scheme series reactance suppression devices proposed protect transformers. This work provide data support design protection power supply system.