Authors:
An Zhang
1
;
Qingpeng Feng
1
;
Jianqiong Zhang
2
;
Zhongkang Yuan
2
and
Qingfeng Wang
2
Affiliations:
1
CRRC Qingdao Sifang Co., Ltd, Qingdao 266000, China, China
;
2
Southwest Jiaotong University Chengdu 610031, China, China
Keyword(s):
Three-dimensional body model; overvoltage of bullet car body; operating main circuit breaker; EMU.
Abstract:
At present, China's high-speed railway is in the process of rapid development, followed by the safety of emu has attracted increasing attention. In the course of emu running, the main circuit breaker will be frequently operated in the process of excessive phase, lifting bow and so on, thus causing transient overvoltage. However, the shielding layer of the high-voltage cable is connected to the vehicle body, which will make the over-voltage coupling to the vehicle body, forming the over-voltage of the vehicle body and endangering the driving safety. In this paper, based on the three-dimensional vehicle body model and based on the analysis of the overvoltage generation principle of the vehicle body, the electromagnetic interference coupling path is obtained. Considering the actual working conditions of the standard emu, the interference signal caused by the disconnection of VCB is taken as the interference source to analyze the over-voltage distribution of the vehicle body caused by th
e disconnection of VCB. The actual three-dimensional model of the vehicle body and the high-voltage cable is built and embedded into the circuit module, which breaks the traditional equivalent method of equating the vehicle body with the four-side impedance, and the over-voltage characteristics of the vehicle body at a specific position can be obtained. The simulation results show that the generated overvoltage is about 2.9kv, the oscillation time is about 25us, and the frequency spectrum is mainly 1.62MHz, which conforms to the basic characteristics of overvoltage.
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