Abstract
By the field investigation of the metro system, it is found that there is relatively serious corrosion in the terminal of the metro line, and overvoltage protection device (OVPD) often operates when the metro system is in the valley level. In order to analyze the causes of these conditions and alleviate the related problems caused by high rail potential. In this paper, establish a simulation model of metro system by CDEGS software, and consider the influence of the track-to-track cross bond on rail potential. It is analyzed that the causes of high rail potential in the terminal of the metro line and high rail potential operating small number of trains in the metro line. And it is analyzed that the influence on the rail potential of metro line, the influence on OVPD outside the power supply section, the influence on the station grounding gird where the OVPD is, caused by OVPD operation. The results show that the rail potential can be reduced to some extent by setting the track-to-track cross bond. No traction power substation (TPS) in the terminal of the metro line increases the rail potential. When the braking train supplies power to the accelerating train outside the power supply section in the metro line, the rail potential of some part of the line increases. The OVPD operation increases the ground potential around the station grounding gird, and may lead to the continuous operation of other OVPD in the metro line.
Highlights
In metro system, the rail undertakes train operation, and acts as the carrier of current from the train to the rail
When the overvoltage protection device (OVPD) operation is caused by high rail potential, it may lead to problems such as abnormal grounding of station equipment and increase of stray current caused by continuous OVPD operation
When there are two accelerating trains in the power supply section from YP station to IECC station, and the trains are located at 6400m of the downtrack and 6300m of the uptrack respectively, the rail potential of GP Station is higher than the OVPD operation threshold, and the OVPD operation of GP has an impact on the rail potential in the whole metro line
Summary
The rail undertakes train operation, and acts as the carrier of current from the train to the rail. The increase of rail potential and OVPD operation both increase the level of stray current in metro system, and it may cause more serious stray current problem. It is necessary to study the causes of high rail potential and consider the influence of OVPD operation in metro system. The researches on rail potential mainly analyzes the structural parameters of metro system by building the simulation model or calculation model [14]. The stray current and rail potential of the metro depot have been simulated by building simulation model [26]. When the OVPD operation is caused by high rail potential, it may lead to problems such as abnormal grounding of station equipment and increase of stray current caused by continuous OVPD operation
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