Two Step Method For Rail Potential Rise Analysis
In A DC Traction Power Supply System
Author(s)
S. Chung, H. Kim & H. Jeong
Abstract
An algorithm for analyzing the rail potentials in a DC traction power supply
system is proposed. The distinctive feature of this algorithm is that it uses the
node voltage method twice in the rail potential analysis. To calculate the rail
potentials, the leakage resistance of the running rail must be included in the
equivalent network which makes it difficult to apply the node voltage method.
The mesh current method has the drawback that the initial mesh currents are
difficult to estimate, which is necessary for an iterative network solution. In this
algorithm, the rail potentials are obtained by applying the node voltage method
twice. In the first stage, the injection currents to the negative rail are obtained
from a load-flow study. In the next stage, a network consisting of the negative
rail and the injection currents is constructed. The leakage resistance to ground is
added to the network a, and the rail potentials of the network are analyzed. A
computer load flow analysis software package was developed to verify the
validity of the algorithm. The results from the software are compared with the
EMTP-RV circuit analysis results, and the results are nearly identical.
Keywords: rail potential, simulation, DC traction power.
1 Introduction
In most DC powered electric railways, running rails are also used as the negative
return path to the rectifier negative bus in the substation. In this system, the
potentials of the running rails rise with increasing load current. The increased rail
potential causes concern for human safety, due to the possibly hazardous
excessive touch voltage and step voltages [1]. For this reason, the maximum
allowable rail potential is limited by IEC standard 62128 [3]. The rail potential
Keywords
rail potential, simulation, DC traction power
Related Book
Other papers in this volume
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