Research on Train Shunting Impedance Based on Transmission Line Theory

TL;DR

This paper develops a transmission line theory-based model to analyze train shunting impedance, considering multiple wheel sets and complex track circuit conditions, enhancing understanding of fault scenarios like 'poor shunting.'

Contribution

It introduces a comprehensive six-terminal network model for train shunting impedance that accounts for multiple wheel sets and track parameters, advancing beyond simplified models.

Findings

The model accurately reflects the influence of wheel set resistance and track components.

Verification confirms the model's correctness using track circuit reader principles.

Simplified impedance model aids in fault diagnosis and system optimization.

Abstract

At present, the shunting process of train to track circuit is usually studied by taking the shunting resistance of the first wheel set of train as the equivalent model, which ignores the shunting effect of other wheel sets and cannot study the fault conditions such as "pool shunting". Especially for the jointless track circuit (JTC), the compensation capacitors connected in parallel on the rail line will cause more complex train shunting process. To solve this problem, based on the transmission line theory, starting from the shunting resistance of each wheel set and considering the leakage of track bet, this paper established as six-terminal network model of train shunting impedance, indirectly verified the correctness of the model by using the working principle of track circuit reader (TCR), and focused on the influence of wheel set shunting resistance, compensation capacitors and rail line parameters on train shunting impedance. Finally, based on the calculation of the structural importance of train wheel set, a simplified model of train shunting impedance was constructed, providing theoretical support for the further study of fault conditions such as "poor shunting".