Abstract
Cab signaling apparatus is the critical equipment for ground-vehicle communication in electrified railways. With the rapid development of high-speed and heavy-haul railways, the immunity to unbalanced traction current interference for cab signaling apparatus in the onboard train control system is increasingly demanded. This paper analyzes the interference coupling mechanism of the ZPW-2000 track circuit. Based on electromagnetic field theory and the actual working parameters, a calculation model is established to complete the quantitative research of the cab signal induction process and traction current interference. Then, a finite element model is built to simulate the process. The simulation results under the signal frequency, fundamental and harmonic interference are all consistent with the theoretical calculation results. The practical measurement data verify the coupling relationship between cab signal inductive voltage and rail current. Finally, an indirect immunity test method applying this relation for the cab signals is proposed, and the voltage indexes of the disturbance sources are determined, i.e., the test limits. The results provide an accurate quantitative basis for the cab signaling research and design of the immunity test platform; besides, the proposed indirect test method can simplify the test configuration and improve test efficiency.
Highlights
The cab signaling apparatus, known as the specific transmission module (STM) or the track circuit reader (TCR), is a kind of crucial information receiving equipment in the Chinese train control system (CTCS) or European train control system (ETCS) onboard subsystem
Based on electromagnetic field theory and the actual working parameters, a calculation model is established to complete the quantitative research of the cab signal induction process and traction current interference
The results provide an accurate quantitative basis for the cab signaling research and design of the immunity test platform; besides, the proposed indirect test method can simplify the test configuration and improve test efficiency
Summary
The cab signaling apparatus, known as the specific transmission module (STM) or the track circuit reader (TCR), is a kind of crucial information receiving equipment in the Chinese train control system (CTCS) or European train control system (ETCS) onboard subsystem It cooperates with the ground track circuit to complete the transmission of the train control information from the ground to the train through the electromagnetic induction process. Concerning the actual cab signaling immunity test and research & development process, there are still a few intensive problems such as insufficient signal current data, the incomplete corresponding relationship between interference current and inductive voltage, and defective test configuration regulations. The focus is based on the electromagnetic theory to complete the qualitative analysis of the traction current interference coupling mechanism and the quantitative calculation of host input voltage, which is preliminarily proven using the finite element simulation model. The method can simplify the test circuit, improve the test efficiency, and effectively avoid the test error caused by coupling other electromagnetic field energy in the current transmission path, thereby ensuring the test accuracy
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