Quantitative analysis on coupling of traction current into cab signaling in electrified railways
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Quantitative analysis on coupling of traction current into cab signaling in electrified railways Chang Liu1 • Shiwu Yang1
•
Yong Cui1 • Jiaqi Lv2
Received: 6 July 2020 / Revised: 20 August 2020 / Accepted: 25 August 2020 / Published online: 19 September 2020 The Author(s) 2020
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 ZPW2000 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.
& Shiwu Yang [email protected] Chang Liu [email protected] 1
School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China
2
Research and Development Center, CRSC Urban Rail Transit Technology Co., Ltd, Beijing 100166, China
Keywords Cab signaling Electromagnetic field Track circuit Immunity test Traction current interference
1 Introduction The cab signaling apparatus, also 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. The information is then demodulated, decoded, and transmitted to the vital computer for processing, to achieve train control, or to provide visualized control information through the driver machine interface (DMI). Therefore, it is designed to meet the high-safety and highreliability requirements of onboard equipment under highspeed rail conditions and plays an essential role in the vehicle-to-ground wireless communication. With the development of high-speed and heavy-haul railways, the traction power has increased remarkably, and the types of el
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