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전동차 자동열차정지장치와 지상신호설비 간의 전자파 간섭
최규형(Kyuhyoung Choi),윤선호(Sunho Yoon),고영환(Youngwhan Kho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The ATS(Automatic Train Stop) system have only a train stop function at the time of emergency, and Seoul Metro is planning to replaced them with ATC(Automatic Train Control)/ATO(Automatic Train Operation) system which can provide dedicated train speed control for headway reduction and unmanned operation of train. Until all the ATS system is replaced with the new ATC system, both systems are to operate simultaneously at the same metro line. In this situation, ATS system sometimes reveals improper operation: train stops suddenly without any obstacles in front of it. These improper stop cause interruption of passenger service. The authors make it clear that these interruptions are caused by EMI phenomena between ATS on-board device and track circuit of ATC system: Signal current flowing in the track circuit is turn out to be a EMI source that prevent the ATS on-board device from normal operation. This is investigated by frequency spectrum analysis of signaling currents and frequency response of ATS on-board device analyzed by FFT(Fast Fourier Transform). The analysis shows that ATS on-board device has a frequency response covering the frequency of signaling current flowing in the track circuit. Although the two systems have different frequency range. The countermeasures to prevent these EMI phenomena are suggested in two ways. One is elimination of EMI source: blocking the signaling current of track circuit when ATS-mounted train pass. Dedicated device for automatic blocking of signaling current is developed and installed at the site. The other is enforcement of EMS(Electromagnetic Susceptibility) : setting a high-pass filter to the circuit of ATS on-board device. These measures make a success in preventing the EMI problem of Seoul Metro line 2.
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