추진제어장치 동작 중 궤도 점유 회로 오류 방지 대책

It often happens that the position indication of EMU(Electric Multiple Unit) is not possible from a malfunction of specified components by a factor of flow such as harmonic current at a track occupied circuit. Especially, a common frequency factor can be included at the return current generated during operation of propulsion system because DC input voltage is inputted from rectifier via transformer and it is easy to have a malfunction of a component (relay) has a factor of the common frequency as an operating source. Here, current detected through using and extra current transformer and sensing circuit to measure the return current when operating can be extracted into the current of common frequency by "Algorithm for extracting the factor of specified frequency" on the propulsion system of DC line voltage applied to EMU. It has the purpose that is to minimize a malfunction of the relay in track occupied circuit as applying real time monitoring and protection logic by setting a criterion level.