- Volume 65 Issue 6
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A Study on DC Offset Removal using Low-Pass Filter in AT Feeder System for Electric Railway
전기철도 AT급전계통에 Low-Pass Filter를 이용한 직류옵셋 제거에 관한 연구
- Received : 2016.02.09
- Accepted : 2016.04.06
- Published : 2016.06.01
The cause of failure in the AT feeding system is divided into grounding, short-circuit of feeding circuit and internal faults of the railway substation. Since the fault current is very high, real-time current is detected and the failure must be immediately removed. In this paper, a new DC offset elimination filter that can remove component to decrease in the form of exponential function using low-pass filter was proposed in order to extract the fundamental wave from distorted fault current. In order to confirm the performance of the proposed filter method, AT feeder system was modelled by simulation tool and simulations were performed under various conditions such as fault location, fault resistance and fault voltage phase angle in case of trolley-rail short-circuit fault. When applying the proposed DC-offset removal method, it can be seen that the phase delay and gain error did not appear.
AT feeder system;Fault current;DC offset;Low-pass Filter
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Grant : 철도 핵심부품 및 장치 기술개발 2단계(철도부품창의연구센터)
Supported by : 국토교통과학기술진흥원