Development of leakage current monitoring device for arrester

In order to determine the deterioration of an arrester used in bullet train electricity feeding, it is effective to capture changes in the current of the resistance in the leakage current that flows through the grounding cable of the arrester. However, it is difficult to measure current of the resistance directly. In this research, we devised a principle for the detection of changes in current of the resistance by obtaining a leakage current that can be measured using the grounding cable of an arrester at an arbitrary date and time, and by calculating the difference with a reference leakage current. We have also developed a leakage current monitoring device for arrester by applying this principle to measure the current of the resistance at a bullet train substation.