On-line monitoring system for capacitive traction power equipment of high-speed railway

This paper proposes a set of on-line monitoring system for capacitive traction power equipments applied in high-speed railway, such as high-voltage bushing, current transformer, potential transformer, and zinc oxide arrester. The electric circuit for the on-line system including zero-flux type current sensor and data acquisition unit is described in detail. The accuracy is enhanced by applying the twin-stage zero-flux type current sensor; and the efficiency is raised by applying simultaneous techniques. This system has been running in several high-speed railways in China.