Research Of A New Type Main-Slave Peterson Coil

In electrical distribution systems, earth fault protection is one of the main functions to reduce outage times. The paper proposes the concept of Main-Slave adjustable coil based on the sum up of various earthing protection methods used in different countries, which adept the pri-adjust and following-set tuning method. The Main-Slave adjustable coil with power electronics is designed. The simulation and test show their prospect as the framework of earthing protection equipment. The paper gives a theoretical analysis of the relations between tuning coils and over voltages in resonant system. A scheme is proposed to solve this problem and its circuit model is built to give a verification. The Main-Slave adjustable coil is presented and compared for advantages and disadvantages, as well as for costs and benefits .To analyses the feasibility of these,　also a detailed analysis of the properties of present is given. The proposed system has a advantage of ensuring operational continuity since it does not trip on the first fault, no matter if there is arcing over voltage. And it provides a simple, reliable, selective means of protection. This paper is an attempt to give recommendation for improvement of the present solutions in compensated system.Li Wenfeng(Electric Power System and Automation)Directed by prof. Yang Yihan...