Research on High-Speed Self-healing Technology of Active Distribution Network Based on Eddy Current Repulsive Switch

The traditional ladder-type time-limited current protection for feeders generally has the problems of slow fault isolation speed, low accuracy and poor reliability. Depending on the protection of the communication channel, the fault can be isolated and recovered accurately, but its reliability and rapidity are limited by the communication channel, and the construction and maintenance cost of the channel is high. Channel-free protection, which does not depend on communication channel, has better protection characteristics, but it is difficult to give full play to its advantages when symmetry fault occurs. Especially with the access of wind power, photovoltaic and energy storage, the distribution network structure has become increasingly complex, which has changed from single power supply network to multi-power supply network, making the existing protection schemes more difficult to meet the actual needs. In view of this situation, this paper proposes a new high-speed self-healing automatic protection scheme for distribution network. This protection scheme does not need communication channel and channel equipment to transmit fault information to each protection unit, and has the characteristics of high reliability, accurate fault isolation and fast fault isolation.