The Negative-Sequence Distance Protection for UHV Long Distance Transmission Line

UHV transmission can transmit huge capacity energy over long distance. The paper proposes a new negative-sequence distance protection based on Bergeron model. Since Bergeron model has taken distribution parameters into account, the proposed principle is valid for providing protection in the case of remote or close faults, and it has high sensitivity for fault with fault-path resistance. Furthermore, this protection will not be influenced by load current, system oscillation, etc. The superior performance of the protection shows that it is especially competent to be the backup protection of UHV long distance transmission lines.