Research on distributed wide-area back-up protection system for high-voltage transmission system

At present, the high-voltage back-up protection system is facing the problems of setting difficulty and the complexity of protection coordination causing too long delay. As for the primary system device-dependent configuration principle, it aggravates the complicacy of the secondary circuit which does not have the interchangeability and interoperability, reducing the reliability of the relay protection system. As a result, this article proposes a high-voltage wide-area distributed back-up protection system using circuit breaker IED configuration principle so as to provide comprehensive back-up protection for the circuit breaker-associated primary system. In the article, a protection zoning method based on three typical system structures is demonstrated which is able to simplify IED protection logic and redistrict the protection domain into efficient fault isolation procedures in the substructures. The principle is analyzed under the typical IEEE5 nodes model, and the reliable conclusion is obtained.