Technical specification of protection device for 1 000 kV UHV AC pilot project

To make sure the high reliability and advanced technology for relay protection of 1 000 kV UHV AC pilot project, the correlative technical specification should be studied. Based on the relative standards and specifications of general relay protection equipments, considering the functions of pilot project and the future UHV power system planning, the technical specification of Protection Device adapted to 1 000 kV UHV AC pilot project was set down. The adaptive scope, equipped principles, functions and technical guidelines for the relay protections of 1 000 kV UHV AC pilot project were presented, including line protection, over-voltage protection, transformer protection, reactor protection and breaker protection. The principles for main items were analyzed on the base of dynamic simulation tests.