Research on Differential Bus Dead Zone Protection of 4 Busbar Based on the New Six-Unification Standard

Abstract

With the formation of UHV AC-DC hybrid power grid, the adaptability of conventional substation protection to the change of power grid characteristics needs to be improved. This paper detailedly demonstrates the double bus and double section TA dead zone fault bus protection cut-off time is too long that affects the safe and stable operation of the power grid, mainly explains the 220kV section and bus link dead zone protection action mode and dead zone protection action time limit based on the new six-unification relay protection provisions. It has strong practicability and high typicality