A new method for busbar protection stability improvement

As busbar is one of the most important power system nodes, the busbar protection is an essential component in network design, considering the power system stability and security. So busbar protection should fulfill the requirements of fast operating times for all kinds of busbar faults, security for external faults with heavy current-transformer (CT) saturation, and minimum delay for evolving faults. In order to meet the requirements above, a new method, called current phase comparison, is presented in this paper, which can achieve reliable busbar protection with minimum CT performance requirements. Thousands of RTDS test and MATLAB analyses have been performed, which proved that the stability of busbar protection can be greatly improved by this new algorithm.