A new time domain-based busbar protection algorithm

摘要

This paper presents a new time domain busbar protection algorithm which uses current samples and their halfcycle incremental quantities to implement a fast and reliable tripping logic. The sign of incremental quantities is used to determine the fault direction and to distinguish internal from external busbar faults. Also, a differential incremental current is calculated for properly selecting the circuit breakers that must be opened to clear the fault. In order to test the proposed technique, a double-bus single-breaker busbar configuration was modeled in ATP/ ATPDraw software and several types of internal, external and evolving faults are simulated. The results reveal the proposed function quickly operates for internal faults and ensures security for external faults. Moreover, the proposed approach allows a fast detection of internal faults during an external fault. Hence, although the proposed function is based on well-known fundamentals, it achieves the principal requirements for a busbar protection scheme with a high degree of adaptability and reliability for severe cases.