부산대학교 도서관

A new advanced protection algorithm based on a correlation technique to protect a busbar station consist of two voltage levels (220kV and 66 kV) will be presented in this paper. The proposed technique is developed for Busbar protection against all faults types, which may occurs in busbar zone. The technique uses the existing current transformers of all feeders in the station to measure the current signals and not need any extra equipment’s, while the technique depends only on the existing currents transformers at all feeders which connected to the protected zone. The proposed methodology is applied for a part of 220 KV Egyptian network. There are two program packages are used to implement the proposed technique (ATP) and MATLAB program. Large numbers of operation and fault cases are simulated to fulfill the requirements of busbar protection high speed and sensitivity for internal faults, and stability during normal and external faults with and without CT saturation effect. They further demonstrated the noticeable adaptability and performance of the algorithm since it is not affected by such fault parameters as fault type, fault resistance, and fault inception time.