A Supporting System for Decoupling Decision of Beijing 220kV/550kV Electromagnetic Loop Network

摘要

With the development of Beijing power grid 500kV/220kV electromagnetic loop network is formed. The operation of electromagnetic loop network results in the situation that the short-circuit current of some 220kV buses approaches or even exceeds the rated value of the circuit breakers. The efficient measure to reduce the short circuit current is to break down the electromagnetic loop. The difficulty to do so is how to determine the optimum decoupling scheme. Aiming at settling this problem, a supporting system and the judgment indexes for the decoupling decision of the electromagnetic loop is designed in this paper, and a comprehensive judgment method based on AHP is proposed. Applying the supporting system to the decoupling decision for Beijing 500kV/220kV electromagnetic loop network shows that the supporting system as well as the indexes proposed in this paper is efficacious.