Applicable grid structure of 220 kV main connection mode of two section single bus with tow circuit breaker
GAO Mei jin1, YU Peng2, ZHU Yan han1, HUANG Min xiang2
(1.State Grid Zhejiang Electric Power Corporation Economic and Technology Research Institute, Hangzhou 310008, China;
2.state arid Jiangsu Electric Power Corporation Economic and Technology Research Institute, Nanjing 210008, China)



Abstract: Aiming at the new wiring form of 220 kV main connection mode of two section single bus with tow circuit breaker, the applicable grid structure was studied in terms of reliability, combined with the actual situation of zhejiang power grid. Three typical grid structures were proposed and the reliability evaluation model based on RAMSES was established with appropriate reliability evaluation index. The basic reliability data of AIS and GIS equipment were selected as the basic input data of the model respectively. Compared with the double bus connection method, the analytic probabilistic analysis method was used to simulate the failure of the grid and analyze the consequence of the failure, and to calculate the failure probability, failure frequency, EPNS and EENS of different typical grid structures with different wiring. The basic reliability data of multiple GIS equipment were preset to validate the influence of different basic GIS equipment reliability settings on the calculation results. The reliability evaluation of two different construction timings of three main transformers was given, and the construction timing suggestions were given in terms of reliability. The results indicate that the proposed wiring is applicable to the typical singlering network and doublering network structure proposed in the view of reliability.

Key words: single bus with tow circuit breaker in system; grid structure; the reliability