Research on 220kV Substation Main Electrical Connection Optimization Based on Life Cycle Cost Theory

As a key link of power transmission, substation main wiring plays an important role in improving the reliability of power supply in the grid. At present, the design of substation main wiring mainly is made with reference to the typical design schemes. However, due to the continuous development of load and the reliability requirements, the traditional wiring scheme may not fully meet the actual operation requirements. In response to this problem, a new main wiring idea is proposed, 3/2 circuit breaker wiring is added to the conventional double bus wiring scheme to form a mixed wiring scheme. The reliability of each scheme is calculated and analyzed. A certain 220kV substation with heavy load in Chengdu is taken as an example, the loss of social output value is considered, the comprehensive economy of the whole life cycle of the substation construction is calculated and compared, and finally the conclusion is drawn that the reliability and economy of the proposed scheme are the best.