Substation protection method for missing measurement information of transformer and bus connecting line

In order to solve the problems of protection misoperation and refusing operate caused by lack measurement information in smart substation, a substation method which can effectively eliminate influence transformer inrush current bus CT saturation when connecting line is missing proposed. Through theoretical analysis synthesis based on Kirchhoff law, it proved that will lead misjudgment differential protection. Accordingly new station proposed deal with information. verify correctness method, taking typical 220kV model as an example, PSCAD / EMTDC electromagnetic transient simulation software used simulate different conditions types faults. The results show accurately interference saturation, ensure correct action protection, improve stability missing.