Design Of Distribution Network Digital Protection Device And Substation Integrated Automation

Substation integrated automation technology is developing direction of power system. Whole digital protection device is very important part for distribution network substation and research of digital protection device is a very important topic. This paper analyzed the transformer protection method and the distinguishing method of inrush current. The protection tripping sensitivity and speed was improved. To 35kV circuit breaker, lack phase protection method was presented and the protection function was perfected. In feeder line protection, inverse time protection performance was studied. The hardware and software of digital protection device was designed. The protection device was applied in substation automation system, and the application effect was very well.