Abstract:In the new generation intelligent substations, to protection the LV busbar, shared information provided by advanced internet communication technology was fully applied, incorporate with merging unit and intelligent unit, ring grid distributed arc protection for intelligent substation were indicated. Slaves interconnected by dual redundant ring grid and share data with each other. Based on highly reliable communication, logical judgement will not be done by salves. Pointband universal type sensor and its selfinspection technology will benefit the system extension and maintenance. High speed tripping technology will increase the overall performance of intelligent substation.

Keywords:intelligent substation, ring grid distributed type, distributed arc protection, self checking technology, high speed tripping