Distributed generation changes the operation mode of distribution network and makes newchallenge and demand for operation and management of distribution network. Under this situation

applying the syncretic design idea of primary and secondary power equipment

puts forward a new typeof intelligent switch adapting for distributed generation management. The application result shows thatthe intelligent switch of adopting electronic transformer to collect all of the operation data has thefunctions of three-section over current directional protection

zero sequence directional protection andelectric energy measuring

etc.

it can solve the problems of distributed generation management

judgeand separate the fault of multiple transmission power lines.