To solve the problems of relay protection for short feeders and single phase to ground fault processing for neutral non-effectively grounded systems, two novel approaches based on coordination of primary equipments and secondary devices are put forward. A reactor is managed in series with the branch circuit breaker, with the help of which, the relay protection on branch switches are cooperated with the relay protection in the substation. The methodology of fault phase grounding is introduced to extinct the arc rapidly. Based on the variation of zero-sequence-voltage and zero-sequence-current before and after fault phase grounding, the grounding feeder is identified and the position of grounding is located. The sectionalizing switch adjacent with the fault may be also tripped to isolate the fault position. The principle of the innovations is described. The critical technologies are discussed in detail. Devices based on the proposed approaches are developed, the test results of which show their feasibility.