Introduction The paper aims at the shortage of traditional in-situ fault-handling voltage-time mode or new technology intelligent distribution in the existing distribution automation technology, an intelligent distributed voltage-time dual strategy local fault segment discrimination method is proposed. The characteristics of automatic fault handling of in-situ feeders are analyzed. Method Intelligent distributed was adopted as the main protection of the system. In the case of the failure of the intelligent distributed primary protection, the system lost power to the voltage-time backup protection through the substation delay trip, step-by-step closing for fault location, isolation and fast recovery of non-faulty sections. The entire process of fast recovery of the fault zone.
Result The test results show that the time of intelligent distributed completion protection is less than the maximum cut-off time ΔT1 (150 ms), and the over-current delay time fixed value ΔT2 in the voltage-time backup protection mode is between 200~300 ms.
Conclusion The method can guarantee the reliability of power supply for the rapid processing of faults, and can be promoted in the application of actual distribution network.
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