FAULT LOCATING PROTECTION APPARATUS AND METHOD BASED ON POWER DISTRIBUTION NETWORK INTELLIGENT TERMINAL

摘要

Disclosed are a fault locating protection apparatus and method based on a power distribution network intelligent terminal. The method comprises: dividing a power distribution network into at least one minimum power distribution area, calculating the fault state differential value Ssum of each area, comparing the fault state differential value Ssum of each area with a state set value of this area, determining a differential protection action through short-time delay if the comparison difference of the area satisfies a set condition, and after the differential protection action, tripping off all distribution switches in the area to realize fault isolation. By adopting the fault state differential principle for power distribution areas, the fault locating protection method based on the power distribution network intelligent terminal can control the time for the fault isolation of power distribution networks within 100ms, thereby solving the problems of shortened service life of switches and an impact upon users due to the fact that the switches are opened and closed many times in traditional power distribution network fault isolation and also avoiding an influence caused by the access of a distributed power supply.