Distribution Network Fault Detection and Isolation Control System

Abstract

The invention discloses an isolation control system of grid power distribution fault detection. The isolation control system of the grid power distribution fault detection comprises a switch, a voltage detection module, a zero sequence voltage collection module, a fault current collection module and a controller. The zero sequence voltage collection module arranged inside every grid power distribution section detects the zero sequence voltage inside the section; the condition of single-phase grounding in the section can be shown when a zero sequence voltage exceeding a limit value exists, and the controller can switch off the switch of the section according to the zero sequence voltage data accurately, accordingly the isolation of the section with the single-phase grounding can be achieved; further, according to the isolation method of the grid power distribution fault detection, a fault current is introduced as a criterion, when the fault current is not detected in a grid power distribution section, the section can be determined as a section without faults, so that a substation does not need switch-on delay determination during reswitching on the switch but directly switches on or off the switch, further power-out time duration in non-fault sections can be shortened.

Description

technical field [0001] The invention relates to distribution network technology, in particular to feeder automation fault isolation technology. Background technique [0002] Existing distribution network fault detection methods generally use voltage as the fault criterion. When a certain phase of the three-phase voltage is abnormal, it is judged that the distribution network is faulty. At this time, the substation trips. After the substation is reclosed, the terminals are closed step by step after a delay. When the substation trips again, the distribution network section can be judged. for the faulty section. The above scheme cannot achieve fault isolation for the section with a single-phase ground fault; for the section without a fault, the secondary reclosing of the substation needs to be closed with a delay to increase the power outage time of the non-faulty section. Therefore, the prior art has the problems of protecting the blind zone and increasing the power failure ...

AI Technical Summary

Problems solved by technology

The above scheme cannot achieve fault isolation for the section where a single-phase ground fault occurs; for the section where no fault occurs, the secondary reclosing of the substation needs to be closed with a delay to increase the power outage time of the non-faulty section

Therefore, the existing technology has the problems of protecting the blind zone and increasing the power failure time of the non-fault zone

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