Distributed small-current grounding fault location method

Abstract

The invention provides a distributed small-current grounding fault location method, and belongs to the electric power automation technology. The method is characterized in that the method comprises the following steps: a) a power distribution terminal carries out sampling and waveform recording on a zero-sequence current in a power distribution network; b) the power distribution terminal carries out detection on the zero-sequence current information, meanwhile, monitors broadcast messages sent by other power distribution terminals in the power distribution network and executes a zero-sequence current monitoring subprogram and a network broadcast monitoring subprogram; c) the power distribution terminal carries out zero-sequence current amplitude comparison; d) an adjacent detection power distribution terminal is determined; e) the adjacent detection power distribution terminal starts an adjacent detection flow; and f) fault sections or suspected fault sections are judged by utilizing the adjacent detection flow, and thus fault location is finished. The distributed small-current grounding fault location method does not need participation of a master station in the judging process of the fault sections, and is high in adaptation and higher in reliability.

Description

technical field [0001] A method for locating a distributed small current ground fault belongs to the power automation technology. Background technique [0002] In my country, the neutral point of the distribution network is widely used ungrounded or low-current grounding methods, and the most important fault form in the distribution network fault is single-phase grounding fault, accounting for more than 80% of the total faults, which seriously affects the normal life of users. . There are great difficulties in fault location technology, and it has always been a major problem in the power sector. After a long period of research, the low-current ground fault location has been improved, but there is still a lack of mature and practical fault location methods. At the same time, in the existing location methods, the participation of the master station is required, and the location process is cumbersome. Therefore, after a fault occurs in the distribution network, it is of great ...

AI Technical Summary

Problems solved by technology

There are great difficulties in fault location technology, which has always been a major problem plaguing the power sector

After a long period of research, the location of small current grounding faults has made some progress, but there is still a lack of mature and practical fault location methods. At the same time, in the existing location methods, the participation of the master station is required, and the location process is relatively cumbersome.

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