Small-current failure location system

Abstract

The invention discloses a small-current failure location system which comprises a main station, a peer-to-peer communication network and distribution automatic terminal FTUs (Feed Terminal Unit), wherein the FTUs access the peer-to-peer communication network; the main station access a peer-to-peer network through a communication processor; the peer-to-peer communication network is used for realizing peer-to-peer communication between adjacent FTUs; each FTU comprises a failure receiving unit used for receiving failure information reported by the FTU, an incoming line failure judging unit used for judging whether an incoming line of a looped network cabinet corresponding to the FTU fails, a unit for judging failure between adjacent looped network cabinets, and a unit for determining failure of a bus between the looped network cabinets, wherein the unit for judging the failure between the adjacent looped network cabinets is used for delaying time Ti, receiving failure information of adjacent FTUs through the peer-to-peer network and judging whether looped network cabinets corresponding to the adjacent FTUs fail when the incoming line failure judging unit judges that two incoming lines fail; and the unit for determining the failure of the bus between the looped network cabinets is used for determining that the type of the failure is the failure of the bus between the looped network cabinet when the unit for judging the failure between the adjacent looped network cabinets judges that the looped network cabinets corresponding to the adjacent FTUs do not fail.

Description

technical field [0001] The invention relates to the technical field of power system automation, in particular to a small current fault location system. Background technique [0002] At present, in order to reduce the fault time of the medium-voltage power grid, the feeder automation (FA) has been widely paid attention to. FA refers to the automation of feeder lines between substation outlets and user equipment. It is used for user detection, data measurement, and operation optimization under normal conditions, as well as fault detection, fault isolation, transfer, and restoration of power supply control under accident states. [0003] The conventional FA implementation mode is the centralized control type, which requires a communication channel and a control master station. When a fault occurs, the master station receives the information sent by the feeder terminal unit (Feeder Terminal Unit, FTU), and locates the fault through software calculation based on the information ...

AI Technical Summary

Problems solved by technology

[0003] The conventional FA implementation mode is the centralized control type, which requires a communication channel and a control master station. When a fault occurs, the master station receives the information sent by the feeder terminal unit (Feeder Terminal Unit, FTU), and locates the fault through software calculation based on the information , and automatically send remote control commands to the switch to achieve the purpose of isolating faults and restoring power supply. However, in this control mode, receiving fault information, locating faults and issuing control commands are all operated by the master station, so , the burden on the master station is heavy, and the speed of troubleshooting is slowed down. At the same time, the FTU uploads information to the master station, and the master station sends control information to the FTU. The information needs to be transmitted back and forth between the master station and the FTU, which leads to The time for fault processing is extended, and fault processing will cause short-term power outages in healthy sections. Due to the prolongation of fault processing time, the power supply recovery time is at the level of minutes. However, for some places that are very sensitive to power supply quality, such as semiconductor integration For circuit manufacturing plants and stadiums with important events, even a minute-level short power outage will cause serious economic losses and confusion

In addition, because in the centralized control mode, the switch or the FTU of the ring network cabinet must communicate with the control master station, and the fault isolation is centrally controlled by the master station by remote control. Therefore, this method requires relatively high reliability of communication. Once the system communicates Failure of the mode will directly lead to the loss of the function of the feeder automation

Images