System for identifying and positioning broken line fault of high-voltage line based on low-voltage power distribution

Abstract

The invention is suitable for the technical field of power distribution network automation in a power system, and provides a system for identifying and positioning a high-voltage line disconnection fault based on low-voltage power distribution, which comprises a single-phase disconnection monitoring module, a fault phase judgment module, a fault point position confirmation module and a fault point positioning module; the system is installed on a low-voltage line of a power distribution network to monitor a high-voltage line fault, and the system can judge a line breakage fault and a breakage phase; the system is connected with a background management server through a wide-area Internet of Things network, and the background receives fault information of all monitoring devices and performs comprehensive analysis to realize fault positioning. The background server immediately sends information such as fault types, fault time, fault phases, fault lines, fault section positions and fault point positions to a mobile terminal of a distribution network operation management and maintenance responsible person through the Internet of Things.

Description

Technical field [0001] The present invention belongs to the field of power distribution network automation technology, which specifically belongs to the online monitoring of distribution lines and the technology of disconnection fault identification and positioning, to promote the processing of line maintenance and maintenance, timely processing faults, and restore power supply security power supply in time. Background technique [0002] China's land is vast and has basically realized electrification, but the number of electricity system lines in urban and rural areas have a large number of power systems. In particular, the distribution network will inevitably cover all buildings, causing the line branch and cross-complex, and the probability of failure increases; Especially when the disconnection fault is broken, it will make the two phases cannot be operated. It has a lot of affected, which has a lot of losses; for the vast rural and urban suburbs, their distribution lines are ...

AI Technical Summary

Problems solved by technology

[0004] The premise of the application of this technology is that the three-phase load current is required to be symmetrical when the line is working normally, so that when an abnormality occurs, it can be displayed as a significant zero-sequence current; the actual problem here is that the load current of the three-phase line on the distribution main line is different most of the time , The current of each segment line in each phase line is also different, and the three-phase current of each segment line is more difficult to balance at different instants, so that the zero-sequence current synthesized at the fault instant is mainly caused by these imbalances, which may not be true Caused by a fault; or the zero-sequence current is not able to accurately reflect the fault, because the conventional zero-sequence current contains components that are originally unbalanced, so it is uncertain for the accuracy of fault identification and location

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