A distribution network fault early warning method and system

Abstract

The invention discloses a method and system for pre-warning a power distribution network fault. The system comprises a monitor server, a communication network, and a monitor terminal; and the monitor terminal comprises a network voltage detection circuit, a network current detection circuit, a video acquisition device, a positioning device, a meteorological data acquisition device and a monitor terminal processer. The monitor terminal is used for acquiring data of distribution lines, transformers, switch breakers, isolating switches, capacitors and reactors and obtaining a node-branch association list, a bus node association list, nodes and a branch association matrix; reading the status of the distribution line switch and branch status information; calculating active load power and reactive load power of each node, and updating the obtained information to a master monitor station through a communication network; the monitor server is used for receiving data information sent by a remote monitor terminal through the communication network, displaying and saving the data information of the distribution network in real time, and sending a fault alarm when the distribution network data information exceeds a preset threshold value and isolating fault sections.

Description

technical field [0001] The invention relates to the field of power distribution, in particular to a distribution network fault early warning method and system. Background technique [0002] The distribution network is at the end of the power system, and has the distinctive characteristics of wide geographical distribution, large-scale power grid, various types of equipment, various network connections, and variable operation modes. With the urbanization construction and the growth of electricity demand, the distribution network has been continuously transformed and expanded, and its scale has also been continuously expanded. The scale of most county-level and above distribution networks in the State Grid Corporation system has reached hundreds of feeders. Above, the number of medium voltage feeders in some medium and large cities has reached or exceeded one thousand. [0003] In this way, driven by the development of the national economy, there has been a phenomenon of powe...

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Problems solved by technology

[0003] In this way, driven by the development of the national economy, there has been a phenomenon of power cuts; the composition of the load has changed, and the residential and commercial power consumption has increased significantly, which has increased the load on some lines and transformers, and even caused partial power outages due to overload; Due to the expansion of local faults caused by the defects of the power system itself, large-scale and long-term power outages occur; because the reactive power supply configuration and adjustment methods do not adapt to the load development, the grid voltage level cannot meet the power quality requirements, resulting in damage to electrical equipment and even occurrence of power failures. Power outage accidents caused by voltage collapse; there are problems with excessive network loss during the operation of the distribution network, etc.

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