Power distribution line dynamic Information-based power distribution network fault monitoring method

Abstract

The invention relates to a power distribution line dynamic Information-based power distribution network fault monitoring method and belongs to the detection field. According to the method, current and electric fields to ground of lines are monitored in real time through line state waveform detectors installed on an A-phase line, a B-phase line and a C-phase line, and short-circuit faults are detected in situ; wave recording is triggered when the current or voltage of the lines changes abnormally; short-circuit fault remote signaling signals and wave recording signals are uploaded to the master station of a system in the forms of remote signaling signals through a solar power supply terminal mounted on a tower; and the software of the master station of the system carries out short-circuit fault location according to the remote signaling signals and carries out grounding fault detection and location on the overhead lines of the power distribution network according to the waveforms of recorded waves. The power distribution line dynamic Information-based power distribution network fault monitoring method is particularly suitable for small and medium-scale urban power distribution network automation construction modes or large-scale urban power distribution network automation renovation projects.

Description

technical field [0001] The invention belongs to the field of detection, and in particular relates to a method and device for monitoring the running state of distribution network lines. Background technique [0002] In the power system, the power comes from the power plant, and is transmitted to the load side through the high-voltage or ultra-high-voltage transmission network, and then the power is distributed to users of different voltage levels by the network with a lower voltage level, which mainly plays the role of power distribution in the power grid. The network is called the distribution network, referred to as the distribution network. [0003] In the power system, the distribution network is a short board that affects the reliability of power supply for users. The investment in the distribution network is relatively insufficient, and the level of automation is low, which is a very weak link. This problem exists in all countries in the world, and this problem is more...

AI Technical Summary

Problems solved by technology

[0006] However, after a single-phase ground fault occurs, the single-phase ground fault point must be found as soon as possible to eliminate the fault.

Otherwise, the overvoltage generated by the ground fault can cause power system accidents such as cable explosion, voltage transformer PT burnout, and busbar burnout.

At the same time, if the grounding line is operated as a normal line for a long time, it will bring great hidden dangers to the safety of local residents and livestock.

In 2010, long-term operation of single-phase high-resistance grounding of power distribution overhead lines occurred in Hechi City, Guangxi, resulting in personal electric shock and death

[0010] At present, traditional fault indicators based on simple threshold method and characteristic quantity statistics cannot meet the actual needs in terms of technology and reliability.

[0011] Most distribution networks in China use a non-directly grounded neutral point system. When a single-phase ground fault occurs in this type of system, it is very difficult to find the fault point due to the small fault current and complex fault characteristics.

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