Method for quickly positioning and monitoring faults of power distribution network

Abstract

The invention discloses a method for quickly positioning and monitoring faults of a power distribution network, and relates to a monitoring device for faults of the power distribution network. The method is implemented by the monitoring device. The monitoring device is provided with a DSP (digital signal processor), an acquisition module, a debugging MMI (man-machine interface) and a communication module, wherein the acquisition module, the debugging MMI interface and the communication module are respectively connected with the DSP, the acquisition module comprises eight analog channels, eight state parameter reserved port acquisition and conversion circuits and acquisition and conversion circuits respectively connected with the eight analog channels and eight state parameter reserved ports, and the eight analog channels are connected with ports TV and TA. Three-phase voltage, three-phase current, zero-sequence voltage and zero-sequence current are continuously acquired from the ports TV and TA and are computed by the DSP, so that measuring and grounding faults, short-circuit faults and breakage faults can be judged. The method has the advantage that the grounding faults, the short-circuit faults and the breakage faults can be judged, quickly positioned, processed and analyzed without influence of a grounding mode of a neutral point.

Description

technical field [0001] The invention relates to a distribution network fault monitoring device, in particular to a distribution network fault rapid location monitoring method. Background technique [0002] Most of the medium and low voltage distribution networks in my country adopt the neutral point non-effective grounding operation mode, and the traditional distribution network fault location technology is mainly positioned to solve the single-phase grounding fault type. Although the regulations stipulate that the system can continue to run for 2 hours after a single-phase ground fault occurs, the single-phase ground fault can further develop into two or more point faults, which will cause accidents such as fault tripping and power failure. The existing positioning principles and solutions are mainly divided into three categories: one is the fault location method for the purpose of measuring the fault distance at the end of the line; the other is the signal injection meth...

AI Technical Summary

Problems solved by technology

The ranging method and the signal injection method are often not only difficult to implement in the actual process, but the key technical issues are not considered enough, and the anti-interference ability is poor, the practicability is not strong, and it is generally not used

The main one is the outdoor fault point detection method, and the traditional outdoor fault point detection generally uses the line fault indicator to realize the segmentation of the fault point. When a fault occurs, it is generally necessary to manually search along the line to determine the fault section. not tall

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