A single-phase disconnection fault diagnosis method for medium-voltage distribution network

Abstract

The invention discloses a single-phase disconnection fault diagnosis method for a medium-voltage distribution network, which includes the following steps: Step 1: Combining the configuration of the intelligent terminal of the medium-voltage switch and the configuration of the intelligent terminal of the distribution transformer of the low-voltage line, the main station of the distribution automation Simplified modeling of medium-voltage distribution lines; Step 2: Classify the modeled medium-voltage distribution lines according to diagnostic feasibility and accuracy, and divide them into: non-diagnosable line sections, low-accuracy diagnostic line sections, and high-accuracy diagnostic line sections. Step 3: Establish a single-phase disconnection fault diagnosis rule set, match the characteristics of the measurement data of the intelligent terminal of the medium and low voltage lines with the judgment rule set, and further locate the disconnection position of the medium voltage distribution line. The present invention can quickly and accurately diagnose the location of disconnection faults of medium-voltage distribution lines; the present invention solves the problem of single data source and low reliability of the original judgment method, and can further improve the segmentation of medium-voltage distribution lines. Refinement, further narrowing the judgment area of ​​disconnection faults, and improving the accuracy of fault location.

Description

technical field [0001] The invention relates to the field of power grid fault diagnosis, in particular to a method for diagnosing a single-phase disconnection fault of a medium-voltage distribution network. Background technique [0002] Distribution network disconnection fault is one of the common faults in distribution network. After a disconnection fault occurs on the distribution line, some users will lose power directly, and the disconnection grounding may cause electric shock accidents. At the same time, the asymmetrical voltage generated by long-term disconnection operation will cause damage to electrical equipment, so timely diagnosis of disconnection Positioning and handling faults has become an urgent need for power companies. At present, because the main station system of the power enterprise only pays attention to the measurement data at the outlet switch of the substation, there are two problems as follows: 1) If and only when the ground current is caused by the...

AI Technical Summary

Problems solved by technology

After a disconnection fault occurs on the distribution line, some users will lose power directly, and the disconnection grounding may cause electric shock accidents. At the same time, the asymmetrical voltage generated by long-term disconnection operation will cause damage to electrical equipment, so timely diagnosis of disconnection location and handling of faults has become an urgent need for power companies

At present, because the main station system of the power enterprise only pays attention to the measurement data at the outlet switch of the substation, there are two problems as follows: 1) If and only when the ground current is caused by the power side disconnection and grounding at the disconnection position, the main Only through the substation system can the line fault be found; 2) It is difficult to locate the broken line only through the measurement data at the outlet switch of the substation

Based on the above problems, current power companies still rely on user complaints to find disconnection faults, and use manual line inspection to find fault locations, and the efficiency of fault diagnosis and processing is low.

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