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Stator ground fault location method and system based on third harmonic potential distribution

A stator grounding and fault location technology, used in information technology support systems, electrical winding testing, short-circuit testing, etc., can solve the problems of burning stator windings and iron cores, economic losses, etc., to reduce the workload of troubleshooting and downtime for maintenance. Effect

Active Publication Date: 2022-05-31
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is not protected, it is easy to develop into a short circuit between turns or a short circuit between phases, thereby burning the stator winding and iron core, causing huge economic losses

Method used

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  • Stator ground fault location method and system based on third harmonic potential distribution
  • Stator ground fault location method and system based on third harmonic potential distribution
  • Stator ground fault location method and system based on third harmonic potential distribution

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Embodiment Construction

[0040] The present invention does not limit the connection mode of the generator winding. Specifically, step S1 specifically includes:

[0043]

[0046]

[0048] Taking the winding connection form shown in FIG. 2 as an example, the third harmonic potential distribution is shown in FIG. 3 . It should be understood that the present invention

[0050]

[0052]

[0055]

[0058]

[0060]

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Abstract

The invention discloses a stator grounding fault location method and system based on the third harmonic potential distribution, and belongs to the field of generator relay protection. The invention uses the third harmonic slot potential as a unit to analyze the distribution characteristics of the third harmonic potential of the winding, and constructs a fault evaluation index calculation method based on the third harmonic equivalent circuit. Multiple reference points are preset in the fault phase, and the fault evaluation index of each reference point is calculated in combination with the third harmonic potential distribution. The reference point with the smallest calculated value is regarded as the fault location, and then the slot number where the fault is located is determined. This method can accurately locate the result to the slot number, can effectively improve the troubleshooting efficiency, and has strong robustness to the measurement error of the transition resistance.

Description

Method and system for stator ground fault location based on third harmonic potential distribution technical field The invention belongs to the generator relay protection field, more specifically, relate to the stator based on the third harmonic potential distribution Ground fault location method. Background technique The single-phase grounding fault of the generator stator winding is the most common fault of the generator, which is mostly caused by the stator winding and the iron. The insulation failure between the cores results in the fault location often occurring in the stator core slots. If not protected, it is easy to evolve into short inter-turn Road or phase-to-phase short circuit, thereby burning the stator winding and iron core, causing huge economic losses. At present, large generators are usually equipped with Dual-frequency 100% stator grounding protection (fundamental zero-sequence voltage + 3rd harmonic voltage protection) and injection-type stator gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/52G01R31/72
CPCG01R31/52G01R31/72Y04S10/52
Inventor 尹项根乔健王义凯谭力铭徐雯张哲文明浩陈卫
Owner HUAZHONG UNIV OF SCI & TECH
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