Stator grounding fault positioning method and system based on third harmonic potential distribution

A stator grounding and potential distribution technology, applied in information technology support system, electrical winding test, short circuit test, etc., can solve the problems of burning stator windings and iron cores, economic losses, etc., and reduce troubleshooting workload and shutdown maintenance time Effect

Active Publication Date: 2021-12-10
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 grounding fault positioning method and system based on third harmonic potential distribution
  • Stator grounding fault positioning method and system based on third harmonic potential distribution
  • Stator grounding fault positioning method and system based on third harmonic potential distribution

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

[0038] The present invention provides a large generator stator ground fault location method based on the third harmonic potential distribution, such as figure 1 As shown, the large generator stator ground fault location method based on the third harmonic potential distribution includes:

[0039] S1. Calculate the third harmonic potential of the faulty partial winding with the third harmonic tan...

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Abstract

The invention discloses a stator grounding fault positioning method and system based on third harmonic potential distribution, and belongs to the field of generator relay protection. According to the invention, the distribution characteristics of the third harmonic potential of a winding are analyzed by taking the third harmonic slot potential as a unit, and a fault evaluation index calculation method is constructed based on a third harmonic equivalent circuit. A plurality of reference points are preset at a fault phase, fault evaluation indexes of the reference points are calculated in combination with third harmonic potential distribution, the reference point with the minimum calculated value is regarded as a fault position, and then the slot number of the fault is determined. According to the method, the positioning result can be accurate to the slot number, the fault maintenance efficiency can be effectively improved, and the method has strong robustness for the measurement error of the transition resistor.

Description

technical field [0001] The invention belongs to the field of generator relay protection, and more specifically relates to a stator grounding fault location method based on the third harmonic potential distribution. Background technique [0002] The single-phase grounding fault of the generator stator winding is the most common fault of the generator. It is mostly caused by the insulation damage between the stator winding and the iron core, and the fault location often occurs in the stator core slot. If it is not protected, it will easily 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. At present, large generators are usually equipped with dual-frequency 100% stator ground protection (fundamental zero-sequence voltage + 3rd harmonic voltage protection) and injection stator ground protection. After the ground fault occurs, the recorded wave data of the protection devi...

Claims

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Application Information

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Patent Type & Authority Applications(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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