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Non-salient pole generator stator single-phase earth fault positioning method

A single-phase ground fault and generator stator technology is applied in the field of electrical engineering to solve the problem of large positioning errors and improve fault positioning accuracy.

Active Publication Date: 2021-08-24
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] To sum up, how to provide a new fault location method for large-scale hidden pole generators to improve the accuracy of fault location has become an urgent problem to be solved by those skilled in the art

Method used

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  • Non-salient pole generator stator single-phase earth fault positioning method
  • Non-salient pole generator stator single-phase earth fault positioning method
  • Non-salient pole generator stator single-phase earth fault positioning method

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Embodiment Construction

[0027] The present application will be described in detail below with reference to the accompanying drawings and embodiments. Each example is provided by way of explanation of the application, not limitation of the application. In fact, those skilled in the art will recognize that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield a still further embodiment. Accordingly, it is intended that the present application cover such modifications and variations as come within the scope of the appended claims and their equivalents.

[0028] In the description of this application, the terms "vertical", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", " The orientation or positional relationship indicated by "top", "bottom", etc. is based on the orien...

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Abstract

The invention provides a non-salient pole generator stator single-phase earth fault positioning method and device, belongs to the field of electrical engineering, and is used for improving fault positioning precision. The method comprises the steps: obtaining the parameter values of ground capacitance and transition resistance of a non-salient pole generator after a fault occurs; based on the parameter values of the ground capacitance and the transition resistance, calculating a fault trajectory circle when each turn of the non-salient pole generator stator winding has a fault; and obtaining the real part and the imaginary part of the zero-sequence voltage of the non-salient pole generator, drawing a zero-sequence voltage trajectory circle according to the real part and the imaginary part of the zero-sequence voltage of the non-salient pole generator, and judging the distance between the zero-sequence voltage trajectory circle and each fault trajectory circle, wherein the number of turns represented by the fault trajectory circle corresponding to the minimum distance is the number of fault turns.

Description

technical field [0001] The present application relates to the technical field of electrical engineering, and more specifically, to a method for locating a single-phase ground fault of a sequestered pole generator stator. Background technique [0002] At present, the 600MW class steam turbine generator set is the main unit of thermal power generation in most countries in the world. Due to the high speed of large turbogenerators, and most of them are three-phase hidden-pole synchronous generators, after a single-phase ground fault occurs in the generator, fault location is required for quick maintenance. [0003] In the existing fault location methods, the ground fault location α and the zero sequence voltage of the generator are mostly used Fault point to neutral point potential and fault phase-to-ground transition resistance R f (hereinafter referred to as transition resistance) to achieve fault location. During the positioning process, the potential of the fault point...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/52
CPCG01R31/52Y04S10/52
Inventor 王媛媛曾祥君刘颖车三宏赵震许瑶
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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