Method for accurately positioning single-phase earth fault of generator stator

A single-phase ground fault, precise positioning technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem of poor positioning of the stator single-phase ground fault position, easy to popularize and apply, high positioning accuracy, principle simple effect

Active Publication Date: 2015-12-02
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method capable of accurately locating the stator single-phase ground fault location under va

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  • Method for accurately positioning single-phase earth fault of generator stator
  • Method for accurately positioning single-phase earth fault of generator stator
  • Method for accurately positioning single-phase earth fault of generator stator

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] 1. According to the expansion diagram of the stator winding, determine the distribution characteristics of the induced potential phasor of each turn coil of the winding normalized to the phase electromotive force.

[0024] The stator winding connection mode of each generator is determined, and the per unit value of the electromotive force phasor of each coil of the stator coil can be determined according to the winding expansion diagram, as shown in figure 1 . The phase induced electromotive force synthesized by each coil The per unit value can be set to 1, that is, the electromotive force of each turn of the stator winding is normalized to the phase electromotive force.

[0025] 2. In this method, the induced electromotive force of each coil of the stator winding takes into account the influence of the stator armature reaction, and the specific met...

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Abstract

The invention discloses a method for accurately positioning the single-phase earth fault of a generator stator. The method includes the steps of forming potential phasor distribution characteristics of each turn of stator windings gathered to phase potential according to the developed view of the stator winding, calculating the inductive electrodynamic potential of each turn of the three-phase stator windings before failure under current working conditions and the voltage phasor from any point of the stator winding to a neutral point through the voltage and current measured value at the machine end of a generator, and searching and determining the accurate position of a failure point based on the voltage phasor from the failure point to the neutral point and the potential phasor distribution characteristics of each turn of the stator windings before failure.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to the precise positioning of a generator stator single-phase grounding fault. Background technique [0002] Stator single-phase grounding is a common fault of generators, accounting for more than 60% of generator faults. Quickly and accurately determining the location of ground faults is conducive to troubleshooting of generators, improving maintenance efficiency, ensuring that generators can resume power generation as soon as possible, and reducing economic losses caused by faults. In particular, large generators, which are the main power supply for the power grid, have the characteristics of large capacity, complex structure, high cost, and difficult maintenance. Accurate positioning of the stator single-phase ground fault location is of great significance for its maintenance and recovery after the fault. [0003] However, the existing g...

Claims

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Application Information

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IPC IPC(8): G01R31/06
Inventor 尹项根张哲文明浩陈卫李金辉鲁功强
Owner HUAZHONG UNIV OF SCI & TECH
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