Method for detecting turn-to-turn short circuit fault of stator winding of generator

A technology of inter-turn short circuit fault and generator stator, which is applied in the detection field, can solve problems such as ground short circuit fault and short circuit current increase, and achieve the effect of easy maintenance and repair

Active Publication Date: 2016-08-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

[0002] Stator winding turn-to-turn short circuit is a common fault of generators, which may be induced by aging insulation, overvoltage shock and mechanical vibration, etc. Turn-to-turn short circui

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  • Method for detecting turn-to-turn short circuit fault of stator winding of generator
  • Method for detecting turn-to-turn short circuit fault of stator winding of generator
  • Method for detecting turn-to-turn short circuit fault of stator winding of generator

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Embodiment Construction

[0020] In order to illustrate the specific operation process of the detection method of the present invention more accurately and clearly, the applicant explained the principle, implementation process and calculation method of the detection method of the present invention in conjunction with the accompanying drawings. The specific implementation process disclosed below is only illustrative, and does not constitute a particular limitation to the present invention.

[0021] In the following, the symbols of each technical vocabulary adopt the standard usage in this field, and the corresponding meanings of the symbols are respectively I a , I b , I c is the phase current value measured in each phase; f(α m ,, t) is the air gap magnetic potential during normal operation; F r Main magnetic potential, F s is the armature reaction magnetic potential, F 1 For the synthetic magnetic potential, ω=2πf r is the rotor mechanical angular frequency, f r is the mechanical frequency of t...

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Abstract

The invention discloses a method for detecting a turn-to-turn short circuit fault of a stator winding of a generator. The method comprises the following steps: 1) collecting current signals of a three-phase winding of a stator by means of a current transformer, and outputting the current signals to a collector; 2) comparing the current signals of the three-phase winding, and determining a phase where a turn-to-turn short circuit fault of a stator winding is located. In a further improvement of the invention, a method for calculating a short circuit fault degree m using a ratio of three-phase currents Ia1, Ib1 and Ic1 in case of a short circuit fault on the basis of determining the phase where the turn-to-turn short circuit fault of the stator winding is located is also disclosed. The technical solution disclosed by the invention can simply, quickly and reliably determine the turn-to-turn short circuit fault of the stator winding inside the generator, the defects of a traditional diagnosis technology having the main characteristic of rotor vibration are overcome, and the generator is convenient to maintain and repair.

Description

technical field [0001] The invention relates to a method for measuring the orientation and degree of an inter-turn short-circuit fault of a stator winding inside a generator, and belongs to the technical field of detection. Background technique [0002] Stator winding turn-to-turn short circuit is a common fault of generators, which may be induced by aging insulation, overvoltage shock and mechanical vibration, etc. Turn-to-turn short circuit fault will cause a significant increase in short circuit current. If it cannot be found and dealt with in time , it is easy to develop into a grounding short circuit fault, causing serious accidents. [0003] In the multi-phase multi-branch synchronous motor, the inter-turn short circuit of the stator winding can be divided into the same branch short circuit, the same phase different branch short circuit and the out-of-phase short circuit. Short circuit, in actual operation, most turn-to-turn short circuits are on the same branch and a...

Claims

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 何玉灵邓玮琪唐贵基
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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