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Device and method for on-line detection of fault on armature side of brushless exciter

A detection device and exciter technology, which is applied in the field of power system, can solve the problems of inapplicability, small difference in measurement zero drift, etc., and achieve the effect of not being easily affected, realizing fault online detection, and high sensitivity

Active Publication Date: 2022-03-29
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent application number CN200910183871.0 proposes a method for judging a rotating diode fault, using the ratio of the effective value of the 1st, 2nd, 3rd, 4th, 5th, and 6th harmonics to the effective value of the 22nd harmonic for judgment, which has a large innovative, but in actual engineering applications, because the 22nd harmonic component is very small, which is not much different from the measurement zero drift, there may be situations where it cannot be applied on site

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  • Device and method for on-line detection of fault on armature side of brushless exciter
  • Device and method for on-line detection of fault on armature side of brushless exciter
  • Device and method for on-line detection of fault on armature side of brushless exciter

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Embodiment 1

[0103] Based on the above device, the present invention also provides Embodiment 1 of an online fault detection method on the armature side of a brushless exciter, which includes the following steps:

[0104] S110: collect the excitation winding current of the exciter, and calculate its DC component I DC , each integer harmonic total I Σ , the total amount of odd harmonics I 1Σ And the total amount of each even-numbered harmonic I 2Σ .

[0105] S120: Calculate I Σ with I DC The ratio of K Σ , I 1Σ with I DC The ratio of K 1Σ , I 2Σ with I DC The ratio of K 2Σ , I 1Σ with I 2Σ The ratio of K 12Σ .

[0106] S130: When I DC Greater than the threshold set value Set_I DC , the following criterion identification is carried out:

[0107] Criterion 1: If K Σ Greater than the threshold set value Set1_K Σ , it is judged to be abnormal on the armature side;

[0108] Criterion 2: If K Σ Greater than the threshold set value Set2_K Σ , and the ratio K 12Σ Greater tha...

Embodiment 2

[0111] Embodiment 2 of an online fault detection method on the armature side of a brushless exciter according to the present invention includes the following steps:

[0112] S210: Collect the excitation winding current of the exciter and calculate its DC component I DC , each integer harmonic total I Σ , the total amount of odd harmonics I 1Σ And the total amount of each even-numbered harmonic I 2Σ .

[0113] S220: Calculate I Σ with I DC The ratio of K Σ , I 1Σ with I DC The ratio of K 1Σ , I 2Σ with I DC The ratio of K 2Σ , I 1Σ with I 2Σ The ratio of K 12Σ .

[0114] Among them, the total number of harmonics of each integer order I Σ The calculation formula is:

[0115] I Σ =F(I j );

[0116] Among them, I j is the effective value of each integer harmonic component in the excitation winding current of the exciter, j=1, 2,..., N, N is a natural number, F(I j ) for the I j The relevant calculation function adopts a sum function, a total effective value ...

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Abstract

The invention discloses an online fault detection method of the armature side of a brushless exciter. By detecting the excitation winding current of the brushless exciter, the DC component amplitude I is calculated. DC , each integer harmonic total I Σ , the total amount of odd harmonics I 1Σ And the total amount of each even-numbered harmonic I 2Σ ; calculate I Σ with I DC The ratio of K Σ , I 1Σ with I DC The ratio of K 1Σ , I 2Σ with I DC The ratio of K 2Σ , I 1Σ with I 2Σ The ratio of K 12Σ ; when I DC Greater than the threshold set value Set_I DC , the logic identification of armature side fault criterion 1, criterion 2, criterion 3, and criterion 4 will be carried out, and if it is satisfied, the corresponding fault signal will be reported. The invention also discloses an online fault detection device on the armature side of the brushless exciter. The device and method are used to realize the online fault detection of the armature side of the brushless exciter.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to an online fault detection device and method for an armature side of a brushless exciter. Background technique [0002] The faults on the armature side of the brushless exciter are mainly divided into rectifier open circuit faults and armature winding inter-turn short circuit faults. The open circuit fault of the rectifier is divided into one-tube open circuit of rotating diode, single-phase open circuit of rotating diode and multi-phase open circuit of rotating diode. At present, for rectifier open-circuit faults, the rotating diode non-conduction detection system DNC (Diode Non-conduction Detection System) is generally used to detect, but it has a large maintenance workload, and the long-term operation of the sensor has the problem of waveform degradation, distortion, and false signal transmission. [0003] Chinese patent application number CN200910183871.0 proposes a m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
CPCG01R31/346G01R31/34
Inventor 李华忠王光陈俊张琦雪牟伟徐天乐王凯钟守平郭自刚陈佳胜
Owner NR ELECTRIC CO LTD