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Brushless exciter armature side fault online detection device and method

A detection device and detection method technology, applied in the field of electric power system, can solve the problems of inability to apply, the difference between measurement zero drift is not large, and achieve the effects of being difficult to influence, realizing fault online detection, and high sensitivity

Active Publication Date: 2021-06-18
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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  • Brushless exciter armature side fault online detection device and method
  • Brushless exciter armature side fault online detection device and method
  • Brushless exciter armature side fault online detection device and method

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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 a brushless exciter armature side fault online detection method, which comprises the following steps: detecting the excitation winding current of a brushless exciter, and calculating the direct current component amplitude IDC of the brushless exciter, the total amount I [sigma] of each integer harmonic, the total amount I1 [sigma] of each odd harmonic and the total amount I2 [sigma] of each even harmonic; calculating a ratio K [sigma] of the I [sigma] to the IDC, a ratio K1 [sigma] of the I1 [sigma] to the IDC, a ratio K2 [sigma] of the I2 [sigma] to the IDC, and a ratio K12 [sigma] of the I1 [sigma] to the I2 [sigma]; and when the IDC is greater than the threshold fixed value Set_IDC, carrying out logic identification of an armature side fault criterion 1, a criterion 2, a criterion 3 and a criterion 4, and if yes, reporting a corresponding fault signal. The invention further discloses a brushless exciter armature side fault online detection device. The device and the method are used for realizing 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 Applications(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