A simulating research on monitoring of winding deformation of power transformer by on-line measurement of short-circuit reactance

Distribution transformer constitutes a significant asset for any distribution power system. Short circuit currents or forces can cause mechanical faults in transformer winding. In order to discover the hidden trouble of the transformer, in this paper, on-line monitoring system based on FRA method is developed, and signal source, signal injection, system software are introduced. Furthermore, a nanosecond impulse signal generator is used to inject impulse signals through a noninvasive capacitive sensor, to realize on-line monitoring for winding deformation of distribution transformer. Finally, the monitoring system is validated by a corresponding experimental study.

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On-line monitoring of winding deformation of power transformer

Proceedings of 2001 International Symposium on Electrical Insulating Materials (ISEIM 2001). 2001 Asian Conference on Electrical Insulating Diagnosis (ACEID 2001). 33rd Symposium on Electrical and Electronic Insulating Materials and Applications in System ◽

10.1109/iseim.2001.973812 ◽

2002 ◽

Cited By ~ 11

Author(s):

D.K. Xu ◽

J.H. Huang ◽

Y.M. Li

Keyword(s):

Power Transformer ◽

On Line ◽

Winding Deformation

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Application of Multi-Fractal Spectrum to Analysis the Vibration Signal of Power Transformer for the Detection of Winding Deformation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.267.584 ◽

2011 ◽

Vol 267 ◽

pp. 584-589 ◽

Cited By ~ 1

Author(s):

Feng Hua Wang ◽

Jun Zhang ◽

Zhi Jian Jin ◽

Qing Li

Keyword(s):

Power Transformer ◽

Short Circuit ◽

Vibration Signal ◽

Vibration Measurement ◽

Response Curves ◽

Vibration Signals ◽

Short Circuit Test ◽

Fractal Spectrum ◽

Winding Deformation ◽

The Relationship

The method of monitoring the tank vibration is becoming an effective method to detect the winding deformation of power transformer for the reliable and secure operation of power system. In order to further identify the relationship between the winding deformation fault of power transformer and the measured tank vibration signals, the short-circuit test is done in a 220kV transformer with the developed vibration measurement system and the vibration frequency response curves for some pre-setting winding deformation faults are obtained. Multi-fractal spectrum is applied to analyze the of the obtained vibration signals when winding conditions of power transformer are changed. It is shown that multi-fractal spectrum can effectively indicate the geometric structure features of vibration signals. The parameter variations of multi-fractal spectrum are agreed well with the preset winding faults, which provides another method for the feature extraction of vibration signal to detect the winding deformation of power transformer.

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On-Line Monitoring of Winding Deformation of Power Transformer Based on ARM and FPGA

2009 International Conference on Measuring Technology and Mechatronics Automation ◽

10.1109/icmtma.2009.56 ◽

2009 ◽

Cited By ~ 4

Author(s):

Shan Zhang ◽

Zhenjiang Cai ◽

Dening Zhang ◽

Hongjuan Kao ◽

Jinwei Guo

Keyword(s):

Power Transformer ◽

On Line ◽

Winding Deformation

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Thickness Measurement in the AEM by Macintosh-Based Analysis of Two-Beam Convergent Beam Patterns

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013612x ◽

1990 ◽

Vol 48 (2) ◽

pp. 504-505

Author(s):

John F. Mansfield ◽

Douglas C. Crawford

Keyword(s):

Electron Microscope ◽

Video Camera ◽

Thickness Measurement ◽

Specimen Thickness ◽

Crystalline Materials ◽

Beam Dynamic ◽

Line Measurement ◽

On Line ◽

Image Position ◽

Convergent Beam

A method has been developed that allows on-line measurement of the thickness of crystalline materials in the analytical electron microscope. Two-beam convergent beam electron diffraction (CBED) patterns are digitized from a JEOL 2000FX electron microscope into an Apple Macintosh II microcomputer via a Gatan #673 CCD Video Camera and an Imaging Systems Technology Video 1000 frame-capture board. It is necessary to know the lattice parameters of the sample since measurements are made of the spacing of the diffraction discs in order to calibrate the pattern. The sample thickness is calculated from measurements of the spacings of the fringes that are seen in the diffraction discs. This technique was pioneered by Kelly et al, who used the two-beam dynamic theory of MacGillavry relate the deviation parameter (Si) of the ith fringe from the exact Bragg condition to the specimen thickness (t) with the equation:Where ξg, is the extinction distance for that reflection and ni is an integer.

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