Comparison of Mechanically and Electrically Excited Vibration Frequency Responses of a Small Distribution Transformer

Yuxing, Wang; Pan, Jie

doi:10.1109/tpwrd.2014.2383390

Cited by 54 publications

(21 citation statements)

References 14 publications

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“…13 A sinusoidal voltage signal from a signal generator (Agilent, 33120A) was amplified by using a power amplifier (Yamaha, P2500S), and then a variac. As a result, a 200-V voltage at each test frequency was applied to the primary input of the model transformer.…”

Section: Description Of Experimentsmentioning

confidence: 99%

“…13 The nominal clamping forces set by Universal Transformer were approximately 2250 N in the winding and 1500 N in the core. These two values were converted from the tightening torque by considering the bolt diameters, thread lead angle, etc.…”

Section: Description Of Experimentsmentioning

confidence: 99%

“…Based on the experimental methodology described in a previous article, the vibration FRFs under mechanical and electrical excitations were measured. 13 Spatially averaged FRFs with different core clamping forces are presented in Fig. 2, where a 5 dB offset from the FRF underneath is introduced for clarity.…”

Section: Vibration Changes Due To Core Loosenessmentioning

confidence: 99%

“…The previous work by Wang and Pan examined the vibration FRFs of a model power transformer to the electrical excitation. 13 However, their changes to different failure causes and corresponding change sensitivities have not been inferred.…”

Section: Introductionmentioning

confidence: 99%

“…13 Research focusing on this work featured a sensitivity analysis of the mechanically and electrically excited FRFs of a model transformer to the causes of faults. Experimental evidence was presented to show the quantitative description of the causes of artificial faults and to extract features of variations of FRFs that might be useful to the vibration-based detection of the causes of transformer faults in general.…”

Section: Introductionmentioning

confidence: 99%

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Changes to the Vibration Response of a Model Power Transformer with Faults

Yuxing¹

2016

IJAV

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Current vibration-based techniques for transformer condition monitoring mostly rely on the vibration response caused by operating excitations, which consist of electrical excitations from the core and winding. Therefore, it is worthwhile to study the electrically-excited frequency response function (FRF), as it carries information of transformer mechanical and electromagnetic properties. This paper includes a sensitivity analysis of the mechanically and electrically excited FRFs of a model transformer to the reasons behind its failures. A model power transformer is used as an example to demonstrate the variation of its vibration response to a couple of causes of transformer faults, such as looseness of clamping forces in winding and core. Experimental evidence is presented to show the quantitative description of the causes of artificial faults and to extract features of variations of FRFs that might be useful to the vibration-based detection of the causes of transformer faults in general.

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Section: Description Of Experimentsmentioning

confidence: 99%

Section: Description Of Experimentsmentioning

confidence: 99%

Section: Vibration Changes Due To Core Loosenessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changes to the Vibration Response of a Model Power Transformer with Faults

Yuxing¹

2016

IJAV

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Tank Vibration Analysis of an Extra‐High‐Voltage Transformer

Konishi¹,

Κato²,

Hasegawa³

et al. 2020

IEEJ Transactions Elec Engng

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In recent years, measurement of transformer vibration is being carried out as a means of detecting the looseness and deformation of its windings. Conventionally, the vibration components of even multiples of the power supply frequency (electrically generated vibration) were analyzed to diagnose the transformer. On the other hand, the natural vibrational frequencies of the winding structures represent their conditions, and the changes of these frequencies must be representing the changes in their pre‐stress or displacement. We have measured the tank vibration of an extra‐high‐voltage transformer and investigated the dependence of load current, voltage, and temperature of the oil. As a result, although the electrically generated vibration has a complicated dependence, the winding's natural frequency is not affected by the current and voltage, and the influence of the oil temperature is not very large. It is considered that the natural vibrational frequencies of the windings are a suitable index for transformer diagnosis. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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