Experimental Study of the Effects of DC-bias Current on the Power Transformer

2010 ◽  
Author(s):  
F. H. Wang ◽  
J. Zhang ◽  
Z. J. Jin ◽  
Y. F. Cao ◽  
D. Q. He ◽  
...  
Keyword(s):  
Experimental Study ◽  
Power Transformer ◽  
Bias Current ◽  
Dc Bias

Harmonics Performances of Single Phase Transformer due to DC Bias

2015 ◽  
Vol 793 ◽  
pp. 202-205 ◽  
Author(s):  
Syafruddin Hasan ◽  
Muzammir Isa ◽  
M.A. Roslan ◽  
M. Hafizi ◽  
D. Musdar ◽  
...  
Keyword(s):  
Experimental Study ◽  
Single Phase ◽  
Power Transformer ◽  
Bias Current ◽  
Half Cycle ◽  
Bias Effect ◽  
Ac Power ◽  
Dc Bias ◽  
Magnetizing Current ◽  
Even Harmonics

The investigation of the direct current (dc) bias effect on single phase power transformer through their harmonics performance is present in this paper. The experimental study is done by the dc bias current injected simultaneously with alternating current (ac) source to primary winding of transformer. The input ac voltage to primary winding is maintained constant during investigation and the dc currents increased gradually. Compare to pure ac power applied, the results show that the waveforms distorted when the dc bias exist. The pulsated waveforms are pushed to half cycle in which the bias current is in the same direction as magnetizing current (unsymmetrical pulsated) and even harmonics are significant.

Research on Vibration of Transformer with DC Bias

2012 ◽  
Vol 229-231 ◽  
pp. 859-862
Author(s):  
Bao Dong Bai ◽  
Bing Yin Qu ◽  
De Zhi Chen ◽  
Bo Zhang ◽  
Wu Hao Jia
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Vibration Frequency ◽  
Single Phase ◽  
Power Transformer ◽  
Bias Current ◽  
Manufacturing Technology ◽  
Magnetic Flux Density ◽  
Dc Bias ◽  
Transformer Model

As the manufacturing technology of transformer getting more and more mature, issue of its vibration and noise is getting more and more attention. The vibration is more obviously when the transformer is running with DC Bias. 3D field-circuit coupling models of single-phase three-column power transformer was created by ANSYS. The simulating distributions of core magnetic flux density were obtained when the model was running with DC bias current of 0A, 0.9A and 2.6A. So were the modal shapes and curve of vibration-frequency of the transformer model. The theoretical guidance of reducing transformer vibration was obtained after analyzing the simulation result.

Analysis and Research on Influence of Seam on Power Transformer's Capacity on Restraining DC Bias

2012 ◽  
Vol 229-231 ◽  
pp. 903-906
Author(s):  
De Zhi Chen ◽  
Bao Dong Bai ◽  
Bo Zhang ◽  
Wu Hao Jia ◽  
Bing Yin Qu
Keyword(s):  
Power System ◽  
Theoretical Basis ◽  
Single Phase ◽  
Power Transformer ◽  
Bias Current ◽  
Three Phase ◽  
Efficient Extraction ◽  
Dc Bias ◽  
Magnetic Resistance

Transformer is irreplaceable to make sure power system running stably. It's showed in research that magnetic resistance is relevant to capacity on restraining DC bias both in three-phase three-column transformer and three-phase five-column transformer. Magnetic resistance can be changed by changing the seam size of transformer. 3D field-circuit coupling models of single-phase four-column power transformer with two kinds of seam were created by FEA in this paper. Models were simulated with different DC bias current. The analysis result of influence of seam size on power transformer's capacity on restraining DC bias was obtained by DC bias current efficient extraction and comparison of models with different seam size, which is the theoretical basis of developing new transformer with more capacity on restraining DC bias.

Effect of No-load and Load Condition on Transformer Sound

2018 ◽  
pp. 11-15
Author(s):  
Dr. Hitesh Paghadar
Keyword(s):  
Experimental Study ◽  
Power Transformer ◽  
Load Condition ◽  
Noise Pollution ◽  
Sound Level ◽  
Measurement Scale ◽  
Dominant Factor ◽  
Public Attention ◽  
Level Measurement ◽  
Human Ear

Increasing environment noise pollution is a matter of great concern and of late has been attracting public attention. Sound produces the minute oscillatory changes in air pressure and is audible to the human ear when in the frequency range of 20Hz to 20 kHz. The chief sources of audible sound are the magnetic circuit of transformer which produces sound due to magnetostriction phenomenon, vibration of windings, tank and other structural parts, and the noise produced by cooling equipments. This paper presents the validation for sound level measurement scale, why A-weighted scale is accepted for sound level measurement, experimental study carried out on 10MVA Power Transformer. Also presents the outcomes of comparison between No-Load sound & Load sound level measurement, experimental study carried out on different transformer like - 10MVA, 50MVA, 100MVA Power Transformer, to define the dominant factor of transformer sound generation.

Effect of DC-Bias Current in Perpendicular Magnetic Recording

2004 ◽  
Vol 28 (3) ◽  
pp. 275-278
Author(s):  
K. Taguchi ◽  
S. Takahashi ◽  
K. Yamakawa ◽  
K. Ouchi
Keyword(s):  
Magnetic Recording ◽  
Bias Current ◽  
Perpendicular Magnetic Recording ◽  
Dc Bias

scholarly journals A Dual Rising Edge Shift Algorithm for Eliminating the Transient DC-Bias Current in Transformer for a Dual Active Bridge Converter

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4264
Author(s):  
Michal Gierczynski ◽  
Lech M. Grzesiak ◽  
Arkadiusz Kaszewski
Keyword(s):  
Phase Shift ◽  
Power Flow ◽  
Bias Current ◽  
Compensation Algorithm ◽  
Dual Active Bridge ◽  
Simple Implementation ◽  
Dc Bias ◽  
Fast Settling ◽  
Parameter Values ◽  
Laboratory Prototype

This paper deals with a well-known problem of the transient DC-bias current occurring during a phase shift transition in dual active bridge (DAB) DC/DC converters. This phenomenon, if not compensated, can cause damage to the converter or deteriorate its performance. One aim of this paper is to present a solution which allows for the elimination of the undesired transient DC-bias component in current waveforms. This solution is the dual rising edge shift (DRES) compensation algorithm. It provides a very simple implementation and fast settling time within the first half of a switching period. Moreover, the solution is independent on any measurements or system parameter values. It is based on the double-sided single phase shift (DSSPS) modulation, which is described in detail along with a converter model in steady-state. Then, the mechanisms leading to the transient DC-bias are explained, and the compensation algorithm is derived. The performance of the algorithm has been tested using a laboratory prototype. A comprehensive set of tests, involving rapid step changes in power flow and frequency sweep, are provided. Finally, the features of the proposed algorithm are briefly discussed.

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