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Isolation transformer

About: Isolation transformer is a research topic. Over the lifetime, 8145 publications have been published within this topic receiving 72396 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a new scheme for power transformers protection based on the analysis of the harmonic content of the differential current Park's vector modulus is presented. But the proposed method is unable to detect turn-to-turn winding insulation failures, and to distinguish them from magnetising inrush current transients.
Abstract: This study presents a new scheme for power transformers protection, which is based on the analysis of the harmonic content of the differential current Park's vector modulus. The proposed method is able to detect turn-to-turn winding insulation failures, and to distinguish them from magnetising inrush current transients. Experimental and simulation results are presented and discussed.

43 citations

Proceedings ArticleDOI
01 Dec 2008
TL;DR: In this article, the impact of harmonics on transformers is evaluated using analysis and simulations in MATLAB/Simulink based on useful model of transformer under harmonic condition and results are compared.
Abstract: The significance of harmonics in power systems has increased substantially due to the use of solid state controlled loads and other high frequency producing devices. An important consideration when evaluating the impact of harmonics is their effect on power system components and loads. Transformers are major components in power systems. Supplying non-linear loads by transformer leads to higher losses, early fatigue of insulation, and reduction of the useful life of transformer. To prevent these problems rated capacity of transformer supplying non-linear loads must be reduced. This paper reviews the non linear loads effects on the transformers and the standard IEEE procedures for derating of the transformers which are under distorted currents. The equivalent losses and capacity of a typical 25 KVA single phase transformer is then evaluated using analysis and simulations in MATLAB/Simulink-based on useful model of transformer under harmonic condition- and results are compared.

43 citations

Patent
16 Jul 2009
TL;DR: In this article, an open loop power switcher, a power isolation transformer, a backlight driving circuit, and a power circuit are employed to convert a direct current (DC) power into an alternating current (AC) input voltage.
Abstract: A power supply apparatus includes an open loop power switcher, a power isolation transformer, a backlight driving circuit, and a power circuit. The open loop power switcher converts a direct current (DC) power into an alternating current (AC) input voltage. The power isolation transformer is coupled to the open loop power switcher and includes a primary-side winding, a first winding, and a second winding, wherein the first and second windings are disposed at the secondary-side of the power isolation transformer, and the first winding is employed for generating a first voltage signal according to the AC input voltage. The backlight driving circuit is employed for driving a backlight module according to the first voltage signal. The power circuit is employed for receiving a second voltage signal generated from the second winding according to the AC input voltage, in order to generate an output power signal.

43 citations

Proceedings ArticleDOI
14 Mar 1999
TL;DR: In this paper, the authors derived the explicit equation of the bias of the magnetizing current for the first time and provided the transformer design procedures according to the derived equations, and showed that the bias can saturate the transformer core, cause diode reverse recovery problem, and make the active clamp switch lose zero voltage turn-on.
Abstract: In the forward converter with active-clamp reset circuit, the leakage inductance of the transformer and the parasitic capacitances of the switches produce a DC bias of the magnetizing current of the transformer. The DC bias of the magnetizing current could saturate the transformer core, cause diode reverse recovery problem, and make the active clamp switch lose zero voltage turn-on if the bias is not considered in the transformer design. This paper derives the explicit equation of the DC bias of the magnetizing current for the first time and provides the transformer design procedures according to the derived equations.

43 citations

Patent
26 Jul 1996
TL;DR: In this article, the turns ratio between the primary (4) winding and the secondary (6) winding of a power transformer (2) provided with at least one regulating winding is calculated.
Abstract: In a method and a device for continuously adjusting, within a certain adjustment range, the turns ratio between the primary (4) winding and the secondary (6) winding of a power transformer (2) provided with at least one regulating winding, a first tap (6a, 6b, 6c, 6d) is switched on during a portion of a cycle of the alternating voltage of the transformer (2) and a second tap (6b, 6c, 6d, 6a) is switched on during another portion of the cycle of the alternating voltage. For this purpose, the device comprises electronic switches (8a, 8b, 8c, 8d, 10a, 10b, 10c, 10d) in the form of thyristors or transistors.

43 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202251
202144
2020151
2019211
2018266