Abnormal voltages within transformers

Blume, L. F.; Boyajian, A.

doi:10.1109/paiee.1919.6594291

Cited by 42 publications

(24 citation statements)

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“…A common approach is the use of the ladder network model which can originally be traced back to Blume and Boyajian's work of 1919 [3]. Their work has subsequently been improved by many other researchers over the following decades including [35][36][37].…”

Section: Grey Box Transformer Modelmentioning

confidence: 99%

“…When a switching transient frequency component aligns with an internal resonance frequency within a power transformer, voltage amplification can occur which can result in a breakdown of the transformer's insulation system. This is an area of study with a long history [3], however the area is now receiving increased attention due to an increasing number of transformer failures which have been attributed to internal resonance overvoltage conditions [4,5].Working groups from both IEEE [6] and CIGRE [7] have been established to investigate ways of mitigating the problem.…”

Section: Introductionmentioning

confidence: 99%

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Analysing a power transformer’s internal response to system transients using a hybrid modelling methodology

Mitchell

Oliveira

2015

International Journal of Electrical Power & Energy Systems

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Section: Grey Box Transformer Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysing a power transformer’s internal response to system transients using a hybrid modelling methodology

Mitchell

Oliveira

2015

International Journal of Electrical Power & Energy Systems

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“…This modeling approach can be subdivided into two types namely a lumped parameter model (LPM) or a distributed parameter model (DPM) [2] [3]. The LPM (Figure 3) was used in this study due to its simplicity considering the mathematical formulation of the voltage behavior.…”

Section: A Equivalent Circuit Modelmentioning

confidence: 99%

“…The non-linear voltage distribution in machine windings when subjected to steep fronted wave excitations has been observed more than a century ago [1] [2]. The perils associated with this resonance behavior of transformer windings are also well documented [3] [4] [5].…”

Section: Introductionmentioning

confidence: 99%

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Wide band modeling of an air-core reactor for fast transient studies

Jarsveld

Nicolae

2015

2015 Intl Aegean Conference on Electrical Machines &Amp; Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Ele

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This paper presents a methodology that can be used to model the electromagnetic behavior of large disk type air-core reactors when excited by fast transient voltages having a frequency content ranging from 10 kHz to 500 kHz. A lumped parameter white-box model is generated using the design details of the reactor. The model parameters are calculated analytically and verified by measurements and finite element method simulations. The modeling methodology is applied to an actual case study and the simulation results are compared to the measured results. The measured parameter values and the model response closely matches the measured results in the case study.

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Generalized analytical formulae to compute electrical characteristics of a homogenous ladder network of the transformer winding

Mondal

Kumbhar

2018

Circuit Theory & Apps

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Many electrical systems are expressed as a complex ladder network consisting of combinations of resistances, inductances, and capacitances. Computation of electrical characteristics, such as voltages, currents, and equivalent impedances of these ladder networks require the solution of complicated differential-algebraic equations that are quite tedious and cumbersome. The earlier works have given particular attention to purely resistive ladder networks ignoring the inductance and capacitance parameters. Moreover, there are no direct expressions available to quickly compute these characteristics. This paper derives generalized analytical expressions that can be directly used to obtain the electrical characteristics of a finite as well as semi-infinite homogenous ladder network by simply plugging the values of its constituent parameters. Expressions are deduced for excitation source applied to the input terminal and across 2 arbitrary nodes, respectively. Kirchhoff mesh and node laws along with ordinary algebra and trigonometric theorems are applied to derive these expressions. Boundary-value technique is used to circuit equations to determine unknown coefficients of the expressions. The derivation given in these paper would surely help the readers to quickly compute the electrical characteristics without solving recursive circuit equations and avoiding complex state-space matrices. KEYWORDS difference equation, electrical characteristics, ladder network, transformer winding, winding response Int J Circ Theor Appl. 2018;46:911-925.wileyonlinelibrary.com/journal/cta

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Abnormal voltages within transformers

Cited by 42 publications

References 1 publication

Analysing a power transformer’s internal response to system transients using a hybrid modelling methodology

Analysing a power transformer’s internal response to system transients using a hybrid modelling methodology

Wide band modeling of an air-core reactor for fast transient studies

Generalized analytical formulae to compute electrical characteristics of a homogenous ladder network of the transformer winding

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