Modeling transformer internal faults using Matlab

Elrefaie, H.B.; Megahed, A.I.

doi:10.1109/melecon.2002.1014563

Cited by 15 publications

(7 citation statements)

References 3 publications

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“…Oil is used for isolation and cooling of transformers [19]- [23]. The isolation of the oil varies according to the rate of moisture, water and foreign substances in its content [24]- [27]. This is due to the fact that the tap changer has a movable structure and because of the arcs formed during the on-load tap-change operation, the insulating oil of the stage is contaminated more quickly.…”

Section: Test Analysis In Power Transformersmentioning

confidence: 99%

Routine Test Analysis in Power Transformers by Using Firefly Algorithm and Computer Program

Zile

2019

IEEE Access

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Faults that occur during the transmission and distribution of energy usually occur in power transformers. The interruptions in the transformers, the voltage drops, the sudden interventions in the over currents cause important problems. For this reason, power transmission and distribution companies should perform routine tests and transformers more effectively. In this study, transformer routine tests have been analyzed by using the generated firefly algorithm. Data from sensor and measuring instruments in the transformer units obtained. A data collection system consisting of hardware and software has been created to collect the data and transfer it to the computer center. Electronic hardware has been utilized for transferring data from sensors connected to different units of transformer to computer. The data received from the transformer has been synchronized with the PIC microcontrollers in the designed circuit and transferred quickly and safely to the computer by means of the USB port. An interface written in Visual Studio programming language has been created in order to present the analog signals in digital format to the user in a visual way. The voltage values obtained from the sensors have been displayed on the Transformer Routine Test Analysis Program screen created on the computer. The measurement accuracy and success of the designed software and hardware have been tested on real system. The data obtained showed that the system is successful. Thus, remote monitoring, control and routine testing of transformers with the software and hardware created have been realized.

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Section: Test Analysis In Power Transformersmentioning

confidence: 99%

Routine Test Analysis in Power Transformers by Using Firefly Algorithm and Computer Program

Zile

2019

IEEE Access

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“…Thus, it is difficult to find a suitable way to model the transformer in that condition. Some literatures are available in the field of the internal fault analysis of the transformer . The most widely known transformer model to turn faults analysis is the one presented by Bastard et al .…”

Section: Introductionmentioning

confidence: 99%

“…A literature survey represents that the methods for modeling and simulation of the transformer winding faults may be classified into two major groups. One is that the electrical parameters of the faulty transformer are calculated using transformer electric‐equivalent circuit model , and the other is based upon the magnetic circuit calculations . The first simulation model could not really reflect the magnetic transient process when the internal short circuit fault of a transformer happens, and the implementation of the latter one needs a detailed knowledge of the transformer magnetic behavior.…”

Section: Introductionmentioning

confidence: 99%

“…The first simulation model could not really reflect the magnetic transient process when the internal short circuit fault of a transformer happens, and the implementation of the latter one needs a detailed knowledge of the transformer magnetic behavior. Nevertheless, none of the studies take account of the influence of nonlinearity and high‐frequency effects on the transformer behavior under fault conditions.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of internal winding short circuit faults in power transformers using transient finite element method coupling with external circuit equations

Behjat

Vahedi

2013

Int J Numerical Modelling

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Interturn short circuit faults are the leading cause of power transformer failures. If not quickly detected, these faults usually develop into more serious faults, which would result in irreversible damage to the transformer, unexpected outages, and consequential costs. The aim of this research is to obtain a better understanding of the physical behavior of the power transformers in the presence of interturn faults as well as to discover the best indicators for detection of interturn short circuit faults. To this end, a time stepping finite element model of power transformer has been developed to analyze the transient behavior of a real power transformer when the transformer is working under winding short circuit fault conditions. The transient model, coupled with external circuit equations, allows us to simulate the dynamic behavior of the transformer with the real power supply and external loads connections. The FEM computations show the ability of the electromagnetic flux inside the transformer, transformer terminal currents, and circulating current in the shorted turns as useful monitoring parameters for transformer fault detection.undergoes a gradual aging process before such a fault happens. Aging of the insulation alters the electrical properties of the system adversely and reduces both the mechanical and dielectric-withstand strength. In an aging transformer, the conductor insulation is weakened to the point where it can no longer sustain much additional stress. Under increased stress, for example, because of some external fault, excessive overloading, or an impulse voltage, insulation between adjacent turns suffers a dielectric failure, and a turn-to-turn fault develops. If left undetected, turn faults can propagate, leading to catastrophic phase-ground or phase-phase faults, which will finally cause the whole transformer breakdown. If the fault is detected at an early stage, the damage is minor, and the transformer can be quickly put back into service by just repairing the source of the failure; on the other hand, replacing the whole transformer means increased cost and downtime and decreased quality of service.To make an accurate fault detection system, analyzing the local and global effects of the faults on the transformer behavior is inevitable. There are many technical and economic limitations to generate internal faults in an actual transformer, leading therefore to the use of models of damaged transformers for the purpose of this study. The biggest challenge in modeling the transformer with internal faults is its more complexity, because the electromagnetic field picture, inside the transformer, totally changes because of the fault that will affect the transformer model parameters. Thus, it is difficult to find a suitable way to model the transformer in that condition. Some literatures are available in the field of the internal fault analysis of the transformer [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The most widely known transformer model to turn faults analysis is the one ...

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“…There are several researches in the area of simulation of internal faults in a power transformer [1]- [4]. Nevertheless; all of these methods consider that the transformer is separated from the network.…”

Section: Introductionmentioning

confidence: 99%

Calculation of transformer internal faults in short circuit analysis

Ghanavati

Kouhsari

Koochaki

et al. 2008

2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century

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this paper presents a novel method of modeling internal faults in a power transformer. The method leads to a model which is compatible with commercial phasor-based software packages. Consequently; it enables calculation of fault currents in any branch of the network due to a winding fault of a power transformer. These currents can be used for evaluation of protective relays' performance and can lead to better setting of protective functions.

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Modeling transformer internal faults using Matlab

Cited by 15 publications

References 3 publications

Routine Test Analysis in Power Transformers by Using Firefly Algorithm and Computer Program

Routine Test Analysis in Power Transformers by Using Firefly Algorithm and Computer Program

Analysis of internal winding short circuit faults in power transformers using transient finite element method coupling with external circuit equations

Calculation of transformer internal faults in short circuit analysis

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