The Design and Test of a Digital Relay for Transformer Protection

Larson, Richard R.; Flechsig, A.J.; Schweitzer, Edmund O.

doi:10.1109/tpas.1979.319292

Cited by 22 publications

(6 citation statements)

References 5 publications

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“…In [6][7][8], by making short circuit connections of the main nodes which belong to a winding, a new protection-based method is investigated for modelling and simulating internal short circuit faults in transformers. In [9], an advanced algorithm is proposed in which the power transformers protection is shown on a single-phase transformer by an equivalent circuit of inverse inductances. In [10][11], [28], one of the most important models is proposed that obtains leakage and linkage inductance and also resistance matrices to internal fault studies.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Magnetizing Inrush and Internal Faults for Three-phase Transformers

Bakhshipour

Namdari

Sedaghat

2016

IJEECS

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Section: Introductionmentioning

confidence: 99%

Modeling of Magnetizing Inrush and Internal Faults for Three-phase Transformers

Bakhshipour

Namdari

Sedaghat

2016

IJEECS

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“…Development of digital relay includes on the power protection system (PPS) a large number of facilities and improvements [1,2]. Recently, some researchers have been proposing relay models for study on several areas [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

An Overcurrent Relay Model to Adaptive Protection Applications

J�NIOR¹

2016

ELECTROTECHNICAL REVIEW

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Models are important tools to analyse performance of the components of power electric system (PES). Some researchers have been proposing relay models for a lot of analysis on the PES. However, when adaptive protection is analysed, there is not a defined model on technical literature. In this paper, a complete model for an adaptive instantaneous overcurrent relay is shown. Proposed relay allows protective settings will be send to it and update with a short time delay. Streszczenie. Przy analizie systemów energetycznych często jest używany model przekaźnika. Tak nie jest w przypadku systemów adaptacyjnych. W artykule zaproponowano przetężeniowy model przekaźnika do analizy systemów adaptacyjnych. Model umożliwia ustawianie zabezpieczeń z bardzo małymi opóźnieniami. Przetężeniowy przekaźnikowy model sieci energetycznych z adaptacyjnymi zabezpieczeniami.

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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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The Design and Test of a Digital Relay for Transformer Protection

Cited by 22 publications

References 5 publications

Modeling of Magnetizing Inrush and Internal Faults for Three-phase Transformers

Modeling of Magnetizing Inrush and Internal Faults for Three-phase Transformers

An Overcurrent Relay Model to Adaptive Protection Applications

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

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