Effect of transformer sizes and neutral treatments on the electromagnetic transients in transformer substations

Saied, M.M.

doi:10.1109/28.370289

Cited by 9 publications

(2 citation statements)

References 6 publications

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“…circuit parameters [14], capacitors in the power system [15,16,19], shunt reactors [17], transformer size and the neutral treatment [18] and their effect on the transients have been studied.…”

Section: Introductionmentioning

confidence: 99%

Wavelet network-based classification of transients using dominant frequency signature

Chatterjee

Chakravorti

Roy

et al. 2008

Electric Power Systems Research

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Section: Introductionmentioning

confidence: 99%

Wavelet network-based classification of transients using dominant frequency signature

Chatterjee

Chakravorti

Roy

et al. 2008

Electric Power Systems Research

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“…This paper is a further step in this direction. First, it will refine the transformer model through the use of a distributed‐parameters s ‐domain Laplace representation (Saied, 1995; Saied and Alfuhaid, 2004). The resulting closed‐form expression will enable the model application to any number of winding discs, without resorting to the complicated circuit manipulations involved in concentrated‐element analysis nor the application of circuit analysis software such as SPICE.…”

Section: Introductionmentioning

confidence: 99%

Recognition of power transformer winding movement and deformation using FRA

Saied

Al-Shaher

2007

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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PurposeThe purpose of this paper is to present a frequency domain technique for the recognition and location of winding movements and mechanical deformations in power transformers. Both, axial and radial coil movements, as well as changes in clamp pressure will be studied.Design/methodology/approachThe developed algorithm is based on using a distributed s‐domain parameter equivalent network, which is cascaded with other sections to constitute a generalized model. The frequency domain transfer admittance is used as the main criterion to recognize, identify and locate the winding movement and deformation.FindingsIn order to reduce the number of failures due to winding movements and deformations, it is suggested to measure and store the transfer admittance over frequency range 0‐10 MHz region at normal operation as saved data for comparison with the corresponding data during failure. With the proposed technique, the type and the location of eventual displacement, as well as the number discs involved can be identified.Research limitations/implicationsAlthough the simulation was based on real experimental data adopted from the literature, the algorithm should be tested for real transformers. Several checks have been conducted in order to validate the mathematical model.Originality/valueA relatively simple mathematical model has been presented. It can be used for any transformer, to check the integrity of the winding in order to meet certain degree of equipment safety and reliability.

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Recognition and Location of Transformer Winding Faults Using the Input Impedance

Al-Shaher

Saied

2007

Electric Power Components and Systems

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Effect of transformer sizes and neutral treatments on the electromagnetic transients in transformer substations

Cited by 9 publications

References 6 publications

Wavelet network-based classification of transients using dominant frequency signature

Wavelet network-based classification of transients using dominant frequency signature

Recognition of power transformer winding movement and deformation using FRA

Recognition and Location of Transformer Winding Faults Using the Input Impedance

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