Magnetizing Inrush Phenomena in Transformer Banks

Sonnemann, W. K.; Wagner, C. F.; Rockefeller, G. D.

doi:10.1109/aieepas.1958.4500053

Cited by 64 publications

(22 citation statements)

References 3 publications

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“…Inrush current occurs in a transformer whenever the residual flux does not match the instantaneous value of the steady-state flux which would normally be required for the particular point on the voltage waveform at which the circuit is closed [14].…”

Section: Fundamentals Of Inrush Currentmentioning

confidence: 99%

A wavelet-based technique for discrimination of inrush currents from faults in transformers coupled with finite element method

Jamali

Mirzaie

Gholamian

et al. 2011

2011 IEEE Applied Power Electronics Colloquium (IAPEC)

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The phenomenon of magnetizing inrush is a transient condition, which occurs primarily when a transformer is energized. The magnitude of inrush current may be as high as ten times or more times of transformer rated current that causes malfunction of protection system. So, for safe running of a transformer, it is necessary to distinguish inrush current from fault currents .In this paper, a wavelet-based technique has been used to discriminate inrush current from faults. For this purpose, a wavelet transform (WT) concept is presented and a criterion based on different behaviors of the differential currents under fault and inrush conditions have been derived. For checking the validity of the wavelet-based technique in discriminating of inrush currents from faults a three-phase 20/63 kV transformer has been simulated in Maxwell software that is based on finite element method (FEM). Then, obtained data from different situations have been used in MATALB software for implementation of the WT technique.

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Section: Fundamentals Of Inrush Currentmentioning

confidence: 99%

A wavelet-based technique for discrimination of inrush currents from faults in transformers coupled with finite element method

Jamali

Mirzaie

Gholamian

et al. 2011

2011 IEEE Applied Power Electronics Colloquium (IAPEC)

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“…Magnetizing inrush occurs in a transformer whenever the polarity and magnitude of the residual flux do not agree with the polarity and magnitude of the ideal instantaneous value of steady-state flux [15]. Transformer energization is a typical cause of inrush currents, but any transient in the transformer circuit may generate these currents.…”

Section: A Inrush Currentsmentioning

confidence: 99%

“…• Generally contain dc offset, odd harmonics, and even harmonics [15], [16]. • Typically composed of unipolar or bipolar pulses, separated by intervals of very low current values [15], [16].…”

Section: A Inrush Currentsmentioning

confidence: 99%

A current-based solution for transformer differential protection. I. Problem statement

Guzmán¹,

Zocholl²,

Benmouyal³

et al. 2001

IEEE Trans. Power Delivery

108

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This paper analyzes the problem of transformer differential protection. First, we review the concept of transformer differential protection. We then analyze magnetizing inrush, overexcitation, and current transformer (CT) saturation phenomena as possible causes of relay misoperation. Finally, we summarize the existing methods for discriminating internal faults from inrush and overexcitation conditions. In Part II of the paper, we propose a new approach for transformer differential protection and describe the relay that is based on this approach.Index Terms-Differential protection, power transformer protection, protective relaying.

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“…Narayana Prasad Padhy is with the Department of Electrical Engineering, Indian Institute of Technology, Roorkee, India (email:nppeefee@iitr.ac.in). current which leads to maloperation of a differential relay [2]- [3]. In addition, saturated current transformer during severe external fault may have high magnitude which may cause a maloperation [4]- [5].…”

Section: Introductionmentioning

confidence: 99%

An Empirical Fourier Transform-Based Power Transformer Differential Protection

Murugan

Simon

Sundareswaran

et al. 2017

IEEE Trans. Power Delivery

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This paper presents a novel approach for the power transformer differential protection based on empirical Fourier transform (EFT). The EFT is a novel transform technique, which is derived from discrete Fourier transform (DFT) with certain modifications based on the nature of current waveforms during internal fault, inrush and current transformer (CT) saturation. The fundamental component estimated by EFT is equal to DFT estimation for internal fault currents and zero or very low value for inrush currents and CT saturation currents. The fundamental component estimated by EFT is used in the biased restraint characteristic with a deviation factor (DF) to make tripping decisions for relays. The DF describes the waveform deviation rate of differential current waveform from a pure sinusoidal waveform. The proposed EFT based differential protection algorithm (EFT-DPA) is validated and compared with the conventional DFT based differential protection algorithm (DFT-DPA) through modeling for an existing real time power transformer in Tamil Nadu Transmission Corporation Limited (TANTRANSCO), Tamilnadu, India. Also, the performance of the EFT-DPA is investigated with the fault recorder data taken from the field differential relay of the same power transformer. The power transformer modeling is carried using PSCAD and the EFT-DPA is implemented in MATLAB. Index Terms-Powertransformer differential protection, Fourier transform, internal fault, inrush current, CT saturation. M. Senthil Kumar received the B.E. degree in electrical and electronics engineering, and the M.E.

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Magnetizing Inrush Phenomena in Transformer Banks

Cited by 64 publications

References 3 publications

A wavelet-based technique for discrimination of inrush currents from faults in transformers coupled with finite element method

A wavelet-based technique for discrimination of inrush currents from faults in transformers coupled with finite element method

A current-based solution for transformer differential protection. I. Problem statement

An Empirical Fourier Transform-Based Power Transformer Differential Protection

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