Ferroresonance Phenomenon in Power Transformers - Experimental Assessment

Abdallah, Ali; El‐Kady, M. A.

doi:10.4197/eng.16-1.5

Cited by 10 publications

(8 citation statements)

References 4 publications

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“…It generally occurs when the system is unbalanced, like switching or the series connections of the capacitors with transformer magnetizing impedance. This situation can result in over-voltages that can cause failures in transformers, cables, and arresters [1][2][3][4][5][6][7][8][9]. The ferroresonance phenomenon composes to the high voltage levels because -1 -of the relative ratios of losses, magnetizing impedance and cable capacitance fall into its more favorable range [5,6,8].…”

Section: Introductionmentioning

confidence: 99%

“…Also, the abnormal rates of harmonics and transient or steady-state over-voltages can often be dangerous for most electrical equipments in the power systems [10,11]. Therefore, in the related literature, the ferroresonance is defined as a general term applied to a wide variety of interactions between capacitors and iron-core inductors that result in unusual voltages and/or currents [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…This situation can result in over-voltages that can cause failures in transformers, cables, and arresters [1][2][3][4][5][6][7][8][9]. The ferroresonance phenomenon composes to the high voltage levels because -1 -of the relative ratios of losses, magnetizing impedance and cable capacitance fall into its more favorable range [5,6,8]. Also, the abnormal rates of harmonics and transient or steady-state over-voltages can often be dangerous for most electrical equipments in the power systems [10,11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Continuous wavelet transform for ferroresonance phenomena in electric power systems

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Ekren

Şeker

et al. 2013

International Journal of Electrical Power & Energy Systems

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Continuous wavelet transform for ferroresonance phenomena in electric power systems

Akıncı

Ekren

Şeker

et al. 2013

International Journal of Electrical Power & Energy Systems

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“…The ferroresonant conditions generally occur when the system is unbalanced, like switching or the serial connections of the capacitors with transformer magnetizing impedance. This situation causes failures in transformers, cables, and arresters as well as overvoltages [1][2][3][4][5][6][7][8][9][10][11][12][13]. The ferroresonance phenomenon is more prevalent at high voltage levels since the relative ratios of losses, magnetizing impedance and cable capacitance fall into their more favorable ranges here [7,8,10].…”

mentioning

confidence: 99%

“…In addition, the abnormal rates of harmonics can often be dangerous for most electrical equipment in power systems. Therefore, in the related literature, the ferroresonance phenomenon is defined as a general term, which is applied to a wide variety of the interactions between capacitors and iron-core inductors [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

mentioning

confidence: 99%

Spectral and statistical analysis for ferroresonance phenomenon in electric power systems

2011

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This study presents our findings on the ferroresonance phenomenon for the Seyitomer-Isiklar part of the Electric Power System of 380 kV in Turkey. In this context, the power spectral density approach and Short-Time Fourier Transforms are applied to the voltage variations for phase R of the sample power network. The findings show that the ferroresonance event can be represented by the interharmonics between 50 and 250 Hz, as well as statistical properties. In addition, a histogram of the ferroresonance region shows a different characteristic from the overall data and the nonferroresonance region. This different characteristic can be defined by an asymmetrical distribution characteristic, and its numerical measure is given by the "Noise to Signal Ratio" of 0.624.

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Memristor emulator – a nonlinear load for reduction of ferroresonance in a single-phase transformer

Sridharan

Sugumaran

2020

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Purpose An annual substation equipment failure report says 3/7 capacitive voltage transformer (CVT) got damaged because of ferroresonance overvoltage. The conventional mitigation circuit fails to protect the transformer as the overvoltage may fall in the range between 2 and 4 per unit. It is necessary to develop a device to suppress the overvoltage as well as overcurrent of the CVT. This study aims to propose the suitability of memristor emulator as a mitigation circuit for ferroresonance. Design/methodology/approach The literature implies that a nonlinear circuit can protect the transformer against ferroresonance. An attempt is made with a memristor emulator using Operational Amplifier (OPAMP) for the mitigation of ferroresonance in a prototype transformer. The circuit is simulated using PSpice and validated for its ideal characteristics using hardware implementation. The nonlinear memductance is designed which is required to mitigate the ferroresonance. The mitigation performance has been compared with conventional method along with fast Fourier transform (FFT) analysis. Findings While the linear resistor recovers the secondary voltage by 74.1%, the memristor emulator does it by 82.05% during ferroresonance. Also, the total harmonic distortion (THD) of ferroresonance signal found to be 22.06% got improved as 2.56% using memristor emulator. Research limitations/implications The suitability of memristor emulator as a mitigation circuit for ferroresonance is proposed in this paper. As ferroresonance occurs in instrument transformers which have extra high voltage (EHV) rated primary windings and (110 V/[110 V/1.732]) rated secondary windings, the mitigation device is proposed to be connected as a nonlinear load across the secondary windings of the transformer. This paper discusses the preliminary work of ferroresonance mitigation in a prototype transformer. The mitigation circuit may have memristor or meminductor for ferroresonance mitigation when they are commercially available in future. Practical implications The electronic component-based memristor emulator may not work at 110 V practically as they may be rated at low power. Hence, chemical component-based memristor emulator was developed to do the same. The authors like to clarify that the memristor will be a solution for ferroresonance in future not the memristor emulator circuit. Social implications With the real form of memristor, the transistor world will be replaced by it and may have a revolution in the field of electronics, VLSI, etc. This contribution attempts to project the use of memristor in a smaller scale in high-voltage engineering. Originality/value The electronic component-based memristor emulator is proposed as a mitigation circuit for ferroresonance. The hypothesis has been verified successfully in a prototype transformer. Testing circuit of memristor emulator involves transformer, practically. The mitigation performance has been compared with conventional method technically and justified with FFT analysis.

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Ferroresonance Phenomenon in Power Transformers - Experimental Assessment

Cited by 10 publications

References 4 publications

Continuous wavelet transform for ferroresonance phenomena in electric power systems

Continuous wavelet transform for ferroresonance phenomena in electric power systems

Spectral and statistical analysis for ferroresonance phenomenon in electric power systems

Memristor emulator – a nonlinear load for reduction of ferroresonance in a single-phase transformer

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