Resonant behavior of EHV transformer windings under system originated oscillatory transient over voltages

Mitra, Poulomi; De, Abhinandan; Chakrabarti, A.

doi:10.1016/j.ijepes.2011.08.019

Cited by 12 publications

(3 citation statements)

References 13 publications

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“…La resonancia interna en transformadores es un fenómeno recientemente reportado en la literatura especializada (Mitra et al, 2011). Este fenómeno explica por qué ocurren fallas internas ocasionadas por sobretensiones, en los transformadores, aunque éstos se encuentren protegidos con apartarrayos, instalados en sus terminales de línea.…”

Section: Garcíaunclassified

Sobretensiones en Arrancadores con Autotransformador Causadas por la Desconexión del Interruptor Principal en el Arranque de los Motores

et al. 2018

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Se discuten tres fallas, que se presentaron en el lado línea, de tres arrancadores con autotransformador de 13.8 kV. Las fallas fueron ocasionadas por sobretensiones, generadas por el fenómeno de re-encendidos múltiples y escalación de tensiones, el cual, a su vez, fue ocasionado por la apertura del interruptor principal, durante el proceso de arranque de los motores. Este mecanismo de falla es diferente a los que han sido reportados en la literatura especializada, ocasionados por la apertura del interruptor del neutro o por el cierre del interruptor principal, durante el arranque de los motores. Para proteger a los arrancadores contra las sobretensiones en el lado línea, es necesario instalar, en esta zona, una combinación de apartarrayos y supresores de transitorios RC. Los apartarrayos cortan la magnitud de la sobretensión y los supresores modifican su frecuencia. Esto minimiza las posibilidades de que se generen re-encendidos múltiples y escalación de tensiones.

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Section: Garcíaunclassified

Sobretensiones en Arrancadores con Autotransformador Causadas por la Desconexión del Interruptor Principal en el Arranque de los Motores

et al. 2018

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“…If the harmonic frequencies of the currents are close to the system's parallel resonant frequencies, the voltage magnification in the system will be very high, especially in critical resonance situations. This can lead to malfunctions or, in the worst case, damage to electrical system equipments [6].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Study Approach for Evaluation of Resonance and Ferro-Resonance in HV Substations A Case Study: Khuzestan Regional Electric Company

Amini

Naderi

rad³

et al. 2022

IJRTEI

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Resonance and ferroresonance in power systems are categorized as two destructive phenomena especially in HV networks which their occurrence are being initiated in consequence of a power system event. Hence, the study of resonance and ferroresonance requires an exhaustive evaluation of possible network events in different network configurations. In each event, the analysis of network voltages is conducted based on identified allowable limits by IEEE 519 standard as evaluation critera. In this paper, a novel comprehensive study approach is used for resonance and ferroresonance phenomena study in a real power system (KzREC). The utilized approach comprises different steps including substation equipment modeling, EMT simulation of the probable switching events, evaluation of correspondence results, and finally detecting the probable ferroresonance occurrence. Furthermore, voltage and current limits are implemented to define impedance criteria for performing resonance evaluation of network buses. In this paper, the detailed evaluation results of a 230 kV substation (Andimeshk) are presented as an example substation. By performing the proposed evaluations, the probable condition which may lead to resonance and ferroresonance occurrence are identified. The results are highly valuable for network operators in the prevention of unintended overvoltages occurrencesubstation.

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“…If the oscillating frequency of the external overvoltage surge is close to the resonance frequency of the transformer winding, internal transformer resonance occurs resulting in high frequency overvoltages with maximum value. Therefore, external transients occurring in power systems might trigger internal transformer resonance, which causes high frequency transient overvoltages leading to insulation breakdown for transformer winding [1][2][3][4][5][6][7][8][9][10][11]. Shunt capacitor banks are installed in high voltage and extra high voltage systems to achieve economic saving.…”

Section: Introductionmentioning

confidence: 99%

Internal Resonance for Power Transformer Interacted With Cable Transients

Nassar¹,

Taalab²,

Izzularab³

et al. 2019

Yanbu Journal of Engineering and Science

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Power transformers may be subjected to switching surges or fault events that may be responsible for internal transformer resonance. This paper deals with two scenarios of cable-transformer resonance. The first resonance case is due to single-phase earth fault, the second resonance is due to capacitor energization. These two situations lead to excessive transient overvoltages in the secondary side of the power transformer. The effect of various factors on these transient overvoltages is studied. The study is performed on three-phase 155 MVA power transformer. Fast Fourier transform is used for analysis and defining resonance frequencies. Also, phase-plane diagram and discrete wavelet transform are used for internal resonance feature extraction. The results confirm overvoltage occurrence on the low voltage side of power transformer behind cable due to cable-transformer resonance.

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Resonant behavior of EHV transformer windings under system originated oscillatory transient over voltages

Cited by 12 publications

References 13 publications

Sobretensiones en Arrancadores con Autotransformador Causadas por la Desconexión del Interruptor Principal en el Arranque de los Motores

Sobretensiones en Arrancadores con Autotransformador Causadas por la Desconexión del Interruptor Principal en el Arranque de los Motores

A Comprehensive Study Approach for Evaluation of Resonance and Ferro-Resonance in HV Substations A Case Study: Khuzestan Regional Electric Company

Internal Resonance for Power Transformer Interacted With Cable Transients

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