Initiation of Characteristic Ferroresonance States Based on Flux Reflection Model

Miličević, Kruno; Emin, Z.

doi:10.1109/tcsii.2012.2234897

Cited by 20 publications

(17 citation statements)

References 12 publications

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“…As shown already in [10], with increasing coil nominal voltage, UN, subharmonic steady states occur at higher values of RMS source voltage Urms, due to the increased excitation required to drive the coil into saturation. Furthermore, initial conditions have a stronger impact with increasing capacitance C due to the capability of the capacitor to store more electrostatic energy for the same RMS source voltage, Urms, during a particular steady-state type.…”

Section: Resultssupporting

confidence: 56%

“…Chua's model shown in Fig. 1 is the favoured model in ferroresonance research [1][2][3][4][5][8][9][10] and in electrical engineering in general, because it is built using basic elements defined by circuit theory [11]. However, the circuit theory does not take into an account the geometry of components which could be analysed using statistical methods as presented in [12].…”

Section: Introductionmentioning

confidence: 99%

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Chua’s model of nonlinear coil in a ferroresonant circuit obtained using Dommel’s method and grey box modelling approach

2016

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Chua's model of the nonlinear coil is often used in ferroresonance research. In this paper, two methods are used to determine such a model: usual Dommel's method and a grey box modelling approach, which is a novel way to model the nonlinear coil in a ferroresonant circuit. The parameters of the grey box model are determined by nonlinear regression using a metaheuristic optimization algorithm. The obtained models are evaluated by comparing the steady-state types obtained by measurements with those obtained using simulation. Comparing the obtained Chua's models, results indicate that the grey box modelling approach is more accurate than Dommel's method for lower coil nominal voltage. However, the main conclusion is that Chua's model in general cannot be used to predict all steady-state types typical for ferroresonance, i.e. it can be used in a highly restricted manner for appearance of certain steady-state types only.

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Section: Resultssupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Chua’s model of nonlinear coil in a ferroresonant circuit obtained using Dommel’s method and grey box modelling approach

2016

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“…Pengujian inisiasi feroresonansi telah dilakukan pada transformator tegangan rendah satu fase dengan inti toroid dan jenis material M5 [19]. Variasi tegangan sumber dilakukan dengan menaikkan tegangan secara bertahap dan kontinu hingga mencapai sekitar dua kali dari tegangan nominal transformator.…”

Section: Pendahuluanunclassified

Analisis Karakteristik Arus dan Tegangan pada Inisiasi Feroresonansi Transformator Tegangan Rendah

Hernanda¹,

Negara²,

Soeprijanto³

et al. 2018

Jurnal Nasional Teknik Elektro dan Teknologi Informasi (JNTETI)

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Ferroresonance is an interaction phenomenon between non-linear inductance and capacitance that initiates abnormal waveform of current and voltage. This phenomenon is very sensitive to system parameter and initial condition. In this paper, ferroresonance initiation involved a basic circuit of series ferroresonance with variation of source voltage magnitude on a single phase low voltage transformer. The scheme of experiment was based on the case of transformer energizing. The trends of current and voltage waveform on the primary windings were investigated and transformed by using Fast Fourier Transform (FFT). The harmonics spectrum was then employed to identify the feroresonance mode and calculate the Total Harmonics Distortion (THD) of current and voltage. The experimental results showed that the higher source voltage magnitude caused the ferroresonance responses to be seen more clearly. It was indicated by the more distorted waveform, the higher odd harmonics frequency amplitude especially for 150 Hz, and the greater THD. Based on the harmonics spectrum and wave period, the ferroresonance responses were identified as fundamental mode. The effects of initial conditions, such as residual flux of transformer and capacitor charge, were also seen on the distorted wave peak during transient condition. In addition, the difference of waveform between normal and ferroresonance condition could be more easily observed on the voltage than the current. The waveforms of current and voltage during experiment had been verified by using simulation.

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“…The resistance of a primary harmonic elimination device of 10 kV and below is above 60 kΩ, and the resistance value of 35 kV primary harmonic elimination device is above 150 kΩ. At present, many suppression measures [5][6][7][8][9][10][11][12] have been proposed based on the mechanism of ferromagnetic resonance [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

On-Line Detection of Voltage Transformer Insulation Defects Using the Low-Frequency Oscillation Amplitude and Duration of a Zero Sequence Voltage

Liu¹,

Wang²,

Yang

et al. 2019

Energies

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The insulation degradation of a voltage transformer winding is not easy to find, but it may ultimately cause the transformer to explode, leading to accidents such as phase-to-phase short circuits. At present, power transformers, lightning arresters, and other equipment have on-line methods to detect the insulation state. However, there is no mature method for the on-line monitoring of voltage transformer winding insulation. In this study, a small current disturbance method based on a zero-sequence loop is proposed. The characteristic parameters of the low-frequency oscillation of zero-sequence voltage after a disturbance are used to evaluate the insulation state of the winding and detect faults. Theoretical modeling, simulation tests, and field tests show that when the insulation resistance of the voltage transformer winding is in the range 0–40 kΩ, a low frequency oscillation of about 10 Hz can be detected on the zero-sequence voltage, and its amplitude and duration are proportional to the degree of damage to the insulation. This can hence be used as a criterion for the on-line detection of voltage transformer winding insulation defects.

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Initiation of Characteristic Ferroresonance States Based on Flux Reflection Model

Cited by 20 publications

References 12 publications

Chua’s model of nonlinear coil in a ferroresonant circuit obtained using Dommel’s method and grey box modelling approach

Chua’s model of nonlinear coil in a ferroresonant circuit obtained using Dommel’s method and grey box modelling approach

Analisis Karakteristik Arus dan Tegangan pada Inisiasi Feroresonansi Transformator Tegangan Rendah

On-Line Detection of Voltage Transformer Insulation Defects Using the Low-Frequency Oscillation Amplitude and Duration of a Zero Sequence Voltage

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