Effective Technique for Circuit and Waveform Parameter Extraction in Impulse Current Tests and Its Application

Yutthagowith, Peerawut

doi:10.1109/tpwrd.2015.2459069

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…As has been mentioned, the depolarization current can be written in the form of the sum of exponential functions. Several techniques [22][23][24] for fitting the sum of exponential functions have been proposed, but there are some restrictions in terms of computational accuracy, efficiency, and stability. Therefore, two simple and effective techniques for fitting the depolarization current are presented in the following subsections.…”

Section: Proposed Techniques For Determining the Dielectric Model Par...mentioning

confidence: 99%

Determination of Dielectric Models Based on Effective Multi-Exponential Fittings

Raxsa,

Nimsanong,

Mai-Eiam

et al. 2023

Energies

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In high-voltage (HV) transmission and distribution systems, HV apparatuses are subjected to electrical, thermal, and mechanical stresses that deteriorate the insulation performance. The polarization and depolarization current (PDC) measurement is an effective tool used for evaluating insulation performances. The depolarization current represented by the summation of the discharge currents with the different time constants can be utilized for the development of the dielectric model based on the extended Debye’s model (EDM). This paper presents effective techniques for determining the dielectric model. Iterative approaches with predetermination of the time constants and least squares methods (either linear ordinary or percentage ones) were utilized to fit the depolarization current in the form of multi-exponential functions. The fitting parameters determined by the proposed method with the linear ordinary least squares (OLLS) method and provided by commercial software agree very well only in the high current and beginning range. Application of the linear percentage least squares (PLLS) method shows better accuracy than that of the OLLS method, and the deviation from the measured one in the low current range and the late measuring time were reduced significantly. The fitted current by this proposed technique with the PLLS method agrees well with the measured current throughout the whole recording time, even in the low current and late time range. From the accurately fitted currents, the dielectric model and the dielectric loss factors can be determined precisely, and the insulation condition of HV equipment can be evaluated properly.

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Section: Proposed Techniques For Determining the Dielectric Model Par...mentioning

confidence: 99%

Determination of Dielectric Models Based on Effective Multi-Exponential Fittings

Raxsa,

Nimsanong,

Mai-Eiam

et al. 2023

Energies

Self Cite

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Estimation of Stray Parameters in Lightning Impulse Voltage Generation Circuit

Termtachatipongsa,

Yutthagowith

2023

2023 12th Asia-Pacific International Conference on Lightning (APL)

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A Simplified Model of a Surge Arrester and Its Application in Residual Voltage Tests

2021

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A simplified and accurate model of a surge arrester used in the residual voltage test is proposed in this paper. With the help of a genetic algorithm, the measured impulse current and residual voltage waveforms are utilized to determine circuit parameters of the proposed model and the generation circuit precisely. The technique starts from the circuit parameter determination using the preliminary experimental data with a lower current peak than that specified by the standard. From the determined model and with the help of the genetic algorithm, the circuit parameters and the charging voltage to obtain the specified current peak and the residual voltage can be estimated accurately. The validity of the proposed technique has been verified by experiments for the estimation of the appropriate current circuit parameters, the charging voltage, and the residual voltage. In addition, the application of the proposed model in the residual voltage tests is presented. From comparison of simulated and experimental results with the determined parameters, the impulse current and residual voltage waveforms are determined precisely. It is confirmed that the proposed model and technique are attractive in the appropriate circuit parameter determination and the residual voltage estimation in the residual voltage tests of surge arresters. The proposed method also provides a good advantage for reduction of the number of trial and error experiments for obtaining the current waveform according to the standard requirement. Moreover, the unintentional damages of the arrester during the process of the waveform adjustment will be reduced significantly.

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Effective Technique for Circuit and Waveform Parameter Extraction in Impulse Current Tests and Its Application

Cited by 3 publications

References 7 publications

Determination of Dielectric Models Based on Effective Multi-Exponential Fittings

Determination of Dielectric Models Based on Effective Multi-Exponential Fittings

Estimation of Stray Parameters in Lightning Impulse Voltage Generation Circuit

A Simplified Model of a Surge Arrester and Its Application in Residual Voltage Tests

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