Yutthagowith, Peerawut

Preferred name

Alternative Name

Yutthagowith, P.

Yutthagowith, Pearawut

Main Affiliation

School of Engineering

peerawut.yu@kmitl.ac.th

Now showing 1 - 10 of 10

Some of the metrics are blocked by your
consent settings
Application of a partial element equivalent circuit method to lightning surge analyses
(2013-01-01)
Yutthagowith, Peerawut
;
Ametani, Akihiro
;
Rachidi, Farhad
;
Nagaoka, Naoto
;
Baba, Yoshihiro
This paper presents the application of the partial element equivalent circuit (PEEC) method in the time and frequency domains for calculating tower surge responses and insulator voltages of an actual transmission tower, and transient performance of grounding systems. Neglecting of electromagnetic retardation effect in the PEEC method in the time domain is proposed to increase efficiency of the method. Incorporation of nonlinear elements such as a flashover model and a soil ionization model with the PEEC method in the time domain is presented. Moreover, an effective way to increase the efficiency of the method in terms of computation time, which consists of the appropriate combination of the PEEC method and the transmission line theory, is proposed. The transmission line model is adapted to combine with the method for reducing elements in the PEEC method. Comparisons of the simulation results by the proposed methods in the time and frequency domains with other numerical methods and with available experimental data show satisfactory agreement. © 2012 Elsevier B.V. All rights reserved.
Some of the metrics are blocked by your
consent settings
A Simple Mathematical Expression for Nonlinear Resistive Characteristics of Metal Oxide Elements in Lightning Surge Analysis
(2025-06-01)
Yutthagowith, Peerawut
;
Baba, Yoshihiro
Accurate simulations of transient phenomena in electric power systems with metal oxide varistors (MOVs) or lightning arresters (LAs) using the finite-difference time-domain (FDTD) method for solving Maxwell's equations require simple and accurate representations of MOVs or LAs. By representing a small cell within a MOV or LA with resistivity (ρ) dependent on electric field (E), these components can be modeled in three dimensions and seamlessly integrated into FDTD simulations. Achieving computational efficiency in FDTD simulation necessitates avoiding iterative computations for ρ from E. Hence, there is a significant need for a simple and accurate mathematical expression of ρ in terms of E. This study presents a methodology for deriving a three-coefficient exponential function from experimental data. By using integration properties, this method transforms nonlinear characteristics into linear ones without iterative processes or uniform data sampling. It also incorporates data weighting and outlier discrimination for enhanced accuracy. Comparative analysis with previous methods based on the ordinary least squares method and experimental data, using an applied current with a rise time of approximately 8 μs, confirms high accuracy and effectiveness in computing residual voltages resulting from impulse current injection using the FDTD method.
Some of the metrics are blocked by your
consent settings
PEEC simulation of lightning over-voltage surge with corona discharges on the over head wires
(2020-03-01)
Yutthagowith, Peerawut
;
Tran, Thang H.
;
Baba, Yoshihiro
;
Ametani, Akihiro
;
Rakov, Vladimir A.
In this paper, a simplified corona discharge model is adopted with a partial element equivalent circuit (PEEC) method in the time domain for simulation of lightning over-voltage surge. Effects of corona discharge to the voltage distortion and the electromagnetic coupling of the overhead wires are presented. In addition, the effect on the voltage measuring system to the induced voltage on its nearby parallel wire is presented and discussed. The corona progression from an overhead wire, to which a high voltage impulse is applied, is represented by the radial expansion of the conducting region. Undesired oscillations of the computed waveforms found in the authors’ previous paper have been discarded by iteration process for calculation of the corona radius and the voltage of each PEEC element at each calculated time step. To confirm the validity of the presented model with the PEEC method, the calculated results are compared with experimental results. The calculated results agree well with the corresponding experimental ones. This shows that the PEEC method in the time domain with the corona model is of use in simulations of lightning surges propagating along overhead wires.
Some of the metrics are blocked by your
consent settings
Application of a partial element equivalent circuit method to lightning surge analyses
(2011-12-01)
Yutthagowith, Peerawut
;
Ametani, Akihiro
;
Nagaoka, Naoto
;
Baba, Yoshihiro
This paper presents the application of the partial element equivalent circuit (PEEC) method in the time and frequency domains for calculating voltages across insulators on an actual transmission tower and ground potential rise on grounding electrodes. An effective way to increase the efficiency of the method in terms of computation time, which consists of the appropriate combination of the PEEC method and the transmission line theory, is proposed. The transmission line model is adapted to combine with the method for reducing elements in the PEEC method. Comparisons of the simulation results by the proposed methods in the time and frequency domains with other numerical methods and with available experimental data show satisfactory agreement. © 2011 IEEE.
Some of the metrics are blocked by your
consent settings
Error Correction Model of Lightning Impulse Voltage Using Deconvolution Techniques
(2024-01-01)
Yutthagowith, Peerawut
;
Pongpitak, Virat
;
Baba, Yoshihiro
In this paper, techniques based on deconvolution alongside the unit step response of a measuring system are utilized to correct lightning impulse voltage used in high-voltage withstand tests. A mathematical derivation of the techniques is presented and employed to mitigate the non-ideal influences of measuring instruments on recorded data. To mitigate the impact of undesired high-frequency noise associated with deconvolution, the transfer function of the error correction model is determined by fitting parameters derived from the unit step response of the measuring system under consideration. Additionally, a low-pass filter with an appropriate cut-off frequency is applied alongside the error correction model. The efficacy of this approach is illustrated through a practical example involving a measuring system. The effectiveness of the proposed techniques was evaluated through comparison with results obtained from a reference measuring system. The evaluated results indicate that the step response correction in the proposed techniques can significantly reduce the errors of lightning impulse voltage waveform parameters.
Some of the metrics are blocked by your
consent settings
Development of a Simple Dielectric Equivalent Circuit Model from Polarization and Depolarization Current Measurements
(2024-01-01)
Yutthagowith, Peerawut
;
Nimsanong, Phethai
;
Baba, Yoshihiro
Assessing insulation performance is vital for sustainable energy systems, which aim to minimize visual impact while ensuring reliability and resilience against weather-related disruptions. With increasing reliance on renewable energy sources, the importance of insulation performance becomes even more pronounced. Regular evaluations of insulation performance are critical for maintaining the safety, reliability, and resilience of electricity networks. By promptly identifying risks such as insulation degradation, utilities can improve maintenance practices, prioritize repairs, and enhance the integration of renewables, thereby boosting overall infrastructure performance. This paper introduces a straightforward and precise technique for determining the equivalent circuit parameters of insulation systems in high-voltage equipment. The proposed method facilitates the accurate determination of the dielectric loss factor from the equivalent circuit. To validate this approach, test cases were utilized to demonstrate its effectiveness. The results obtained through this method were then compared with those obtained using commercial software. The comparison reveals that the proposed approach results in a lower number of depolarization current branches compared to the commercial software. Also, it provides almost the same relative root mean square error and the lower root mean square relative error of the depolarization current. These findings underscore the appeal and effectiveness of the proposed method for determining the equivalent circuit of the dielectric model.
Some of the metrics are blocked by your
consent settings
Application of a simplified corona discharge model to a lightning surge simulation with the PEEC method
(2018-10-23)
Yutthagowith, Peerawut
;
Tran, Thang H.
;
Ametani, Akihiro
;
Baba, Yoshihiro
;
Rakov, Vladimir A.
In this paper, a simplified corona discharge model is adopted in a surge simulation with a partial element equivalent circuit (PEEC) method in the time domain. The corona progression from an overhead wire, to which a high voltage impulse is applied, is represented by the radial expansion of the conducting region with a conductivity of 40 μS/m. To confirm the validity of the presented model with the PEEC method, the calculated results are compared with experimental results collected from Noda's experiments. The calculated results agree well with the corresponding experimental ones. This shows that the PEEC method in the time domain with the corona model is of use in simulations of lightning surges propagating along overhead wires.
Some of the metrics are blocked by your
consent settings
Accurate Mathematical Parameter Determination for Two-Exponential Lightning Impulse Waveforms with Specified Parameters
(2024-01-01)
Yutthagowith, Peerawut
;
Baba, Yoshihiro
Standard lightning impulse voltage waveform is commonly described mathematically using a two-exponential function. In practical applications, waveform parameters such as front time, time to half, and peak voltage of the impulse need to be translated into mathematical parameters (time constants and peak factor) of the function, and vice versa. This paper introduces a method called the time normalization technique for accurately estimating the mathematical function parameters of lightning impulse voltage while considering specified waveform parameters. Validation of the proposed method demonstrates that the overall error in estimation is below 0.1%. Additionally, the paper discusses the utilization of the obtained waveform to assess the uncertainty of a measuring system.
Some of the metrics are blocked by your
consent settings
Accurate Mathematical Parameter Determination for Double-Exponential Impulse Waveforms with Specified Parameters
(2024-01-01)
Yutthagowith, Peerawut
;
Baba, Yoshihiro
A double-real-exponential function is extensively utilized in high-power electromagnetics, encompassing research on high-altitude electromagnetic and ultrawide-band pulses, lightning, and high-voltage tests. There is a substantial demand for converting pulse waveform parameters such as rise time, full width at half maximum, fall time, front time, time to peak, time to half peak, and peak value into the first- and second-time constants and a peak factor of a mathematical function. The article introduces an accurate method named the time normalization technique for mathematically generating impulse waveforms with a set of waveform parameters, including: the rise time, the full width at half maximum, and the peak value and the front time, the time to half peak, and the peak value. The validation of the proposed method reveals that estimation errors below 10-6% can be achieved. Using the results obtained from this method, expressions for mathematical parameter estimation in a wide range of time parameters are developed, which yields estimation errors below 0.02% for converting the rise time, the full width at half maximum, and the peak value to the first- and second-time constants and the peak factor, and below 0.01% for converting the front time, the time to half peak, and the peak value to the first- and second-time constants and the peak factor. Additionally, the utilization of these expressions for waveform generation to evaluate the measurement uncertainty of a voltage measuring system is demonstrated.
Some of the metrics are blocked by your
consent settings
An Effective Approximate Mathematical Expression for Non-Linear Resistance Characteristics of Metal Oxide Elements
(2025-06-01)
Yutthagowith, Peerawut
;
Baba, Yoshihiro
A metal oxide varistor (MOV), manufactured from a blend of zinc oxide and other metal oxides, undergoes changes in resistance or resistivity depending on changes in applied voltage or electric field strength. Typically, the nonlinear resistive characteristics of MOV elements are determined through experimental measurements of voltage and current. This article introduces a mathematical expression comprising two power functions and a constant term with five adjustable coefficients. It is utilized to describe the voltage-current or electric field-current density characteristics across a wide range of current or current density, spanning from microamperes to several tens of kiloamperes or from several hundred A/m2 to a few hundred of kA/m2, respectively. This expression accurately reproduces the observed nonlinear resistive behaviors of several low-voltage MOV elements. A noniterative fitting method is developed to determine the expression’s five coefficients, using integration to linearize nonlinear characteristics without requiring iterations or uniform data sampling. Through comparison with a previously proposed expression and experimental data, the proposed technique demonstrates remarkably high accuracy. Furthermore, the proposed technique is applied to accurately estimate the parasitic inductance of an MOV and its lead wires during a residual voltage test conducted with an 8/20-microsecond impulse current.
1

Yutthagowith, Peerawut

Filters

Settings

Sort By

Results per page