Yutthagowith, Peerawut
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Yutthagowith, Peerawut
Alternative Name
Yutthagowith, P.
Yutthagowith, Pearawut
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peerawut.yu@kmitl.ac.th
24 results
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Item type:Publication, Computer aided-program for validation of measuring system from unit step response by time convolution method(2005-01-01); ; ; Phoomvuthisarn, S.This paper presents the design and development of the computer algorithm based on LabVIEW for verification of a high voltage measuring system. The algorithm consists of two parts. The first part is a program for calculating the parameters of unit step responses which are verified an ability of the measuring system by a comparison with the values given in IEC 60060-2. The second part is a program for calculating the output voltage waveform by time convolutions between standard testing waveforms and unit step responses. The standard waveforms under investigation are full lightning impulse voltage waveforms, tail-chopped lightning impulse voltage waveforms, front-chopped lightning impulse voltage waveforms and steep-front voltage waveforms according to IEC standards 60060-2 and 61211. This paper considers two different types of the measuring systems, with a resistive voltage divider and a damped capacitive voltage divider for testings. The results show that the algorithm proposed in this paper is practicable, and should be a useful tool for impulse voltage measurements in a standard high voltage laboratory. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Transient equivalent circuit of a horizontal grounding electrode(2012-12-31); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Fast and Effective Technique in Evaluation of Lightning Impulse Voltage Parameters(2021-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Partial Discharge Measurement Based on an Inductive Mode Air-Core Sensor(2020-03-01); In this paper, an alternative technique for partial discharge (PD) measurement using an air-core sensor is proposed. The air-core sensor consists of an inductive mode air-core coil and the appropriate additional resistor. The approach for inductive mode enhancement of an air-core coil is presented. In the inductive mode operation, an output voltage which is proportional to an induced voltage from the air-core coil is utilized to determine PD currents and charges by a numerical integration. In the design process of the air-core sensor, parameter estimation with a computation algorithm is employed for extracting unknown circuit parameters of the air-core coil from a unit step response. These estimated parameters are crucial in an effective design of the PD measuring system. With the design circuit parameters, experiments in PD measurement were performed. From experimental results, the developed system has promising performance, and the sensitivity is in the range of a few picocoulombs. From this achievement, the proposed technique is a choice in PD measurement for high-voltage equipment in the laboratory and in the on-site measurement. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effective simulation approach for lightning impulse voltage tests of reactor and transformer windings(2020-10-16); In this paper, an effective simulation method for lightning impulse voltage tests of reactor and transformer windings is presented. The method is started from the determination of the realized equivalent circuit of the considered winding in the wide frequency range from 10 Hz to 10 MHz. From the determined equivalent circuit and with the use of the circuit simulator, the circuit parameters in the impulse generator circuit are adjusted to obtain the waveform parameters according to the standard requirement. The realized equivalent circuits of windings for impulse voltage tests have been identified. The identification approach starts from equivalent circuit determination based on a vector fitting algorithm. However, the vector fitting algorithm with the equivalent circuit extraction is not guaranteed to obtain the realized equivalent circuit. From the equivalent circuit, it is possible that there are some negative parameters of resistance, inductance, and capacitance. Using such circuit parameters from the vector fitting approach as the beginning circuit parameters, a genetic algorithm is employed for searching equivalent circuit parameters with the constraints of positive values. The realized equivalent circuits of the windings can be determined. The validity of the combined algorithm is confirmed by comparison of the simulated results by the determined circuit model and the experimental results, and good agreement is observed. The proposed approach is very useful in lightning impulse tests on the reactor and transformer windings. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Study of a partial discharge location technique for power cables using high frequency current transducer(2018-11-01); ; Pumyoy, SuparatIn this paper, a partial discharge location technique for power cables was studied. PD signals are measured by high frequency current transducer which has been experimentally verified and installed at the end one (near end) of cable. The standard PD pulse calibrator with the charge of 200 pC was used to investigate the PD location at various position along the cable with total length is 37.925 m. The PD location method, time domain reflectometry (TDR) is used to locate the PD defect along the cable, which essentially based on the f travelling wave theory. From the experimental results of PD location, the highest error of PD location by time domain reflectometry method is 0.859 % at PD defect point (x) of 21.41 m. From this experiment, the proposed technique can be applied to further practical application and research related to PD location. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Implementation of a Rogowski's coil for partial discharge detection(2017-01-30); This paper presents the implementation of a Rogowski's coil for a special purpose on partial discharge detection. A numerical integrator and a filter are used with the Rogowski's coil to calculate partial discharge current and apparent charge. Implementation of the Rogowski's coil in a laboratory, such as a unit step response, linearity of the measurement, and partial discharge detection, is performed. It is found that the partial discharge current and the apparent charge which are detected by the Rogowski's coil are agreed well with the measurement from the conventional method. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Applications of a high frequency current transformer and air-core inductive devices for detecting a partial discharge location in a cable(2020-01-01); This paper presents applications of partial discharge sensing devices for detecting a partial discharge location in a cable. Three devices are under investigated. The first type is a high frequency current transformer (HFCT), while other two types are air core inductive devices with different configuration. The high frequency current transformer is constructed from a ferromagnetic material core, and the winding conductor is in a single compensation form. The first air core inductive device is wound in a single compensation pattern, and uses the return winding in the form of a copper sheet. The second air core inductive device, differently, is in a counter wound compensation pattern. In experiments, a partial discharge sensing device is installed at one end of the cable. The standard pulse calibrator is employed to inject partial discharge pulses at the designated locations along the cable. The Time Domain Reflectometry technique (TDR), which is based on the travelling wave theory, is employed in calculating the partial discharge locations. It is found that these three current transducers can detect the partial discharge pulses, and with the algorithm, which is developed using the Time Domain Reflectometry, the partial discharge location along the cable can be identified accurately. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Analysis of frequency converters for PD test(2017-10-27); ; Potivejkul, SiriwatThis paper presents the analysis of an AC-AC converter used in partial discharge test. In this paper, the analysis of the frequency converter is separated into two parts. Firstly, the converter models are simulated by a circuit simulation program for comparing noise signals generated by the 2-level SFC and 5-level SFC. The frequency of the converter was set to be 200 Hz. With the help of the simulator, the approach for noise mitigation with filter application is designed and applied to the PD test system. In the second part, the developed static frequency converters are used in the partial discharge tests for confirming the simulation results. From all simulated and experimental results, it can be concluded that the 5-level SFC has high efficiency, low generated noise signal, and also very attractive for using in partial discharge test. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design of counterpoise grounding electrodes for transmission towers in high soil resistivity area(2018-10-23); This paper presents an approach based on numerical electromagnetic analysis for design of counterpoise grounding electrodes for transmission towers in high soil resistivity area. Frequency dependent soil parameter impulse characteristics of counterpoise electrodes are taken into account in the design process. The transient characteristics of the counterpoise electrodes calculated by a representative electromagnetic approach named the partial element equivalent circuit (PEEC) method are presented in the time and frequency domains. In cases of the time domain simulation, the standard lightning impulse current waveforms collected from IEC 62305 are taken into account. The soil ionization is neglected for the conservative cases. It is noticed that in cases of long counterpoise electrodes, the capacitive effect at the middle frequency range is found. This effect leads to the magnitude of the electrode impedance to be lower than its resistance. Neglecting frequency dependence of soil parameters, the impulse grounding resistance (impedance) of the 4-leg grounding electrode in the high resistivity soil area cannot be achieved to the specified utility's value of 20 Ω due to effect of impulse effective length. However, when the frequency dependence of soil parameters is included in the design, the grounding resistance can be achieved to the specified utility's value. Therefore, the grounding resistance of 20 Ω is still possible for the grounding system design according to the utility's requirement.