Kunakorn, Anantawat
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Preferred name
Kunakorn, Anantawat
Alternative Name
Kunakorn, A.
Kunakorn, Anatawat
Main Affiliation
Email
anantawat.ku@kmitl.ac.th
9 results
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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, 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, An algorithm for circuit parameter identification in lightning impulse voltage generation for low-inductance loads(2020-08-01); This paper presents an effective technique based on an artificial neural network algorithm utilized for circuit parameter identification in lightning impulse generation for low inductance loads such as low voltage windings of a power transformer, a large distribution transformer and an air core reactor. The limitation of the combination between Glaninger’s circuit and the circuit parameter selection from Feser’s suggestions in term of producing an impulse waveform to be compliant with standard requirements when working with a low inductance load is discussed. In Feser’s approach, the circuit parameters of the generation circuit need to be further adjusted to obtain the waveform compliant with the standard requirement. In this process, trial and error approaches based on test engineers’ experience are employed in the circuit parameter selection. To avoid the unintentional damage from electrical field stress during the voltage waveform adjustment process, circuit simulators, such as Pspice and EMTP/ATP, are very useful to examine the generated voltage waveform before the experiments on the test object are carried out. In this paper, a system parameter identification based on an artificial neural network algorithm is applied to determine the appropriate circuit parameters in the test circuit. This impulse voltage generation with the selected circuit parameters was verified by simulations and an experiment. It was found that the generation circuit gives satisfactory impulse voltage waveforms in accordance with the standard requirement for the maximum charging capacitance of 10 µF and the load inductance from 400 µH to 4 mH. From the simulation and experimental results of all cases, the approach proposed in this paper is useful for test engineers in selection of appropriate circuit components for impulse voltage tests with low inductance loads instead of employing conventional trial and error in circuit component selection. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Accurate Assessment of Moisture Content and Degree of Polymerization in Power Transformers via Dielectric Response Sensing(2023-10-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Systematic design and circuit analysis of lightning impulse voltage generation on low-inductance loads(2021-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Frequency response characteristics of rogowskilightningcoil withmeasurementactive integrator for(2020-02-28); ; Yamamoto, KazuoThis paper presents frequency response characteristics of a Rogowski coil which is developed with an active integrator. Experiments are performed in a laboratory with a frequency function generator as a source. The frequency responses of the Rogowski coil and the integrator are recorded with both magnitude and phase in order to verify the capability in measur-ing lightning current waveshapes. For availability in lightning current measurement in the electrical sys-tem, the developed Rogowski coil is specifically de-signed as a clamp on device. The standard lightning current waveshape of the positive first stroke impulse (10/350 µs) is simulated to investigate the measur-ing system. It is found that the frequency bandwidth of the Rogowski coil with the integrator developed in this paper is proper in lightning current measure-ment. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effective design of a two-stage surge protective device for AC low voltage system protection(2024-01-01);