Kunakorn, Anantawat
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Preferred name
Kunakorn, Anantawat
Alternative Name
Kunakorn, A.
Kunakorn, Anatawat
Main Affiliation
Email
anantawat.ku@kmitl.ac.th
4 results
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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, 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, 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);