Tiengthong, Thanadol

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Tiengthong, Thanadol
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thanadol.ti@kmitl.ac.th

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    Item type:Publication,
    Characterization of Electromagnetic Wave Propagation in Transformer for PD Detection Analysis
    (2022-01-01)
    Tiengthong, Thanadol
    ;
    Jaya Marindra, Adi Mahmud
    ;
    Pattanadech, Norasage
    ;
    Promwong, Sathaporn
    The characterization of transformer wall effects a big problem regarding to the partial discharge, which caused substantial business losses and partial discharge analysis. Previously, there were methods of examination and evaluation using ultrasonic and acoustic waves, for this thesis saw the importance of having studied and done. Test the transmission of electromagnetic waves in a power transformer. The vector network analyzer was used to measure and record the results. A microstrip patch antenna was used to evaluate the experimental measurements on the designed transformer wall at different locations. The results obtained from the experiments will be analyzed, evaluated, and compared to the transfer function of the electromagnetic wave in the transformer. Considering the transfer function, power delay profile, and path loss, in the cases of no obstruction and obstruction from the evaluation and comparative consideration. Studies and experiments show that the data obtained measuring electromagnetic wave characteristics in transformers are guidelines in the study and analysis of partial discharges in the transformer. And primary data for the future analysis of partial discharges in the transformer.
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    Item type:Publication,
    Experimental evaluation scheme of DTTV propagation loss in Thailand
    (2019-07-01)
    Promwong, Sathaporn
    ;
    Tiengthong, Thanadol
    ;
    Chaisang, Aditep
    ;
    Rangsanseri, Yuttapong
    Digital terrestrial television (DTTV) propagation loss should be known characteristics of DTTV propagation channels. In Thailand used DVB-T2 standard for broadcast television channel which shell be study. DTTV propagation loss based in measurement data with system design and analysis of DTTV parameters are importance. In order to predict the result of the broadcast of DVB-T2 in Pathumthani, Thailand, the Hata propagation model is used as the calibration and optimization method for the measurement results. The measurement of the DVB-T2 signal which broadcast from transmitted station are collect as the source of research data. Two broadcast channels were sampling as the broadcasting frequency in this research, i.e., 626 MHz (CH40) and 658 MHz (CH44). The separated distance between transmitted station and received antenna were in range of 2 km. to 7 km. The least square method is use as the optimized propagation model of DVB-T2 signal. The mean error and root mean square error are use as the statistical value for the calibrated model, while relative error is use to indicate the comparison of model component. In the DTTV propagation channel analysis, the root means square error and the optimized method of calibrated model has relative error higher than the calibrated model with mean error. From the results, it shows that the calibrated model of Hata propagation model with mean error is suitable for predict DTTV propagation loss in urban area of Thailand.
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