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Development of artificial-intelligence vision system for measurement on-service train for train-track inspection
(2020-01-01)
Saenthon, Anakkapon
;
Kiatwanidvilai, Somyot
;
Pumyoy, Suparat
We studied and inspected the evaluation of safety during the operation of a rail system. In addition, in order to find patterns in the interaction between wheels and rails, the interaction is investigated using an automatic vision system to analyze the patterns that occur. The model of a faster region with a convolutional neural network (R-CNN) can be used to design artificial intelligence (AI) models with vision systems for detecting abnormal operations that occur, causing rail accidents, and to monitor the measurement of tracks and interactions between wheels and tracks in real time.
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Study of a partial discharge location technique for power cables using high frequency current transducer
(2018-11-01)
Paophan, Busayapol
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Kunakorn, Anantawat
;
Yutthagowith, Peerawut
;
Pumyoy, Suparat
In 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.
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Design and analysis of coupling device in partial discharge detection
(2017-10-27)
Marukatat, Nattapon
;
Kunakorn, Anantawat
;
Yutthagowith, Peerawut
;
Pumyoy, Suparat
This paper presents design and analysis of a coupling device which is used for measurement of PD signal and AC voltage as the conventional partial discharge testing according to IEC 60270. The remarkable feature of the developed coupling device is the accuracy in PD signal measuring and the ability in eliminating noise signal Therefore, In the AC signal measuring part, the proper impedance was chosen to achieve appropriate voltage divide ratio and accuracy in PD signal measuring. In PD signal measuring part, the value of the components must be chosen properly to achieve the determined Upper and Lower limit frequency. In this part, noise signal elimination must be considered to gain less effect to PD signal, otherwise the PD signal waveform will distort. From intensive study, three different coupling device circuits were designed and constructed. The circuit of the first and second coupling device are collected from literatures. It is found that the PD signal was interfered by the testing AC voltage signal. Therefore, the last one was developed to overcome this problem. The last developed coupling device has the lower and the upper cut off frequencies of 30 kHz and 20 MHz, respectively. The results of the three coupling devices are compared to that of the commercial coupling device in the HV laboratory of King Mongkut's Institute of Technology Ladkrabang. The developed coupling devices can be used in conventional PD testing according to IEC 60270. The comparisons of the simulated and experimental results show that the performance of the developed coupling devices as same as the commercial one.

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