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    Effect of Gd2O3 on the radiation shielding, physical, optical and luminescence behaviors of Gd2O3–La2O3–ZnO–B2O3–Dy2O3 glasses
    (2021-08-01)
    Kaewjaeng, S.
    ;
    Wantana, N.
    ;
    Kothan, S.
    ;
    Rajaramakrishna, R.
    ;
    Kim, H. J.
    The present work focuses on lead-free glasses, their shielding behavior, and other optical studies. The glass composition with xGd<inf>2</inf>O<inf>3</inf>+10La<inf>2</inf>O<inf>3</inf>+10ZnO+(79-x) B<inf>2</inf>O<inf>3</inf>+1Dy<inf>2</inf>O<inf>3</inf>, x = 0, 5, 10, 15, 20 mol% were prepared to the characterization on physical, absorption spectra, photo-, radioluminescence, and radiation shielding properties. In the experimental results, the density of Gd-1Dy glass samples increases with the increase of Gd<sup>3+</sup> ions concentrations. The ten-strong peak in the 5Gd-1Dy glass of absorption spectra in UV–Vis–NIR regions. The white photoluminescence spectra base of Gd-1Dy glass samples can be generated under excitation at 351 nm makes the strongest emission of Dy<sup>3+</sup> ions and excitation through energy transfer from Gd<sup>3+</sup> in Gd-1Dy glass samples with 275 and 351 nm. This strong white emission of Dy<sup>3+</sup> ions also strong in x-ray luminescence and performs the integral scintillation efficiency of 33% when compared with BGO crystal. The radiation shielding properties in the diagnostic medicine energies region are correlated, the values of glass samples better than commercial windows, bricks, and concrete. The HVL values of glass sample at 15 and 20 mol% of Gd<inf>2</inf>O<inf>3</inf> has been found better than X-ray windows. The corollaries of Gd-1Dy glass samples can be a candidate for radiation detector and lead-free radiation shielding materials in future.
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    Remote monitoring and alert system of HV transformer based on FMEA
    (2020-12-01)
    Asadi, Farzin
    ;
    Phumpho, Satree
    ;
    Pongswatd, Sawai
    This paper presents a technique to measure and collect maintenance data for remote monitor of high voltage transformer. The technique installs field instruments to measure winding temperature, cooling-oil temperature, inner pressure, electrical power, and so on. IoT2040 is applied for acquisition (DAQ), processing unit and smart gateway. It converts field data into information that enables for real time monitoring and preventive maintenance applications. This technique can transform time-based maintenance to condition-based maintenance. In addition, the proposed script functions are created based on failure modes and effects analysis (FMEA) to identify alarm and alert conditions. Consideration alarm-referenced parameters that are diagnostic, performance/efficiency analysis relate to operation or communication conditions also assign by script functions. The relevant data from IoT2040 can be transmitted to the local computer as well as a remote-mobile devices running the dashboard with Ubidots server. Ubidots server is responsible for HMI and delivering specific alarm and alert services to the user. Users can access for remote monitoring by smart phone, tablet, laptop, and PC. The experiment performs by simulation with 3 phase Oil immersed distribution transformer. Electrical specification is 50 Hz 250 kVA, 22 kV, 400/230 V. The results shown the assigned data, dashboard, and notices message that notices relate the FMEA scripts. The technique provides early warning detection of transformer statuses that make opportunity to take corrective action to prevent failure.
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    Design and implementation of the laboratory for foundation Fieldbus-Based industrial automation
    (2012-05-01)
    Thepmanee, Teerawat
    ;
    Pongswatd, Sawai
    ;
    Julsereewong, Amphawan
    ;
    Julsereewong, Prasit
    This article focuses on a design and implementation of the laboratory for education of Foundation Fieldbus-based industrial automation. A Centum VP system connected with level-control plant model via field digital network is described as an illustrative case study for configuring and commissioning fieldbus segment, defining control strategy, designing human machine interface (HMI) screen, and troubleshooting.