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The Development of Enteral Feeding for Home-Use Patients
(2025-01-01)
Laokor, Patipan
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Suksawat, Dusit
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Wanluk, Nutthanan
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Thanarak, Jeerawan
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Chompoo-Inwai, Chai
With the rising number of bedridden patients, affordable and accessible enteral feeding solutions are urgently needed. The high costs of imported feeding systems remain a burden for caregivers, especially in developing regions. This study presents the development of a cost-effective enteral feeding controller that utilizes a unique four-lobe camshaft mechanism, compatible with locally manufactured feeding bags. The redesigned mechanical structure focuses on simplifying the feeding operation while reducing overall device weight. The upgraded electronic control system, combined with a TFT LCD touchscreen, enhances usability. Performance testing demonstrated consistent flow rate accuracy at various levels and showcased the mechanical efficiency of the camshaft-driven feeding system. The successful outcomes of this project have led to commercial interest from a domestic medical device manufacturer, indicating readiness for standardization and mass production.
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The Experiment of VLF Tanδ on Service-aged MV Underground Cable
(2024-01-01)
Tangthanam, Worasak
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Bunlaksananusorn, Chanin
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Suksawat, Dusit
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Udomluksananon, Patt
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Jeenmuang, Siwakorn
This paper presents the service-aged MV underground cable experiment using very low frequency (VLF) testing. The underground cables in this experiment have been utilized in service for more than 10 years and subjected to TEAM stresses, particularly with moisture, throughout the service time. So, the effect of moisture leads these cables to bad condition. The cables under the experiments are both service-aged and unaged. These cables were prepared the same by peeling both end sides of the cables and were terminated with high voltage insulating tape. The VLF test combined with the tangent delta (tanδ) measurement, according to IEEE Std. 400.2-2013 was performed to assess the condition of these cables and compare them with the unaged cable. The test results revealed that according to IEEE standard 400.2-2013, the service-aged underground cables were assessed in Action Required criteria. Still, the unaged underground cable was assessed in the Further Study Required criteria. Moreover, the tanδ values from service-aged underground cables have significant differences, with service-aged underground cables having higher values than unaged cables. Besides, the variation of tanδ data samples at each test voltage level from some underground cables shows a decreasing trend at 1.0U0 and 1.5U0. Nevertheless, the test voltage at 0.5U0 shows the constant trend of tanδ samples. This analyzed result can indicate that the insulation condition has humidity inside the cable insulation.
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The Time Domain Dielectric Response of 138 kV and 550 kV OIP Bushing
(2024-01-01)
Yamsiri, Thummanoon
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Bunlaksananusorn, Chanin
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Suksawat, Dusit
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Rojanasunan, Warisanan
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Jeenmuang, Siwakorn
In this paper the dielectric response in time domain which is polarization and depolarization current (PDC) measurement is applied to assess the global condition of OIP bushings. The bushings in this paper are five 138 kV OIP bushings and three 550 kV OIP bushings which are out of service already. From the PDC results, capacitance and current trends of both voltage levels were investigated individually. PDC results in this paper can be useful data for further analysis and diagnostic.
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Investigation of Dielectric Response in a 22/0.4 kV Distribution Transformer: Effects of Moisture Content
(2024-01-01)
Daengdee, Danaiwat
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Bunlaksananusorn, Chanin
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Suksawat, Dusit
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Chumpiboon, Komin
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Jeenmuang, Siwakorn
Transformers play a crucial role in power systems, ensuring efficient energy transmission and distribution. This research focuses on a 22/0.4 kV transformer decommissioned after over 20 years of service. The study involves draining the transformer oil completely and refilling it with oil characterized by known moisture content and breakdown voltage levels until reaching normal operating conditions. The objective is to study the effects of increased moisture content on the dielectric response within the actual structure of the transformer. Diagnostic measurement techniques, including Frequency Domain Spectroscopy (FDS) and Polarization Depolarization Current (PDC), are utilized to evaluate the insulation condition of the transformer. FDS provides information on the dielectric response over a wide frequency range, while PDC assesses the polarization and depolarization behavior of the insulation material. These techniques offer valuable information on the ageing and moisture content of the insulation. The experimental results will be presented and discussed in this paper.
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Furan Analysis of Oil Impregnated Paper Aged by Chemical Stress
(2020-10-25)
Suksawat, Dusit
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Atthaphotpong, Kittiphot
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Takboontam, Kriangsak
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Satirapattanakiat, Kanin
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Raphephat, Chiranuwat
The objective of this paper is to study the deterioration of impregnated kraft papers immersed in dielectric liquids under the chemical stress conditions by furan analysis according to ASTM D5837 and IEC 61198. Mineral oil and natural ester (FR3) were liquid used in this study. Kraft paper samples, 3 pieces per each case study, are prepared in rectangle shape with 25.4 ± 0.5 millimeters (1.00 ± 0.02 inches) wide and approximately 254 millimeters (10.0 inches) long according to the ASTM D828 standard. The paper and liquid insulation are heated to dehydrate at 80 °C for 12 hours with 200 mbar pressure, and then they are filled in 200 milliliter bottles and heated with 5 different temperatures being 60 °C, 80 °C, 100 °C, 120 °C and 140 °C respectively. In the case of 120 °C and 140 °C are only conducted with FR3 due to its thermal characteristics. After that, 98% concentration of acetic acid of 2 quantities, 0.04 and 0.08 milliliters, and oxygen (O2) at 1 psi for 1,200 ml, are used for the chemical aging process for 9 days of the test samples before being tested to find furanic compounds. According to the test result, it can be concluded that all 4 factors, temperature, acetic volume, oxygen and moisture, effect on generated furanic compounds of aging paper insulation.
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Investigation of Very Low Frequency Dissipation Factor of the Contaminated Underground Cable Joints
(2020-10-25)
Suksawat, Dusit
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Hengcharoensuk, Tassana
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Nupinit, Thanapon
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Chusang, Kittidech
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Ravangvong, Tanachot
This paper presents the characteristics of the contaminated underground cable joints tested by a very low frequency voltage source. The underground cable system used in the experiment was comprised of a 12/20(24) kV underground cable with a cross-section area of 240 mm2, and the length of 6 m. Four different case studies were simulated on the cable joint, i.e., a healthy heat shrink cable joint (case 1), a cable joint with an incision on XLPE surface(case 2), a cable joint contaminated with 20-micron iron powder on XLPE surface(case 3), and a cable joint contaminated with 20-micron copper powder on XLPE surface(case 4). The dielectric dissipation factor, also known as tan δ at very low frequency (0.1Hz) of such underground cable systems, was examined at 0.5 U0, 1 U0, and 1.5 U0, respectively. The very low frequency(VLF) test voltage was applied to the cable specimen, according to IEEE 400.2(2013). The test voltage was recorded and analyzed. It was found that the cable joint contaminated with 20-micron iron powder on XLPE surface had a maximum tan δ. The tan δ value decreased respectively for the cable joint with an incision on XLPE surface and the cable joint contaminated with 20-micron copper powder on XLPE surface. The healthy heat shrink cable joint showed the lowest tan δ. It was clearly shown that the contaminated cable joint caused higher very low frequency tan δ compared with the healthy cable joint.

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