The Journal of Industrial Technology Thepsatri Rajabhat University

Short-Circuit Current Analysis in Distribution Power Systems with Grid-Connected Photovoltaic Systems for Protection Element Design

TRIRATH PATI — 2026-06-23

The growth of renewable energy with photovoltaic is extremely expanding in the present time. The favorite solution of photovoltaic installation is the grid connection to the existing distribution power network that is similar to enhance electricity generation source into the network. According to power system analysis fundamental, short circuit current and electric equipment in network will be affected. That is the reason to propose short circuit current analysis in distribution power network with addition of electricity generation source. The model of distribution power network, which consist of utility (main power source), SPP generator and photovoltaic, will be created and analyzed to achieve short circuit current according to IEC 60909. The result will be applied to consider rated electrical equipment and operation pickup value according to IEEE C37.230 (2020) IEEE C37.234 (2021)

Design and Performance Evaluation of a Rice Straw Chopper for Enhancing Agricultural Waste Processing Efficiency in Paper Production in Khlong Luang Phaeng Sub-District Chachoengsao Province

Kalong Buanak — 2026-06-23

This research aims to develop a rice straw chopper innovation to enhance the efficiency of rice straw paper production within the Khlong Luang Phaeng community, Chachoengsao Province. The methodology involved the design and fabrication of a 1.5 horsepower rice straw chopper prototype, followed by a performance evaluation comparing the reference baseline of the conventional chopping method with experimental results obtained from the prototype. The results show that the prototype machine significantly decreased raw material preparation time, with the average duration decreasing from 23.33 minutes per kilogram to 1.21 minutes per kilogram. Concurrently, an increase in straw mass loss was observed, totaling 99.09 grams, or 9.91 percent of the initial straw volume. The experimental results unequivocally indicate that the implementation of the rice straw chopper effectively resolves the raw material preparation bottleneck, successfully achieving the goal of increasing the production rate and elevating the overall capability for processing agricultural waste. However, the increased material loss presents a critical consideration for the future development of the chopper's design, necessary to attain a processing system that maximizes efficiency in both time and resource utilization.

Development of simulated battlefield scenario maps

Thanet Lertjameekorn — 2026-06-23

This research aimed to develop a simulated combat area mapping system covering at least 30 square kilometers using Unmanned Aerial Vehicle (UAV) technology combined with aerial photogrammetry processing. The study was conducted at Phu Lamai training field in Nakhon Ratchasima Province, utilizing a DJI Mavic Pro 2 drone, Pix4DCapture software for flight planning, and WebOpenDroneMap for map processing.The research methodology involved testing various flight configurations including overlap and sidelap settings of 60/60, 70/70, and 80/80, flight altitudes of 300 and 400 meters, and image resolutions of 7 and 50 centimeters per pixel. Ground Control Points (GCP) were employed to enhance coordinate accuracy.Results demonstrated that the 60/60 overlap configuration at 300-meter altitude provided optimal performance when considering the balance between flight time (450 minutes), processing time, and map quality. Maps with 7 cm/pixel resolution required 1,400 minutes processing time with 5.6 GB file size, while 50 cm/pixel resolution maps required only 110 minutes with 222 MB file size. The use of at least 5 GCP significantly reduced coordinate deviation. The 50 cm/pixel resolution maps proved suitable for installation in artillery fire control systems and tactical-level combat planning.The research contributes valuable insights for military mapping applications, demonstrating that UAV-based mapping technology can effectively produce high-quality tactical maps with optimized resource utilization. The findings provide practical guidelines for selecting appropriate flight parameters and resolution settings based on specific operational requirements and resource constraints.

Determination of Optimal Hot-Air Drying Conditions for Dried Bananas Using Design of Experiments

Chanathip Kalchuk — 2026-06-23

This research focuses on addressing the issue of quality instability in the dried banana products of the "Khon Rak Wang Takiang" community enterprise, which results from reliance on natural solar energy in the drying process. To standardize the production process, the researcher designed and developed a hot-air drying device that can precisely and consistently control temperature and time. After the development of the equipment, the researcher applied statistical methods for factorial design to analyze the influence of two main factors: drying temperature at 50°C, 60°C, and 70°C, and drying time at 4, 6, and 8 hours. The response variables used for quality evaluation were moisture content (%wb) and texture score of the dried bananas. The statistical analysis (p-value < 0.05) clearly confirmed that both drying temperature and time have significant interactions and main effects on the quality attributes of the product. The optimal drying condition was determined to be 60°C for 6 hours, resulting in a final moisture content of 20% (wb) and the best texture score of 4.5 out of 5. This research presents a practical and sustainable approach by integrating a controllable drying device with statistical principles to enhance quality standards and improve the production process of the community enterprise efficiently. The findings of this study can reduce variability in product quality and serve as a standard guideline that can be effectively applied in the production processes of community enterprises.

The Using of TRUdairyFeed Program on Knowledge Adoption, Feed Cost and Return and on Milk Production of Dairy Farmers in Dilang Sub district, Patthananikhom District, Lop buri Province

Amphol Jupamatta — 2026-06-23

A participatory approach was employed to enhance the capacity of dairy farmers through knowledge transfer on dairy nutrition and training in the use of the TRUdairyFeed program for ration formulation. The improved rations were subsequently implemented in dairy herds in Dilang sub district, Patthananikhom district, Lop buri province. Data on knowledge adoption were collected through satisfaction assessments, and milk production was evaluated before and after dietary adjustment over a three-month period. The results indicated that knowledge adoption among dairy farmers was at a good level on average. The use of the TRUdairyFeed program resulted in rations with nutrient composition and proportions closer to the requirements of dairy cattle. However, due to limited financial resources and reliance on locally available feed ingredients, the rations were still deficient in rumen undegradable protein and net energy for lactation. The feed cost was 5.50 Baht/kg. Total mixed ration (TMR) feeding was not implemented on farms. Feed intake decreased by 5.75 kg/head/day, while feed cost was reduced by 5.88 Baht/head/day. Economic return increased by 16.74 Baht/head/day. Milk yield averaged 14.29 kg/head/day, representing an increase of 0.79 kg/head/day. Several milk quality parameters tended to improve; however, milk protein content remained below the standard threshold. There were no statistically significant differences were observed between pre- and post-ration adjustment in all measured parameters. In conclusion, a good level of knowledge adoption was achieved among dairy farmers. The application of the TRUdairyFeed program for ration formulation contributed to reduced daily feed costs, milk yield and several milk quality parameters tended to improve. Therefore, further dissemination of this knowledge and technology to dairy farmers is recommended.

EV Charging Behavior and Distribution Load Management : A Case Study from the PEA Volta Platform

Surapong Keanmanee — 2026-06-23

This study aims to analyze the Electric Vehicle (EV) charging behavior of Provincial Electricity Authority (PEA) customers based on real-world data comprising 48,752 charging sessions collected from 124 DC Fast Charger stations installed by P.G. Electric Group Co., Ltd. and integrated with the PEA Volta platform. The analysis covers the 14 month period from January 2024 to February 2025.The results reveal that users predominantly choose to charge during Off-Peak hours (22:00–09:00) accounting for 62.2% of total sessions, compared to 37.8% during Peak hours, yielding an Off-Peak to Peak session ratio of approximately 1.65:1. The average energy delivered per session during Off-Peak periods was 57.2% higher than during Peak periods (29.4 kWh versus 18.7 kWh). Full charging to 100% state of charge (SoC) occurred in 41.7% of Off-Peak sessions, in contrast to only 12.3% of Peak sessions. Charging activity was heavily concentrated in the Central and Eastern regions, which together accounted for 81.5% of all sessions. The CCS Combo II connector was the most frequently used standard, representing 64.1% of total charging events. The findings indicate that the Time-of-Use (TOU) tariff structure effectively shifted charging demand away from peak periods, resulting in an estimated reduction of Peak Charging Demand by approximately 24–28%. These results provide valuable insights for strategic planning of charging infrastructure expansion, implementation of dynamic pricing mechanisms, and development of smart charging systems to support the continued growth of electric vehicles within the distribution network. Note: The total dataset of 48,752 charging sessions was used for system-level statistical analysis and contextual framing, while a representative sub-sample of 86 sessions across 12 provinces was used for behavioral pattern analysis presented in the results section.