Chompoo_Inwai, Chow

Preferred name

Chompoo_Inwai, Chow

Alternative Name

Chompoo-Inwai, Chow

Chompoo-inwai, Chow

Chompooinwai, Chow

Chompoo-inwai, C.

Chompoo-Inwai, Chai Chow

Chompoo-Inwai, Chow Chai

Main Affiliation

School of Engineering

chow.ch@kmitl.ac.th

Now showing 1 - 10 of 31

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Research of Magnetic and Electric Fields to Design and Develop the Prototype of Magnetic Resonance Imaging Device
(2025-01-01)
Chompoo-Inwai, Chai
;
Chompoo-Inwai, Chow
;
Suksathit, Witchayaphorn
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Kaewpromrat, Weerapat
;
Maneerat, Saranyu
This research presents a study and preliminary design of a main magnetic field generation system for an MRI machine using simulation software. The objective is to investigate the factors affecting magnetic field strength. Six coil models were preliminarily designed and simulated to analyze the magnetic field behavior. Simulation results were compared with experimental magnetic field measurements, showing that the software accurately reproduces the magnetic field. It was found that distributed winding improves field uniformity, and that both the number of coil turns and conductor size directly affect the strength of the main magnetic field in the air core.Based on the simulation outcomes, a prototype magnetic field generation system was designed. The proposed prototype consists of an aluminum core with a diameter of 110 mm and a height of 335 mm, suitable for arm imaging. The system uses a superconducting NbTi wire wound 6,516 turns in eight segments, with a current of 120 A. Cooling is achieved using a cryocooler model RDE-418D4 4K, which can reach temperatures as low as 4.2 K. This study provides essential guidance for the development of main magnetic field systems in future MRI devices.
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An analysis of total loss and temperature of oil-immersed transformer with short circuit test linear load and non-linear load
(2005-01-01)
Suechoey, B.
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Tadsuan, S.
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Khluabwannarat, P.
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Chompoo-inwai, C.
This paper presents the measured temperature at top oil and on winding at high voltage part, low voltage part due to winding loss. By placing the thermocouples at the bottom, the middle and the top of mineral oil-immersed transformer, the variety winding temperatures are measured. The 3 - test conditions are 1. Short circuit test, 2. Linear load test and 3. Non linear load test. The temperature results show the difference temperature at any parts of the 10 kVA, 380V/220V, 3 phase, Dyn11 and ONAN ventilating transformer. The results of measured temperature will be compared with one another to get the difference temperature. If that temperature is higher than the rated temperature of insulator in transformer, its lifetime will be shorter. Finally, the result will be analysed about the relations among heat at any part and are useful for design, correction and protection of the transformer by heat.
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Implementation of a Face Detection Surveillance Security System in a Rice Farm Using Supervised Machine Learning Techniques
(2025-01-01)
Polset, Siriwan
;
Chompoo-inwai, Chow
This paper presents an innovative approach to developing a surveillance security system tailored for the agricultural sector, specifically rice paddy fields in Thailand, by employing supervised machine-learning-based face detection techniques. The proposed system integrates real-time facial recognition with automated notifications sent to the owner via text messages and facial images through the LINE application. Video inputs from on-site CCTV cameras are processed into a sequence of images, from which key facial features are extracted using the Haar-like feature extraction method. Identification of individuals as either authorized owners or intruders is achieved through supervised machine learning utilizing the K-Nearest Neighbors (K-NN) algorithm. Upon detecting an intruder, the system promptly activates an alarm and sends notifications, enhancing real-time security monitoring. The system is implemented using a Raspberry Pi microprocessor and is powered by a stand-alone solar energy system, ensuring sustainability and operational efficiency. Performance evaluation includes extensive testing, verification, and comparison against conventional methods using the widely recognized Labeled Faces in the Wild (LFW) dataset. Experimental results demonstrate that the proposed system achieves an average accuracy of 86.86%, slightly surpassing traditional techniques. Additionally, it exhibits a significantly improved recognition speed, averaging 8.3 seconds per detection. Robustness and adaptability were further assessed by evaluating the system under varying brightness and distance conditions. The findings confirm the system's ability to provide real-time, precise facial recognition of intruders, thereby establishing its effectiveness as an advanced surveillance security solution. The system's operational boundaries for successful intruder recognition and warning alerts are set within a 1 to 3-meter range from the camera. Recognition accuracy was observed at 95% under optimal conditions and 83% in more challenging scenarios, while the warning alert system demonstrated a success rate between 86% and 97%. These results highlight the proposed system's superior performance and reliability, making it a valuable security solution for agricultural applications.
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Oil-immersed transformer temperature monitoring by ANSI/IEEE C57.91 model
(2007-12-01)
Maleewat, P.
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Tadsuan, S.
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Saelee, V.
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Chompoo-inwai, C.
This article presents the development of a 3-phase oil immersed transformer temperature monitoring equipment. The developing prototype employs ANSI/IEEE C57.91 standard mathematical model to calculate the hottest spot of the transformer winding, and use the AT89CS8252 MCS51 microcontroller for an implementation. Main components of the newly developed prototype consists of input sensors, MCS51 microcontroller, and 7-segment display. Input sensors are RTD (PT100), CT and PT. An output display is 7-segment displaying transformer current, voltage, ambient temperature, top-oil temperature and hot-spot temperature. Test results show that measuring temperatures obtained from the new prototype are close to those from the conventional standard measuring instruments (CSI). As a result, transformer industries can find the benefits of the developing prototype of gathering and analysis transformer temperature data. In addition, this equipment can notify operators if their operating transformers are withstanding the overload or over temperature or not. © 2007 RPS.
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Comparision of power loss of three-phase induction motor of four techniques with PWM inverter supply
(2007-12-01)
Tadsuan, S.
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Suechoey, B.
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Saelee, V.
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Chompoo-Inwai, C.
The purpose of this research is to study the power loss in three-phase induction motors linked with a three-phase PWM inverter by adjusting various fundamental wave voltages of the motors. The experimental procedures used four adjustment techniques as: 1. Constant DC link voltage inverter and adjusting the modulation amplitude 2. Constant modulation amplitude equal 1 and adjusting DC link voltage of inverter 3. Sixstep inverter and 4. Constant modulation amplitude equal 2.3 (over mod land adjusting DC link voltage of inverter. The four techniques were used to adjust V/f-type fundamental waves. The results indicated that the adjustment technique showing the power input, power output, power loss and efficiency of the motor. © 2007 RPS.
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Fast laser Quantity Measurement of Pest Box Imaging Using End-to-End Real Time in Thai Rice Farm
(2021-01-01)
Polset, Siriwan
;
Chompoo-Inwai, Chow
In this paper, the researcher development a fast laser quantity measurement of pest box imaging using end-to-end real time in Thai rice farm. Usage of a small, light, low-cost, high precision laser raining sensor for detected pests in rice farm and send number data to ESP32-CAM then it will take a pest box picture send to user application LINE. The processing can save statistical data from laser raining sensor on memory card of ESP32-CAM for quantity pests analysis. The researchers had designed pest measure box two sets and install in rice farm an area of 3.2 acre. The experiment is quantity measurement of pest box in the real environment of rice grow season in Thailand. Measurement were for 3 different period of time: rice seedlings to tillering stage (30 - 45 days old), rice at full tillering stage, pregnancy-to-earth rice. The results show a lot of pest the before harvest season is pregnancy to earth rice.
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An Optimum Technique for Renewable Power Generations Integration to Power System Using Repeated Power Flow Technique Considering Voltage Stability Limit
(2016-01-01)
Wannoi, Chaisit
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Khumdee, Anurak
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Wannoi, Narumon
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Chompoo-Inwai, Chai Chow
This paper presents an optimum location definition and technique for a better placement location of renewable power generations in a wide area power system using repeated power flow technique considering voltage stability limit. In this study, for a better understanding, the author have implemented the newly proposed idea on Thailand's power system especially focusing on renewable generation support plan from the government policy under the current Power Development Plan (PDP 2015). The study results have compared between: 1) installation the renewable generation at the newly recommendation area and 2) installation the renewable generation facilities throughout into distribution system in the Northeastern area of Thailand. The study results focus on impaction to voltage stability when system has load demand increasing and generation capacity decreasing. This study, a Modified-Thailand's power system during peak load in 2013 was used as a system base case with generation capacity around 27,400 MW and load demand around 26,810 MW while system losses 590 MW. The results found that the newly proposed technique can define optimum location for install renewables generation in wide area to enhance system security in term of voltage stability impaction. This technique may also carry to define the installation of other equipment as FACTS devices or define generation dispatch for Automatic Generation Control system (AGC) for power system stability enhancement.
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A case study on Thailand's New Teleprotection regulation: Direct transfer trip application in distributed generation network
(2017-01-01)
Chotiwanaporn, Naradon
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Chompoo-Inwai, Chow
This research paper presents the new idea of applying the transmission line teleprotection scheme called direct transfer trip (DTT) technique to use with a closed-loop distribution network. A large-scale 163MW gas turbine power plant connected to a three-substation closed-loop distribution network was chosen to be a case study here. A newly-proposed DTT configuration, DTT logic diagram and circuit breaker trip matrix had been redesigned and presented in this paper. For the proposed DTT configuration, several remote terminal units will be installed at every substation connected to the distribution network, whereas the logic controller will be installed at the selected power plant. A huge advantage over the conventionally-installed zoning peer-to-peer protection scheme is that the proposed DTT logic controller is able to almost instantaneously compute and send out the clearing faults command, regardless of fault locations in this particular closed-loop distribution network, while the conventional one cannot in many cases. Additional benefit is that the proposed DTT teleprotection scheme completely prevent the generators from operation in island mode resulting in minimal lost and damages caused from this circumstance. The relay test tool is used to verify the proposed DTT protective capabilities and speed. The simulation and commissioning test results confirm the proper functionality of the proposed technique. The implementation to the real field has been done and presented here as well. What we have learned from this case study shall be a very good guideline for other similar circumstances.
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Novel Techniques for Critical Load Buses Identification and Load Bus's Available Capacity Calculation to Improve Power System Stability
(2020-07-01)
Wannoi, Narumon
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Jirsuwankul, Nirudh
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Chompoo-Inwai, Chow
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Chompoo-Inwai, Chai
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Wannoi, Chaisit
this paper presents two novel techniques for critical load buses identification and load bus's available capacity (LBAC) calculation to improve power system stability. The critical load bus identification is applied by contingency analysis considering system violation limits under load shedding impact. The violation limits consist of two limits including voltage and percent loading limits of power transfer equipment. As the LBAC calculation, the available transfer capability (ATC) of all multi-lines connected on each load bus are investigated with the total transfer capability (TTC). To validate the effectiveness of the proposed approach, the modified Thailand power system during summer peak load in areal (load center) is used for a system base case. As the results, it is found that the proposed techniques can effectively obtain and rank critical load buses as well as to calculate the LABC. The strong relation between these two indexes can be applied to improve power system stability.
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Failure analysis of dielectric of low voltage power capacitors due to related harmonic resonance effects
(2001-12-01)
Boonseng, C.
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Chompoo-inwai, C.
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Kinnares, V.
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Nakawiwat, K.
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Apiratikul, P.
This paper presents an investigation on the failure of low voltage power capacitors used in the textile industrial located on Thailand. The causes of the failure as well as the failure mechanisms of the dielectric used as the insulation of such capacitors are analyzed. It is found that the harmonic resonance can increase the current flowing through the capacitors. This result in the extra heat, generated inside the dielectric, which exceeds the level under the normal operation. Such heat results in the increase of the partial discharge inside the capacitors. This can eventually lead to the reduction of the lifetime of the capacitors.

Chompoo_Inwai, Chow

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