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    Application of a small transformer for designing current detection and overcurrent protection circuit for laboratory tables
    (2022-01-01)
    Arunrungrusmi, Somchai
    ;
    Phanphech, Parinda
    ;
    Mungkung, Narong
    ;
    Tanitteerapan, Tanes
    ;
    Poonthong, Wittawat
    The purpose of this research is to study, design and build over current protection circuits for low voltage AC supply for electrical and electronic circuit experiments in laboratories to prevent damage to circuits and equipment. The use of transformers as current detectors in this research focuses on 3 issues: 1. Circuit design and testing 2. Determination of voltage drop and power loss at current sensing transformer 3. Finding the efficiency of the designed circuit. This test will be performed 5 times to ensure the accuracy of the designed circuit. The research results showed that the designed circuit can cut the circuit efficiently and with precision, the designed circuit has an error of not more than 1%, can cut off the circuit when an over current occurs and prevent short-circuit and reduce the rate of damage of the device
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    Calculation and Prediction of Technical Losses and Line Feeder Size Effect on Distribution Line Losses using PSS/Adept Program AS A Case Study
    (2021-01-01)
    Mungkung, Narong
    ;
    Gomrat, Nittaya
    ;
    Arunrungrusmi, Somchai
    ;
    Poonthong, Wittawat
    ;
    Songruk, Apidat
    This study was aimed to present a Technical loss analysis of the Provincial Electricity Authority (PEA) in Hatyai. To determine the technical loss in the distribution system included are Transmission Line Losses, Power Transformer Losses, Distribution Line Losses and Low-voltage Transformer and Distribution Line Losses. It was found that Low-voltage Transformer and Distribution Line Losses had a maximum value of 79 % and Technical loss was at 3.43. So in controlling or decrease Technical loss, the appropriate and correct method had to be selected by investigating both cost and worth. This study was also to determine distribution line losses by electrical model and to report on the power losses evaluation method as an improvement method to reduce the investigation cost for both transformer and capacitor selection. The study further aims at increasing the efficiency and reliability of the distribution system by reducing Technical Losses by increasing feeder size, power factor correction, reducing feeder impedance, lower transformer losses. It was discovered that line losses have much value at the end line. This was found to decrease when loads have constant distribution and are near the source. That is, line losses have lower value when lead lines have a larger size. Both load distribution and lead line sizes were observed to affect distribution line losses.
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    A novel AC electronics load surge protection
    (2010-12-01)
    Mungkung, Narong
    ;
    Arunrungrusmi, Somchai
    ;
    Mongkolkaset, Prasit
    ;
    Noicharoen, Nongnuch
    ;
    Sangmongkhol, Tawan
    This article examines the design of AC Electronics load surge protection as surge arrester in the voltage electricity system with lack in sustainability and quality. At present, most surge protection devices could deal with either transient over voltage or surge. In real practice, the devices must be effective to prevent surge in electrical power system. Therefore, the researchers conducted a research on AC electronics load surge protection which could prevent both transient over voltage and voltage swell. The operation of the designed protection device works well and in compatibility with both two modes. The test of the protection device showed that let through voltage was at safe range and load continued to work, resulting in the ability to improve and modify the quality of electrical power in Thailand electricity distribution system more effectively than the past and helping increase the lifetime of electric appliances, electric devices, and electricity protection devices.