DESIGN AND FABRICATION OF SYSTEM MEASURING DISSOLVED HYDROGEN GAS IN TRANSFORMER OIL
This paper works on system that monitors concentration of hydrogen dissolved in transformer oil. The system has a closed chamber that is used as a transformer oil container. Oil temperature in the chamber can be adjusted by controllable heater. Stirring motor and gas pressure part are also integrated to speed up the dissolution of hydrogen in oil and to observe gas pressure difference. In this research, group chooses voltage distribution method to determine the value of resistant of hydrogen sensor. Resistant value varies from hundreds of kΩ to 1MΩ. Micro control unit STM32 is utilized for collecting, processing measured data and transmitting to computer through RS232 port. The result shows that the system works stably. Consequently, experimenting sensors sensing hydrogen dissolved in transformer oil becomes less difficult because it is very hard to prepare experimental condition of real transformer.
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