| Summary: | 碩士 === 崑山科技大學 === 電機工程研究所 === 97 === According to the more and more high expectations of the power supply dependability followed by economic development and livelihood, makes the electricity to be more and more important from power plants to substations, and then from transformers to the customers of industry, commerce and family. The oil-immersed transformer can be regard as the heart of the power supply system. It has very important meanings for energy transmission, flexible distribution and safe manipulation. If it is out of order, it will create a serious effect. However, transformer insulating oil is one of the essential links for power supply protection. To certify the reliable operation of the transformer and decline the maintainable fee, there are several different monitoring and analytic methods that can examine the potential disordered information ahead to prevent from extending the accident. The dissolved gas analysis (DGA) can extract the oil sample on-line, and then separate and analyze the dissolved gas to determine the operation conditions and disorder styles of transformers. And it owns the positive action for protective equipment and safe operation of power system due to its high sensitivity and effectiveness.
This thesis is studied the dissolved gas analysis by using flammable gas elements, amounts, and ratios to determine the disorder types in oil-immersed transformers. If the disorder type does not occur from the transformer itself and the electric characteristics but occur from the inferior quality of the insulating oil, it can be improved by the oil activation recycling treatment to treat the transformer insulating oil. After the oil activation recycling treatment used to these two main transformers of the National Cheng Kung University, its results solidify the feasibility and effectiveness of the proposed method.
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