| Summary: | 碩士 === 國立雲林科技大學 === 環境與安全衛生工程系 === 104 === An electric power system is composed of a generating system, transformation systems and distribution system. Among these, we have problems of a voltage drop due to long transportation. To cope with the problem of voltage drop, we need to site a transformer to address the specific problem. Therefore, in view of loss prevention the transformer is an essential piece of equipment in the electric power system.
In practice, transformers are classified by heat dissipation, which consists of dry type transformer and oil immersed transformer. Numerous major accidents have been caused by oil-immersed transformers, with the main factor attributed to electric insulating oil (EIO) inside the transformer.
In this study, we reviewed references about leakage accidents of these transformers to investigate whether the temperature could cause EIO to deteriorate. Differential scanning calorimetry (DSC) and thermogravimetry (TG) were used to measure the thermal runaway excursion on EIO, and afterwards we performed voltage-endurance tests to detect the capacity of insulation in differential temperature. The study found that the insulation capacity of EIO was influenced by abnormally higher temperatures. When temperature was increased, insulating capability would be substantially limited.
The result showed that when temperature was increased, the insulating capability of insulating oil would increase. Abnormally high temperature created problems of insulation deterioration, causing fire hazards or accidents of the oil immersed transformer. This caused the electric power system to be ineffective, which led to economic loss, catastrophes, even social outcry.
Our study can provide information about inherent safety in utilization of oil immersed transformers, anticipate lower risk, and prevent leakage incidents of EIO from oil-immersed transformer, as an ultimate objective.
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