Aging characteristics of power transformer oil and development of its analysis using KSOM

In power systems, substation facilities have become too complex and large according to the extended power system. Also, some facilities become old and often break down unexpectedly. In order to improve the security of the transformer in substation facilities, the development of a transformer diagnosis technique is needed. In this paper, we developed a method to analyze the origin and degree of aging by KSOM based on the dissolved gases in a power transformer. KSOM can perform topological mapping for the multi-dimensional pattern based on the dissolved gases to two-dimensional plane. The possibility and degree of aging for a normal transformer are presented using the proposed quantitative criterion. Furthermore, the aging process of the transformer is analyzed based on the proposed criterion of a special transformer. To demonstrate the validity of the proposed method, a case study is performed and its result is presented.