Abstract
Considering the objectives of based preventative maintenance strategy, condition assessment was performed over two load tap changers of 125 MVA power transformers in 230/63 substations using dissolved gas analysis (DGA). The selected load tap changers were: (1) an MR M-type load tap changer and (2) an Elin load tap changer. Choosing load tap changers of 230/63 kV power transformers are quite reasonable since the mentioned power transformers are the most frequently being used power transformers in Iran. The oil samplings were performed according to ASTM D 3613 standard, in two stages and in a three-month interval. Furthermore, samples were analyzed for dissolved gases considering ASTM D 3612 standard. (4 pages)
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