Abstract:
This paper described the estimation of optimum load and thermal response for the Oilnatural
Air-natural (ONAN) cooling type power transformer with installed load capacity
of 30MVA in Sarawak, Malaysia. The estimation optimum load capacity is based on the
nameplate rating, standard design of the existing transformer and factory acceptance test
report (FAT). This involved loss of life and transformer thermal response such as hotspot
temperature, top-oil temperature, winding temperature and ambient temperature.
By using the existing cyclic load of this transformer, the risk condition of the
transformer could be prevented since capacity load could be estimated. The algorithms
of this project were based on IEEE standard and IEC loading guide for oil-immersed
power transformer.