Transformers with expansion tanks have the same core and coil structure as hermetic transformers. The dimensions of the expansion tanks of this type of transformers are designed and manufactured as a result of calculations to store the expansion of the oil whose volume increases with temperature.
Since the transformers with expansion tank are open to the atmosphere, the oil pressure changing due to thermal effects, the air exchange is provided by dehumidifying the air thanks to the clikajel (air dryer) in the transformer tank.
Depending on the load of the transformer with expansion tank put into operation, as a result of the air exchange caused by temperature differences, the glycagel loses its properties over time and causes the oil to moisten and deteriorate its structure. For this reason, it is necessary to perform maintenance such as replacing the silica gel in certain periods and measuring the puncture voltage by taking samples from the oil.
Transformers designed to operate under specific operating conditions, overcurrents, overvoltages and reactive loads for special purposes are called special type transformers. Due to the special operating conditions, the design of these types of transformers is handled specially. Special transformers are considered as the highest point of the transformer sector due to the knowledge, labour experience, care and precision required by both design and production technology.
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