It is extremely important to control the humidity content in a transformer since the content of the humidity has a great influence on the proper functioning of the transformer and its lifetime. In this Master’s Thesis, we wanted to establish the appropriateness of the direct method that enables measuring the residual humidity in cellulose insulation. The two most critical drying materials proved to be thick plywood and special material called Transformerboard. The most optimal methods for measuring the residual humidity have proved to be the gravimetric method and dew point measurement.
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