Abstract:

There are some disadvantages in the conventional methods of measuring the moisture content in transform oil such as low accuracy and high price. We propose a method of calculating the moisture content by measuring the relative humidity in oil, after studying the relation between the moisture content and the relative humidity in transformer oil. We design an online monitoring system of moisture content measuring in the transformer oil base on the above method. The result of stability test and veracity test proves that this system which features high accuracy, sample operation and unused reagent meets the requirements of the field application.

Key words: moisture content in transformer oil;relative humidity;online monitoring