Abstract:
Partial discharge in power transformer can be the original cause of transformer damage. There are several methods for detecting the partial discharge. However, the dissolved gas analysis (DGA) is currently the most well-known method to detect the partial discharge because it can perform on-line testing without shutdown the power system and also provide high accuracy of testing.
This thesis presents a model to investigate partial discharge in the insulating oil. The new insulating oil is employed by filling in the testing vessel. Then, it is applied by AC high voltage under the conditions of varying electric field and humidity in the insulating oil. The model also includes the investigation of partial discharge in the insulation paper. Then, the dissolved gases are analyzed follow the standard ASTM-3612-02.
The results show that hydrogen (H[subscript2]) and methane (CH[subscript4]) occur when partial discharge was taken place and they were increasing severity all along the partial discharge period. Therefore, the results can be used to classify the trend of increasing the intensity of the partial discharge.