The Design of Electrode for Partial Discharge Location Simulation in Oil Insulated Power Transformer and the Application of AE Method

This paper presents the design of electrode for PD-location simulation in oil insulated power transformer and the application of Acoustic Emission (AE) method. The purpose of this design is to make a simple PD signal simulation and to save the time of experiment. The design must take into account the electric field stress at the electrodes (anode) that will cause PD. The electrodes were designed as 2 types. The first is a conventional electrode expected to make a high nonuniform field. The second electrode was designed as insulation layer and transformer coil to generate higher nonuniform field and expected to cause PD easily. Electrodes were simulated to determine the maximum of electric field by installing in the transformer model. Then, the electrodes are installed in the transformer model to make the real test by supplying high voltage to the electrodes to generate PD signal. From the measurement results of PD-location in the power transformer model according to AE and TDOA method found that, the first electrode has uncertain PD-location measurement results. Moreover, it take so long time of any experiment to obtain PD-signal and sometimes become critical breakdown as a result to damage measurement device. While the PD-location detection results from the second electrode found that it can be easily simulated PD signal. The PD-location result has a better precision or has statistical data to detect PD-location explicitly. Therefore, this special designed electrode could be applied for PD detection study in power transformer or other electrical equipment as well.