| Title |
An internal partial discharge measurement method excepted an external corona noise |
| Authors |
Dong-Jin Kweon ; Sang-Bum Chin ; Hee-Ro Kwak |
| Abstract |
The largest problem in applying the electrical partial discharge measurement method to the transformer that has been operated until now is the removal of external corona noise. In this thesis, a method was studied to measure only the partial discharge signal due to the defect in transformer except the external corona noise. To find out the types of partial discharge and corona noise within a transformer, a partial discharge was made in use of a needle-plane electrodes within a model transformer and, at the same time, an external corona noise was generated in use of a rod-sphere electrodes in the air around the transformer. Both of a partial discharge signal caused from an internal defect within a transformer and an external noise were found at the rogowski coil which was located at transformer earth wire. When the external corona noise, which was separately measured in use of an antenna sensor out of transformer, was removed from the signal measured on rogowski coil, the signal caused by partial discharge within a transformer would effectively be acquired. |