Sharif Digital Repository

One of the electromagnetic methods for partial discharge detection is known as UHF detection. In this method the electromagnetic radiations from PD sources over a wide frequency band of UHF are detected and the related spectrums over the UHF frequency band are captured for diagnostic. The absence of noise in UHF band (300 MHz- 3GHz) is the most important advantage of this method if compared with other electrical PD detection methods. To capture electromagnetic signals and radiations generated by PD sources, application of an electromagnetic sensor, named antenna, is necessary. Therefore one of the goals in this thesis is to select, design, and build a suitable antenna for PD detection.... 

Partial discharges that occur in a transformer insulation, generate current pulses. If these pulses be recorded, they can be used for transformer insulation condition assessment. Through processing of these recorded partial discharge signals, the PRPD patterns are generated and used to identify the source type of partial discharge defect. If multiple partial discharge defects exist in a transformer insulation, the related PRPD pattern, doesn’t look like any PRPD patterns of single defects. In this case, we need in the first step to discriminate the partial discharge signals stemmed from all the existing multiple partial discharge sources. To simulate the occurrence of multiple partial...