Partial Discharge Signals Detecting and Preventive Maintenance Planning for 21 kV Generator Case Study of a Generator at the Combined cycle Power Plant of Ratchaburi Power Company Limited

This paper presents a method for detecting and analyzing of partial discharge signals in 21 kV generator for preventive maintenance planning. This study were performed at the combined cycle power plant of Ratchaburi Power Co., Ltd., where the generator has installed the partial discharge sensors. The signals were measured and collected using a high speed oscilloscope module with data acquisition. The data is analyzed and compared with the results obtained from the standard instrument Turbine Generator Analyzer - Bus Coupler, TGA-B. As the results, it is found that the partial discharge signals can be captured with the proposed method and the analyzed results tend to be the same as results obtained from the standard instrument. After maintenance processes, the problem was resolved to confirm that, the PD signals were analyzed correctly.