Condition based maintenance has emerged as a priority issue in modern power systems, and has reminded so for last several decades. Appropriate monitoring and diagnosis before severe faults occur make it possible to control and operate power systems in a more reliable, effective, and sustainable way. Compared other monitoring techniques, Partial Discharge (PD) monitoring seems the most promising methodology for detecting possible dielectric breakdown, aging and ultimately faults in power system components. In order to maximize the benefits of PD monitoring, proper sensing, de-noising and interpretation of its PD signal is of importance.
On-line PD monitoring of power system apparatus is a very promising technique that has arisen in the field of condition based maintenance to assist in robust monitoring system which reduces outage time of the power system. For that reason, it is a priority to organize and make a holistic review of current on-line PD monitoring techniques of power system components in order to understand recent developments and trends in theory and in practice. Therefore this thesis is an intensive literature review of current on-line PD monitoring technology.
