Further experience in the use of existing RTDs in windings of motors generators for the measurement of partial discharges

Over six years has passed since the use of the RTDs embedded in motor and generator windings as a sensor to detect partial discharges (PD) was introduced. Over this period of time, thousands of measurements utilizing RTDs have been made. This coupled with the refinement of measurement techniques and sensor technologies has validated this approach. Use of the existing embedded RTDs in conjunction with traditional sensors, such as coupling capacitors at the line terminals, will greatly improve the diagnostics capabilities of insulation systems in rotating equipment. Methodologies and numerous examples will be presented while addressing the strengths and limitations of this technology.