OMICRON Magazine

What is the difference between offline and online PD testing? PD can be measured offline, such as with our MPD 800 PD measurement and analysis system. In this case, the asset is energized by a separate HV source. PD can also be measured or monitored online while the asset is connected to the electrical grid and in operation – either with the MPD 800 or our MONTESTO 200 temporary PD monitoring system – using permanently-installed PD sensors and a terminal box. Please explain what PD monitoring means and how it differs from online PD testing. Online PD monitoring is the process of continuously observing and trending partial discharge activity over time to assess insulation condition, identify potential weak spots, and determine the level of risk for a dielectric failure. The information from the PD sensors is synchronously measured by the multichannel acquisition unit and stored in a database. The measurement synchronicity between the channels enables the separation of noise and PD signals. The data is trended over the specified time period and compared with user-defined thresholds to determine whether a problem is developing. When it comes to temporary PD monitoring, an online PD measurement is continuously performed over a few days, a week, a month, or even a year to obtain a more detailed picture of progressive deterioration in the electrical insulation. Compared to periodic PD measurements, temporary PD monitoring allows you to observe the behavior of different PD defects over time and how they relate to different operating parameters, such as temperature, load, and humidity. It is performed to evaluate the overall insulation condition on assets with confirmed PD activity to «The data is trended over the specified time period and compared with user-defined thresholds to determine whether a problem is developing.» Bogdan Gorgan, Product Manager, OMICRON LISTEN TO THE PODCAST Interested in this topic? Be sure to listen to our Energy Talks Podcast Series Episode Number 38 about the temporary monitoring of partial discharge activity with Bogdan Gorgan. Scan the QR-Code or visit: omicronenergy.com/temporary-pd 33

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