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Online Partial Discharge Testing and Monitoring Made Easy

October 09, 2025

Our enhanced Terminal Box offers you safe and easy online access to your electrical assets for partial discharge testing and monitoring. It connects our PD measurement and monitoring devices with our permanently installed PD sensors when electrical assets, such as rotating machines, cable terminations and joints, and power transformers, are in operation.

One-time installations

Both the PD sensors and the Terminal Box are installed and connected during a routine maintenance outage. After that, electrical assets can remain in service when PD testing and monitoring devices are connected for online trending and diagnosis of detected PD activity.

Plug-and-play connections

As a result, unnecessary downtime can be avoided, operator safety is ensured, and electrical assets can be evaluated under typical operating conditions. The plug-and-play connections enable you to easily switch between continuous online PD monitoring for trending PD activity in electrical assets and online PD measurement for more detailed diagnosis of potential insulation degradation and defects.

Interested in this topic?

Be sure to listen to our Energy Talks podcast episode #110 to discover how you can safely access your electrical assets while they are in operation for online PD testing and monitoring with a terminal box.