Portable on-line partial discharge measurement and monitoring system

Reliable indicator of insulation condition

Partial discharge (PD) activity is a reliable indicator of insulation condition, and it is often a sign of insulation defects that can cause failure in electrical assets. On-line PD measurement evaluates PD activity and offers a snapshot of insulation condition status when the asset is in operation. Temporary on-line PD monitoring indicates changes in PD activity over specified periods of time during an asset’s service life.

Key Features

  • Two-in-one solution for on-line PD measurement and temporary PD monitoring
  • Compact and lightweight for easy transport
  • Designed for indoor and outdoor use
  • Built-in computer for continuous, long-term data collection and archival
  • Web-based interface for convenient remote setup and data access
  • Automated software features for user-friendly data analysis and reporting

Remote Data Access

A built-in computer enables long-term data collection and archival. You can remotely access the computer and collected data with the web interface. You can also set up the system to send email alarm notifications when PD levels exceed user-defined thresholds.

User Friendly Analysis

Automatic software features, such as 3PARD (3-Phase Amplitude Relation Diagram) and Automatic Cluster Separation, separate noise from PD signals to help you easily and reliably determine the signal source.

Plug-and-play setup

The on-line PD measurement and monitoring device can be easily connected via a terminal box to permanently-installed partial discharge sensors. This enables quick and safe plug-and-play connections during setup without having to shut down the asset.

Convenient 2-in-1 solution

MONTESTO 200 is a portable, two-in-one solution that enables you to perform both on-line partial discharge (PD) measurements and temporary on-line PD monitoring: It can be used on various medium-voltage and high-voltage electrical assets under load to assess insulation condition. You can use the IP65 rated MONTESTO 200 both indoors and outdoors. Automated software features enable users to quickly and reliably identify and locate signal source.


On-line partial discharge measurements:

    • Clarify asset insulation issues within the warranty period
    • Periodically check asset insulation condition state
    • Identify assets that require immediate intervention

Temporary on-line partial discharge monitoring:

    • Observe assets at risk over extended periods of time
    • Identify assets that require permanent monitoring
    • Plan maintenance and investment based on asset condition


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