Portable PD Monitor



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Portable Partial Discharge Monitoring

The ASM-P is a Portable PD Monitor for cables, switchgear and other high voltage assets. The unit is part of the IPEC’s wider range of on-line Partial Discharge monitoring systems.

The ASM-P can be configured with up to 32 PD sensor channels. If excessive discharge is detected, the ASM-P raises an alarm that can be configured either locally or by email. This enables the long-term assessment of plant conditions to be carried out quickly and easily, from any remote computer.


Web Based Data Analysis

Partial discharge data is automatically collected from the ASM-P and is stored on a central database and is hosted by IPEC. Customers have direct password-protected access to this data via the Internet, allowing them to browse the data and analyse plant condition from any PC.

Condition information presented like this can be used for targeting scheduled maintenance work before the failure happens, improving network reliability and prioritising asset replacement.

Based on the magnitude of activity levels recorded and the trend in that activity, a ‘League Table’ is automatically generated once every 24 hours. This table gives a clear and quantitative representation of the condition of monitored high voltage assets at any given moment.


The PD Data Analysis page allows signals from any channel to be analysed. Data can be selected over any period and signals resolved in phase viewed. The analysis has the following features:

  • PD Peak, PD Count, Load, Asset Criticality and Analogues plotted against time
  • Any time period selectable
  • Up to 8 channels selectable at one time
  • Multiple thresholds for count between 5mV and 100mV
  • Data Averaging and Noise Reduction functions
  • Rectified/Bi-polar graphs
  • Phase resolved PD data in linear/polar representation
  • Cumulative Count data
  • Time of Day analysis


Partial Discharge Sensors

Sensors are distributed around the substation according to the monitoring requirements. Both active (with integral amplifiers) and passive transducers are compatible including the following:

  • High Frequency CTs – for cable PD detections
  • Capacitively Coupled – for TEV (Switchgear) PD detection
  • Airborne Acoustic – for Surface tracking or corona
  • Temperature and Humidity – environment measurements
  • Up to 32 sensors can be monitored by a single ASM-P.