TGA – Partial Discharge Monitoring

Periodic Online Partial Discharge Monitoring

Product Overview

The TGA is the leading portable instrument to monitor partial discharge in motors, turbine generators, switchgear, dry type transformers and isolated phase bus.

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Works with the Following Assets
Assists with the Following Type of Monitoring

Iris Power uses the TGA to periodically collect voltage pulse data through 80pF Iris Power Epoxy Mica Capacitors on Turbo Generators, critical motors, dry type transformers, switchgear and isolated phase bus.  The data is analyzed using PDView diagnostic software to provide information need to avoid catastrophic failures, extending the life your asset and reducing the risk of unplanned outages.

The most common method of monitoring motors and turbine generators involves using the Iris Power TGA-B or TGA-S portable instrument with multiple sets of permanently installed sensors (EMC or SSC). The instrument is controlled by means of a computer and includes Windows™-based control and data display software.

All data analysis results automatically output from PDView provide information need to understand the severity and location of:

  • Insulation abrasion
  • Loose stator wedges
  • Thermal degradation of stator insulation
  • Manufacturing defects of stator bars

Product Details



  • Connect with up to 6 permanently installed Iris Power 80pF Epoxy Mica Capacitors (EMC)
  • Operates on machines with either 50Hz or 60Hz power frequency

Data Analysis

  • Sophisticated monitoring and analysis system prevents false indications by digitally separating partial discharges from electrical noise, on a pulse-by-pulse basis.
  • Proven filtering algorithms enhances noise separation to allowing for a reliable and objective detection of stator winding problems such as  poor impregnation, overheated windings, coil movement in the slot, ineffective or deteriorating grading / semi-conductive material problems, and  contamination.
  • In response to a partial discharge alert, users can review the pulse height analysis plots, and the 32-window phase resolved partial discharge plots using basic interpretation to confirm the cause of the alert
  • PDView software performs automatic assessment and displays alerts to when high partial discharge conditions are detected.


Data Acquisition

  • Low frequency option  for offline testing with one portable 16 kV coupler
  • Low frequency option for offline testing with one portable 25 kV coupler
  • Optional configuration to measure partial discharges on up to 12 EMC couplers for hydro generators (TGA-BP)
  • Optional configuration to measure partial discharges on up to 6 Iris Power Stator Slot Couplers (SSCs) for larger turbo generators (TGA-SB)
  • VFD Monitoring Kit which includes a reference circuit and capacitive divider assembly to allow partial discharge monitoring on motors with VFD drives operating between 20 Hz to 120 Hz

Get a Quote

Call us at +1 905.677.4824 or Toll Free at +1 888-873-4747 or fill out our online quote form below.

Learning Center

This Resource Library is designed to provide current, relevant resources that provide technical knowledge and practical solutions for owners and operators of rotating machines. We encourage you to use the search feature and filters to locate specific resources of interest.


Articles, Technical Papers, & Case Studies

Stator End-Winding Vibration in Two-Pole Machines – Avoiding Generator Failure

IN THE PAST 15 YEARS, INSURANCE INDUSTRY DATA HAVE indicated that stator end-winding vibration has become the most important ...



Hands-on, practical experience

EL CID Training | Electromagnetic Core Imperfection Detection – October 1-3, 2024 – Iris Power, Toronto, Canada

Reasons to Take The Course Mechanical, electrical and environmental stresses can cause a breakdown in the inter-laminar insulation on Stator Core…


IRMC 2024 June 17-20, 2024 - Renaissance Las Vegas, Las Vegas NV

IRMC 2024

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