Bus Trac


Continuous On-Line Partial Discharge Monitoring for Turbine Generators


The BusTrac System consists of permanently installed capacitive couplers (2 per phase), a dedicated BusTrac instrument, a system controller, plus digital communication to continuously monitor stator winding partial discharge (PD) activity.

Facilities that have existing bus coupler installations can easily install the BusTrac monitor by connecting the instrument to the existing coupler termination panel. The install of the BusTrac monitor does not require an outage. Iris Power field service specialists can install and/or commission your BusTrac instrument so that alarm trigger levels, and condition based measurement triggers, are set to the best levels for that particular machine.

The BusTrac monitor offers a multitude of communication options. The monitor(s) can be wired via direct serial cable to the front panel RS232 connector. As an option, the BusTrac can also be remotely accessed when wired with an RS485 (copper or fibre), or Ethernet via an external terminal server. 


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Product Description

New users of the BusTrac monitor technology must first permanently  install 80pF capacitive couplers during a suitable machine outage.  The BusTrac instrument is the product of Iris Power’s many years of experience developing on-line PD measuring systems for high voltage motors, turbine generators, and hydro generators. Like its predecessors, the BusTrac monitor includes the unique methods specifically designed to overcome the electrical interference that is typical of most power plant environments. This ensures reliable and repeatable test results with a low risk of false indications. The test data can be easily interpreted by maintenance professionals after participating in a two-day training seminar, offered by our experienced staff. Since the instrument is fully compatible with all previous generations of the TGA-B technology, maintenance personnel can use the historical data to make a seamless comparison of similar machines. This assessment is enhanced through the use of the growing Iris Power database of over 140,000 test results.

The BusTrac monitor is supplied with a termination panel that contains a multiplexor allowing the sequential monitoring of up to 6 pairs of couplers (up to 9 couplers in cross-compound generators). The instrument can be set up to run in one of two modes:

1. Controlled Mode:

The BusTrac monitor is triggered either through the front panel keypad, or remotely (with networking option) using a host computer running the TracCon™ controlling software. The test results can be viewed immediately and analyzed using PDView™ display and trending software.

2. Autonomous Mode:

The BusTrac monitor collects data continuously, several times an hour, and archives the Qm and NQN results which are important for trending and comparing similar  motors or turbine generators. The data for the day and the month is summarized and archived for up to two years. It can be downloaded through a local RS232 port to a laptop computer or remotely (with networking option) using TracLinkTM software. Although both modes are mutually exclusive, users can switch back and forth between them.


  • Sophisticated monitoring and analysis system reduces false indications by digitally separating partial discharges from electrical noise, on a pulse-by-pulse basis.
  • Proven filtering and pattern recognition enhances noise separation, allowing for a reliable and objective detection of poor impregnation, overheated windings, coil movement in the slot, ineffective or deteriorating grading/semi-conductive material problems and
  • contamination.
  • The system’s compatibility with the Iris Power TGA-BTM technology allows users with existing sensor installations to commission the system without an additional outage. Data can be easily confirmed and further analyzed with Iris Power’s TGA-B portable instrument.
  • Ensures a consistent testing interval, thereby improving the quality of the trends. The alarm output permits maintenance personnel to focus
  • on machines that exhibit unusual or high levels of partial discharge activity. This is attained by increasing testing frequency and by using the Controlled mode to generate plots that help to identify the prevailing failure mechanism of stator winding insulation.


  • Analog Signal Output Module (ASOM): This option allows the Trac instrument to generate analog output signal levels, which are
  • proportional to the NQN and Qm partial discharge summary numbers. These signals can then be fed into a plant acquisition system where they can be trended and stored. Utilizing this option allows the Trac instrument to be treated like any other field sensor and allows PD data display, alarming, and trending to be integrated with other plant monitoring systems under an interface familiar to plant personnel.
  • Remote modes of communication permit command, control and configuration from a distance. For example, the key trending parameters can be transmitted to a SCADA system, and correlated with operating parameters such as turbo generator load and temperature for enhanced analysis of stator winding problems.
  • Networking adds a RS485 port for remote communication to a remote computer using TracCon software.

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DISCLAIMER: The technical information contained herein is the result of extensive testing in the manufacturer’s laboratories. In addition any application advice given verbally, in writing or by testing corresponds to the best of our knowledge and belief. Since the use and application of any of our products lies beyond our area of control, it remains the responsibility of the user to verify the product’s suitability for their application.

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