Power Transformer Guard
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Power Transformer Guard (PTG)

    The Power Transformer Guard (PTG) is designed to monitor oil-filled power transformers in order to extract a signature of its condition. Without such Condition Monitoring (CM) ability it is difficult to know when your transformer needs to be serviced or replaced . The PTG measures vibration in the frequency range of 20-1,000 Hz to display the various components of the vibration. The largest vibration comes from windings/coils whose shape is lost as a consequence of excessive vibration. An excessive amplitude leads to play in the coils. Existing play allows large amplitude vibration, which in turn reinforces the play. It is a vicious cycle if left unchecked. At worse, a total breakdown of your transformer will happen resulting in catastrophic failure. 

    Adopting PT Guard is the key to a robust system. It provides long term monitoring of your transformer behavior and the ability to react before catastrophic failure leads to increased expenses. 

    Due to the strong magnetic environment and high temperature, regular sensors cannot be located close to the winding as they are monitoring internal vibration behavior from outside the tank walls. This is a problem as undesirable signals (e.g. from internal echoing) will mix with the desired signal and will be significantly dampened.
PTG sensors are 2 mm thin, resistant to high temperature, immune to EMI and high voltages and are designed to be installed inside the tank between the winding turns and submerged in the cooling oil.


Key Features

  • Broadband sensor working from 20 Hz to 1,000 Hz.
  • 8-channel system for both temperature and vibration.
  • Channel #1 is dedicated to temperature measurement winding top.
  • Calibrated to industry standard: 10 microns per 100 mV at 159.2 Hz.
  • ​Vibration signature enables identifying troublemakers for the whole range between 20 Hz and 1,000 Hz.
  • ​Immune to EMI and high voltages.
  • ​Fiber optic making the VibroFibre spouses Telcordia standard.
  • ​Signal Conditioner possesses an analog electrical output for direct measurement. 
  • ​A SCADA device can be linked to the Signal Conditioner as it also outputs RS-485 Modbus signal.
  • The signal conditioner allows portability and thus capacity of evaluating a whole fleet of motors, further increasing the cost effectiveness of the system.
  • An User Interface is provided for both on-line evaluation (PT EYE) and off-line trending (PT SAFE).
  • The PT Guard system can be extended to other types of assets and conditions.
Graphical User Interface 
(Appended PTG Software)

PT EYE 

   PT EYE is an online software service enabling the user to observe measurements in real-time. Displayed are the time and frequency domains, and temperature as well. Plus, data can be stored for long term independent monitoring for the sake of trending the signature using PT SAFE software service. 

PT SAFE

​   Offline software service trending the saved data from its online counterpart. Long term behavior of your induction motor becomes apparent.

​An integrated system with dual ability to measure both vibration and temperature for the purpose of extending your asset lifetime.

        Our first installation of Transformer Guard system
in China (Xi'an).