Tap Changer Analyzer & Winding Ohmmeter RMO40TT


The list of the instrument application includes:

  • On-load tap changer dynamic resistance measurement
  • Three resistance measurement channels
  • Six temperature measurement channels
  • Automatic resistance/temperature measurement for the Heat Run test
  • Rapid automatic demagnetization
  • Tap changer motor current monitoring channel
  • Automatic discharge circuit
  • Built-in tap changer control unit

The Tap Changer Analyzer & Winding Ohmmeter RMO40TT instrument is designed for winding resistance measurement of inductive objects, and for a tap changer analysis. The RMO40TT instrument is based on the state of the art technology, using the most advanced switch mode technology available today. The RMO40TT instrument is accurate (0,1%), powerful (up to 40 A) and lightweight (13,0 kg / 28.7 lbs). It generates a true DC ripple free current with automatically regulated measurement and discharging circuit.
RMO40TT instrument can perform a simple, quick and reliable transformer on-load tap changer condition assessment. This instrument enables measurements of a winding resistance in every tap position, current ripple values (percentage of a current drop during a tap change) and transition times during the tap changes. Problems with a connection, contacts, and selector/diverter switch operation (tap change with interruption) can be detected with these measurements.


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