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MTO300 Series - six-winding transformer ohmmeters

MTO300 Series - six-winding transformer ohmmeters

MTO330 transformer ohmmeter

Megger MTO300 series transformer ohmmeters measure all six windings of a three-phase transformer automatically without changing connections. With test current capability up to 10 A, they provide simultaneous winding magnetisation to ensure fast, accurate results, and auto-demagnetisation after test. And, by sharing the same lead set as Megger TTR turns ratio testers, they make transformer testing even more convenient.

Selected features and benefits

  • Automated, eight-terminal/six-winding measurement capability - saves time and money by testing all windings in one test sequence, which means big reductions in disconnect/reconnect time and "ladder time".
  • Simultaneous winding magnetisation - allows MTO300 series instruments to deliver reliable results fast, even on large transformers.
  • Got a Megger TTR300 turns ratio tester? - The leads are the same as the MTO300 series. Connect once to test both turns ratio and resistance.
  • On-load tap-changer testing - continuous operation with graphical display of winding resistance per tap, and test current change detection.
  • Auto-demagnetisation feature - removes residual magnetisation of the transformer core after testing, making the transformer ready for SFRA or excitation tests, or for return to service.
  • Automatic discharge for safety - active circuitry monitors both current and voltage leads to ensure safe discharge of the transformer after test, even if the power is lost.
  • PowerDB compatibility - store, organise and archive your test data, and produce reports quickly and easily in almost any format.
  • Two models to suit all users - The MTO300 is controlled by PowerDB software on an external PC while the MTO330 has its own on-board computer, keyboard and display.

Got any questions about the industry's first six-winding transformer ohmmeters?

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