Perform Three Phase Test on Transformers with the Vanguard TRM-403

vanguard_trm-403A three phase transformer winding resistance meter, the Vanguard TRM-403 Transformer Resistance Meter will measure the resistance value for each of the phases without the need to disconnect and reconnect cables for each phase, and can provide a fast and stable reading of very large transformers by utilizing a 60Vdc power supply.

The Vanguard TRM-403 also has a “make-before break” test mode that can be used to test the Load Tap Changer (LTC) or Voltage Regulator contact test sequence, and produces a “Dynamic-Resistance” graph of the LTC or Voltage regulator contact under operation.

The TRM’s built-in LTC/Voltage regulator can be used to conveniently change the LTC/voltage regulator tap position from the Vanguard TRM-403 front panel.

Vanguard TRM-403 features:

  • Perform three phase test on transformers without the need to switch cables
  • Can provide individual Delta winding resistance values
  • Can provide individual Wye (with no neutral) winding resistance values
  • Demagnetize transformer after test
  • Selectable test current from 1A to 20A (TRM-203) and 1A to 40A (TRM-403)
  • Computer-control via RS-232C, USB, or bluetooth interface
  • Built-in 2.5″ wide thermal printer

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