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Vanguard TRM-203 / TRM-403 Transformer Resistance Meters

TRM-203 / TRM-403

TRM-203 / TRM-403 Transformer Resistance Meters

The TRM-203 and TRM-403 are three phase transformer winding resistance meters that allow the user to connect all test cables to the transformer bushings. The unit will then measure the transformers resistance value for each of.

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M2K engineers testing a distribution transformer with Vanguard instruments at Energypac

Overview

The TRM-203 and TRM-403 are three phase transformer winding resistance meters that allow the user to connect all test cables to the transformer bushings. The unit will then measure the transformers resistance value for each of the phases without the need to disconnect and reconnect cables for each phase. The TRM-203/403 can provide fast and stable readings of very large transformers by utilizing a 60Vdc power supply. The TRM-203 is capable of outputting a selectable test current from 1A to 20A while the TRM-403's.

Since both units can accurately measure resistance from 1 micro-ohm to 500 Ohms (up to 2000 Ohms for the TRM-203), they can be used as micro-ohmmeters to measure EHV circuit breaker contact resistance, or for any low resistance measuring application. For a Delta transformer, the TRM-203/403 can measure the phase resistance readings and provide the individual Delta winding resistance values. The TRM-203/403 can also provide the individual winding resistance values for a Wye transformer without the neutral terminal..

All test results can be printed on the unit's built-in 2.5" wide thermal printer. Test record header information including the Company, substation name, transformer information, and operator name can also be entered. The TRM-203/403 can automatically demagnetize the inductive device under test, eliminating the manual task of demagnetizing the transformer core after a resistance test. The TRM-203/403 also has a "make-before-break" test mode that can be used to test the Load Tap Changer (LTC) of Voltage Regulator.

Key capabilities

  • Perform three phase test on a transformer without the need to switch
  • Can provide individual Delta winding
  • Can provide individual Wye (with no
  • Demagnetize transformer after test
  • Selectable test current from 1A to 20A
  • Computer control via RS-232C, USB, or

Specification

Indicative specification for Vanguard TRM-203 / TRM-403 Transformer Resistance Meters

Indicative specification for guidance. Confirm the current manufacturer datasheet for the configuration being quoted.

Typical applications

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