Vanguard Instruments TRM-203 VAN-TRM-203 Three Phase 20A, Winding Resistance Meter with Auto
The TRM-203 is a three phase transformer winding resistance meter that
allows the user to connect all test cables to the transformer bushings. The
unit will then measure the transformer resistance value for each of the phases
without the need to disconnect and reconnect cables for each phase.
The TRM-203 can provide a fast and stable reading 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.
Since the unit can accurately measure resistance from 1 micro-ohm to 2000 Ohms
it can be used as micro-ohm meters to measure EHV circuit breaker contact
resistance, or for any low resistance measuring application.
o Perform three phase test on a transformer without the need to switch cables
o Can provide individual Delta winding resistance values
o Can provide individual Wye (with no neutral) winding resistance values
o Demagnetize transformer after test
o Selectable test current from 1A to 20A (TRM-203) and 1A to 40A (TRM-403)
o Computer-control via RS-232C, USB, or bluetooth interface
o Built-in 2.5" wide thermal printer
The TRM-203/403 can be connected to a PC via the unit's RS-232C, USB, or
Bluetooth interface. A PC can be used to control the TRM-203/403
to perform transformer resistance tests. Test records (stored in the
TRM-203/403 or a USB Flash drive) can also be retrieved, reviewed, and
printed. Test records are automatically exported to PDF, Excel, and XML
The TRM-203/403 automatically dissipates the energy stored in the transformer
at the end of each test. The discharge circuit will continue to work even if
the TRM-203/403 power supply is lost.
Test Record Storage:
The TRM-203/403 can store up to 256 static test records (111 tests per record)
and 120 dynamic test records internally. For external test record storage, the
TRM-203/403 features a USB Flash drive interface port. Up to 999 test records
can be stored on a connected USB Flash Drive.