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WRM-10P S2 USER’S MANUAL REV 1.0
2
1.0 INTRODUCTION
1.1 General Description and Features
The WRM-10P S2 is Vanguard's second generation lightweight winding resistance meter,
designed to accurately measure the winding resistance of highly inductive power transformers.
The unit’s dual resistance-reading input channels can measure two winding resistances
simultaneously, and four-wire (Kelvin) connections provide high accuracy and require no lead
compensation. The WRM-10P S2 provides stable resistance readings of very large transformers
by utilizing a 36Vdc power supply capable of outputting up to 10 Amperes. The resistance
reading of a 100MVA transformer can be achieved in 5 minutes or less. The unit’s power supply
is cooled by heavy-duty fans designed for continuous operation. For greater flexibility in the
field, the WRM-10P S2 comes with a built-in 2.5" wide thermal printer used for printing test
reports.
The WRM-10P S2 can also be used to measure EHV circuit-breaker contact resistance, motor
winding resistance, or any low resistance since it can accurately measure resistances ranging
from 1 micro-ohm to 2,000 ohms. If the transformer winding temperature is entered, the
WRM-10P S2 can calculate the equivalent resistance value of the winding material (aluminum
or copper) at any standard reference temperature. Also, a special test mode can run a test for
up to 60 minutes while saving resistance readings at 10, 15, 20, 30, or 60 second intervals. In
addition to measuring the resistance value, the WRM-10P S2 also checks the “make-before-
break” tap-switching sequences of voltage regulators and load tap changers.
The WRM-10P S2 is furnished with three 50-foot test cables. Each test cable lead is terminated
with a quick-disconnect test clip.
Built-in Safety Features
The WRM-10P S2 automatically dissipates the stored energy in the transformer at the end of
each test. This discharge circuit will continue to work even if the supply voltage is lost. For
added safety, the unit’s power supply is thermally protected from over-load damage.
User Interface
The WRM-10P S2 features a 5" back-lit LCD screen (240 x 128 pixels) that is viewable in bright
sunlight and low-light levels. A rugged, "QWERTY"-style, membrane keyboard is used to control
the unit.
Built-in Thermal Printer
The WRM-10P S2 features a built-in 2.5” wide thermal printer that can be used to print test
reports in the field.