Atec WRM-10 User Manual
WRM-10
lightweight winding resistance meter
ightweight winding resistance mete
Vanguard Instruments Company, Inc.
www.vanguard-instruments.com
WRM-10
Tin
fla
t
lightweight winding resistance meter
The WRM-10 is 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-10 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.
outstanding features
• Auto discharge circuit for operator safety
• Auto current ranging from 10 mA to 10 A
• Digital resistance reading from 1 micro-ohm to
2,000 ohms
• Lightweight (27 lbs / 12.2 kg)
WRM-10 connections
Since the WRM-10 can accurately measure resistances ranging from 1 microohm to 2,000 ohms, it can also be used
to measure EHV circuit-breaker contact
resistance, motor winding resistance, or
any low resistance. In addition to measuring the resistance value, the WRM-10
also checks the “make-before-break”
tapswitching sequences of voltage regulators and load tap changers.
The WRM-10 is furnished with three 50foot test cables. Each test cable lead is
terminated with a quick-disconnect test
clip.
Built-in Safety Features
At the end of each test, the WRM-10 automatically dissipates the stored energy in the transformer. 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-10 features a back-lit LCD screen (16
characters by 2 lines) that is viewable in both
bright sunlight and low-light levels. A “turn-andpush” knob is used to control the unit. A built-in
RS-232C interface port is provided for diagnostic testing and fi rmware upgrades.
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