Model AWRMS 200

• Currents up to 200A for performing Winding
Resistance and Heat Run Tests.
• Heavy Duty Protection Circuit.
• Accuracy with Four Wire Measurements 0.1% of
reading + 1μΩ.
• Accurate Liquid and Surface Temperature
Measurements, 14 inputs for PT100s/RTDs and 6
• Two Current Leads and Three Sets of Potential
• User Friendly Software with Auto & Manual.

Features & Benefits


The AWRMS™ 200 is a computer controlled test system developed for measuring Transformer Resistance and for
performing Heat Run Tests in highly inductive loads. A single source with a 100V DC test voltage is used to saturate even
the largest transformer within seconds. A heavy-duty protection circuit dissipates the stored magnetic energy rapidly after
the test. An automatic Tap Changer speeds up the measurement of all the windings. Optimum accuracy for the resistance
measurements is achieved using the four-wire principle of resistance measurement.
The AWRMS™ 200 is capable of measuring the resistance of up to three windings connected n series simultaneously. The
DC of the 25kW supply is continuously adjustable up to 200A for testing windings in large transformers, electric
motors, generators, and reactors.
Up to 40 temperature channels consisting of PT100s or Thermocouples can be supplied.

The AWRMS™ system is primarily used for:
• Transformer and Rotating Machinery Manufacturers.
• Power Utilities.
• Electric Contractors.
• Govt. and Private Labs, and Service or Maintenance Companies.

The AWRMS™ 200 is capable of the testing both three-phase (Y-Wye, Δ-Delta, or Mixed) and single-phase power
subsystems [(VA to MVA); (fractional HP to kHP or W to MW)]:
• Electric Motors, Generators, and Reactors.
• Busbar Contacts & Joints and Bushings.
• Power Cables, Relays, and Circuit Breakers.

The AWRMS™ 200 can be used in either stand-alone or conjunction with the MIL series of AccuLoss™ Loss
Measurement Systems. The system is capable of performing both cold and hot resistance measurements on
winding resistance.
Built into a steel enclosure on wheels the AWRMS™ 200 can be moved about easily and effortlessly. Two
current cables and six potential cables are available for connection to the UUT. Standard cable length is 20m.
Cables up to 30m and longer are available at time of order. The current and potential cables are supplied
with clips (insulated and color coded for each channel) for easy connection to the poles of the transformer
(UUT). Additional c ables are available as an op tion.
14 PT100’s and six thermocouples come standard with optional expandability for up to 40 for measuring both
oil and case temperatures. At the time of order, you can choose your configuration of either oil or case
All measurements are fully automatic and require no adjustments. The measurements are performed in
accordance with the IEEE, IEC and other International standards.
Several safety circuits are built into the AWRMS™ 200 including overvoltage protection on the output of the
DC Power Supply.

Measurement Capabilities:
A source compliance of up to 100 VDC @ 250A (continuously variable) is used for measuring the winding
resistance. The hot resistance is automatically temperature compensated for copper and aluminum windings
(using a standard or customized reference temperature).

System Accuracy:
4-Wire Measurement Technique allows the use of long measurement leads for measuring the winding
resistance without sacrificing accuracy. (See the System Specifications at the end).
Operating Convenience:
The system is computer controlled and fully automated for all measurements. There is no manual intervention
required when operating in the Auto Mode.

Exceptional Reliability:
The components used in the AWRMS™ 200 are of the highest quality, and designed and manufactured for a
rugged environment.

The AWRMS™ 200 Software provided with the system is written in LabVIEW™. The test results are outputted
in a tabular format to an ASCII file for easy importing to an Excel spreadsheets. Upon turning the system
software on, a built in self diagnostic routine scans each instrument for functionality.

AWRMS™ 200 Software Features:
User friendly program for hot and c old Resistance measurements.
The program offers Auto and Manual Modes and flexibility for customization.
Hot Resistance Software outputs temperature rise or cooling curve results in either graphical or tabular form.
All results in ASCII file c an easily be c onverted to Word, PDF, HTML , XML , CSV, etc.


See data sheet for specifications