Computer Controlled Test System for 3 & 1 Phase
• Power Transformers & Reactors
• Auto Measure feature for performing sequential
• measurements of the Vector Group Detection,
• Ratio and Resistance with automatic tap changer.
• Accurate Liquid & Surface Temperature
• Measurement (20 Channels of 4 Wire) & Monitoring
• Unmatched Speed, Range, & Accuracy and 4 Wire
• Measurements for all Tests
• Heavy Duty & Safe Discharge Circuit
GENERAL INFO. & MAIN BENEFITS:
The AWRMS 50 is a computer controlled dual source test system for Vector Group Detection, Ratio and Resistance
Measurements on medium and large transformers. The maximum current is 50A. The AWRMS 50 was developed
as a fully automated system using one set of cables for Hot and Cold Resistance, Ratio and Heat Run Tests with an
automatic tap changer capability. Only one set of connections has to be made to support all the measurements. The
software controls, measures and supervises all the measurements.
The AWRMS 200 is a computer controlled single source test system developed for Resistance Measurements and
Heat Run Tests with an automatic tap changer, the maximum current being 250A.
Up to 20 temperature channels are available on each model.
The AWRMS™ 50 is a very versatile, most accurate, best performing, low cost system on the market, today!
For higher currents see our AWRMS 200.
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™ 50 is capable of the testing both the three-phase (Y-Wye, Δ-Delta, or Mixed) and the singlephase
power subsystems [(VA to MVA); (fractional HP to kHP or W to MW)]:
• Power and Distribution Transformers [(PTs & Ts) with / without onlo ad tap changer (OLTC)].
• Electric Motors, Generators, and Reactors.
• Busbar Contacts & Joints and Bushings.
• Power Cables, Relays, and Circuit Breakers.
The AWRMS™ 50 can be used standalone or in conjunction with the MIL’s series of AccuLoss™ Loss Measurement
Systems. The standard system is capable of performing all measurements in one set up including checking the
vector group, ratio and resistance and features an automatic tap changer. Twelve PT100’s come standard with
expendability up to 40 for measuring oil and case temperatures. There is no need to intervene saving time
and money. All measurements are performed in accordance to the IEEE and other International Standards
(ANSI, IEC, NEMA, & VDE).
Built into a tough steel enclosure on heavy-duty castors, the system can be moved about easily. Long, current-,
potential-, and tempe rature- measurement cables (up to 30m) are supplied.
Seven current cables (3 each for the high and low side and 1 for the high side neutral) and eight potential
cables (4 each for the high and low side including the neutral) are available for connection to a three phase
transformer (usage of the neutral cables are optional). Single phase transformers require only four current
cables (2 from each side). Current and potential cables have clamps (insulated & color coded for each phase)
for easy clipping to the poles of a transformer (UUT).
The same cables are used for both the winding- resistance and ratio measurements. Current and voltage are
selected on the two power supplies automatically.
Source compliance of up to 60 VDC @ 50A (continuously variable) is used for cold resistance measurements.
The hot resistance is automatically temperature compensated for copper and aluminum
windings (using a s tandard or cus tomized reference temperature).
Resistance range from 1 μΩ t o 500 Ω. Ra tio from 1 t o10,000
4-Wire Measurement Technique allows the use of long measurement leads without sacrificing accuracy.
All the measur ements are made v ery accurately (See the S ystem Specifications at the end).
The system is computer controlled and fully automated for all the measurements. It requires no
manual intervention when operating in the Auto Mode.
The components used in the AWRMS™ 50 are of the highest quality, and designed and manufactured for a
The AWRMS™ 50 Software provided with the system is written in LabVIEW™. The test results are output in a
tabular format and an ASCII file for easy import to spreadsheets.
Addition to the innovative technology, the AWRMS™ 50’s speed and accuracy account for the increased
interest and preferred status among many well known transformer and reactor manufactures.
State of the art technology that will meet todays and future testing requirements.
Measurements on the primary and secondary of the three phase UUT are done simultaneously. Two power
supplies (max: 60 VDC & 50 A), handle even the largest PTs and saturates them within the shortest time. Auto
tap changer control signal is available for PTs with OLTC.
A wide range of features specifically tailored for the testing of large PTs are accomplished through a 20 Channel Scanner
Matrix (4-Wire). This ensures that all the temperature measurements are automated improving operator efficiency and
eliminating human errors.
An intrinsically safe and heavy duty discharge circuit rapidly dissipates the stored magnetic energy in the UUT after each
test. At that time, red warning indications come on the monitor. Over voltage protection is provided on all lines between
the system and the UUT.
The AWRMS™ 50 is a multi-parameter rack system and costs lesser than other similar systems. Its automated operation
improves measurement efficiency and reduces testing cost. The system, very much reduces the maintenance and
unexpected shutdown costs.
System control and data acquisition and measurement hardware as well as charging and discharging circuits.
• Two powerful supplies (3 kW) enable quick (≤ 40 Sec.) measurements at various test configurations on the UUTs with
up to 3 windings with 3 phases.
• Standard test cable length for all measurements to 30m are available.
• Built in industrial grade PC with IEEE 488.2 Interface, LCD Monitor, Keyboard, Mouse, MS Windows, MS Office 2007,AWRMS™ 50 Software.
• Automated Temperature Measurements: Very accurate temperature measurements on 20 Channels are available
using 4 Wire RTDs.
• System has ability to accommodate both Thermocouples or Thermistors.
• The standard system is supplied with Six (6), PT100 Standard RTDs for liquid
insulates (oil) each with a cable length of 15 m.
• The system is also supplied with six (6) PT100 Standard RTDs for metallic surfaces
(magnetic holder type), each with a cable length of 15 m. Longer lengths are
available at the time of order. A total of 20 Channels are provided the system
can be further expanded up to 40 channels.
• All connections for high current measurements are made at the rear of the
AWRMS for both high and low sides of the transformer. Each conductor is color
coded. All connections are of the screw on, locking type are used for both
resistance and ratio measurements. Standard cables are 10m in length; longer cables are available at time of order.
AWRMS™ 50 Software Features:
• User friendly program for hot and cold Resistance measurements.
• The program offers Auto and Manual Modes and flexibility for customization.
• Heat Run Test Software outputs temperature rise or cooling curve results in either graphical or tabular form.
• All results in ASCII file can easily be converted to Word, PDF, HTML, XML, CSV, etc.
CALIBRATION & VERIFICATION
Items required for calibration are Standard Resistor models 9332 /0.0001, 0.001, 0.01, and 0.1Ω and Model 9331 /10Ω.
Please see data sheet