The Megger MWA3 Series Transformer Winding Analyzer is designed to perform transformer
ratio and winding resistance testing in one box quickly and efficiently. It is an advanced three-
phase portable transformer test system that reduces set-up time, increases job-site safety and
delivers improved productivity versus individual instrument testing.
The unit’s light weight (15kg/32 lbs.) and small size (280 x 280 x 460 mm/11 x 11 x 18 in.)
makes it 40% lighter to carry and offers 55% more space in vehicles than other equipment on
the market today. The ease and convenience of using the same set of test leads eliminates the
need for frequent ladder trips and mistakes with lead connections from one lead set to another;
one set of leads equals one ladder climb.
The MWA3 Series provides complete ratio, phase and winding resistance measurements for a
three-phase transformer. All ratio and winding resistance tests are performed in one instrument
with one three-phase lead-set connection. Testing complex three-phase transformers becomes
easier with the MWA3 Series, as operator uses one setup, one connection and one common
test form for a consistent, easy-to- learn test method. The following tests are easily performed
with the MWA3 Series, all with one instrument and one three-phase lead-set connection: 3-
phase turns ratio, 3-phase winding resistance, auto vector detection, heat-run test,
OLTC/continuity (make-before- break), core demagnetization, magnetic balance/flux distribution,
excitation current, polarity, and phase angle deviation.
There are two interface options available. The externally-controlled model MWA300 is a “black
box” style package that is remotely controlled by PowerDB software running on an external PC
(not provided). The MWA330A model (available August 2017) features a built-in 12-in./300- mm
industrial touch-screen computer.
PowerDB software provides the unit with a common user interface to minimize operator training
and delivers a seamless interface to the computer application. PowerDB Lite software is
included with the MWA3 Series.
Typical end users of the MWA3 Series include power utilities, electrical testing companies and
field commissioning, service and maintenance personnel.
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