Combined instrument for measuring winding resistance and transformer ratio MWA300

MEGGER's MWA3xx Transformer Analyzer is an advanced 3-phase portable power transformer testing system that provides: reduced setup time, increased safety and productivity. The MWA3xx allows you to measure the turn ratio and DC winding resistance of a three-phase transformer in one connection. All tests and winding resistance ratios are performed in one instrument, with only one outlet of the 3-phase connection installed. The MWA3xx uses PowerDB as a single software platform, saving the user time when filling out a plate for two test reports. The MWA3xx is intended for testing power and distribution transformers in substations with high noise levels, harsh outdoor conditions or in industrial process rooms. It is ideal for testing complex 3-phase transformers (on-load tap-changer, loop-through current transformers and tertiary ones) in 10% of the time required by conventional instruments for the same measurements.

The following tests are easily performed with a single MWA3xx with a 3-phase connection • 3-phase transformation ratio • 3-phase winding resistance • OLTC / continuity (in the process of switching) • 3-phase demagnetization • Magnetic balance / flow distribution • Excitation current • Polarity and phase angle deviation • Defining a connection group • 3-phase connection test (without box interconnections)

Typical problems identified by MWA: • Loose contact connections • Short-circuited coils • Branch break • Winding deformation • Problems with tap changers • Connection synchronization issues • On-load tap contact problems