MWA300 and MWA330A three-phase ratio and winding resistance analysers

The Megger MWA300 and MWA330A three-phase ratio and winding resistance analysers are advanced transformer test systems that provide complete ratio, phase, and winding resistance measurements with only one three-phase lead set connection. What’s more, they offer portability, a reduced set-up time, and increased job safety.

Once connected, the MWA300 and MWA330A perform DC resistance measurements on all high- and low-side windings without reconnection. It has an eight-terminal/six-winding resistance measurement capability and doesn’t need any interconnected boxes, allowing you to test all phase windings without having to disconnect and reconnect leads.

The MWA300 and MWA330A save you even more time by using a single software platform: PowerDB. This means you only need one setup and one easy-to-use test form.

The MWA300 and MWA330A can be used to effectively test power transformers, distribution transformers, CTs and VTs, and motors and generators. The following tests/functions are easily performed with a single instrument and one three-phase lead set connection:

Three-phase turns ratio

Three-phase winding resistance

OLTC continuity (make-before-break)

Three-phase core demagnetisation

Magnetic balance/flux distribution

Excitation current

Polarity and phase angle deviation

Auto vector detection

Heat-run test

The MWA300 is externally controlled by PowerDB software running on an external PC. The MWA330A, on the other hand, comes equipped with its own built-in computer that can be operated via a 305 mm (12 in) colour touch screen display and can store up to 100 000 data sets.