Comparison Electrom iTIG II D12 vs AWA IV-12kV

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As I had mentioned in my last newsletter, I had a project that called for a field test suite that was performed by the AWA IV 12kV tester.  Unfortunately, the rental companies were unable to provide me with a functioning instrument, so I ended up purchasing, instead of leasing, a competing unit, the Electrom iTIG II D12 fully loaded.  The repair shop that I use for research and development had purchased an AWA a few years ago and the winding department was a little frustrated with it stating that it seemed to miss many faults.  By request, we performed testing on motors that had been ‘missed’ by the AWA to see if there was some other issue going on.  We found it interesting that the notes on the reports for in-process work reflected the frustration of the winding department at the repair shop (notes are in images below) and we had also run into the same issue while performing testing during a motor diagnostics class.

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Above: The AWA on the left and the Electrom on the right

There were two motors that had been tested the previous week where the repair shop had noted visible shorts and damage.  One was a machine tool motor and the other was a relatively common 1800 RPM, 100 hp rolled steel Lincoln motor.

Following are the tests performed by the two units:

Electrom AWA
Resistance X X
Insulation Resistance X X
DC High Pot X X
Surge Test X X
PD Surge X
Impedance X
Inductance X
Phase Angle X
Capacitance X
Rotor Test X

The Electrom unit being used is relatively new to the market and, with all of the features (less DC testing) was priced the same as the AWA.  The AWA had ‘prettier’ reports, both performed testing within the same amount of time and produced Red/Green findings.

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Above: Machine with shorted turns

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Above: Image of AWA  Report

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The second machine was the 100 hp Lincoln Electric motor.  The AWA provided the following:

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Above: Test result on visually failed stator winding.  Notes are from the winding technician.

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Finally, we also decided to test and evaluate the Electrom’s rotor influence test on a motor that had suspect rotor casting voids.  We are looking forward to additional testing on rotors.  However, the Electrom performed in 30 minutes what we were able to do with an ALL-TEST PRO 33 instrument in about 2 minutes.

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