Test Technology - Corona Testing
ATI’s corona test is conducted by detecting any very high frequency disturbance while conducting a surge test at a voltage equal to the desired corona inception voltage (CIV).
The detection circuitry is contained in the low impedance circuitry of the surge circuit. This enables the corona detection to be very immune to radiated noise often found
in motor manufacturing facilities. Competitive equipment utilizes antennas to pick up the partial discharge that results when corona becomes excessive. Unfortunately,
this method also picks up radiation from other sources such as variable speed conveyors, welders, etc.
Other methods look for voltage variations in the high voltage surge pulse. This technique again, only picks up corona when it becomes excessive. Corona testing is not only
necessary to qualify motors intended for inverter applications but is also a useful tool in determining the quality of the varnish process and materials used in the varnish process.
Click on the links below to learn more about the test technologies we provide.
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