What does dU/dt mean?
This technology enables the rapid detection of very small discharge currents—even if a full breakdown has not yet occurred.
This technique is ideal for laboratory testing of wound products such as hairpins. The winding wires are often subjected to extreme mechanical stress during shaping. This can cause cracks in the insulating varnish. To test the quality, we supply high-voltage testing systems with the option of Test in a ball or water bath. The high voltage test usually high voltage test with TEST VOLTAGE continuously increasing TEST VOLTAGE the desired maximum TEST VOLTAGE is reached. As soon as the first signs of insulation weakness appear, this is detected by the testing device and the high voltage is switched off. The dU/dt evaluation is ideally suited for this purpose.
The oscillogram shows the moment when the voltage curve is no longer sinusoidal. This is device under test by weak insulation in device under test . The dU/dt evaluation detects this and switches off the high voltage.
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Incidentally, this type of testing in a ball bath with very small metal balls, or even better in a water bath, is also used on insulated gloves or plastic-insulated power tools such as VDE screwdrivers. We not only supply the high voltage test device for this purpose, but also the entire test equipment, including a water or ball bath and the necessary test cover mandatory contact protection.
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