How does hipot test work?
Hipot testing uses a high voltage source to make sure insulation is doing its job. An AC hipot test uses a voltage source that continually changes its voltage. The voltage alternates from positive to negative and back again. Generally there are 50 or 60 complete cycles of the alternating voltage each second.
What is DUT in hipot testing?
A dielectric strength test, commonly called a hipot test, dielectric withstand, or high potential, is a stress test of the insulation of a device under test (DUT). Such a test applies a voltage to the DUT that is much higher than normal operating voltage; typically 1000V AC plus twice the normal operating voltage.
How do I verify a hipot tester?
Attach the high voltage lead to one of the isolated circuit phase conductors. Switch on the HIPOT Tester. Set the meter to 1000 Volts or pre decide DC Voltage. Push the “Test” button on the meter and after one minute observe the resistance reading.
Can you hipot a transformer?
Hipot testing is performed by applying a voltage between any two points intended to be electrically isolated, and measuring the resulting leakage current. The hipot voltage may be applied between electrical circuits and chassis ground, for example, or between primary and second- ary circuits isolated by a transformer.
How do you test for current leakage?
Measurement of leakage current to ground Test single-phase circuits by clamping the phase and neutral conductor. The measured value will be any current flowing to ground. Test three-phase circuits by clamping around all three-phase conductors.
How high can the voltage of a hipot test be?
Experiments and research have shown that these over voltages can be as high as 1000 V. Hipot testers usually connect one side of the supply to safety ground (Earth ground). The other side of the supply is connected to the conductor being tested.
What is a hipot tester?
Early commercial hipot testers were actually not much more than a variac-driven step-up transformer used to ramp up the test voltage and then dwell at the specified voltage for the prescribed time period – all the while monitoring The Vitrek V7X Hipot Tester is well-suited to the requirements of electrical safety production testing.
Do you hipot Transformers in the field?
It is certainly plausible that the reason we don’t hipot transformers in the field is out of concern for insulation degradation. On the other hand, if you have been repeating it in the factory and haven’t seen failures during your final testing, that would seem to be a pretty good argument that the hi-pot isn’t hurting.
What is the difference between AC hipot and DC hipot testing?
One of the advantages of an ac hipot test is that it can check both voltage polarities, whereas a dc test charges the insulation in only one polarity. This may become a concern for products that actually use ac voltage for their normal operation.