Breakdown voltage testing procedure.
High voltage breakdown testing procedure.
To assess the insulating property of dielectric transformer oil a sample of the transformer oil is taken and its breakdown voltage is measured.
A resistor is connected with series with the transformer to limit the short circuit current in the event of breakdown occurred in the device under test.
If the insulation holds the voltage the device is deemed to have passed the test.
The test involves placing an extra high voltage across the insulation barrier of the device for one minute.
A dielectric withstand test or pressure test high potential or hipot test is an electrical test performed on a component or product to determine the effectiveness of its insulation the test may be between mutually insulated sections of a part or energized parts and electrical ground.
Whereas most withstand voltage testing is carried out with an ac current insulation resistance testing which measures only the resistance component uses a dc current.
The test is usually performed at about 75 of the typical breakdown voltage and is done as a safety net.
Dielectric breakdown testing is used in product design and qualification stages.
The test is sensitive to arcs or corona so it often finds terminal spacing problems over mold problems tolerance errors in idc cables or any problem that might produce arcs.
The test is a means to qualify a device s ability to operate safely during rated electrical conditions.
The resistor is rated with as many.
Specifications and test procedures.
At the end of the one minute test switch the hipot tester from the high potential test mode to the voltage measuring mode to confirm that the circuit phase conductor and voltage of hipot tester are now reading zero volts.
The lower the resulting breakdown voltage the poorer the quality of the transformer oil.
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Dielectric breakdown testing may be required during the development of assemblies used in critical applications.
Repeat this test procedure for all circuit phase conductors testing each phase to ground and each phase to each phase.
High voltage is applied across a specimen of insulation or equipment under test by means of a high voltage transformer.
The transformer oil is filled in the vessel of the testing device.
However if the applied voltage leads to the sudden breakdown of the insulation material and allows current to flow the insulation is determined to be.
This test procedure covers the general high voltage tests required for the high voltage high power alternating current generator described as one of the selected power sources in u s.
It helps establish the maximum voltage of the design.
It can also be used on a random sample basis to verify that the maximum voltage is not changing.
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