Dielectric Voltage Withstand Check Of Electrical Goods
Dielectric voltage stand up to test is demanded in almost every safety standard of
electrical safety tester items, for dielectric voltage stand up to test is a fundamental part of security standard of electrical items. Dielectric voltage withstand test is the so-called high voltage check which happens to be a test to identify whether the insulating materials and spatial distances conform to the regular by giving a voltage which can be higher than the rated voltage towards the equipments for particular time.
Test Method
1. Verify if the primary energy switch of the hipot tester is OFF.
2. With the exception of the special design in the equipment, all the other conductive metal parts should really be well grounded.
3. Connect all the wires or terminals at the power input end of the measured equipment.
4. Close all the power switches and relays, etc.
5. Set the tested voltage of the hipot tester to zero.
6. Connect the higher voltage transmission line (more often than not red) towards the power input end in the measured equipment.
7. Connect the loop grounding line (typically black) to the accessible conductive metal component in the measured equipment.
8. Close the leading energy switch of the hipot tester and raise the secondary voltage of the hipot tester towards the desired value slowly. Commonly, the raise speed of voltage will need to be kept below 500V/sec.
9. Maintain this testing voltage within the time specified.
10. Lower the testing voltage slowly.
11. Disconnect the main energy switch of the hipot tester. First disconnect the higher voltage transmission line and then the loop grounding line.
The following cases show that the measured equipment fails the test:
The testing voltage cannot be raised to the desired voltage value or it lowers instead.
There may be warning signal on the hipot tester.
It needs to become noticed that we might be fairly careful because there is high voltage which is danger for human body existing in the dielectric voltage withstand check.
Cases that can make the equipment free from factory dielectric voltage withstand check.
The power input in the products is the ELV or SELV in the secondary output of other items, such as power supply and transformer.
The product will use alternative energy supply as component, and this energy supply is identified by CSA, of complete case and input and output connector. For it truly is identified by CSA, this power supply has passed the dielectric voltage stand up to test. Therefore, we can consider relieving it from dielectric voltage withstand test. Nevertheless, we have to verify whether the power supply is damaged before it's installed.
When the signal transformer is applied in the circuit of same voltage, and it can be not the safety device, we can consider relieving the part from the start to the iron core from dielectric voltage stand up to check.
Matters that ought to be paid specially attention to:
It ought to be specified that only trained and authorized personnel can come into the check zone and operate the equipment.
Fixed eye-catching warning signals ought to be set around the check zone to keep other people away from the danger area.
During the test, all the personnel, including the operators, must keep distance with the
hipot tester and measured equipment.
When the tester is started, the output line should never be touched by anyone.
by: sdaxc
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