Dielectric Voltage Stand Up To Test Of Electrical
Goods Dielectric voltage stand up to check is demanded in almost each and every security
regular of electrical safety tester products, for dielectric voltage stand up to check is a critical part of safety regular of electrical products. Dielectric voltage withstand check is the so-called high voltage test which happens to be a test to determine whether the insulating materials and spatial distances comply with the standard by providing a voltage which is greater than the rated voltage towards the equipments for certain time.
Check Method
1. Verify if the primary power switch of the hipot tester is OFF.
2. With the exception of the special design in the equipment, all the other conductive metal parts really should be well grounded.
3. Connect all the wires or terminals at the energy input end of the measured equipment.
4. Close all the power switches and relays, etc.
5. Set the tested voltage in the hipot tester to zero.
6. Connect the higher voltage transmission line (in most cases red) to the power input end of the measured equipment.
7. Connect the loop grounding line (quite often black) to the accessible conductive metal part of the measured equipment.
8. Close the leading energy switch in the hipot tester and raise the secondary voltage of the hipot tester to the desired value slowly. In general, the raise speed of voltage ought to be kept below 500V/sec.
9. Maintain this testing voltage within the time specified.
10. Lower the testing voltage slowly.
11. Disconnect the leading power change in the hipot tester. First disconnect the high 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 towards the desired voltage value or it lowers instead.
There is warning signal on the hipot tester.
It needs to be noticed that we should really be fairly careful because there may be high voltage which happens to be danger for body existing in the dielectric voltage withstand test.
Cases that can make the equipment free from factory dielectric voltage withstand check.
The energy input in the goods is the ELV or SELV in the secondary output of other products, such as energy supply and transformer.
The item will use alternative energy supply as component, and this power supply is identified by CSA, of complete case and input and output connector. For it's identified by CSA, this power supply has passed the dielectric voltage withstand check. Therefore, we can consider relieving it from dielectric voltage stand up to test. Nevertheless, we have to check whether or not the power supply is damaged before it really is installed.
When the signal transformer is applied within the circuit of same voltage, and it truly is not the safety device, we can consider relieving the component from the start to the iron core from dielectric voltage stand up to check.
Matters that will need to be paid specially attention to:
It will have to be specified that only trained and authorized personnel can come into the test zone and operate the equipment.
Fixed eye-catching warning signals ought to be set around the check zone to keep other people far 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 not be touched by anyone.
by: sdaxc
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