VOLTECH AT3600 USER MANUAL PROGRAMMING TESTS
TEST PROGRAM EDITOR VPN 98 - 024 PAGE 3.4.43.
4.25. HPDC - DC HI-POT (EHT)
The dc high-pot (or EHT) test is used to check for safety isolation between windings,
or between windings and the core or screens.
During the test, a dc voltage is applied across two groups of windings with the
windings in each group being shorted together. The voltage and current are
monitored throughout the dwell time; if either the test voltage cannot be maintained,
or the current is too large, then a failure will be recorded.
On selecting ‘HPDC High-Pot dc’ from the Available Tests window, a dialogue box
will be displayed:
To program the test :
1. Enter the test voltage, and the ramp-up and dwell times.
2. Enter the terminal names for the High and Low Terminals.
Click with the mouse to select a terminal from the Available list; then click the
‘Add >‘ button to transfer it to the Used list.
(To correct a mistake, click with the mouse to select a terminal from the Used
list; then click the ‘< Remove’ button to transfer it back to the Available list.)
3. Enter the maximum current value in the bottom section.
4. Select OK. The test specification will then be displayed in the program window.
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