How to Perform a Test
AVTMST16 Rev 1 May 2016
33
Step Description
3
Adjust the test voltage and select
to confirm the value.
4
Press the green illuminated “HV ON” button
.
5
Select
to start the test (only if
Measurement Start
option is set to
Manual
.
See
“System Settings
on page 17).
Result:
The selected voltage is applied to the cable shield.
During the rise of the voltage the maximum current of the HVPS will be displayed till
the cable has been fully charged, at which time the current will drop down to the actual
leakage current level. The insulation resistance is displayed. This scenario is
observed if the cable has no insulation breakdown, otherwise the high voltage will be
shut off when the flashover / breakdown occurs.
Depending on whether a breakdown takes place during the test, one of the following
results is presented in the display:
Breakdown
at … kV
A voltage breakdown took place at the indicted test voltage.
No Flash-
over
The cable jacket has successfully withstood the applied DC test voltage.
You can repeat the test using the
menu item.
Cable not
chargeable
The cable shield could not be charged with the test voltage. This may be
due to a short on the circuit (fault in the jacket).
Low
resistance
at … kV
The HV source failed to charge the cable shield beyond the indicated
voltage value due to the very high leakage current level.
6
Select
to proceed with sheath fault pinpointing or
to return to the main menu.
Summary of Contents for SMART THUMP ST16
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Page 3: ...Portable Fault Locating System SMART THUMP ST16 User Manual ...
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