34 S&C Instruction Sheet 682-510
Dielectric Testing
Fault-Interrupter Testing
When performing dielectrical tests on Vista switch-
gear, the vacuum fault interrupters will not be subject
to voltage across the open gap because the disconnect
switch will isolate the vacuum interrupter from the test
voltage. Because the vacuum interrupter will not be ener-
gized across the open gap, there is no expo sure to X-rays
normally associated with high-voltage testing of vacuum
devices. Routine testing of the vacuum fault interrupt ers
is not recommended. For those users who desire to test
the vacuum interrupters, contact the nearest S&C Sales
Ofce for specic instructions.
WARNING
When it is necessary to test the cables connected
to a unit of energized switchgear, proper isolation
of the power-frequency source from dc test source
must be maintained� Follow the recommendations by
the manufacturer of the dc test equipment or
fault-location equipment� The user’s operating and
safety procedures should be followed for grounding
the cable, connecting the dc test source, isolating the
dc test source (in case of flashover), ungrounding the
cable, applying the dc test source, discharging the
cable, and ungrounding the cable� Failure to follow
these operating and safety procedures may result
in injury or equipment damage�
To Next Page
Loading...
