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Operation
3) Manual Operation
Operate each device by hand to confirm
that the moving parts operate freely
without binding. Ensure electrical
contact tips are clean, free of grease and
contamination, and have a good surface
contact.
4) Adjustments
The contactors are carefully adjusted
at the factory. However, if adjustments
are needed, refer to the instruction
documents for information on individual
devices. FlexTrol
™
can be operated after all
connections are made, parts are assembled,
and equipment and components are
thoroughly adjusted and inspected.
5) Pre-Startup Checks
The dielectric strength of the vacuum
interrupters should be checked before the
contactor is energized for the first time
and regularly thereafter to detect at the
earliest possible date any deterioration in
the dielectric strength of the interrupter,
because this may result in an interruption
failure. The test is best performed with
the contactor removed from the controller
cubicle. Refer to
F. Removing the Medium Voltage Vacuum
, for removal instructions. If
testing is performed with the contactor
installed, care must be taken to ensure
no damage is inflicted on the controller
control power transformer (CPT), potential
transformers (PT), or to the controller load.
Removal of the primary fuses is sufficient
to protect the CPT or PT’s. Cables to the
load should be disconnected. Although an
AC test is recommended, a DC test may be
performed if only a DC test unit is available.
A good vacuum interrupter will withstand
a 16kV - 60Hz test or a 23kV -DC test across
the normally open contact gap. When
performing DC tests, the voltage should be
raised in discrete steps until the final test
voltage is reached. When tested with an AC
high-potential tester, expect a capacitance
leakage current of approximately 1
milliampere per interrupter. Refer to the
most current version of Eaton IB-48018N for
more information on dielectric testing of
the vacuum interrupters.
The insulation level of the starter should
be checked and recorded before the unit is
energized.
Enclosure doors should close easily. Do
not force doors closed, but rather look for
improperly positioned contactors, isolating
switches, or other devices.
Ensure that all phase barriers are in good
condition and are properly installed. Note
that larger and/or additional barriers are
used when double-barrel fuses are in use.
6) Contactor Interlock Pre-Start Up Check
Do NOT work on a FlexTrol
™
vacuum
contactor with the control circuit energized.
Verify with a hotstick or appropriate
measuring device that all circuits are free of
voltage. Failure to do so my result in personal
injury or death.
!
WARNING
a. Ensure that all power to the equipment
is removed.
b. Open the isolation switch.
c. Open the medium voltage door.
