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AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 7. Testing and Inspecting
is automatically connected to the trip unit in the breaker via a
draw-out secondary disconnect block.
Complete Instructions for testing the trip units are included
with the test set. The trip unit user manuals are DEH-4567
(EntelliGuard trip unit) and DEH-4568 (GTUTK20).
CAUTION: Never disengage the trip unit on a circuit
breaker that is energized and carrying load current. This will
open circuit the current sensors, allowing dangerous and
damaging voltages to develop.
Entellisys System Test Kit (Entellisys AR Only)
The Entellisys system can be tested with the Type
ETSTESTKIT03 test kit, a portable instrument designed for
field-testing of the Entellisys system functionality. The test kit
user manual is DEH-503.
Final Steps to be taken Before
Energizing Equipment
The following steps should be taken before energizing the
equipment:
1.
Manually exercise all switches, circuit breakers, and
other operating mechanisms to make certain they
are properly aligned and operate freely.
2.
Conduct an electrical insulation resistance test to
make sure the switchgear is free from short circuits
and grounds. This should be done both phase-to-
ground and phase-to-phase with the switches or
circuit breakers both opened and closed. This test
should be performed with a 1000 volt meggar.
Disconnect all control circuits before checking
resistance.
3.
Check any electrical relays, meters, or
instrumentation to determine that connections are
made properly and the devices function properly.
4.
Electrically exercise all electrically operated circuit
breakers, and other mechanisms (but not under
load), to determine that the devices operate properly.
An auxiliary source of control power may be
necessary to provide power to the electrical
operators.
a.
(Entellisys AR Only): Using the Entellisys HMI,
exercise all EntelliGuard circuit breakers to
determine all devices are functioning
correctly. For Entellisys HMI instructions,
reference DEH-501.
5.
Test the ground fault protection system (if furnished)
in accordance with the manufacturer's instructions.
a.
(Entellisys AR Only): Test all protective
functions using the Entellisys Test Kit
47
Courtesy of NationalSwitchgear.com
(ETSTESTKIT03). Reference DEH-503 for
instructions.
6.
Set the adjustable current and voltage trip
mechanisms to the proper values. Experience has
indicated that damage from faults can be reduced if
the devices used for overload and short circuit
protection are set to operate instantaneously (that is,
without intentional time delay) at 115 percent of the
highest value of phase current which is likely to occur
as the result of any anticipated motor starting or
welding currents.
7.
Make certain that field wiring is clear of live bus and,
where necessary, physically secured to withstand the
effects of fault currents.
8.
Check to determine that all grounding connections
are made properly.
9.
Remove all debris, scrap wire, etc., from the
switchgear interior before closing the enclosure.
10. Install covers, close doors, and make certain that no
wires are pinched and that all enclosure parts are
properly aligned and tightened.
WARNING: The following must be adhered to ensure
the integrity of the arc resistant enclosure:
• EntelliGuard racking handle(s) must be returned to all
breaker compartment(s).
• Key interlock(s) or the metallic key interlock plug(s) must
be installed to all breaker compartments
• Position switch(es) or the metallic position switch
covers(s) mustbe installed to all breaker compartments.
• Breaker compartment door(s) must be closed and
latched.
• Breaker compartment(s) without a circuit breaker(s)
must have a future door cover(s) and future cassette
barrier(s) installed.
• Exhaust plenum system must be properly installed.
• Rear compartment door(s) must be closed and bolted.
• IR window cover(s) must be closed and secured.
©2016 General Electric. All rights reserved.
DEH-41473
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