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Revision #2
Instructions for the installation and
Section 5: Commissioning
•
CAUTION
BEFORE ENERGIZING THE SWITCHGEAR ASSEMBLY, ENSURE THAT THE
FOLLOWING ITEMS ARE TRUE.
•
The switchgear assembly is secured on a flat and level surface
according to the floor plan of the customer drawings.
•
Confirm all hardware is in place and tightened per section 4.10.2.
Attachment hardware bolt tightening torque.
•
Confirm no tools or objects are left inside the enclosure.
•
Confirm all devices, covers, doors, panels, etc., are secured.
•
Confirm that all gas pressure gauge readings are within the green
zone on the pressure gauge
•
Before start up, perform a field power frequency withstand (Hi-Pot)
test, using test voltages given in Table 5.
5.1. Final installation verification
Before attempting to put an Power Xpert IGX switchgear into
service, carefully examine the equipment for loose or obviously
damaged parts. Check the pressure gauges to ensure no loss of gas
pressure occurred during installation. Examine all wiring circuits have
not been damaged or loosened during shipment or installation. The
following information is a guide for performing recommended checks
and tests.
The vertical section circuit breaker is shipped with its contacts open
and closing springs in discharged state. The mechanical indicators on
the front panel will indicate this.
Charge the closing springs with about 16 rotations of the manual
charging crank. When charging is complete there will be an audible
CLICK and the spring charge status flag shows that it is charged
(yellow). Operate the push-to-close button.
The breaker will close as shown by the breaker contacts “closed”
(red) indicator. Operate the push-to-open button. The breaker will
open as shown by the breaker contacts “open” (green) indicator.
After completing this initial check, leave the closing springs
“discharged” and breaker contacts “open”.
5.2. Commissioning tests
5.2.1. Typical tests
Prior to beginning any testing, confirm that the equipment is
de-energized.
Below is a list of common tests that may be performed on the
Power Xpert IGX switchgear. Consult Eaton engineering services for
more information.
Power Xpert IGX test list:
•
Voltage withstand test
•
CTs ratio and polarity
•
VTs ratio and polarity
•
VDS functionality
•
Relay functionality
•
Ground bus continuity check
•
Camera operation
5.2.2. Power frequency voltage withstand test (PFWV)
ote:
N
The following table lists field Power Frequency Withstand Voltage
values for field testing, not the Power Xpert IGX medium voltage
switchgear PFWV ratings.
Table 5. Field Power Frequency Withstand Test Voltages
Rated Maximum Voltage (kV)
Power Frequency Withstand (rms) (kV)
4.76
14.25
8.25
27
15.0
27
27.0
45
38.0
60
In addition to a standard AC power frequency withstand voltage test
that can be performed on the Power Xpert IGX switchgear, several
different voltage withstand tests can be performed on Power Xpert
IGX switchgear cables. These include but are not limited to the
following tests.
•
DC voltage withstand test
•
Very Low Frequency (VLF) withstand test
Prior to performing any voltage withstand tests the switchgear must
be prepared.
5.2.2.1. Preparation for PFWV test
Prior to beginning preparing the switchgear for voltage
withstand testing, confirm that the equipment is de-energized.
•
CAUTION
FAILURE TO EFFECTIVELY GROUND VOLTAGE DETECTING CABLES L1, L2,
L3 PRIOR TO POWER FREQUENCY WITHSTAND VOLTAGE TESTING OR VLF
VOLTAGE TESTING COULD RESULT IN PERSONAL INJURY OR EQUIPMENT
DAMAGE.
The Voltage Detection System is equipped with four ports at the
front of the device to measure the detected voltage from the
bushings. Three ports are for L1, L2, and L3 voltages, and the fourth
port is a ground connection.
The following procedure must be followed before performing any
voltage withstand testing:
1. Ensure that the voltage detection system cables and the ground
wire are securely connected behind the VDS device.
2. Using three wires that are terminated with banana jack at each
end, connect the first wire between L1 port and the ground
port, connect the second wire between L2 and the ground port
and connect the third wire between L3 and the ground port as
shown in
ote:
N
After performing the voltage withstand test and before energizing the
switchgear for normal service, remove the three wires from the front
of the voltage detection system device.
