Eaton Power Xpert XGIS, Instruction Booklet

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73
Instruction Booklet IB022018EN
Effective July 2020
Instructions for the installation and
commissioning of Power Xpert
TM
XGIS gas insulated switchgear
EATON
www.eaton.com
Removing a fused VT and installing an insulating plug
In order to satisfy the conditions of item 2. above, it will be
necessary to remove a fused VT from its VT port on top of the tank,
then plug the port with an insulating dummy plug. To do this,
1. Confirm that the equipment is de-energized
2. Loosen the four bolts holding the fused VT assembly to the
tank VT port.
3. Disconnect the fused VT signal cable plug from its VT
receptacle.
4. Remove the VT from the VT port area (see Figure 116) .
5. Install an insulating dummy plug, Eaton Catalog Number
87A1025H01.
6. Secure the dummy plug to the VT port by tightening the bolts
to 13 Nm (115 in.-lb.) See Figure 133 , below.
Figure 133. VT port with insulating plug installed.
ote: N Any empty VT port or exposed cable terminations must be insulated by
installing an insulated plug or insulating cap respectively.
7.2.2 Performing switchgear voltage test
Power frequency withstand voltage tests should be performed at an
AC voltage not to exceed the field PFWV level. PFWV tests should
be performed with adequately rated AC hipot equipment.
Power frequency withstand voltage tests can be performed directly
on the XGIS switchgear by installing a voltage test cable (see
Figure 134
onto an empty cable bushing or by installed a power test
cable into the termination left for the lightning arrester (if applicable).
Any power cables connected to a load must be disconnected from
the load prior to voltage withstand testing. Empty (unapplied)
terminations of any power cables that are connected to the XGIS
switchgear must insulated and/or isolated.
Figure 134. Voltage test cable.
Power Frequency withstand voltage testing of the XGIS switchgear
can also be performed using customer power cables. This test
should be performed using AC Hi-Pot testing equipment only. The
voltage test should not exceed 60 kV or 75% of the cable’s rated
voltage, whichever is less.
7.2.3 Performing cable voltage test
XGIS switchgear is designed to allow the dielectric testing of power
cables while the power cables are connected to the switchgear. Any
cables under test should be isolated from the main bus using the
3PDS. Once isolated, cable testing can be conducted with the main
bus energized up to the rated nameplate value.
The power cables must be disconnected from any load prior to
testing. After disconnecting the cable from the load, hi-pot test
equipment can be used to perform the applicable voltage withstand
test on the entire cable run.
Typical voltage tests that can be performed on the power cables are:
•
Direct Current withstand voltage tests
•
Very Low Frequency withstand voltage test
To avoid damage to the XGIS switchgear and PFWV test equipment,
cable test voltages should not exceed the following values:
•
DC PFWV Test - 80 kV
•
VLF (very low frequency) PFWV Test - 56 kV
7.3 Current test
Contact Eaton engineering services for more information.