Eaton Power Xpert XGIS, Instruction Booklet

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59
Instruction Booklet IB022018EN
Effective July 2020
Instructions for the installation and
commissioning of Power Xpert
TM
XGIS gas insulated switchgear
EATON
www.eaton.com
5.13.2.1 Cable connections
Since the cable CTs are fitted over the cable bushing, the mounting
process requires that the bracket be mounted over the cable bushing
and the CTs fitted on to the cable bushing.
The cable bushing can accommodate a variety of CT designs, and
multiple CTs per phase, space permitting.
Cable CT configuration will depend on the XGIS rating. 1250 A XGIS
switchgear will use one cable bushing and one or more CTs per
phase. 2000 A and 2500 A XGIS will use two cable bushings and
one or more CTs per phase.
Note : All bushings without main busbar or cables installed shall have
a grounded SSIS cap.
See
Figure 39
for an illustration of a cable CT fitted over the cable
bushing.
Figure 40 shows an example of a 1250 A cable side CT.
Figure 41 shows an example 2000 A / 2500 A cable side CT. One CT
wraps around two bushings per phase.
Figure 42 shows an example of how the 1250 A CT bracket mounts
over the cable connection bushings.
Figure 44 shows examples of 1250 A cable side CT brackets.
Note
that the CTs can be arranged in a variety of configurations,
with combinations of standard accuracy and high-accuracy models
if desired. Threaded standoffs are used to fix the CTs in position in
their brackets. In this example, the standoffs are emphasized in red.
Figure 43
and
Figure 45
show examples of 2000 A / 2500 A cable
side CTs and brackets.
5.13.2.3 Bus tie CTs
For XGIS switchgear designed for bus tie use, the tank design
employs vertical cone bushings on the tank bottom instead of
horizontal bushings for cable connections.
Where bus tie sections are connected together, SSIS bus will
connect their output bushings, using bus joints. Tank bottom
mounted CT brackets are used instead of cable connection bushings.
See
Figure 46 for the Bus Sectionalizer configuration with tank
bottom cones for bus joint connection.
See Figure 47 for an example of a bus tie tank with its connection
cones projecting down from the tank bottom.
Figure 102 shows a bus sectionalizer tank bottom CT in its bracket.
Figure 102. Bus sectionalizer CT in bracket.
Figure 103
shows a bus tie CT in its bracket with the SSIS busbar
passing through its aperture.
Figure 103. Illustration showing bus tie CT mounted in its
bracket below the tank.