Eaton Power Xpert XGIS, Instruction Booklet

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Instruction Booklet IB022018EN
Effective July 2020
Instructions for the installation and
commissioning of Power Xpert
TM
XGIS gas insulated switchgear
EATON
www.eaton.com
1.6 SSIS conductor system
Solid Shielded Insulation System components provide modular
shielded busbar conductors protected by solid insulation. The system
includes shielded bus sections and coupling bus joints that provide
mechanically robust installation that is impervious to environmental
conditions, and free from local electric field around the conductors.
The SSIS conductors and connecting bus joints consist of three
concentric layers:
•
The live conductor
•
The insulating layer over the conductor, and
•
The conductive shield outer layer
Figure 59 shows some example SSIS components and their
arrangement as bus sections and terminations. Bus sections start
at bus connection bushings (fitted in the tank) coupled to end or
cross bus joints, extend using SSIS busbar, and terminate at bus
connection bushings connected to end or cross type bus joints.
Figure 59.
End
Bus Joint
Cross
Bus Joint
Example SSIS components and assemblies.
1.6.1 SSIS bus in XGIS gas insulated switchgear
SSIS type busbars are installed as main bus conductors in XGIS
switchgear.
Main busbars are installed and coupled to the bus connection
bushings fitted on top of the sealed tank. Main horizontal busbars
are enclosed in a separate compartment above the sealed tank.
Figure 60. Top view of XGIS tank showing tank bushings for
busbar connections.
The bushings are mounted on top of the gas tank and are connected
to the switching components in the tank via busbar inside the tank.
See Figure 2.
SSIS cross bus joints are used to extend the bus between the adja-
cent vertical sections. See Figure 34 .
The SSIS busbar end bus joints, cross bus joints, caps, and busbar
include a shield layer that is used to ground the exterior of the
busbar system. The ground wires must be fastened to the ground
studs on the tank. This will ensure the outer surface of the entire
busbar system is at ground potential.
Figure 61. SSIS bus conductor shield grounds.
The bus joints used to connect bus sections differ with the bus
rating. There are two bus joint types and two connection types.
The Type C bus joint serves 1250 A bus, and provides connections
in either cross or end configurations. The Type F bus joint serves
2500 A bus, and also provides connections in either cross or end
configurations.