66
Instruction Booklet
IB022018EN
Effective July 2020
Instructions for the installation and
EATON
www.eaton.com
Figure 119. Lower VT connection cone into its port.
Using the VT installation tool, bolt the VT into place (see
Figure 120. Tighten VT bracket with installation tool.
•
Replace the VT install access bracket.
•
Bolt the VT lifting bracket to the VT bracket brace on the back side
of the VT compartment.
•
Tighten the VT bracket brace to the XGIS section back wall.
•
Connect the VT secondary wiring cable plug to the VT surface-
mounted connector.
Cable compartment cable connected unfused VTs
•
If installing from the front of the vertical section, remove the
front cable compartment cover and slide the VT into the cable
compartment, using guide rails to slide the VT to the rear VT
mounting base.
•
If installing from the rear of the vertical section, remove the rear
cover and slide the VT into the cable compartment.
•
Bolt the VT to the mounting brackets.
•
Apply silicone to the VT inner cone cable assembly.
•
Bolt the VT inner cone cable assembly to the VT.
Remote cable connected fused VTs
•
Installation methods to be determined by licensed installation
contractor.
•
Apply silicone to the VT inner cone cable assembly.
•
Bolt the VT inner cone cable assembly to the VT.
•
VT inner cone cables should be routed through a IP4X rated
bushing into the cable vault.
•
Fill each bushing with caulk to meet IP4X requirements, with no
gaps over 1mm in diameter.
5.14.3 Voltage transformer removal
•
Ensure the XGIS is de-energized and properly locked out.
•
Ground the voltage transformer:
ote:
N
When isolating VTs from an energized primary bus, it is recommended
that the VT secondary (low voltage) circuit breaker be opened to interrupt
current flow through the switch contacts prior to operating the VT disconnect
to or from the connected position.
•
for main bus fused VTs, use the VT earthing switch to
disconnect and ground the VT primary winding
•
for bottom and remote mount cable connected VTs, move the
three-position switch to the Ground position and close the
circuit breaker.
•
Verify the XGIS is in a zero-energy state.
•
Perform the installation steps in reverse order.
5.14.4 Fused voltage transformer fuse replacement
ote:
N
Fuse removal instructions do not apply to applications where the
authority having jurisdiction requires non-removable VT fuses.
Main bus fused VTs and external fused VTs use the same model
2A primary fuse. The fuses are mounted in both VTs in the same
way and are replaced in the same way.
m
DANGER
ENERGIZED PARTS WILL CAUSE SERIOUS INJURY OR DEATH. DO NOT
ATTEMPT TO REPLACE A VOLTAGE TRANSFORMER FUSE WHILE THE XGIS
SWITCHGEAR IS ENERGIZED.
BEFORE INSTALLING OR REMOVING THE VOLTAGE TRANSFORMER FUSE,
CUT POWER TO THE RELEVANT BUSES OR CABLES AND GROUND THEM
ACCORDING TO REGULATIONS.
In both the fused main bus VT and the fused external VT, the fuse
is mounted in an insulating cylinder inside the VT body. The cylinder
has conductive collars at each end. A spring, attached at the inner
end of the cylinder, provides positive electrical contact with the rear
fuse pole. A threaded conductive cap, screwed into the conductive
threaded collar at the entry end of the cylinder, provides positive
electrical contact with the front fuse pole.
Access to the fuse is provided by a Dummy Cable Plug, located in
the VT body opposite its high voltage connection cone. This plug
consists of an insulating insert attached to a round cover. The round
cover is held in place by three hex head screws.
Remove the cover and the attached insulating plug to expose the
threaded conductive cap. Unscrew the threaded conductive cap
to reveal the fuse, which can then be extracted from its insulating
cylinder and replaced.
Fuse replacement is the same for both main bus and external
fused VTs. The main bus VT will be installed in its mounting bracket
with the VT body vertical (see
Figure 112
). The external VT will be
mounted horizontally.
