60
Instruction Booklet
IB022018EN
Effective July 2020
Instructions for the installation and
EATON
www.eaton.com
5.13.3 Installing CTs on main bus or cable side applications
m
DANGER
ALL ASSOCIATED APPARATUS MUST BE DE-ENERGIZED DURING ANY
HANDS-ON INSTALLATION OR MAINTENANCE. FAILURE TO COMPLY WILL
RESULT IN DEATH, SEVERE PERSONAL INJURY AND EQUIPMENT DAMAGE.
The process for installing CTs will depend upon where they are to go.
5.13.3.1 Installing main bus or bus tie CTs
This procedure applies to each phase bus connection.
CTs installed in the main bus compartment or in the lower
sectionalizing compartment for bus tie connections must first be
threaded over their SSIS busbar as part of the SSIS bus system
installation process. This is achieved by fitting the CT over the SSIS
busbar prior to building the individual SSIS bus phase assemblies
(typically on first XGIS section install), and attaching the CTs to CT
mounting brackets already fastened to the tanks as detailed below.
1. Confirm that all power to the lineup is de-energized and locked
out per the plant lockout/tagout procedures.
2. Mount the CT bracket to its attachment points on the tank.
3. Thread the SSIS busbar section through its CT(s).
4. Insert the SSIS busbar exposed bus into its bus joints (see
section
5. Place the combined SSIS busbar, CT(s) and bus joints on to the
destination tank cones, and secure them.
6. Slide the busbar CT(s) into its (their) tank-mounted CT bracket.
7. Secure the CT(s) to its (their) bracket.
8. Connect the CT signal cable(s) to the CT secondary signal
connectors.
As an alternative, the CTs and associated mounting brackets can
be sub-assembled and attached to the tanks prior to inserting the
SSIS busbars during installation (typically on additional XGIS sections
installed adjacent to the first section).
5.13.3.2 Installing cable side cable connection CTs
1250 A CT mounting
1250 amp range CTs are mounted on single bushings per phase. The
quantity of CTs applied will depend upon the customer requirements
for signals and signal accuracy. Multiple CTs can be mounted on
each phase bushing.
Refer to
to see how the CT bracket attaches to the tank
on two tank faces. Attachment hardware consists of a rear mounting
bracket with horizontal CT braces, a front mounting bracket,
mounting rods with spacers, and fasteners such as washers, lock
washers and nuts (see
).
With the rear mounting bracket fastened to the studs on the vertical
tank surface, fit each phase’s CTs over the bushing and horizontal
mounting rods. Once the CTs are in place, put the spacers over the
mounting rods (if required) and press them and the CTs against the
rear mounting bracket.
Fasten the front 3-phase CT support angle with front CT brackets to
the studs on the horizontal tank surface, sliding the front CT brackets
over the threaded rods. Note that each phase front bracket should
have a protective edge grommet installed around the inner diameter
of the center hole. Use the M10 mounting hardware to secure.
Ensure that all associated hardware is torqued to the appropriate
specification for the respective thread size required to properly
compress the locking washers.
Wire tie the CT signal wires to the underside of the CT support
channels behind the front plates. Attach tie mounts to the tank studs
and wire tie the wires to them. Route the wires into the vertical LV
wire way through a grommet and up into the LV compartment.
Figure 104. 1250A Cable CT assembly
Figure 105.
Change spacer length to accommodate
various CT configurations
1250 A cable CT bracket with rear bracket, braces,
spacers and front bracket.
2000A / 2500 A CT mounting
2500 A range CTs are mounted on dual bushings per phase. The
quantity of CTs applied will depend upon the customer requirements
for signals and signal accuracy. Multiple CTs can be mounted on
each phase’s bushings.
Refer to
to see how the CT bracket attaches to the tank
on two tank faces. Attachment hardware consists of a rear mounting
bracket, a front mounting bracket, mounting rods with spacers, and
fasteners such as washers, lock washers and nuts (see
).
With the rear mounting bracket, fit each phase’s CTs over the
bushings and horizontal mounting rods. Once the CTs are in place,
put the spacers (if required) over the mounting rods and press them
and the CTs against the rear mounting bracket.