GE SecoGear - Padlock for Open;Close Pushbutton (Optional); Main Bus; Secondary Control; Door-Mounted Devices

DET-882 SecoGear Medium-voltage Switchgear Application and Technical Guide
Standard SecoGear Construction, Features, and Installation
©2017 General Electric All Rights Reserved 59
Figure 6-14: Shutter Padlocking Provision
Padlock for Open/Close Pushbutton (Optional)
A padlock for the Open/Close button will limit the access to
the Open/Close button of the breaker. The Open/Close
button can be operated only when the locking cover is in
the open position.
Figure 6-15: Open/Close Pushbutton Locked
Figure 6-16: Open/Close Pushbutton Open
Main Bus
A SecoGear Metal-clad switchgear vertical section has a
completely enclosed main bus, feeding the upper and
lower compartments with provisions for future extensions
as standard. Main bus materials are copper ASTM B187 for
1200 A and 2000 A rating (1-3/8 in. x 6 in. bar) with two
10 mm x 150 mm plated steel bolts, one bar per phase, at
each bus joint.
The main bus supports have strength suitable to withstand
forces caused by a 31.5 kA or 40 kA RMS symmetrical
short-circuit (82 kA or 104 kA peak). The option of other
materials for bus hardware and ratings is not offered.
Secondary Control
Door-mounted Devices
Protective relays, meters, instruments, controls switches,
indicating lights and test blocks are typically mounted on
the compartment front doors. Devices are mounted
accordingly to the breaker they are associated with. If
there are more devices associated with a particular
breaker than the ones that can be accommodated into a
breaker compartment door, the remaining devices should
be mounted on the adjacent vertical section on an
auxiliary compartment.
Equipment-mounted Devices
Secondary control devices that can’t be mounted in the
compartment door are mounted in suitable locations inside
the compartment.
Ring-type current transformers, designed to meet or
exceed the requirements of ANSI/IEEE C57.13, are mounted
over the stationary primary disconnect bushings,
accessible through the front of the breaker compartment.
A maximum of four (4) CTs with standard accuracy class
(GE/ITI CT 780 & 781 for 1200/2000A) can be mounted per
phase. For the optional high accuracy class CTs (GE/ITI CT
785 & 786) only two (2) can be mounted per phase. See
Table 4-2 for typical ring type CT ratios.
Figure 6-17: CT Mounting in Breaker Compartment