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AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 3. Switchgear Description
Entellisys Instrument/Auxiliary Compartment
(Entellisys AR Only)
Each Entellisys AR low-voltage switchgear lineup contains
standard devices housed within the instrument
compartments (Figure 3.8). Two CPUs (Central Processing
Units) provide the processing capability to support all
switchgear functions. At least one HMI (Human-Machine
Interface) provides user access to the Entellisys system.
Network switches provide communication links between the
CPU, the HMI, the EntelliGuard Messengers, and the external
world. A pair of uninterruptible power supplies (UPS's) and
control power throw-over relays supply highly reliable control
power to these system devices. For additional information
and instructions, reference DEH-501.
CAUTION: The instrument/auxiliary compartment may
contain devices that operate at a variety of different
control voltages including both primary and secondary
sources. Review all equipment drawings, elementary,
remote connection drawings and the summary of
equipment prior to working inside.
Auxiliary/Transition Sections
Sections may be provided for any one or more of several
reasons including:
•
Incoming cable when a main breaker section is not
provided
•
Mounting and wiring of additional metering, relaying,
and control devices requiring more space than
available in a standard instrument panel or
instrumentation compartment (transition or auxiliary)
•
Mounting and wiring of purchaser specified and/or
furnished devices.
Auxiliary sections may be 22-inch, 30-inch, or 38-inch wide as
required to accommodate the space requirements. The
compartment doors on the front of the sections are hinged
and latched in the same manner as breaker compartment
doors.
Figure 3.9 is a front view of a typical instrumentation
compartment.
Figure 3.10 shows examples of primary and secondary
control protection in the instrument compartment.
CAUTION: The instrument/transition compartment may
contain devices that operate at a variety of different
control voltages including both primary and secondary
sources. Review all equipment drawings, elementary,
remote connection drawings and the summary of
equipment prior to working inside.
11
Courtesy of NationalSwitchgear.com
Figure 3.8 Entellisys instrument/auxiliary compartment
CPU's (Central Processing Units)
(1)
Firewall Security Device
(2)
Network Switches
(3)
HMI (Human Machine Interface)
(4)
Figure 3.9 Auxiliary/transition section
24V Power Supply
(1)
Auxiliary Summing CT
(2)
Voltage Conditioners
(3)
Figure 3.10 Primary and secondary fusing
Enclosed Fuse Block (Primary Circuits)
(1)
Open Fuse Block (Secondary Circuits)
(2)
©2016 General Electric. All rights reserved.
DEH-41473
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