GE Industrial Solutions AKD-20 Low Voltage Switchgear - Manuel (Page 21)

AKD-20 Low Voltage Switchgear
Chapter 3. Description
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3-9 Auxiliary/Transition Sections
Sections may be provided for any one or more of several
reasons including:
• Transition to a close-coupled transformer
• Transition to "match and line-up" with existing non AKD-
8/AKD-10/AKD-20 switchgear
• Incoming cable or busway 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 (i.e. utility revenue metering equipment, etc.)
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.
Generally, transition sections will be 22-inches wide for close-
coupling to transformers and "match and line-up" to non-GE
equipments. Transition section width to an indoor AKD-5 or -6
equipment is usually twelve inches. No transition is required to
indoor or outdoor AKD-8 or AKD-10 equipment.
Power company metering requirements generally require either
a 38-inch or 49-inch wide auxiliary section to accommodate the
current transformers, kilowatt-hour meters, demand meters, etc.
as required by their individual practices, tariff schedules, and/or
regulatory commissions.
Figure 3-15 is a front view of a typical instrumentation
compartment.
Protection, instrumentation and control devices are located in
the instrument compartment Fig. 3-16.
1. 24V Power Supply
2. Auxiliary Summing CT
3. Voltage Conditioners
4. Enclosed Fuse Block
Fig. 3-15. Auxiliary/transition section - partial front view
1. Enclosed fuse block
2. Open fuse block
Fig. 3-16. Auxiliary/transition compartments - primary and
secondary circuit fusing
Figure 3-17 illustrates an auxiliary/transition compartment with
switchgear-type relays mounted in semi-flush draw-out cases
(2) installed on the compartment door (1). Space in the
compartment has been used for power management
components and other control devices.
1. Power supply
2. Relays in draw-out cases
3. Auxiliary relays
4. Fuse blocks
5. Compartment door
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