15
A K D - 20 A N D E NTE LLYS I S
LO W VO LTAG E S W I TC H G E A R
All of the primary circuit switching and protective
devices, secondary control and metering devices,
control fuses, instrument transformers, and
Entellisys instrumentation are mounted in the
enclosure. The breaker compartments include
draw-out rails, stationary breaker contacts,
interlocks, Entellisys Messenger, and necessary
control and indicating devices.
The breakers are provided with self-aligning
primary and secondary disconnecting contacts,
breaker locking mechanism, and integral trip unit.
The individual sections, compartments, and
devices are described in the following paragraphs.
Figure 3.2 is an outline of a typical single-ended
load center unit substation illustrating the
nomenclature used for all equipment.
A
A
A
B
B
B
C
C
D
D
D
A
B
Primary section
Transformer
AKD-20 low voltage section
Load center unit substation
Shipping
package
Shipping
package
Transition
section
Shipping
package
Switch unit
Breaker sections
—
Fig. 3.2
Outline of a typical load
center unit substation
