Operation; Manual Closing; Introduction - GE AK-2-50 Maintenance Manual

LOW-VOLTAGE POWER CIRCU~T BREAKERS-·
TYPES . AK•SO,
AK-100;
AKF-2C, AKF -2D, AKF-2E
OPERATION
INTRODUCTION .
The instructions contained herein are intended to
aid in the maintenance and repair of basic breakers
and accessories for AK-50-75-100 Low Voltage
Power Circuit Breakers. ·
The basic AK_.50, AK-75 and· AK- 100 breaker
designs have been expanded to include special
designs for specific applications. These design
extensions have caused variations in the nomen-
clature including the following:
AK-2-50, AK-2- 75 or AK-2- 100 - Basic
standard design of breaker for stationary
mounting or for drawout use in AKD type
equipment.
AK-2A- 50, AK-2A-75, · AK-2A-100 - The
A indicates it .has _mounting. features for
AKD- 5 type equipment.
AK-2-50S, AK-2-75S, AK-2-lOOS - The S
indicates breaker is equipped with a quick-
close mechanism · which provides closing
times of approximately 5 cycles (.08 seconds) ..
..
AKU-2-50- - The
u.
indicates an internal
fuse breaker combination:
AKF-2C, AKF-2D, AKF- 2E . - Are field
switches for use in.controlling shunffields
of synchronous m~tQ~s and generators.
. AK- 2-50H - .The H Indicates the inter-
. rupting rating has -been increased to the
75,000 amp. class.. · , _ ·
-
AK- 2- 50C,- AK~2-75C- :.. The C indicates
the interrupting rating has been increased
to the
rno,ooo
amp. class. .
AKT-2- 50 - The· T indicates incr~ased . · ·
continuous rating of 2000 amps.
AK-3-50, AK- 3-75, AK-3-100 - The 3
indicates the breaker ls equippe!i with the
Power Sensor OVercurrent Trip Device.
AK-2- 50X - - The
x ·
indicates the -breaker
has very special features or it "includes _ ·
two or more . of the design extensions
previously described. - .-
When contacting . the factory' it is important
to furnish the complete nameplate· information.
MANUAL CLOSING
For a description of manual closing, refer
to the section of these instructions entitled CLOS-
ING THE BREAKER - MANUALLY OPERATED
AK-50 and section entitled AK-50-75" AND-100
STORED ENERGY MANUAL MECHANISM,
both
under OPERA TING MECHANISMS.
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LEGEND
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CLOSING
MOTOR
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• RELAY COIL
,1, •
RELAY CONTACT
CLOSING 1
SWITCH 1
--::-~J
REMOTE
CLOSE
.x .
F&G •
MECHANICALLY OPfRATED SWITQIES .
· + •
NORMALLY OPEN SWITCH CONTACTS
I •
NORMALLY CLOSED SWITCH COffTAC_!S
L • AUXILIAAY SWITCH CONTACT
SIMPLIFIED ELEMENTARY DIAGRAM
INTERNAL WIRING AK_:50, 75, AND 100·
Fig;l.
lOSING -
1
l'l£MOTE "
.r
r
SWITCH
I
T
' l OSE
I •
I
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E
G
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LEGEND
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fo~lTACTS
( - ANTI-PUMP A£lAT C<J,ITACTS
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~~~~1s?ct•r C Oil
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~TACT:,
<j, -
t.ORMAllT OptN SWITCH CONTACTS
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NORMAU.T ClOS(O SWITCH CONTACTS
INT(~l~.lf1 ~GC~fi~nt~~~U:icR
Fig. lA.
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OIL .
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