Reliance electric FEDERAL PACIFIC DST-2 User manual

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INSTRUCTION
MANUAL
(
;
•
:
'
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TYPEDST
-
I
5
KV
Sr
1510
f
MAGNETIC
AIR
CIRCUIT
BREAKER
IlimilA
DATE
&
APRIL
1372
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FtotottH
Pacific
/
150
Avenue
l
/
Newark
.
New
Jersey
07101
/
201
-
589
-
7500
e
*
s
.
FEDERAL
PACIFIC
flflT
HSU
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NQS
SLBerme
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POINTED
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.
Courtesy of NationalSwitchgear.com

V
:
•
TABLE
OF
CONTENTS
c
PART
I
—
GENERAL
INFORMATION
1
.
Introduction
...
..
1.1
Foreword
1.2
General
Description
.
1.3
Construction
1
A
Features
2
.
Shipping
.
.
3
*
Inspection
.
4
,
Storage
Prior
to
installation
5
.
I
nstallation
.
5.1
Preliminary
Operations
5.2
Safety
Precautions
5.3
Mechanical
Checking
.
5.4
Installation
5.4
.
1
Lifting
5.4
.
2
Arc
-
chute
Fitting
.
.
.
,
.
5.6
Racking
Operations
5.0
Manual
Checking
of
Operating
Mechanism
5.7
Electrical
Checking
of
Operating
Mechanism
'
.
..
.
.
.
PART
If
—
GENERAL
MAINTENANCE
6.1
Periodical
Inspection
6.1
.
1
Arc
-
chute
Inspection
6.1
.
2
Arcing
Contact
inspection
.
6.1
.
3
Replacement
and
Adjustment
of
Arcing
Contacts
.
.
.
6.1
.
4
Main
Contact
Inspection
6.1
.
5
Main
Contact
Replacement
.
.
.
.
6
,
2
Operating
Mechanism
Maintenance
PART
Iff
—
D
ETA
I
LED
MAINTENANCE
PROCEDURES
7
.
Operating
Mechanism
7.1
Characteristics
7.2
Principles
of
Operation
.
,
7.2
.
1
Breaker
Open
-
Closing
Springs
Discharged
7.2
.
2
Breaker
Open
-
Closing
Springs
Charged
7.2
.
3
Breaker
Closed
with
Closing
Springs
Discharged
..
.
.
7.2
.
4
Breaker
Closed
with
Springs
Charged
7.3
Troubleshooting
•
7
,
3.1
The
Breaker
Cannot
be
Closed
•
7.3
.
2
Problem
with
the
Spring
Charging
Motor
or
in
the
Chain
7.3
.
3
The
Breaker
Cannot
be
Opened
Electrically
7.4
Checks
and
Adjustments
.
.
,
7.4
.
1
Adjustment
of
the
Closing
Spring
Mechanical
Lock
.
,
7.4
.
2
Checking
the
Trip
Bar
for
Breaker
Opening
7.4
.
3
Checking
the
Closing
Release
for
Closing
the
Breaker
7.4
.
4
Adjustment
of
the
Clearance
between
the
Ratchet
Pawl
and
the
Sprocket
Wheel
to
Prevent
Overstressing
the
Pitch
Chain
3
3
4
-
’
4
4
*
5
5
5
5
5
5
5
5
:
5
S
7
7
7
7
8
8
9
v
.
“
c
•
'
)
9
9
<
10
10
10
10
IP
V
12
12
12
.
.
flu
12
12
12
12
12
12
12
12
PART
IV
—
APPENDIX
13
7.5
Fitting
,
Replacement
and
Adjustment
of
the
Trip
Latch
7.0
Replacement
of
the
Closing
Spring
.
7.7
Hydraulic
Shock
Absorber
.
.
.
,
7.8
Fining
the
Operating
Mechanism
to
the
Breaker
.
.
,
8
.
Schedule
of
Maintenance
9
.
Operating
Time
&
Contact
Velocities
10
.
Control
Power
Requirements
11
.
Wiring
Diagrams
:
AC
dose
:
OC
close
12
.
Accessories
13
.
Spare
Parts
14
.
Breaker
Contact
Settings
15
.
5
&
15
KV
Arc
-
chute
Assembly
Descriptive
Drawings
j
Refer
to
IN
-
820
,
4
A
for
metahclad
switchgear
installation
,
operation
and
maintenance
instructions
;
13
13
14
14
15
Iff
16
<
17
-
19
19
-
22
23
:
24
'
Courtesy of NationalSwitchgear.com

PART
I
Generali
Information
1
INTRODUCTION
1.1
FOREWORD
Federal
Pacific
.
Electric
Company
apparatus
:
is
built
:
to
the
highest
standard
of
quality
to
insure
continuous
reliable
-
service
with
a
minimum
of
maintenance
.
Some
routine
preventative
maintenance
is
,
however
;
required
,
on
semi
-
annual
or
annual
basis
in
accordance
with
the
various
uses
of
the
product
.
It
is
suggested
that
,
due
to
the
precision
craftsmanship
involved
in
the
construction
of
this
,
appa
-
ratus
,
no
attempts
(
with
the
exception
of
few
minor
adjustments
)
should
be
made
by
the
customer
to
fix
or
adjust
clearances
.
Should
the
need
.
occur
,
the
Field
Service
Department
of
the
.
Power
Equipment
Systems
Division
of
Federal
Pacific
,
Electric
Company
is
equipped
to
assist
you
with
any
maintenance
or
repair
which
may
be
required
throughout
the
anticipated
long
life
of
this
equipment
.
FPE
“
On
-
Site
Tbst
Facilities
"
are
available
to
you
.
This
service
includes
engineering
inspection
and
testing
of
elec
-
trical
equipment
planned
to
supplement
your
regular
main
-
tenance
-
program
,
to
improve
equipment
reliability
and
to
protect
your
investment
.
Such
services
,
for
Metal
Enclosed
,
Metal
Clad
Switchgear
,
and
other
type
Electrical
,
Apparatus
;
are
as
follows
:
(
a
)
Cleaning
of
cells
with
low
pressure
air
,
or
vacuum
.
(
b
)
Inspection
of
cell
bushings
,
cable
connections
and
;
bus
joint
connections
,
(
c
)
General
inspection
of
control
wiring
and
;
components
.
(
d
)
2500
Volt
DC
Megger
Tests
and
DC
Hl
-
pot
Tests
for
Insulation
Reliability
.
(
e
)
Protective
Relay
Calibration
Tests
for
Response
and
Time
Delay
.
(
f
)
5
KV
and
15
KV
circuit
breaker
electrical
and
mech
-
anical
operating
checks
coordinated
with
relay
response
.
(
g
)
Transformer
oil
or
askarel
dielectric
Hi
-
pot
Tests
(
also
on
minimum
oil
breakers
and
tank
type
;
oil
:
breakers
)
.
For
further
information
regarding
service
,
please
contact
the
Manager
of
Field
Service
Department
at
Newark
,
New
Jersey
.
i
i
0
0
23
0
0
r
(
'
‘
-
2
5
kV
73
,
180
and
250
MVA
CIRCUIT
BREAKER
%
.
*
%
•
"
S
'
•
;
*
<
-
r
•
•
*
.
Courtesy of NationalSwitchgear.com

•
%
1.2
GENERAL
DESCRIPTION
fF
/
gw
*
/
/
The
DST
-
2
Magnetic
Air
Circuit
Breakeris
electrically
operated
,
horizontal
drawout
for
uae
in
indoor
and
out
-
door
metaLclad
switchgear
.
It
is
designed
for
international
application
and
service
;
therefore
*
the
dimensional
data
is
given
ixi
both
the
me
*
trie
and
English
systems
.
The
hardware
is
based
on
the
metric
system
.
It
is
composed
of
three
separate
poles
supported
by
a
welded
steel
frame
(
1
)
and
provided
with
wheels
(
2
)
so
it
can
be
easily
moved
in
and
out
of
its
cell
.
Each
pole
consists
of
two
separate
parts
:
(
a
)
Arc
-
chute
(
4
)
-
Is
a
chamber
filled
with ceramic
baffles
.
It
has
a
magnetic
structure
that
forces
the
arc
into
constric
-
tions
provided
by
the
baffling
.
The
magnetic
field
is
generated
by
coils
(
S
)
within
the
arc
chute
.
Cooling
and
elongation
of
the
arc
within
the
baffle
structure
forces
quick
extinction
of
the
arc
,
(
b
)
Contact
unit
-
is
made
up
of
the
main
contacts
,
fixed
(
6
)
and
moving
(
9
)
and
the
arcing
contacts
,
fixed
(
7
)
and
moving
(
10
)
.
The
main
contacts
,
of
silver
plated
copper
,
carry
the
normal
service
current
.
They
are
not
affected
by
the
interruption
since
they
open
before
the
arcing
contacts
separate
.
The
fixed
and
moving
arcing
contacts
are
made
with
tungsten
-
copper
arc
resistant
inlays
and
are
capable
of
•
interrupting
.
high
short
circuit
current
without
damage
.
The
puffer
nozzles
(
8
)
are
located
under
the fixed
contacts
.
The
.
moving
contact
group
is
operated
by
the
shaft
(
11
)
,
through
insulated
:
links
(
12
)
’
.
The
metal
frame
is
grounded
through
the
ground
contacts
(
16
)
.
A
welded
sheet steel
front
barrier
is
grounded
thus
assuring
safety
to
operating
personnel
.
The
contact
structures
are
separated
by
insulated
interphase
barriers
.
Tire
breaker
can
be
either
manually
operated
by
means
of
a
knob
(
13
)
or
Temoteiy
operated
.
The
motor
charged
spring
closing
mechanism
(
3
)
is
espe
-
cially
designed
for
medium
voltage
circuit
breakers
.
It
is
.
.
completely
enclosed
for
safety
and
dirt
exclusion
.
breaker
,
covers
the
live
parts
providing
:
protection
,
to
.
personnel
.
(
1
,
4
DST
-
2
FEATURES
/
/
7
/
#
.
I
unless
otherwise
noted
)
All
breakers
are
equipped
with
the
following
parts
and
provisions
*
(
1
)
Arc
-
chutes
(
4
)
(
2
)
Barrier
(
1
*
Fig
.
2
a
)
(
3
)
5
Unit
auxiliary
switch
with
2
-
‘
a
”
and
2
‘
4
b
”
extra
contacts
(
1
,
Fig
.
5
)
,
Other
types
available
upon
request
,
(
4
)
Lockout
switch
.
(
Blocks
closing
and
motor
circuits
)
(
17
)
(
5
)
Latch
check
switch
(
2
,
Fig
.
5
)
(
6
)
Mechanical
operation
counter
(
counts
trip
operations
)
(
18
)
(
7
)
“
Y
”
relay
(
5
,
Fig
.
5
)
(
8
)
TC
trip
solenoid
and
52
X
close
solenoid
(
3
,
Fig
.
5
)
(
9
)
Charging
motor
(
4
,
Fig
,
5
)
(
10
)
Mechanical
indication
of
“
Charged
”
and
“
Discharged
"
'
“
Open
’
'
*
or
“
Closed
”
.
(
11
)
Mechanical
indication
of
“
Open
”
and
“
Closed
”
(
20
)
(
12
)
Mechanical indication
of
“
Charged
”
and
“
Discharged
”
(
19
)
(
13
)
Mechanical
drawout
interlock
/
prevents
movement
.
of
breaker
in
or
.
out
of
ceil with
contacts
dosed
}
(
14
)
(
14
)
Mechanical interlock
discharges
closing
spring
when
.
inserting
or
removing
breaker
from
cell
.
.
f
(
15
)
Padlock
provision
.
{
Lock breaker
tripped
with
pedal
,
down
or
lock
to
prevent
racking
in
or
out
with
pedal
up
.
(
.
14
)
(
16
)
Provision
for
manual
charging
of
springs
(
21
)
(
17
)
Manuai
trip
-
close control
knob
(
13
)
(
18
)
Automatic
Secondary
contacts
in
“
Connected
”
posi
-
tion
t
22
)
(
19
)
Manually
operated
secondary
contacts
in
“
Test
”
position
,
(
20
)
Mechanism
is
mechanically
and
.
electrically
trip
free
,
:
:
{
-
.
V
•
•
A
y
2
SHIPPING
1.3
CONSTRUCTION
The
DST
-
2
is
a
drawout
type
breaker
.
It
is
built
to
allow
ease
of
maintenance
and
operation
.
The
breaker
is
available
complete
with
ceil
or
for
insertion
into
a
metal
-
clad
breaker
ceil
.
The
breaker
can
be
positioned
as
follows
:
1
.
“
Connected
”
position
—
where
primary
and
secondary
disconnects
are
automatically
connected
.
2
.
“
Test
”
position
(
“
Isolated
”
position
)
-
where
primary
disconnects
are
disconnected
and
secondary
discon
-
nects
,
can
be
manually
connected
or
disconnected
,
.
3
.
Removed
from
the
cell
by
operating
the
“
racking
in
”
lever
,
it
is
provided
with
a
pedal
operated
interlocking
device
(
14
)
,
The
circuit
breaker
is
fitted
with
spring
loaded
,
self
aligning
primary
disconnects
which
engage
the
stationary
studs
mounted
in
insulating
bushings
in
the
cell
(
15
)
.
When
the
breaker
is
in
“
Test
Position
”
or
drawn
out
of
the
.
ceil
,
the
ceil
shutter
,
operated
by
racking
action
of
the
All
circuit
breakers
are
assembled
and
tested
for
optimum
performance
in
the
factory
before
shipment
.
The
5
kV
250
MVA
circuit
breaker
is
shipped
completely
assembled
in
one
crate
.
The
5
kV
350
MVA
and
15
kV
circuit
breakers
.
are
shipped
in
two
crates
.
The
basic circuit
breaker
on
its truck
with
interphase
barrier
is
in
one
crate
.
The
three
arc
chutes
are
packed
in
a
second
crate
.
.
The
serial
number
of
each circuit
breaker
is
on
its
nameplate
,
.
It
is
.
also
sunciied
.
on
both
breaker
frame
.
and
operating
mechanism
frame
as
indicated
in
(
24
,
Fig
.
1
)
,
The
crates
are
marked
with
the
factory
order
number
.
A
copy
of
the
packing
list
,
enclosed
in
a
waterproof
envelope
is
nailed
on
the
outside
of
the
circuit
breaker
crate
.
Only
one
envelope
is
furnished
with
orders
for
more
than
one
circuit
breaker
shipped
to
a
single
destination
.
Each
circuit
breaker
,
in
its
crate
,
is
enclosed
in
a
.
poiy
»
•
ethyelene
dust
-
and
-
moisture
-
proof
bag
.
»
.
•.•
X
.
»
W
+
*
-
.
• •
•
«
.
•
•
%
—
Courtesy of NationalSwitchgear.com

*
«
•
.
.
i
m
’
Ts
(
a
)
Check
the
alignment
between
:
the
ground
contact
(
16
,
Fig
,
l
)
and
the
grounding
blade
located
on
the
cell
floor
,
(
b
)
Insure
that
the
arc
chutes
are
properly
connected
*
(
c
)
Check
,
the
main
and
secondary
electrical
.
connections
.
(
d
)
Never
rack
the
breaker
into
the
“
Operate
-
*
position
without
the
arc
chutes
and
intexphase
barriers
prop
*
erly
installed
.
5
*
3
MECHANICAL
CHECKING
Each
circuit
breaker
is
carefully
inspected
and
operated
at
the
plant
before
shipment
:
yet
it
is
advisable
to
carry
out
some
closing
and
opening
operations
before
putting
a
breaker
into
service
.
For
detailed
,
inspection
remove
arc
chutes
and
interphase
barriers
and
follow
the
instructions
for
“
Manual
Checking
of
Operating
Mechanism
”
(
Section
5.6
)
.
5.4
INSTALLATION
5.4
.
1
Lifting
Lifting
is
to
be
done
as
described
in
Section
4
(
a
)
.
Handle
the
breaker
with
the
utmost
care
,
lift
it
using
a
hoist
or
similar
means
.
Inspect
for
breakage
.
(
See
6
,
1.1
)
5
*
4.2
Arc
chute
fitting
IRg
,
2
a
#
2
b
,
2
c
)
5
kV
350
and
15
kV
Arc
Chute
Mounting
Arc
chutes
are
shipped
separately
from
circuit
breaker
and
must
be
mounted
before
installation
.
Arc
chute
re
*
,
turn
connection
(
8
)
and
.
arc
chute
must
be
positioned
as
follows
:
3
INSPECTION
1
UPON
RECEIPT
OF
SHIPMENT
c
When
a
shipment
of
circuit
breakers
is
received
,
each
crate
should
be
examined
before
it
is
removed
from
the
railroad
car
;
:
or
truck
.
If
any
damage
or
indication
of
rough
handling
,
is
evident
,
a
description
of
the
condition
should
be
written
on
the
freight
bill
,
a
claim
should
be
filed
against
the
carrier
immediately
,
and
notice
of
the
extent
of
damage
sent
without
delay
to
Federal
Pacific
Electric
Co
.
at
the
address
from
which
shipment
was
made
,
giving
serial
number
of
the
breaker
,
the
carrier
’
s
name
,
and
the
car
number
if
shipped
by
rail
.
This
information
enables
the
company
to
supply
needed
information
to
assist
the
purchaser
in
support
of
the
claim
.
(
See
6.1
.
3
)
4
STORAGE
PRIOR
TO
INSTALLATION
A
.
.
breaker
can
be
safely
stored
provided
that
the
following
Instructions
are
observed
:
(
a
)
Handle
the
breaker
with
the
utmost
care
,
lift
circuit
breaker
less
arc
chutes
using
a
hoist
or
similar
means
and
.
attach
the
-
siing
hooks
to
the
holes
on
the
sides
of
the
breaker
.
The
5
and
!
5
kV
circuit
breakers
with
.
arc
chutes
are
lifted
by
fitting
the
sling
under
the
wheel
channels
and
securing
top
to
prevent
tipping
.
(
b
)
Upon
receipt
of
the
breaker
an
inspection
should
be
made
.
;
.
The
.
circuit
,
breaker
should
,
be
stored
,
“
Opened
*
-
and
“
Discharged
”
,
in
its
original
shipping
container
.
The
)
5
kV
and
5
kV
350
arc
chutes
should
be
stored
in
the
original
shipping
crate
.
(
c
)
Keep
the
breakers
in
a
dry
place
,
protected
against
dust
and
chemical
agents
,
preferably
in
ceils
with
ceil
or
auxiliary
heaters
energized
.
/
v
7
i
5
INSTALLATION
5.1
PRELIMINARY
OPERATIONS
Before
setting
a
breaker
into
operation
,
the
following
operations
should
be
carried
out
:
(
a
)
Carefully
clean
all
parts
of
the
breaker
with
a
dry
cloth
.
(
b
)
Check
the
condition
of
contacts
and
terminals
.
The
main
contacts
are
coated
with
a
thin
layer
of
contact
lubricant
.
If
the
main
contacts
are
dirty
they
should
be
cleaned
with
acetone
and
sparingly
reiubricated
with
FPE
^
)
551
A
5853
contact
grease
.
The
terminals
and
arcing
contacts
should
,
be
cleaned
with
acetone
.
The
three
moving
arcing
contacts
must
close
and
open
simultaneously
.
See
.
section
6.1
,
3
,
Page
7
for
adjustment
specification
.
Tighten
all
the
parts
listed
in
Appendix
S
under
"
Maintenance
to
be
carried
out
.
”
r
\
K
a
i
\
v
.
v
5
*
2
SAFETY
PRECAUTIONS
The
following
checks
should
be
made
before
putting
a
breaker
into
service
.
5
kV
75
,
150
AND
250
:
MVA
Figure
2
a
'
Courtesy of NationalSwitchgear.com

It
is
imperative
that
the
arc
chutereturo
connection
(
8
)
:
is
securely
against
arc
chute
support
,
hracket
(
6
)
.
Check
that
both
;
,
nuts
are
tight
;
affording
a
.
good
electrical
;
connections
5
.
B
RACKING
OPERATIONS
'
(
Fig
.
3
a
,
3
b
,
3
c
)
A
-
Racking
In
Procedure
:
(
a
)
With
the
breaker
medianism
at
.
the
;
"
open
"
and
.
spring
“
discharged
"
position
,
roll
the
breaker
onto
die
cell
raua
using
the
;
handling
doily
and
check
that
it
movesfreely
.
NOTE
:
Whenever
the
-
breaker
is
opened
either
electrically
through
a
remote
-
control
switch
or
manually
through
the
trip
-
close
knob
on
the
mechanism
.
This
will
automatically
free
the
-
in
*
locklock
pedal
(
2
)
permitting
the
release
-
of
the
:
interlock
bar
(
1
)
and
removes
power
to
the
.
chafing
motor
.
Electrical
power
to
the
motor
also
may
be
disconnectedly
removing
fuses
in
the
-
power
source
to
the
circuit
breaker
prior
to
any
racking
operations
performed
.
It
is
imperative
that
arc
chute
return
connection
(
8
)
is
securely
against
arc
chute
support
,
plate
(
6
)
.
Check
that
both
nuts
are
tight
affording
a
-
good
electrical
connection
,
-
•
Before
,
fitting
the
arc
chutes
on
the
15
kV
circuit
breaker
or
5
kV
350
,
make
sure
there
is
no
foreign
matter
inside
them
.
Then
:
i
(
a
)
Remove
screws
(
2
)
and
remove
the
interphase
bar
-
rier
(
1
)
.
(
b
)
Lift
arc
chute
with
lifting
yoke
(
Page
18
)
and
fit
the
conductor
pin
(
3
)
-
into
saddles
-
(
4
)
.
Arc
chute
Lifting
station
is
provided
.
in
aide
units
.
(
c
)
Rotate
the
arc
chute
downwards
until
plates
(
6
)
are
fitted
to
stud
(
7
)
,
(
d
)
Fix
the
arc
chute
-
by
means
of
nuts
on
studs
(
7
)
,
making
sure
that
the
connector
(
8
)
is
assembled
outside
of
the
-
plates
(
6
)
.
See
Fig
.
2
b
and
2
c
.
.
support
oiatM
-
(
fT
)
Art
Chut
*
Stud
c
*
*
IXM
'
Washer
.
c
*
*
4
Washer
)
<
i
4
*
7
C
®
)
/
Nuts
adjusted
to
wlddvof
su
ppo
rt
,
platen
Front
.
Arp
.
\
ChuteSupport
.
Arc
Chute
return
connection
Figure
2
b
5
kV
,
75
,
150
and
250
Arc
Chute
Mounting
Arc
chutes
are
shipped
already
assembled
to
circuit
breaker
.
In
the
event
of
arc
chute
removal
,
the
arc
chute
return
connection
(
8
)
and
arc
chute
must
be
positioned
as
follows
:
Are
Chute
support
bracket
«
*
•
>
'
-
'
£
s
:
i
•
V
.
Figure
3
a
Figure
3
b
©
1
Stud
©
i
Washer
Washer
A
/
t
2
-
>
\
A
/
•
\
0
7
*
»
Front
Arc
Chute
support
Arc
Chute
return
connection
3
1
Figure
2
c
Figure
3
c
A
.
.
"
wv
.
\
.
k
b
wJ
lL
.
»
1
.
I
-
CAMV
-
C
Courtesy of NationalSwitchgear.com

•
'
-
•
-
i
.
tr
'
:
&
$
*
(
b
)
Move
the
breaker
to
the
“
test
”
position
using
'
the
racking
lever
(
Fig
.
3
a
)
.
Shift
the
lever
back
;
and
forth
until
hearing
a
clicking
sound
of
"
the
'
interlock
bar
(
1
)
engaging
the
cell
interlock
rail
.
The
interlock
pedal
will
come
upward
and
in
-
dicate
“
blocked
”
.
If
operation
of
the
circuit
,
breaker
.
in
the
"
teat
”
position
is
desired
,
the
se
-
condary
disconnect
contacts
must
be
engaged
;
,
manually
by
sliding
assembly
forward
until
con
-
tact
is
made
with
the
ceil
secondary
assembly
and
the
lockout
switch
(
3
)
must
be
manually
re
-
set
.
[
Replace
power
fuses
(
if
removed
previous
-
ly
)
and
remove
after
completion
of
breaker
oper
-
ations
in
“
test
"
position
.
)
NOTE
:
The
lockout
switch
(
3
)
located
below
the
interlock
pedal
(
2
)
prevents
recharging
the
motor
following
any
racking
:
operations
when
the
pedal
is
depressed
.
(
c
)
To
continue
racking
to
the
“
connected
”
position
,
,
insure
that
the
breaker
has
been
tripped
electri
-
cally
or
manually
and
that
the
closing
springs
:
are
discharged
.
With
the
racking
lever
inserted
{
Fig
.
3
a
)
,
depress
the
interlock
pedal
(
2
)
and
.
rack
breaker
until
the
interlock
bar
falls
secure
-
ly
into
the
interlock
rail
slot
.
Insure
the
inter
-
lock
pedal
position
indicator
shows
“
blocked
”
.
Reset
the
lockout
switch
(
3
)
.
to
permit
eiectricai
operations
and
replace
power
fuses
(
if
removed
previously
)
..
B
*
Racking
Out
Procedure
:
(
a
)
Trip
the
breaker
either
electrically
through
a
remote
,
control
switcn
or
manually
through
the
trip
-
close
knob
on
the
mechanism
.
[
Remove
con
-
trol
source
when
part
of
operating
procedure
)
.
.
(
b
)
With
the
breaker
“
open
'
’
,
place
the
racking
lever
as
shown
in
Fig
.
3
b
.
depress
the
interlock
pedal
(
2
)
and
proceed
racking
to
“
test
”
position
.
Lock
-
out
switch
(
3
)
opens
motor
circuit
.
(
c
)
To
continue
racking
to
the
fuily
withdrawn
po
-
sition
,
operate
the
breaker
manually
to
,
insure
:
that
the
breaker
is
“
open
”
and
“
discharged
”
;
In
-
sert
racking
lever
as
shown
in
Fig
.
3
b
,
.
depress
;
interlock
pedal
(
2
)
and
proceed
racking
until
,
breaker
has
been
fully
withdrawn
from
the
;
cubicle
.
(
d
)
Insert
handling
dolly
and
remove
breaker
;
5.6
MANUAL
CHECKING
OF
OPERATING
MECHANISM
(
Circuit
Breaker
Out
of
Call
)
Charge
the
closing
springs
by
means
of
manual
charging
handle
,
then
close
and
trip
the
breaker
manually
.
Check
mechanical
operation
of
the
mechanism
.
The
breaker
should
operate
smoothly
and
freely
without
any
indication
of
binding
.
Check
that
the
control
voltage
agrees
with
the
breaker
nameplate
and
is
within
the
limits
specified
in
Appendix
10
.
It
is
suggested
that
several
mechanical
closing
and
opening
operations
be
performed
.
5.7
CHECKING
ELECTRICAL
OPERAIION
OF
MECHANISM
The
circuit
breaker
may
be
electrically
operated
safely
in
the
cell
in
the
"
Test
”
position
.
Move
the
breaker
in
the
cell
until
the
interlock
.
bar
drops
into
the
first
notch
.
This
is
the
‘
Test
”
position
.
The
.
shutter
should
remain
down
isolating
the
breaker
from
the
high
voltage
bus
.
The
secondary
circuit
is
completed
by
manually
pushing
the
secondary
contact
operating
handle
(
right
side
of
breaker
.
frame
)
all
the
way
in
(
22
,
Fig
.
1
>
,
Reset
the
lockout
switch
(
17
,
Fig
.
1
)
by
lifting
the
toggle
handle
.
Close
and
trip
the
breaker
several
times
from
the
control
switch
,
After
each
closing
operation
the
motor
will
recharge
the
closing
springs
.
r
V
PART
II
General
Maintenance
ai
PERIODIC
INSPECTION
A
schedule
for
maintenance
of
a
breaker
in
service
is
included
in
Appendix
N
’
o
.
3
;
In
addition
\
o
the
listed
operation
it
is
recommended
to
carefully
clean
the
breaker
at
least
every
six
months
.
The
contacts
and
arc
chutes
should
be
frequently
and
carefully
inspected
,
as
instructed
in
6.1
.
1
-
6.1
.
5
,
if
the
breaker
has
been
subjected
to
frequent
operations
on
short
circuits
or
overload
.
The
breaker
,
and
in
particular
the
operating
mechanism
,
should
be
frequency
inspected
if
the
breaker
has
been
subjected
,
to
dust
or
corrosive
industrial
atmospheres
.
for
defects
,
especially
the
condition
of
the
con
-
strictor
piates
.
(
3
)
If
further
transportation
is
required
,
the
arc
-
chutes
must
be
repacked
,
as
they
were
received
,
in
the
original
crates
.
(
4
)
The
arc
-
chutes
must
not
be
transported
individ
-
ually
lying
on
their
sides
because
of
the
various
fragile
porcelain
parts
.
If
abused
during
hand
-
ling
,
these
critical
parts
will
be
damaged
and
re
-
placement
required
.
(
5
)
Refer
to
1500
B
0068
or
1500
B
0069
attached
as
tvpical
for
parts
description
identification
.
(
SEE
APPENDIX
15
)
Draw
(
he
breaker
out
,
remove
the
safety
barrier
(
!
)
as
instructed
in
5
,
4.2
.
loosen
the
nuts
of
studs
(
7
)
,
rotate
the
arc
chutes
approximately
45
°
backward
one
at
a
time
by
rotating
around
pins
(
3
)
then
check
the
conditions
of
the
arc
chute
plates
.
I
.
\
6
*
1
,
1
Arc
Chute
Inspection
,
Handling
£
r
Construction
(
1
)
Arc
*
chutes
are
to
remain
in
their
crates
until
they
are
to
be
installed
on
the
breakers
.
(
2
)
They
are
to
be
removed
carefully
from
the
crates
:
and
thoroughly
inspected
at
their
final
location
-
*
rtir
?
.
*
;
:
:
*
r
‘
..
iv
-
Tk
.
"
\
2
..
•
tX
-
Courtesy of NationalSwitchgear.com

•
—
*
>
l
.
I
-
i
•
•
•
:
'
^
(
b
)
5
kV
250
,
350
and
15
kV
750
MVAv
-
Remove
.
nut
from
contact
pivot
pin
and
remove
pin
.
Remove
spring
pin
retainer
and
spring
;
pin
;
Remove
?
2
:
shunt
.
;
screws
and
remove
moving
-
arcing
contact
.
Install
new
contact
in
reverse
procedure
.
.
ISkV
500
-
Remove
*
3
studs
securing
moving
.
arcing
contact
,
to
the
blades
;
Install
:
,
new
contact
making
certain
that
nuts
are
securely
tightened
.
(
c
)
Remove
stationary
arcing
contact
springs
(
5
)
(
Fig
.
4
b
and
4
c
)
by
removing
adjusting
nuts
and
stud
.
Remove
upper
shunt
screw
.
Remove
arcing
contact
assembly
,
remount
shunt
onto
new
arcing
contacts
and
install
in
reverse
procedure
.
(
d
)
Adjust
the
moving
arcing
contact
,
making
sure
that
.
•
'
all
3
poles
close
simultaneously
and
fixed
to
moving
:
main
contact
gap
as
arcing
contacts
touch
:
5
kV
250
3
8
t
l
.
mm
(
.
32
±
.
04
in
.
)
;
5
kV
350
»
4
i
1
mm
(
.
160
±
.
04
in
.
)
;
15
kV
«
ll
±
:
2
mm
(
,
44
±
.
08
in
.
}
.
Contacts
may
be
slowly
closed
using
the
mainte
-
.
nance
bar
(
23
,
Fig
.
1
)
for
the
5
kV
breaker
,
and
“
Maintenance
Close
Device
"
(
Page
.
19
)
for
the
.
15
kV
breaker
;
(
e
)
Close
the
breaker
(
Fig
,
4
c
)
and
adjust
the
length
;
of
springs
(
5
)
to
11
±
$
mm
(
.
44
±
in
.
)
for
15
kV
500
and
14.5
(
.
57
±
;
{
Jg
'
in
.
)
for
.
—
other
ratings
.
(
0
-
Open
and
close
,
the
breaker
several
times
to
check
mechanical
operation
.
.
(
g
)
Remount
.
the
arc
chutes
and
the
interphase
barrier
as
instructed
in
5.4
.
2
,
If
any
breakages
or
flaws
on
arc
chutes
or
ceramic
plates
or
burning
on
blow
-
out
coils
are
found
,
it
is
advisable
to
replace
the
arc
chute
.
Replacement
arc
chutes
may
b
®
ordered
direct
from
the
factory
,
by
contacting
Switchgear
Marketing
,
Newark
,
New
Jersey
.
6.1
*
2
.
Arcing
Contact
Inspection
Draw
the
breaker
out
.
remove
1
the
interphasc
barrierand
arc
-
chutes
.
The
arcing
contacts
should
be
reasonably
dean
,
without
pits
and
deformations
.
Small
pits
can
be
filed
without
modifying
the
shape
of
the
contacts
.
.
In
normal
use
,
when
currents
of
approximately
the
rated
value
are
being
inter
*
rupted
,
the
arcing
contacts
might
be
slightly
worn
;
replace
-
ment
,
however
,
is
unnecessary
.
In
more
severe
service
'
when
appreciable
wear
is
noticed
,
the
arcing
contacts
should
be
replaced
as
described
in
6.1
J
..
Appendix
No
.
8
indicates
the
maximum
number
of
oper
*
ations
the
breaker
should
be
expected
to
perform
without
replacement
of
the
contacts
.
6.1
.
3
Replacement
and
Adjusting
of
Arcing
Contact
(
Figure
4
)
Draw
the
breaker
out
,
remove
theinterphase
barrier
and
arc
chutes
(
Fig
.
2
)
.
Replace
the
arcing
contacts
as
follows
:
(
a
)
Open
the
breaker
and
discharge
the
closing
springs
.
r
©
©
\
2
s
Wk
Or
(
©
SkV
75
,
150
.
250
AND
350
,
o
.
)
AND
15
kV
750
O
.
©
3
©
“
Closed
”
Position
“
Open
”
Position
FIgure
4
a
Figure
4
b
"
.
JVI
'
I
*
'
"
:
'
.
-
.
'
7
,
Courtesy of NationalSwitchgear.com

I
*
.
6.1
.
5
Main
Contact
Replacing
Draw
the
breaker
out
,
remove
the
interphase
barrier
and
arc
,
chutes
;
Replace
.
the
main
con
tacts
:
as
follows
:
(
Fig
;
'
4
d
)
-
.
(
a
)
Open
the
.
breaker
and
discharge
the
closing
:
springs
.
(
b
)
Remove
the
spring
by
unscrewing
the
locknut
and
.
removing
the
adjusting
.
screw
,
Rfentove
main
contact
;
Install
new
contacts
in
reverse
procedure
;
NOTE
:
;
Mew
self
locking
nut
should
be
used
.
(
c
)
Adjust
the
main
contact
springs
so
that
the
-
length
is
10
±
.
5
mm
(
.
40
±
.
020
in
.
)
when
the
:
contacts
are
closed
.
8
L
1
.
A
-
Main
Contact
Inspection
Draw
the
breaker
out
,
remove
the
interphase
barrier
,
and
tilt
,
the
arc
chute
back
approximately
45
°
one
at
a
time
;
.
Inspect
the
main
contacts
making
sure
they
are
in
good
condition
and
see
that
the
face
of
the
contact
is
coated
,
lightly
,
with
FPE
#
1551
A
5853
Contact
Lubricant
.
Use
only
minute
quantity
.
Since
these
contacts
do
not
break
any
current
they
should
not
be
pitted
or
burnt
.
(
See
Appendix
8
for
the
number
of
operations
the
main
contact
can
withstand
before
replacement
is
necessary
.
)
1
SkV
SOOMVA
(
.
44
*
;
»
«
;
in
.
W
f
v
.
MINIMUM
CLEARANCE
WITH
CONTACTS
ENGAGED
-
.
25
mm
(
,
01
Im
)
Locknut
t
All
othvrrat
Ings
:
i
4
.
ai
(
.
S
7
ir
;
«
|
inr
|
/
.
1
0.5
mm
a
:
-
S
r
m
I
*
7777
T
/
n
'
u
J
l
\
s
10
lOiSmm
{
.
40
±
.
020
in
.
)
*
S
*
MINIMUM
CLEARANCE
WtTH
CONTACTS
ENGAGED
*
<
25
m
nr
LOT
In
.
)
;
i
/
.
•
.
"
4
MAIN
CONTACTS
Rgyr
«
44
\
"
\
:
ARCING
CONTACTS
Figure
4
o
/
(
r
-
6.2
OPERATING
MECHANISM
MAINTENANCE
f
Figure
9
a
and
9
b
)
To
check
1
contact
'
alignment
,
'
ustf
maintenance
close
handles
(
see
Accessories
Section
)
.
The
operating
mechanism
is
supplied
thoroughly
lubricated
and
does
not
need
any
special
care
during
its
lifetime
.
It
is
*
.
•
however
,
advisable
to
clean
it
carefully
after
every
2009
Check
primary
disconnect
lingers
to
assure
that
they
are
operations
or
once
a
year
,
whichever
comes
first
,
positioned
in
a
circle
,
not
bent
,
and
clean
of
residue
*
Primary
Disconnect
Inspection
The
cleaning
should
be
done
by
means
of
a
paint
brush
drenched
with
acetone
or
$
ther
similar
solvent
with
the
breaker
“
Open
’
*
and
springs
‘
"
Discharged
”
.
The
links
,
levers
,
pins
and
chain
drive
mechanism
.
.
should
be
lubricated
with
good
quality
grease
-
-
Exxon
.
Grease
Nebula
EP
-
1
is
recommended
.
Secondary
Disconnect
Inspection
Check
molded
contact
assembly
and
moving
carriage
assem
-
bly
to
assure
they
they
are
not
damaged
and
that
the
contact
pins
are
not
bent
.
p
m
ri
O
I
s
SPRING
CHARGING
MOTOR
<
4
)
1
i
I
J
1
O
O
H
L
<
c
O
ft
i
r
4
t
O
CD
^
LATCH
SWITCH
(
2
)
<
S
>
0
<
z
>
v
.
(
TC
)
SHUNT
TRIP
OR
-
?
(
52
X
)
CLOSE
ASSEMBLY
(
3
)
ML
<
D
l
4
?
AUXILIARY
SWITCH
(
1
)
Y
RELAY
ASSEMBLY
(
6
)
FIGURE
5
'
*
•
•
>
*
.
V
r
*
Vi
-
Am
.
Courtesy of NationalSwitchgear.com

.
1
:
'
f
.
•
.
PART
111
—
Detailed
Maintenance
Prctcedyli
T
OPERATING
MECHANISM
(
TYPE
”
AE
#
I
"
)
f
1
7.2
PRINCIPLES
QFOPERATIQN
The
operating
position
!
ofi
the
mechanism
:
are
-
described
and
:
.
shown
in
the
following
:
pages
,
7.2
.
1
Breaker
Open
—
ClosingSprings
(
1
)
Discharged
(
Figure
6
a
)
The
breaker
is
in
this
position
after
each
"
C
!
ose
*
Open
"
cycle
before
recharging
.
This
is
a
transient
position
.
7.2
.
2
Breaker
Open
—
Closing
Springs
(
1
)
Charged
(
Figure
6
b
)
This
is
the usual
operating
position
of
the
open
breaker
.
The
springs
can
be
charged
as
follows
:
(
Fig
.
6
a
)
,
.
(
a
)
Manual
Charging
.
Turn
the
shaft
(
3
)
half
a
turn
clockwise
using
the
crank
(
2
)
.
This
corresponds
to
complete
charging
of
the
springs
.
When
the shaft
(
3
)
is
rotated
,
it
drives
the
.
shaft
(
5
)
by
means
of
the
-
chain
(
4
)
.
The
-
shaft
,
being
con
-
nected
to
lever
(
6
)
through
connecting
,
rod
(
7
)
and
.
crank
.
(
8
)
causes
,
in
its
turn
,
the
charging
of
the
springs
.
7
;
T
CHARACTERISTICS
The
:
closing
-
springe
,
of
the
operating
mechanism
are
charged
by
the
motor
.
The
spring
charging
time
is
approximately
10
seconds
;
.
The
mechanism
performs
the
following cycles
:
(
a
)
Starting
,
with
the
breaker
open
and
springs
charged
:
CO
CO
•
TC
CO
TC
Where
:
CO
is
a
“
Gose
«
Qpen
”
operation
TC
is the
Spring charging
time
(
b
)
Starting
with
-
the
breaker
closed
and
springs
charged
;
CO
TC
0
CO
-
t
Where
:
0
is
an
“
Open
”
operation
t
is
the
reset
time
;
*
BREAKER
OPEN
:
CLOSING
SPRINGS
DISCHARGED
0
.
©
®
®
0
©
16
®
©
@
v
.
>
;
©
Figure
6
A
.
~
..
7
i
^
’
^ ^
,
nr
!
7
:
r
/
0
?
r
*
'
*
r r
:
,
©
:
rTT
;
trrm
r
*
*
»
«
«
IV
—
'
“
•
*
Courtesy of NationalSwitchgear.com

•
©
BREAKER
CLOSED
:
(
my
f
CLOSING
SPRINGS
CHARGED
\
BREAKBROPEN
:
CLOSING
SPRINGSCHARGED
(
\
5
Figure
6
B
BREAKER
CLOSED
:
CLOSING
SPRINGS
DISCHARGED
*
OPERATING
KNOB
{
2
)
TURNED
COUNTERCLOCKWISE
.
BREAKER
CLOSED
:
CLOSINGSPRINGS
DISCHARGED
3
^
-
.
i
!
oommLt
40
^
.
040
m
»
)
©
©
(
0
to
.
063
In
)
Figure
6
C
At
the
end
of
this
motion
the
trip
latch
assumes
the
latch
position
.
When
fully
charged
.
'
the
primary
closing
latch
(
13
)
is
held
fixed
by
the
secondary
closing
latch
(
15
)
on
shaft
(
16
)
by
means
of
bearing
(
14
)
assuring
the
springs
are
kept
charged
.
The
sprocket
wheel
(
17
)
is
then
free
from
ratchet
(
18
)
and
idles
.
The
breaker
will
not
dose
if
springs
(
1
)
are
not
completely
charged
.
Although
the
spring
charging
can
be
done
manually
as
described
above
,
,
the
usual
procedure
is
to
perform
this
operation
by
means
of
a
motor
.
Figure
7
(
b
)
Motor
Charging
,
When
motor
(
19
)
is
energized
,
it
rotates
camshaft
(
20
)
through
the
reduction
gear
(
21
)
;
the
clutches
(
22
)
are
actuated
in
such
a
way
as
to
charge
the
springs
in
the
same
way
it
is
done
manually
(
see
6
a
.
»
.
If
during
the
operation
,
the
voltage
supply
fails
,
the
motor
is
always
in
a
position
to
continue
charging
once
the
power
is
restored
.
Charging
can
of
course
be
continued
manually
,
if
necessary
.
•
;
V
'
v
.
j
\
r
.
..
ra
.
«
.
.
-
Courtesy of NationalSwitchgear.com

7.4
.
2
Checking
the
Trip
Bar
(
8
)
for
Opening
tha
Breaker
(
Figure
7
}
When
the
breaker
is
ciosed
,
the
clearance
between
.
the
pin
(
9
)
of
the
trip
lever
(
lQ
)
and
the
trip
rod
(
8
)
actuated
by
the
knob
(
2
)
is
td
be
2.5
to
4
mm
(
.
098
to
.
16
in
.
)
.
Should
this
clearance
be
less
,
the
pin
(
9
)
would
hit
the
trip
bar
(
8
)
thus
tripping
the
breaker
.
Therefore
,
it
is
necessary
to
check
that
.
(
a
)
The
trip
bar
(
8
)
is
not
warped
and
is
not
held
upward
by
foreign
matter
.
(
b
)
That
the
pins
(
I I
)
are
provided
with
washers
and
split
rings
.
(
c
)
That
the
lever
(
12
)
is
not
warped
and
moves
freely
.
(
d
)
That
the
spring
(
13
)
is
fastened
securely
.
7
X
3
Breaker
Closed
with
Closing
Springs
-
Discharged
(
Figure
6
cj
~
This
is
a
transient
state
for
the
breaker
It
occurs
whenever
the
breaker
is
ciosed
and
before
the
-
springs
are
recharged
;
The
breaker
mechanism
is
changed
to
this
position
as
follows
:
The
shaft
(
16
)
is
rotated
either
by
the
electrical
close
operation
or
manually
with
knob
(
23
)
.
The
latch
(
13
)
is
released
and
springs
(
1
)
rotate
the
lever
(
6
)
counter
-
clockwise
.
This
drives
the
shaft
(
25
)
clockwise
through
lever
(
11
)
and
trip
link
and
closes
the
breaker
.
7
X
4
Breaker
Closed
with
Springs
Charged
(
Figure
6
d
)
This
is
the
usual
operating
position
of
the
closed
breaker
*
The
trip
operation
can
be
performed
as
follows
:
(
a
)
Manually
,
by
rotating
knob
(
23
)
.
(
b
)
Remote
,
through
the
shunt
trip
.
73
TROUBLE
SHOOTING
7
X
1
When
the
Breaker
Cannot
be
Closed
This
may
be
due
to
the
following
:
(
a
)
Looseness
of
the
eccentric
(
6
,
Fig
.
7
)
-
adjust
as
instructed
in
7.4
.
1
.
(
b
)
Wajpage
of
the
trip
rod
(
8
,
Fig
.
7
)
-
check
as
instructed
in
7.4
.
2
.
(
c
)
Wear
of
lever
(
7
,
Fig
.
7
,
Page
10
)
.
-
This
trouble
is
very
uncommon
and
may
occur
after
a
number
of
operations
much
greater
than
,
that
recommended
.
The
iever
(
7
)
is
to
be
replaced
at
our
plant
or
by
an
FPE
:
F
ieid
Servi
ce
.
E
ngin
eer
.
(
d
)
Clearance
between
the
ratchet
pawl
(
3
,
Fig
,
8
)
and
the
sprocket
wheei
(
4
,
Fig
.
8
)
is
different
from
the
prescribed
clearance
.
-
See
7.4
.
4
for
adjustment
.
7
X
2
Problem
with
the
Spring
Charging
Motor
or
in
the
Chain
(
16
)
(
Figure
8
)
This
happens
if
the
clearance
between
the
ratchet
pawl
(
3
)
and
the
sprocket
wheel
is
incorrect
.
See
7.4
.
4
for
adjustment
.
7.3
,
3
The
Breaker
Cannot
be
Opened
Electrically
This
may
be
due
to
the
auxiliary
circuit
not
being
closed
.
Verify
the
circuits
and
their
connection
to
the
switchgear
terminal
blocks
.
74
CHECKS
AND
ADJUSTMENT
7.4
J
Adjustment
of
the
Closing
Spring
Mechani
-
cal
Lock
(
Figure
7
)
Since
this
adjustment
is
to
be
made
with
the
breaker
closed
,
the
eccentric
(
6
,
Fig
.
7
)
should
First
be
locked
by
tightening
screw
(
1
)
in
such
a
way
as
to
position
the
lobe
opposite
the
pin
(
7
)
;
then
,
with
the
breaker
ciosed
and
springs
discharged
,
perform
the
following
operations
:
(
a
)
Loosen
screw
{
!
)
slightly
.
(
b
)
Turn
knob
(
2
)
counter
-
clockwise
until
the
clearance
between
the
lever
(
3
)
and
the
pin
(
4
)
of
trip
bar
(
5
)
is
between
.
0
and
.
063
inch
(
0
and
1.6
mm
)
.
(
c
)
Rotate
the
eccentric
(
6
)
until
it
is
touching
pin
(
7
)
of
knob
(
2
)
;
lock
it
in
this
position
by
tightening
the
screw
(
I
)
,
7.4
,
3
Checking
the
Closing
Release
(
7
)
for
Closing
the
Breaker
(
Figure
8
)
With
breaker
open
and
springs
discharged
:
(
a
)
Check
for
free
movement
of
closing
release
bar
(
7
)
and
make
sure
that
when
ft
is
in
the
stop
position
,
the
right
end
of
lever
(
6
)
is
stopped
by
the
siot
(
9
)
in
the
dividing
plate
.
(
b
)
Roller
(
5
)
should
engage
lever
(
6
)
with
a
mini
-
.
.
mum
overlap
of
1.5
mm
(
.
06
in
.
)
.
Overlap
is
the
vertical
measurement
from
point
of
roller
con
-
tact
to
rip
of
latch
.
s
'
-
*
"
/
\
V
‘
J
7.4
.
4
Adjustment
of
the
Clearance
between
the
Ratchet
Pawl
(
3
)
and
the
Sprocket
Wheel
(
4
)
.
to
prevent
undue
stresses
to
the
Chain
or
to
the
Spring
Charging
Motor
(
Figure
8
)
:
Starting
from
spring
"
Discharged
’
*
(
1
)
position
,
rotate
the
.
shaft
(
2
)
half
a
turn
ciod
&
vise
,
which
corresponds
to
the
:
full
closing
spring
charging
;
The
ratchet
pawl
(
3
)
must
clear
the
sprocket
wheel
(
4
)
at
'
the
instant
when
the
bearing
(
5
)
presses
against
the
upper
part
of
lever
(
6
)
of
dosing
release
bar
(
7
)
,
thus
assuring
the
spring
"
Charged
”
position
.
If
the
ratchet
pawl
(
3
)
clears
the
sprocket
wheel
(
4
)
before
the
bearing
{
$
)
presses
on
the
lever
(
6
)
,
the
closing
springs
(
1
)
are
not
completely
charged
and
the
breaker
cannot
be
closed
.
If
,
on
the
other
hand
,
the
ratchet
pawl
(
3
)
clears
the
sprocket
wheel
(
4
)
after
the
bearing
(
5
)
has
pressed
on
the
lever
(
6
)
,
the
pitch
chain
(
16
)
would
be
subjected
to
undue
stresses
and
the
motor
would
be
excessively
overloaded
.
Therefore
,
with
the
springs
in
"
Charged
”
position
,
the
clearance
between
the
ratchet
pawl
(
3
)
and
the
sprocket
•
wheel
(
4
)
must
be
4
t
.
Smm
(
.
16
±
.
02
inch
)
.
This
is
set
by
-
adjusting
the
eccentric
(
8
)
fixed
to
the
base
plate
to
get
the
clearance
required
.
The
manual
charge
crank
will
override
if
an
operator
continues
to
charge
after
the
mechanism
is
fully
charged
.
This
prevents
possible
damage
to
the
mechanism
.
.
JO
r
’
rrt
-
&
*
•
-
j
-
=
lW
.
-
Courtesy of NationalSwitchgear.com

4
*
.
Sit
»
m
(
7
)
Mft
t
&
Z
M
©
9
t
-
Figure
8
*
PART
IV
—
Appendix
APPENDIX
7.5
©
3
}
4
Fitting
,
Replacement
and
Adjustment
of
the
Trip
Latch
(
Fig
,
10
)
,
(
a
)
Open
the
breaker
and
discharge
the
springs
,
(
b
)
De
-
energize
the
auxiliary
circuits
,
(
c
)
Charge
the
.
closing
springs
until
the
Trip
Linkage
system
latches
in
the
position
shown
,
Fig
,
10
,
(
d
)
Remove
the
split
washer
(
2
)
and
slip
out
the
pin
(
3
)
,
(
e
)
Lift
the
lever
(
4
)
by
operating
trip
lever
pin
(
5
)
,
(
0
Remove
the
clips
and
washers
from
pin
(
6
)
.
.
(
g
)
Disengage
the
trace
reset
springs
(
9
)
,
(
h
)
Remove
the
trace
.
.
Adjustment
of
linkage
length
is
made
by
screwing
,
in
or
out
,
of
the
right
part
into
,
the
left
part
of
the
assembly
(
item
-
7
and
.
8
)
.
(
i
)
Adjust
the
new
assembly
length
(
L
)
to
equal
the
.
length
of
the
one
removed
.
•
(
j
)
To
reassemble
,
reverse
the
above
steps
.
L
J
{
O
’
l
\
U
\
\
‘
\
Jki
\
©
©
©
;
t
9
)
(
3
)
.
figure
10
APPENDIX
7.6
(
Type
"
AEM
"
Mechanism
Only
)
Replacement
of
Closing
Springs
(
Fig
.
8
)
.
THe
dosing
springs
can
be
fitted
with
the
help
of
3
hook
(
Figi
11
)
which
will
be
supplied
on
request
,
as
follows
:
(
a
)
Insert
a
Smm
(
.
20
inch
)
dia
.
pin
into
hole
(
A
)
of
closing
spring
support
(
18
)
.
(
b
)
Fit
the
hook
to
the
pin
and
insert
the
threaded
portion
of
the
hook
into
the
hole
drilled
in
the
left
part
of
the
operating
mechanism
housing
,
(
c
)
By
means
of
the
nut
supplied
with
the
hook
,
charge
:
the
springs
until
pin
(
15
)
can
be
fitted
.
(
d
)
Remove
the
hook
and
check
the
spring
charging
operation
.
W
d
/
v
•
•
^
w
S
'
Rgur
*
11
13
’
.
.
..
.
*
>
•
Courtesy of NationalSwitchgear.com

APPENDIX
M
APPENDIX
7.7
Fitting
the
Operating
Mechanism
to
the
Main
Breaker
.
The
DST
-
2
is
shipped
as
one
unit
:
with
the
-
operating
mechanism
mounted
on
the
main
breaker
.
If
,
however
,
it
becomes
necessary
to
remove
the
mechanism
it
shouid
be
refitted
horizontally
as
shown
in
(
Fig
.
9
a
)
,
using
the
hoies
in
the
frame
as
.
indicated
in
(
Fig
.
9
b
)
.
Hydraulic
Shock
Absorber
Check
Shock
Absorber
for
any
signs
of
leakage
and
for
moving
contact
stopping
without
reboundi
An
accurate
’
check
couid
only
be
made
using
:
a
.
travel
analyser
.
Rebound
is
adjusted
,
by
shifting
;
mounting
brackets
as
shown
.
7
i
es
£
e
-
f
m
D
§
I
/
|
S
:
i
.
i
\
V
RQUI
*
12
I
>
4
(
i
I
\
5
®
I
\
Ms
.
’
»
i
\
s
)
ii
l
id
-
.
wfflm
Figure
9
*
LOOSEN
|
4
>
1
SCREWS
AND
ADJUST
3
kU
5
jcc
.
pt
SkV
350
,
3000
A
©
4
s
°
Position
(
9
V
"
.
0
O
f
Oi
&
m
i
)
!
i
©
s
Q
(
o
•
*
«
*
i
0
'
*
LOOSEN
{
4
)
SCREWS
AND
ADJUST
e
-
l
O
/
*
O
/
©
o
1
©
T
\
MORE
DAMPENING
"
S
LESS
DAMPENING
®
Figure
12
b
Figure
9
b
NOTE
:
Mechanism
should
be
assembled
*
in
the
*
kOpen
”
.
;
position
and
closing
springs
“
Discharged
”
.
Moving
contacts
shouid
be
in
the
“
Fully
Open
”
position
.
6
kV
380
.
3000
A
and
ISfcV
APPENDIX
8
RECOMMENDED
MAINTENANCE
SCHEDULE
FOR
THE
DST
-
2
TYPE
BREAKER
NUMBER
OF
OPERATIONS
5
kV
250
&
15
kV
500
=
10
,
000
max
,
SkV
350
&
15
kV
750
«
*
5
,
000
max
.
Every
4000
MAINTENANCE
TO
BE
CARRIED
OUT
Every
2000
Or
Once
Annually
,
if
Less
Arc
chutes
O
)
Main
contacts
Arcing
contacts
(
2
)
Main
contact
lubrication
Tightening
of
nuts
,
screws
,
etc
.
Tightening
of
connections
,
shunt
trip
Operating
mechanism
chain
.
Auxiliary
contacts
on
the
:
op
«
ratirtg
.
mechanism
Closing
release
latch
X
z
X
-
I
X
x
V
.
.
•
;
'
X
(
a
I
X
X
X
X
-
.
.
.
.
.
14
-
.
'
.
til
*
"
V
*
—
•
Courtesy of NationalSwitchgear.com

•
•
rVH
*
-
*
;
‘
*
•
•
(
2
)
The lifetime
of
arcing
contacts
depend
on
the
nature
of
operations
.
Their
;
condition
is
to
be
-
inspected
:
replacement
is
-
required
when
their
wear
;
is
;
noticeable
.
Numbers
of
operations
that
the
arcing
contacts
can
withstand
without
being
replaced
are
indicated below
.
(
1
)
The
arc
chutes
can
withstand
,
without
being
serviced
:
(
Interruptions
with
the
full
short
-
circuit
current
at
rated
voltage
co
$
Q
»
0
.
l
5
Interruptions
with
rated
current
ratedvoitage
cos
^
»
0
,
8
Mechanical
Operations
interruptions
with
the
full
short
-
circuit
current
at
ratedvoitage
cos
<
s
&
«
0
,
15
Interruptions
with
rated
current
at
rated
voltage
cos
0
=
0
,
8
with
,
in
,
spection
every
with
in
-
spection
after
number
replace
-
ment
with
in
-
spection
every
number
number
*
.
*
K
10
,
000
2
,
000
2
,
000
5
,
000
1
duty
as
re
-
quired
1
duty
cycie
5
,
000
cycie
APPENDIX
9
OPERATING
.
TIME
St
.
CONTACT
VELOCITIES
OF
DST
-
2
-
6
&
15
kV
Closing
Time
in
Milliseconds
Opening
Time
in
Milliseconds
Closing
Velocity
in
Ft
/
Sec
Opening
Velocity
in
Ft
/
Sec
Circuit
Breaker
5
kV
75
-
1200
A
5
kV
150
-
1200
A
5
kV
250
-
1200
A
SkV
3
S
0
-
120
OA
60
-
70
40
-
50
17
,
0
-
18
,
7
12.4
-
14.1
SkV
250
-
2000
A
5
KV
350
-
2
Q
00
A
&
.
3000
A
60
-
70
40
-
50
44
,
4
-
17.0
12.4
-
14.1
lSkV
ISO
-
1200
A
15
kV
250
-
1200
A
15
kV
500
-
1200
A
15
kV
500
<
£
7
S
0
-
1200
A
70
-
80
40
-
50
.
18.7
-
20.3
14.4
-
15.7
(
15
kV
500
-
2000
A
ISkV
750
-
2000
A
St
,
3000
A
70
-
80
40.50
14.4
-
15.7
16.4
-
18.0
Note
:
Closing
velocity
measured
in
area
114
inch before
“
arc
contact
touch
”
to
“
arc
contact
touch
”
.
Opening
velocity
measured
in
area
from
“
arc
contact
touch
”
to
Hi
inch
from
“
arc
contact
touch
”
APPENDIX
10
DST
-
2
AIR
CIRCUIT
BREAKER
CONTROL POWER
"
REQUIREMENTS
AVAILABLE
TRIPPING
VOLTAGE
115
VAC
230
VAC
CAPACITOR
TRIP
Voltage
.
Nominal
24
VDC
48
VDC
250
VDC
!
25
VDC
208
—
254
Voltage
Range
140
—
280
14
-
28
28
-
56
104
-
127
70
-
140
Current
Required
(
Intermittent
)
At
Nominal
Voltage
0.1
max
.
12.5
6.25
^
4
1
I
•
*
»
-
0.1
max
.
1
None
Recommended
Fuse
None
None
None
None
None
AVAILABLE
SPRtNG
CLOSING
MOTOR
VOLTAGES
Voltage
^
Nominal
230
VAC
115
VAC
48
VDC
125
VDC
250
VDC
208
-
254
Voltage
Range
100
-
140
104
-
127
38
-
56
200
-
280
V
.
Current
Required
2.6
5.3 5.2
14
2.65
1
*
Recommended
Fuse
(
FPE
ECN
25
0
V
Dual
Element
)
1.6
8
3.2
3.2
1.6
•
:
.
..
!
'
.
.
.
Courtesy of NationalSwitchgear.com

.
*
*
;
•
AVAILABLE
CLOSING
.
RELEASE
COIL
VOLTAGES
^
Voltage
,
Nominal
125
VDC
48
VDC
2
S
0
VDC
115
VAC
230
VAC
•
'
>
*
~
104
—
127
.
!
-
200
—
-
280
Voltage
Range
:
38
-
56
100
-
140
208
—
254
Current
Required
At
Nominal
Voltage
6.25
2.4
1.2
.
4.4
7
n
Recommended
.
Fuse
(
FPEECO
<
8
>
25
QV
One
-
time
:
Cartridge
)
10
10
10
10
10
/
*
Use
fuse
recommended
for
motor
circuit
when
close
and
motor
circuit
have
common
power
supply
.
APPENDIX
If
f
WIRING
DIAGRAM
i
.
£
'
69
M
0
jgyy
t
-
.
C
+
JfA
/
-
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*
1
r
#
Mt
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±
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—
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)
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r
I
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—
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-
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C
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*
APPENDIX
12
Standard
and
Optional
Accessories
r
i
HANDLING
DOLLY
DWG
*
NO
.
2251
C
5391
^
Optional
)
SPRING
CHARGING
CRANK
DWG
,
NO
*
1551
A
5539
(
Standard
)
•
l
.
Position
dolly
against
left
side
of
racking
handle
engage
-
ment
block
.
and
with
lifting
angle
under
frame
.
2
.
Rotate
lever
by
pressing
on
right
side
until
circuit
breaker
front
wheels
are
off
the
ground
.
3
.
Circuit
breaker
could
now
be
pushed
in
any
direction
.
4
.
Disengage
by
pressing
on
left
side
and
then
allowing
lever
to
rotate
upward
.
1
.
Attach
crank
to
.
square
shaft
at
front
left
of
mechanism
.
2
.
Rotate
until
ratcheting
ceases
.
The
closing
springs
are
then
charged
.
i
>
:
LEVER
:
*
HANDLING
DOLLY
CIRCUIT
BREAKER
FRONT
CHANNEL
/
?
*
\
i
x
V
I
A
*
CIRCUIT
BREAKER
WHEELS
MECHANISM
CRANK
v
i
.
ccff
-
.
-
sr
.
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^
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.
.
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'
•
.
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'
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.
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.
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-
•
.
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-
•
•
T
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-
T
-
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/
-
*
.
"
'
1
'
‘
Courtesy of NationalSwitchgear.com

i
RACKING
HANDLE
,
DWG
.
NO
.
2251
B
6442
(
Standard
)
n
n
o
*
/
•
/
/
7
/
/
/
f t
/
/
/
/
v
/
i t
RACK
OUT
RACK
IN
if
/
/
•
/
“
75
?
=
5
1
—
o
.
Coll
0
Q
Note
/
*
*
in
floor
non
—
2
T
\
'
\
N
L
With
circuit
breaker
on
rails
of
ceil
*
attach
racsking
handle
2
*
If
circuit
breaker
is
in
either
test
or
operating
position
,
depress
,
pedal
(
14
,
Fig
,
1
)
and
rack
,
Rackingfrom
other
positions
does
not
require
depressing
of
the
pedal
.
in
accordance
with
above
diagram
.
TRANSFER
TRUCK
For
outdoor
non
-
walk
*
in
5
and
ISkV
switchgear
.
5
k
V
2251
D
4689
6
M
High
Base
1
SkV
2251
P
4690
1314
”
High
Base
SkV
22510
4691
’
.
iSkV
2251
D
4692
6
n
HANDLING
DOLLY
DWG
*
NO
.
2251
C
4842
(
Standard
)
HANDLING
DOLLY
1
.
Position
wheel
below
circuit breaker
racking
block with
.
dolly
handle
up
.
2
.
Lower
handle
to
approximate
position
as
shown
.
3
.
Circuit
breaker
could
now
be
pushed
in
any
direction
by
turning
handle
.
ENGAGEMENT
PIN
.
CIRCUIT
BREAKER
1
-
m
~
\
L
FRONT
WHEEL
“
A
"
5
kV
ARC
CHUTE
LIFTING
YOKE
,
DWG
*
NO
.
1652
B
5
S
9
T
15
kV
ARC
CHUTE
LIFTING
YOKE
,
DWG
*
NO
.
1581
B
5597
x
O
®
^
ARC
CHUTE
LIFTING
YOKE
®
O
z
1
LIFTING
POINT
5
OR
ISkV
ARC
CHUTE
(
Standard
)
1
.
Attach
arc
chute
lifting
yoke
and
tighten
clamping
screws
securely
.
2
.
Lift
by
means
of
lifting
hook
or
sling
at
point
‘
W
1
;
arc
chute
wifi
swing
at
proper
angle
for
removing
or
assembling
on
to
circuit
breaker
,
V
\
.
Vl
-
i
1
FRONT
O
REAR
»
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.
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-
.
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. .
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.
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.
Ar
'
• •
•
.
>
*
•
{
.
• •
10
-
—
W
*
s
• •
Courtesy of NationalSwitchgear.com

•
/
>
TEST
JUMPER
,
DWG
.
NO
.
2251
C
4509
(
Optional
)
?
/
TN
5
kV
MAINTENANCE
CLOSE
HANDLE
%
DWG
.
NO
.
1551
B
5628
f
(
Standard
)
1
.
Attach
handle
to
main
shaft
as
shown
.
2
.
Rotate
downwards
until
contacts
touch
and
inspect
contact
sequence
.
sO
v
\
y
ji
CIRCUIT
BREAKER
TERMINAL
.
MAIN
SHAFT
CELL
TERMINAL
1
.
With
circuit
breaker
near
the
cell
,
insert
one
end
of
the
-
jumper
to
the
circuit
breaker
secondary
disconnect
terminal
.
2
,
Insert
the
other
end
to
the
cell
secondary
disconnect
•
terminal
.
The
circuit
breaker
could
now
be
.
tested
electrically
from
switch
on
instrument
door
.
e
ROTATE
TO
CLOSE
CONTACTS
)
REAR
OF
FRAME
TEST
CABINET
ASST
DWG
.
NO
.
2251
D
4340
(
Optional
)
16
kV
MAINTENANCE
CLOSE
,
DWG
.
NO
.
1551
C
5820
(
Standard
)
ACCELERATING
SPRING
1
.
With
the
circuit
breaker
removed
from
the
cell
and
moved
near
the
test
cabinet
,
insert
one
end
of
the
test
jumper
to
the
circuit
breaker
..
2
,
Connect
the
other
end
to
the
Test
Cabinet
secondary
.
disconnect
terminal
.
'
The
circuit
.
breaker
can
now
be
-
tested
electrically
from
the
test
cabinet
.
'
V
Y
/
9
/
1
TH
h
SWIPE
«
f
-
*
'
,
5
COMPRESS
:
LJ
V
1
.
Attach
handle
to
extension
of
accelerating
spring
as
shown
.
2
.
Compress
accelerating
spring
by
turning
handle
CCW
.
3
.
Rotate
contact
blades
by
hand
and
inspect
contact
,
sequence
.
4
.
Remove
maintenance
close
handle
before
operating
breaker
.
TABU
OF
SPARE
PARTS
FOR
BREAKER
SERIES
DST
-
2
APPENDIX
13
Typical
part
numbers
shown
.
Breaker
Serial
Numbers
must
be
given
when
ordering
replacement
parts
.
Type
of
Breaker
Quantity
for
1
Breaker
Pan
No
.
Description
No
.
Sketch
5
kV
1551
D
5464
250
MVA
5
kV
350
MVA
1551
D
6006
Arc
Chute
\
Jk
J
15
kV
1552
D
5484
500
MVA
!
5
kV
750
MVA
1553
D
5484
SkV
350
MVA
1
SkV
750
MVA
A
1565
D
5641
v
.
.
3
Fixed
Arcing
Contact
Pairs
5
kV
250
.
MVA
!
5
kV
500
1551
D
5641
Courtesy of NationalSwitchgear.com

TABLE
SPARE
PARTS
FOR
BREAKER
SERIES DST
-
Z
Quantity
-
for
1
Breaker
Type
of
Breaker
Sketch
-
No
*
Description
Part
No
.
SkV
1552
D
5641
250
MVA
&
.
350
MVA
Moving
Arcing
Contact
33
15
kV
750
MVA
1569
D
5641
15
kV
Moving
Arcing
Contact
4
-
1553
D
5641
3
500
MVA
O
o
O
o
O
15
kV
500
.
MVA
1200
A
15
kV
750
MVA
1200
A
1571
D
5641
1571
D
5641
'
24
"
48
A
SkV
250
and
350
MVA
1200
A
48
1555
D
5641
Main
Fixed
Contact
5
15
kV
500
&
750
MVA
2000
A
and
3000
A
1554
D
5641
48
SkV
250
MVA
.
2
Q
0
QA
5
kV
350
M
^
A
2000
A
&
3000
A
48
1570
D
5641
5
kV
250
MVA
2000
A
5
kV
350
MVA
1200
&
2000
A
'
15
kV
750
MVA
2000
A
1568
D
5641
Leading
Finger
for
Moving
Contact
6
6
5
kv
250
MVA
1200
A
5
kV
350
MVA
3000
A
I
5
kV
750
MVA
1200
&
3000
A
1556
D
5641
!
5
kV
1557
D
5641
.
500
MVA
Fixed
Arcing
Contact
Spring
.
7
6
5
kV
250
MVA
.
350
MVA
,
and
15
kV
750
MVA
1558
D
5641
I
•
5
kV
r
Rotating
Moving
Arcing
Contact
Spring
(
v
:
.
-
-
250
MVA
.
350
MVA
,
and
15
kV
7
S
0
MVA
8
1559
D
5641
j
20
Courtesy of NationalSwitchgear.com