Westinghouse De-ion 50-DH-350 User manual

I
.
B
.
32
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251
-
4
OPERATION
RECEIVING
MAINTENANCE
INSTRUCTIONS
AIR
CIRCUIT
BREAKER
Type
50
DH
350
Horizontal
Drawout
Indoor
and
Ontdoor
Service
INTERRUPTING
RATINGS
—
AMPERES
VOLTAGE
RATINGS
3
-
PHASE
INTER
-
RUPTING
RATING
AMPERES
CONTIN
-
A
1
R
CIRCUIT
BREAKER
Min
.
KV
.
for
Rated
uous
Max
.
Design
At
60
CYCLES
TYPE
MVA
.
Rated
Rated
Max
.
Amperes
INT
.
KV
.
KV
.
Voltage
MVA
.
4.76
4.0
50
,
000
50
,
000
50
-
DH
-
350
50
-
DH
-
350
350
4.16
1200
48
,
000
48
,
000
4.0
4.16
4.76
3000
350
WESTING
HOUSE
ELECTRIC
CORPORATION
SWITCHGEAR
APPARATUS
DEPARTMENTS
EAST
PITTSBURGH
,
PA
.
NOVEMBER
,
1958
EAST
PITTSBURGH
PLANT
NEW
INFORMATION
Printed
in
U
.
S
.
A
.
Courtesy of NationalSwitchgear.com

1
TABLE
OF
CONTENTS
DESCRIPTION
Part
One
Pages
5
-
6
Description
5
RECEIVING
,
HANDLING
AND
STORING
Part
Two
Page
7
Receiving
Handling
.
Storing
. . .
7
7
7
OPERATION
Part
Three
Pages
8
to
18
Operation
Mechanism
Mechanism
Panel
Shunt
Trip
Magnet
Cut
-
Off
Switch
Contact
Position
Indicator
Interlock Position
Indicator
Operation
Counter
Auxiliary
Switch
Latch
Check Switch
Undervoltage
Trip
Attachment
Three
-
Coil
Trip
Attachment
...
Contacts
Arc
Chutes
Levering
-
In
Device
Test
Position
Operating
Position
Interlock
Secondary
Contacts
Puffer
Assembly
Arc
Chute
Lifter
8
8
10
10
10
10
10
10
11
11
11
11
11
11
15
15
15
16
16
17
18
INSTALLATION
Pari
FOOT
Pages
19
-
20
Installation
19
i
ADJUSTMENT
Part
Five
Page
21
Mechanism
Tripping
Latch
Cut
-
Off
Switch
Latch
Check
Switch
Contacts
21
21
21
21
21
2
Courtesy of NationalSwitchgear.com

1
I
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B
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32
-
251
-
4
50
-
DH
-
350
AIR
CIRCUIT
BREAKER
TABLE
OF
CONTENTS
—
Continued
MAINTENANCE
Pages
22
-
27
Part
Six
22
Maintenance
Contacts
Moving
Contact
Assembly
Stationary
Main
Contact
Stationary
Arcing
Contacts
Arc
Chutes
Broken
or
Cracked
Ceramic
Parts
Erosion
of
Ceramics
Dirt
in
Arc
Chute
Cleaning
Arc
Shields
Operating
Mechanism
Lubrication
Clearances
Puffer
Puffer
Nozzle
Organic
Insulation
22
22
25
25
25
.
25
25
<
25
26
26
1
26
26
27
27
27
PARTS
IDENTIFICATION
Page
28
Part
Seven
28
Parts
Identification
Renewal
Parts
28
i
4
4
I
3
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LIST
OF
ILLUSTRATIONS
Figure
Page
1
Type
50
-
DH
-
350
,
3000
Amp
.
,
Breaker
Completely
Assembled
2
Type
50
-
DH
-
350
,
3000
Amp
.
Breaker
with
Barrier
Removed
.
.
3
Breaker
with
Barrier
Removed
and
Arc
Chutes
Tilted
Back
for
Inspection
.
7
4
Solenoid
Operating
Mechanism
5
Mechanism
Panel
6
Moving
Contact
Assembly
7
Stationary
Contact
Assembly
8
Arc
Chute
Arrangement
9
Partially
Assembled
Arc
Chute
10
View
of
Lower
Part
of
Breaker
from
Rear
11
Rear
View
of
3000
Amp
.
,
50
-
DH
-
350
Breaker
12
Rear
View
of
1200
Amp
.
,
50
-
DH
-
350
Breaker
13
Front
View
Showing
Socket
for
Operating
Secondary
Contacts
14
Method
of
Operating
Secondary
Contacts
15
Pole
Unit
Assembly
16
Moving
Contact
Assembly
17
Stationary
Contact
Assembly
18
Puffer
Assembly
5
6
9
I
10
12
13
14
15
16
17
17
17
18
18
23
24
27
4
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I
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B
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32
-
251
-
4
50
-
DH
-
350
AIR
CIRCUIT
BREAKER
PART
ONE
DESCRIPTION
Minimum
voltage
for
rated
interrupting
capacity
Interrupting
current
at
rated
voltage
Maximum
interrupting
current
....
50
,
000
Amps
Figure
1
shows
a
50
-
DH
-
350
breaker
completely
assembled
.
Figure
2
shows
the
same
breaker
with
the
main
barrier
removed
.
This
shows
the
arrange
-
ment
of
the
center
-
coil
arc
chutes
,
separating
con
-
tacts
,
primary
disconnecting
contacts
,
insulated
operating
rods
,
and
the
solenoid
operating
mech
-
anism
.
These
components
are
supported
on
a
welded
steel
frame
which
is
mounted
on
flanged
wheels
for
rolling
into
the
metal
-
clad
cell
.
In
the
lower
part
of
the
frame
is
located
the
levering
-
in
device
for
moving
the
breaker
into
final
contact
engagement
.
It
is
interlocked
with
the
mecha
-
nism
to
prevent
inserting
or
withdrawing
the
breaker
with
the
contacts
closed
.
It
also
prevents
closing
the
contacts
unless
the
breaker
is
completely
in
or
completely
out
of
the
cell
.
Also
located
in
the
lower
part
of
the
frame
are
the
secondary
contacts
,
for
automatically
disconnecting
the
control
wiring
when
the
breaker
is
in
the
withdrawn
position
,
the
auxiliary
switch
,
shunt
trip
,
cut
-
off
switch
,
latch
checking
switch
,
operation
counter
,
breaker
con
-
tacts
position
indicator
,
and
levering
-
in
device
position
indicator
.
The
arc
chutes
on
this
breaker
are
of
the
center
-
coil
design
.
With
this
type
of
construction
,
the
magnetic
circuit
is
H
-
shaped
with
the
cross
member
of
the
H
passing
through
the
center
of
the
arc
chute
.
The
blowout
coils
are
wound
around
the
cross
member
of
the
H
and
lie
in
the
center
of
the
arc
chute
.
With
this
arrangement
,
the
magnet
core
passing
through
the
center
of
the
arc
chute
,
it
is
impossible
to
remove
the
arc
chute
from
the
magnet
.
To
pro
-
vide
easy
accessibility
for
contact
maintenance
and
inspection
,
the
arc
chutes
are
hinged
at
the
rear
,
and
a
simple
tilting
device
is
provided
.
Figure
3
shows
the
breaker
with
the
arc
chutes
tilted
back
.
The
levering
-
in
device
is
used
to
supply
the
me
-
chanical
advantage
for
tilting
the
arc
chutes
.
A
one
piece
barrier
assembly
is
placed
on
the
breaker
before
it
is
rolled
into
the
cell
.
The
front
sheet
is
of
1
/
g
-
inch
aluminum
to
form
a
grounded
barrier
between
personnel
and
live
parts
when
the
unit
is
in
the
cell
.
4.0
KV
48
,
000
Amps
<
)
FIG
.
1
.
Type
59
-
DH
-
350
,
3000
Amp
.
,
Breaker
Completely
Assembled
The
type
50
-
DH
-
350
air
circuit
breaker
is
a
three
-
pole
,
electrically
operated
,
horizontal
draw
-
out
unit
for
metal
-
clad
switchgear
.
The
rating
of
the
breaker
is
as
follows
:
350
MVA
Interrupting
rating
Continuous
current
at
60
cycles
Rated
voltage
Maximum
design
voltage
1200
&
3000
Amps
4.16
KV
4.76
KV
5
Courtesy of NationalSwitchgear.com