GE CEY52B User manual

INSTRUCTIONS
GEK
-
454
%
6
MHO
DISTANCE
RELAY
TYPE
CEY
52
B
GENERAL
ELECTRIC
Courtesy of NationalSwitchgear.com

GEK
-
45495
CONTENTS
PAGE
DESCRIPTION
APPLICATION
RATINGS
OPERATING
PRINCIPLES
CHARACTERISTICS
BURDENS
CALCULATION
OF
SETTINGS
CONSTRUCTION
RECEIVING
,
HANDLING
AND
STORAGE
ACCEPTANCE
TESTS
INSTALLATION
PROCEDURE
INSPECTION
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
SERVICING
RENEWAL
PARTS
3
3
3
4
5
7
7
8
8
9
11
14
14
15
17
UD
CO
PO
O
CO
CXl
o
c
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GEK
-
45495
MHO
DISTANCE
RELAY
TYPE
CEY
52
B
DESCRIPTION
The
CEY
52
B
relay
is
a
three
-
phase
,
high
speed
,
single
-
zone
directional
mho
distance
relay
.
It
was
designed
specifically
for
use
with
the
CEX
20
A
or
CEX
20
B
reactance
type
relay
.
See
Table
I
.
The
CEY
52
B
relay
is
constructed
of
three
single
-
phase
units
mounted
in
one
L
2
-
D
case
with
provisions
for
single
phase
testing
.
The
internal
connections
for
the
relay
are
shown
in
Figure
10
,
while
outline
and
panel
drilling
dimensions
are
shown
in
Figure
16
.
Typical
external
connections
to
the
relay
are
shown
in
Figure
4
.
The
relay
is
not
intended
for
use
as
a
first
zone
function
,
thus
the
transient
overreach
characteristics
have
not
been
limited
in
this
respect
.
TABLE
I
BASIC
MINIMUM
REACH
TAPS
OF
CEY
52
B
SELECT
CEX
SHOWN
BELOW
CEX
20
A
CEX
20
B
0.5
-
1.0
-
1.5
1.0
-
2.0
-
3.0
APPLICATION
The
CEY
52
B
relay
is
a
three
-
phase
,
single
zone
mho
distance
relay
that
is
not
meant
to
be
used
by
itself
,
but rather
is
designed
to
be
used
with
a
CEX
20
A
or
CEX
20
B
reactance
type
relay
.
The
combination
of
relays
may
be
used
in
a
step
-
distance
scheme
to
provide
two
zones
of
protection
against
phase
faults
,
or
they
may
be
used
as
part
of
a
high
-
speed
pilot
-
relaying
scheme
in
addition
to
providing
step
-
distance
protection
.
Figure
4
illustrates
typical
external
connections
to
the
relay
when
it
is
used
in
a
step
-
distance
scheme
with
the
CEX
20
B
relay
.
When
applying
this
relay
for
the
protection
of
a
given
circuit
,
select
the
highest
basic
minimum
reach
tap
that
will
accommodate
the
desired
reach
setting
.
This
will
insure
that
the
relay
will
operate
at
the
highest
possible
level
of
torque
.
Since
the
memory
action
of
the
CEY
52
B
will
only
be
effective
for
several
cycles
after
the
inception
of
a
fault
,
the
relay
should
not
be
relied
on
to
provide
time
-
delay
protection
for
any
fault
that
provides
zero
voltage
at
the
relay
.
The
protection
should
be
supplemented
by
other
devices
to
detect
this
condition
if
protection
for
this
contingency
is
required
.
The
section
under
CALCULATION
OF
SETTINGS
provides
a
worked
example
for
determining
the
settings
of
the
CEY
52
B
in
a
typical
application
.
Once
the
settings
have
been
calculated
,
the
taps
are
set
as
described
in
the
section
entitled
TAPPED
AUTO
-
TRANSFORMERS
.
Under
no
conditions
,
should
the
restraint
taps
ever
be
set
less
than
25
percent
.
RATINGS
The
type
CEY
52
relay
covered
by
these
instructions
is
available
for
120
volts
,
5
amperes
,
60
or
50
cycles
rating
.
The
basic
minimum
reach
and
adjustment
ranges
of
the
mho
units
are
given
in
Table
II
.
It
will
be
noted
that
three
basic
minimum
reach
settings
are
listed
for
the
mho
units
.
Selection
of
the
desired
basic
minimum
reach
setting
for
each
unit
is
made
by
means
of
links
on
a
terminal
board
located
at
the
back
of
the
relay
(
see
Fig
.
2
)
.
The
position
of
the
two
sets
of
links
,
(
for
each
unit
)
,
each
identified
as
A
-
B
determine
the
basic
minimum
setting
of
the
mho
units
.
The
ohmic
reach
of
the
mho
units
can
be
adjusted
in
one
percent
steps
over
a
4
/
1
range
for
any
of
the
basic
minimum
reach
settings
listed
in
Table
II
by
means
of
autotransformer
tap
leads
on
the
tap
blocks
at
the
right
side
of
the
relay
.
These
insinuations
do
not
puxpont
to
coven
all
de
.
ta
.
llA
OK
.
vanlations
-
UT
.
equipment
non
to
pnovlde
ion
Should
evexy
possible
contingency
to
be
met
In
connection
with
installation
,
operation
on
mainte
,
nance
.
fiunthen
iyi
&
onmatlon
be
deAlncd
on
should
paxticulan
pnoblems
anise
which
-
one
not
cove
.
ned
sufficiently
&
o
*
i
the
ponchosen
*
s
punposes
,
the
molten
should
be
nepenned
to
the
Genenal
Tlectnic
Company
.
To
the
extent
nequined
the
pnoducts
deAcnibed
henein
meet
applicable
ANSI
,
IEEE
and
MEM
A
standards
;
but
no
such
assonance
is
given
with
nespe
.
ct
to
local
codes
and
ondlnances
because
they
vany
gncatly
.
3
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GEK
-
45495
TABLE
II
BASIC
MIN
REACH
(
0
-
N
OHMS
)
*
RANGE
(
0
-
N
OHMS
)
ANGLE
OF
MAX
TORQUE
ONE
SECOND
RATING
BASIC
REACH TAPS
60
°
*
*
60
°
**
60
°
*
*
0.5
0.5
-
2.0
1.0
-
4.0
1.5
-
6.0
150
1.0
0.5
-
1.0
-
1.5
150
1.5
150
60
°
* *
60
°
* *
60
°
* *
1
1
-
4
2
-
8
3
-
12
150
1
-
2
-
3
2
150
3
150
*
Adjustment
taps
are
set
using
middle
tap
at
the
factory
.
**
Maximum
torque
angle
can
be
adjusted
up
to
75
degrees
.
The
reach
of
the
mho units
will
increase
to
approximately
120
percent
of
its
reach
at
the
60
degree
setting
.
CONTACTS
The
contacts
of
the
CEY
52
relay
will
close and
carry
momentarily
30
amperes
direct
current
,
the
circuit
breaker
trip
circuit
must
be
opened
by
an
auxiliary
switch
contact
or
other
suitable
the
relay
contacts
have
no
interrupting
rating
.
However
,
means
since
TARGET
SEAL
-
IN
UNIT
The
target
seal
-
in
unit
used
in
the
CEY
52
relay
has
ratings
as
shown
in
Table
III
.
TABLE
III
TARGET
SEAL
-
IN
UNIT
0.2
AMP
TAP
0.6
AMP
TAP
2.0
AMP
TAP
Mininum
Operating
0.2
amp
0.6
amp
2.0
amp
Carry
Continuously
0.4
amp
1.5
amp
3.5
amp
Carry
30
amps
for
0.03
sec
.
0.5
sec
.
4.0
sec
.
Carry
10
amps
for
0.25
sec
.
4.0
sec
.
30.0
sec
.
D
-
C
Resistance
+
10
%
7.0
ohms
0.6
ohms
0.13
ohms
|
60
Cycle
Impedance
52
ohms
6.0
ohms
0.53
ohms
OPERATING
PRINCIPLES
The
mhc
units
of
the
CEY
52
relay
are
of
the
four
pole
induction
cylinder
construction
in
which
torque
reproduced
by
the
interaction
between
a
polarizing
flux
and
fluxes
proportional
to
the
restraining
or
operating
quantities
.
The
schematic
connections
of
the mho
unit
are
shown
"
>
n
Fig
.
phase
-
to
-
phase
voltage
,
produce
the
polarizing
percentage
of
the
same
phase
-
to
-
phase
voltage
,
torque
,
Dhase
-
to
- -
phe
.
se
voltage
,
interacts
with
the
polarizing
5
.
The
two
side
poles
,
energized
by
ux
.
The
flux
in
the
front
pole
,
which
is
energized
by
a
interacts
with
the
polarizing
flux
to
produce
restraint
The
flux
in
the
rear
pole
,
which is
energizes
by
the
two
line
currents
associated
with
the
same
lux
tc
produce
operating
torque
.
ei
she
torque
at
the
balance
point
of
the
unit
can
therefore
be
expressed
by
the
following
equation
:
0
=
El
COS
(
0
-
9
)
-
KE
2
Torque
where
:
E
-
phase
-
to
-
phase
voltage
(
E
^
)
I
=
delta
current
(
I
•
V
9
=
angle
of
maximum
torque
of
the unit
0
=
power
factor
angle
of
fault
impedance
K
=
design
constant
1
4
Courtesy of NationalSwitchgear.com

GEK
-
45495
To
prove
that the
equation
defines
a
mho
characteristic
divide
both
sides
by
E
2
and
transpose
,
equation
reduces
to
:
The
1
2
cos
(
0
-
9
)
=
K
or
:
Y
cos
(
0
-
9
)
=
K
Thus
,
the unit
will
pick
up
at
a
constant
component
of
admittance
at
a
fixed
angle
depending
on
the
angle
of
maximum
torque
.
Hence
,
the
name
mho
unit
.
CHARACTERISTICS
MHO
UNIT
1
.
Impedance
Characteristic
The
impedance
characteristic
of
a
mho
unit is
shown
in
Fig
.
6
for
the
one
ohm basic
minimum
reach
setting
at
a
maximum
torque
angle
of
60
degrees
.
This
circle
can
be
expanded
by
means
of
the
mho
taps
on
the
autotransformer
tap
block
providing
a
range
of
up
to
4
/
1
,
or
by
changing
the
basic
minimum
reach
of
the
unit
by
means
of
the
links
on
the
rear
providing
a
total
range
of
up
to
12
/
1
.
The
circle
will
always
pass
through
the
origin
and
have
a
diameter
along
the
60
degree
impedance
line
equal
to
the
ohmic
reach
of
the
unit
as
expressed
by
the
following
:
(
100
)
Z
-
min
Ohmic
Reach
=
tap
setting
(
%
)
where
:
Zm
^
n
=
basic
min
.
phase
-
to
~
neutral
ohmic reach
of
the
unit
.
The
angle
of
maximum
torque
of
the
mho
unit
can
be
adjusted
up
to
75
degrees
(
see
SERVICING
)
with
resulting
increase
in
reach
to
approximately
120
percent
of
its
reach
at
60
degrees
for
the
same
tap
setting
.
This
is
shown
by
the
dotted
characteristic
in
Fig
.
6
.
Directional Action
The
mho
unit
is
carefully
adjusted
to
have
correct
directional
action
under
steady
-
state
,
low
voltage
and low
current
conditions
.
For
faults
in
the
non
-
tripping
direction
,
the
contacts
will
remain
open
at
zero
volts
between
0
and
60
amperes
.
For
faults
in
the
tripping
direction
,
the
unit
will
close its
con
-
tacts
between
the
current
limits
in
Table
IV
for
the
three basic
minimum
reach
settings
at
the
voltage
shown
.
This
adjustment
is
a
function
of
the
core
(
inner
stator
)
position
and
should
any
adjustment
be
necessary
see
SERVICING
.
2
.
TABLE
IV
CURRENT
RANGE
FOR
CORRECT
DIRECTIONAL
ACTION
BASIC
MIN
REACH
TAP
*
V
0
LTS
0.5
Q
1.0
a
1.5
a
2
a
3
a
2.0
volts
2.0
volts
2.0
volts
2.0
volts
2.0
volts
1 2
-
6 0
amps
6
-
6 0
amps
4.5
-
6 0
amps
3
-
6 0
amps
2
-
6 0
amps
*
The
unit
is
set at
the
factory
on
the
middle
tap
(
la
for
0.5
/
1
/
1.5
unit
and
2
a
for
1
/
2
/
3
ohm unit
)
for
correct
directional
action
over
the
indicated
current
range
.
A
variation
of
+
10
percent
can
be
expected
on
the values
listed
.
For
performance
during
transient
low
-
voltage
conditions
,
where the
voltage
was
normal
at
120
volts
prior
to
the
fault
,
refer
to
the
paragraph
below
on
memory
action
.
5
Courtesy of NationalSwitchgear.com

GEK
-
45495
Underreach
J
.
At
reduced
voltage
the
ohmic
value
at
which
the
mho
unit
will
operate
may
be
somewhat
lower
than
the
calculated
value
.
This
"
pullback
"
or
reduction
in
reach
is
shown
in
Fig
.
3
for
the
1
,
2
and
3
ohm
basic
minimum
reach
settings
.
The
unit
reach
in
percent
of
setting
is
plotted
against
the
three
-
phase
fault
cur
-
t
for
three
ohmic
reach
tap
settings
.
Note
that
the
fault
current
scale
changes
with
the
basic
minimum
reach
setting
.
The
mho
unit
will
operate
for
all
points
to
the
right
of
the
curve
.
The
steady
-
state
curves
of
rig
.
3
were
determined
by
tests
performed
with
no
voltage
supplied
to
the
relay
before
the
fault
was
applied
.
The
dynamic
curves
were
obtained
with
full
rated
voltage
of
120
volts
supplied
to
the
relay
before
ie
fault
was
applied
.
+
t
L
i
Memory
Action
4
.
The
dynamic
curves
of
Fig
.
3
illustrate
the
effect
of
memory
action
in
the
mho
unit
which
maintains
the
polarizing
flux
for
a
few
cycles
following
the
inception
of
the
fault
.
This
memory
action
is
particularly
effective
at
low
voltage
levels
where
it
enables
the
mho
unit
to
operate
for
low
fault
currents
.
This
can
be
most
forcefully
illustrated
for
a
zero
voltage
fault
by
referring
to
Fig
.
3
.
A
zero
voltage
fault
must
be
right
at
the
relay
bus
and
therefore
,
to
protect
for
this
fault
,
it
is
imperative
that
the
relay
reach
zero
percent
of
its
setting
.
Fig
.
3
shows
that
the
mho
unit
,
under
static
conditions
,
will
not
see
a
fault
at
zero
percent
of
the
relay
setting
regardless
of
the
tap
setting
.
However
,
under
dynamic
conditions
when
the
memory
action
is
effective
,
Fig
.
3
shows
that
mho
unit
with
a
three
-
ohm
basic
minimum
reach
and
100
percent
tap
setting
will
operate
if
is
greater
than
1.6
amperes
.
The
memory
action
will
close
the
contact
for
only
a
short
period
of
time
and
therefore
,
memory
action
cannot
be
relied
on
if
the
tripping
is
delayed
.
When
the
relay
is
used
,
as
a
second
zone
relay
and
tripping
is
delayed
by
the
zone
2
setting
of
the
type
RPM
relay
,
the
static
characteristic
should
be
used
.
For
this
application
to
operate
for
nearby
faults
and
there
will
be
sufficient
voltage
to
give
tripping
without
depending
on
memory
action
.
Operating
Time
5
.
The
operating
time
of
the
mho
unit
is
determined
by
a
number
of
factors
such
as
the
basic
minimum
reach
setting
of
the
unit
,
fault
current
magnitude
,
ratio
of
fault
impedance
to
relay
reach
,
and
magnitude
of
relay
voltage
prior
to
the
fault
.
The
curves
in
Fig
.
8
are
for
the
condition
of
rated
volts
prior
to
the
fault
.
Time
curves
are
given
for
four
ratios
of
fault
impedance
to
relay
reach
setting
.
In
all
cases
,
the
mho
taps
were
in
the
100
percent
position
and
the
angle
of
maximum
torque
was
set
at
60
degrees
lag
.
TAPPED
AUT
0
-
TRANS
0
FRMERS
(
See
Fig
.
7
)
The
ohmic
reach
of
the
mho
units
may
be
adjusted
by
means
of
taps
on
the
two
auto
-
transformers
.
Each
auto
-
transformer
has
two
windings
.
One
winding
is
tapped
in
10
percent
steps
from
15
percent
to
95
percent
.
The
other
winding
is
tapped
at
0
percent
,
1
percent
,
3
percent
and
5
percent
.
The
desired
tap
setting
is
made
by
the
proper
location
of
the
leads
marked
No
.
1
and
the
jumper
con
-
necting
the
two
windings
of
the
auto
-
transformer
.
Note
that
the
0
-
5
percent
winding
may
be
added
or
subtracted
from
the
15
-
95
percent
winding
.
The
tap
setting
required
to
protect
a
zone
Z
ohms
long
,
where
Z
is
positive
phase
sequence
phase
-
to
-
neutral
impedance
expressed
in
secondary
terms
,
is
determined
by
the
following
equation
:
(
100
)
(
Min
.
Ohms
Setting
)
Cos
(
0
-
9
)
Tap
Setting
=
Z
where
:
0
=
Power
factor
angle
of
fault
impedance
9
=
Angle
of
maximum
torque
of
the
unit
Example
1
:
TAP
SETTING
DESIRED
=
91
Set
one
end
of
jumper
lead
to
95
percent
.
Set
the
other
end
to
5
percent
.
Set
No
.
1
to
1
percent
.
(
Note
the
4
percent
setting
of
the
0
-
5
percent
winding
subtracts
from
the
95
percent
setting
)
Example
2
:
TAP
SETTING
DESIRED
=
89
Set
No
.
1
to
5
percent
.
Set
the
other
end
to
1
percent
.
Set
one
end
of
jumper
lead
to
85
percent
.
(
Note
the
4
percent
setting
of
the
0
-
5
percent
winding
adds
to
the
85
percent
setting
.
)
6
Courtesy of NationalSwitchgear.com

GEK
-
45495
BURDENS
CURRENT
CIRCUITS
The maximum
current
burden
imposed
on
each
current
transformer
at
5
amperes
is
listed
in
Table
v
.
TABLE
V
T
R
P
.
F
.
WATTS
AMPS CYCLES
X
VA
.
043
5
60
.
026
0.86
1
.
08 1.25
This
data
is
for
the
3.0
ohm
basic
reach
tap
setting
for
60
cycles
,
or
50
cycles
will
be
lower
.
The
burden
for
the
lower
tap
setting
POTENTIAL
CIRCUITS
The maximum
potential
burden
imposed
on
each
potential
transformer
at
120
volts
is
listed
in
Table
VI
.
TABLE
VI
FREQ
CIRCUIT
R
WATTS
VARS
X
P
.
F
.
VA
Polarizing
Restraint
Polarizing
Restraint
1534
10
1.00
9.4
0.1
60
9.4
1060
1580
0.55
4.2
60
6.3
7.6
135
50
2200 1.00
6.5
0.4
6.5
1160
1600
50
0.73
4.3
5.9
7.2
The
potential
burden
of
the
mho
unit
is
maximum when
the
restraint
tap
is
set
for
100
percent
.
The
restraint
circuit
burden and
hence the
total
relay
burden
will
decrease
when
the restraint
tap
setting
is
less
than
100
percent
.
The
potential
burden
at
tap
settings
less
than
100
percent
,
can
be
calculated
from
the
following
formula
.
2
Tap
Setting
VA
=
(
a
+
jb
)
+
(
c
+
jd
)
TOO
The
terms
(
a
+
jb
)
(
c
+
jd
)
,
etc
.
represent
the
burdens
of
the
mho
unit
potential
circuit
expressed
in
watts
and
vars
with
their
taps
on
100
percent
.
The values
of
these
terms
are
given
in
Table
VI
.
(
a
+
jb
)
=
(
watts
+
j
vars
)
for
restraint
circuit and
(
c
+
jd
)
=
(
watts
+
j
vars
)
for
polarizing
circuit
.
CALCULATION
OF
SETTINGS
Consider
a
230
kV
transmission
line
50
miles
long
having
a
phase
-
to
-
neutral
impedance
of
:
0.14
+
j
0.80
ohms
per
mile
,
Z
„
.
=
50
(
0.14
+
j
0.80
)
=
7
+
j
40
ohm total
pri
PT
Ratio
=
230
,
000
/
115
=
2000
/
1
CT
Ratio
=
600
/
5
=
120
/
1
CT
Ratio
Z
=
Z
.
sec
pri
PT
Ratio
120
=
(
7.0
+
j
40.0
)
Z
=
0.42
+
j
2.4
ohms
sec
2000
=
2.43
/
80.5
°
ohms
Z
sec
7
Courtesy of NationalSwitchgear.com

GEK
-
45495
Assume
that
the
CEY
52
is
to
be
used
in
conjunction
with
a
CEX
20
A
to
provide
second
zone
protection
and
it
is
aesired
,
after
considering
the
effects
of
infeed
,
to
set
the
relay
to
reach
3.64
/
80.5
°
secondary
ohms
.
For
this
application
the
three
-
ohm
basic
minimum
reach
setting
should
be
used
.
The
ohmic
reach
equation
,
given
the
section
under
CHARACTERISTICS
-
TAPPED
AUTO
-
TRANSFORMERS
is
used
.
(
100
)
(
Min
.
ohms
)
Cos
(
0
-
9
)
Percent
Tap
Setting
=
Z
Minimum
Ohms
=
3.0
at
60
deg
.
,
3.6
at
75
deg
.
=
3.64
Z
=
Z
sec
9
=
750
0
=
80.5
°
(
100
)
(
3.6
)
Cos
(
80.5
-
75
)
Percent
Tap
Setting
=
3.64
Percent
Tap
Setting
=
98
%
CONSTRUCTION
The
type
CEY
52
relays
are
assembled
in
a
deep
large
size
,
double
-
end
(
L
2
D
)
drawout
case
having
studs
at
both
ends
in
the
rear
for
external
connections
.
The
electrical
connections
between
the
relay
units
and
the
case
studs
are
made
through
stationary
molded
inner
and
outer
blocks
between
which
nests
a
removable
connection
plug
which
completes
the
circuits
.
The
outer
blocks
attached
to
the
case
have
the
studs
for
the
external
connections
and
the
inner
blocks
have
the
terminals
for
the
internal
connections
.
Every
circuit
in
the
drawout
case
has
an
auxiliary
brush
,
as
shown
in
Fig
.
9
,
to
provide
adequate
overlap
when
the
connecting
plug
is
withdrawn
or
inserted
.
Some
circuits
are
equipped
with
shorting
bars
(
see
internal
connections
in
Fig
.
10
)
and
on
those
circuits
,
it
is
especially
important
that
the
auxiliary
brush
make
contact
as
indicated
in
Fig
.
9
with
adequate
pressure
to
prevent
the
opening
of
important
inter
-
locking
circuits
.
The
relay
mechanism
is
mounted
in
a
steel
framework
called
the
cradle
and
is
a
complete
unit
with
all
leads
terminated
at
the
inner
block
.
This
cradle
is
held
firmly
in
the
case
with
a
latch
at
both
top
and
bottom
and
by
a
guide
pin
at
the
back
of
the
case
.
The
connecting
plug
,
besides
making
the
electrical
connections
between
the
respective
blocks
of
the
cradle
and
case
,
also
locks
the
latch
in
place
.
The
cover
,
which
is
drawn
to
the
case
by
thumbscrews
,
holds
the
connecting
plugs
in
place
.
The
target
reset
mechanism
is
a
part
of
the
cover
assembly
.
The
relay
case
is
suitable
for
either
semi
-
flush
or
surface
mounting
on
all
panels
up
to
two
inches
thick
and
appropriate
hardware
is
available
.
However
,
panel
thickness
must
be
indicated
on
the
relay
order
to
insure
that
proper
hardware
will
be
included
.
A
separate
testing
plug
can
be
inserted
in
place
of
the
connecting
plug
to
test
the
relay
in
place
on
the
panel
either
from
its
own
source
of
current
and
voltage
,
or
from
other
sources
;
or
the
relay
can
be
dv
-
awn
out
and
replaced
by
another
which
has
been
tested
in
the
laboratory
.
Figs
.
1
and
2
show
the
relay
removed
from
its
drawout
case
with
all
major
components
identified
.
Symbols
used
to
identify
circuit
components
are
the
same
as
those
which
appear
on
the
internal
connection
diagram
in
Fig
.
10
.
The
relav
includes
three
similar
mho
subassembly
elements
mounted
on
the
front
of
the
cradle
and
a
plate
with
transformers
and
tap
blocks
mounted
on
the
back
of
the
cradle
.
See
Figs
.
1
and
2
.
The
mho
sub
-
assembly
includes
the
four
-
pole
uni
!
:
and
the
associated
circuit
components
.
Rheostats
(
R
21
,
,
R
23
;
used
in
setting
the
angle
of
maximum
torque
and
rheostats
Rll
,
R
12
,
R
13
used
in
setting
the
basic
minimum
reach
can
be
adjusted
from
the
front
of
the
relay
.
The
tap
blocks
for
changing
the
basic
minimum
reach
of
the
units
are
mounted
on
the
back
,
must
be
removed
from
its
case
to
make
the
settings
.
The
relav
RECEIVING
,
HANDLING
AND
STORAGE
These
relays
,
when
not
included
as
a
part
of
a
control
panel
,
will
be
shipped
in
cartons
designed
to
protect
them
against
damage
.
Immediately
upon
receipt
of
a
relay
,
examine
it
for
any
damage
sustained
in
8
Courtesy of NationalSwitchgear.com

GEK
-
45495
If
injury
or
damage
resulting
from
rough
handling
is
evident
,
file
a
damage
claim
at
once
with
the
transit
.
transportation
company
and
promptly
notify
the
nearest
General
Electric
Apparatus
Sales
Office
.
Reasonable
care
should be
exercised
in
unpacking
the
relay
in
order
that
none
of
the
parts
are
injured
or
the
adjustments
disturbed
.
If
the
relays
are
not to
be
installed
immediately
,
they
should
be
stored
in
their
original
cartons
in
a
place
that
is
free
from
moisture
,
dust
and
metallic
chips
.
Foreign
matter
collected
on
the
outside
of
the
case
may
find
its
way
"
'
nside
when
the
cover
is
removed
and
cause
trouble
in
the
operation
of
the
relay
.
ACCEPTANCE TESTS
Immediately
upon
receipt
of
the
relay
,
an
inspection
and
acceptance
tests
should be made
to
insure
that
no
damage
has
been
sustained
in
shipment
and
that
the
relay
calibrations
have
not
been
disturbed
.
If
the
examination
or
test
indicates
that
readjustment
is
necessary
,
refer
to
the
section
on
SERVICING
.
VISUAL
INSPECTION
Check
the
nameplate
stamping
to
insure
that
the
model
number
and
rating
of
the
relay
agree
with
the
requisition
.
Remove
the
relay
from
its
case
and check that there
are no
broken
or
cracked molded
parts
or
other
signs
of
physical
damage
,
and
that all
screws are
tight
.
MECHANICAL
INSPECTION
It
is
recommended
that
the mechanical
adjustments
in
Table
VIII
be checked
.
1
.
2
.
There
should be
no
noticeable
friction
in
the
rotating
structure
of
the
units
.
3
.
Make
sure
control
springs
are
not
deformed
and
spring
convolutions
do
not
touch
each other
.
4
.
With
the
relay
well leveled
in
its
upright
position
the
contacts
of
all
three units
must
be
open
.
The
moving
contacts
of
the
units should
rest
against
the
backstop
.
The
armature
and
contacts
of
the seal
-
in
unit
should
move
freely
when
operated
by
hand
.
There
should
be
at
least
1
/
32
inch
wipe
on
the
seal
-
in
contacts
.
Check
the
location
of
the
contact
brushes
on
the
cradle
and
case
blocks
against
the
internal
connection
diagram
for
the
relay
.
5
.
6
.
TABLE
VIII
CHECK
POINTS
MHO
UNITS
Rotating
Shaft
End
Play
Contact
Gap
Contact
Wipe
.
010
-
.
015
inch
.
155
inch
.
005
inch
.
145
.
003
ELECTRICAL
CHECKS
-
MHO
UNITS
«
7
1
j
t
tests
must
be
made
with
relay
in
case
.
Before
any
electrical checks
are
made
on
the
mho units
the
y
should
be
connected
as
shown
in
Fig
.
11
and be
allowed
to
warm
up
for
approximately
15
minutes
with
the
circuit
alone
energized
at
rated
voltage
and
the
restraint
taps
set
at
100
percent
.
The
units
or
to
factory
adjustment
and
if
rechecked
when cold
will
tend
to
underreach
by
3
or
4
per
-
Accurate
'
y
calibrated
meters
are
,
of
course
,
essential
.
desirable
to
check
the
factory
setting
and
calibration
by
means
of
the
test
described
in
the
fol
-
ding
sections
.
The
mho
units
were
carefully
adjusted
at
the
factory
and
it
is
not
advisable
to
disturb
r
,
e
$
e
settings
unless the
following
checks
indicate
conclusively
that
the
settings
have
been
disturbed
.
If
eadjustments
are
necessary
refer
to
the
section
on
SERVICING
for
the
recommended
procedures
.
Test
connections
for
checking
correct
mho
unit
operation
,
a
)
Control
Spring
Adjustment
Be
sure
that the
relay
is
level
in
its
upright
position
.
Leave
the
relay
connected
as
shown
in
Fig
.
11
and
leave
the
restraint
taps
in
the
100
percent
position
.
la
.
ocential
-
f
i
\
9
Courtesy of NationalSwitchgear.com

GEK
-
45495
Use
the
following
procedure
in
checking
each
unit
.
With
the
current
set
at
five
amperes
and
the
voltage
across
relay
voltage
studs
at
120
volts
,
set
the
phase
shifter
so
that
the
phase
-
angle
meter
reads
the
value
shown
in
Table
IX
for
the
unit
being
tested
,
that
is
so
current
lags
voltage
by
an
angle
equal
to
the
angle
of
maximum
torque
of
the
unit
.
Now
reduce
the
voltage
to
the
low
test
voltage
and
reduce
the
cur
-
rent
to
about
two
amperes
.
Gradually
increase
the
current
until
the
contacts
of
the
unit
just
close
.
This
should
occur
between
the
currents
listed
in
Table
IX
.
(
b
)
Clutch
Adjustment
The
mho
units
include
a
high
-
set
clutch
between
the
cup
and
shaft
assembly
and
the
moving
contact
tc
prevent
damage
during
heavy
fault
conditions
.
These
clutches
have
been
set
at
the
factory
to
slip
at
approximately
40
-
60
grams
applied
tangentially
at
the
moving
contact
.
This
can
best
be
checked
in
the
field
in
terms
of
volt
-
amperes
by
the
following
method
.
Use
the
connections
of
Fig
.
11
and
set
the
phase
shifter
so
that
the
phase
-
angle
meter
reads
the
value
in
Table
X
for
the
unit
to
be
checked
,
at
120
volts
and
5
amperes
.
Disconnect
the
No
.
1
restraint
tap
leads
from
the
tap
block
and
set
the
mho
units
for
maximum
ohm
basic
minimum
reach
.
With
the
voltage
across
relay
studs
set
at
120
volt
increase
the
current
until
the
clutch
just
slips
.
This
should
occur
between
26
and
45
amperes
for
the
3
nunit
or
just
above
52
amperes
for
1.512
unit
.
(
c
)
Ohmic
Reach
With
the
relay
still
connected
as
shown
in
Fig
.
11
and
the
restraint
tap
leads
in
the
100
percent
position
,
make
connections
shown
in
Table
X
and
set
the
phase
shifter
so
that
the
phase
-
angle
meter
reads
the
angle
shown
in
the
table
for
the
unit
to
be
checked
.
Now
reduce
the
voltage
to
the
value
shown
in
Table
X
and
increase
the
current
gradually
until
the
normally
open
contacts
of
the
unit
just
close
.
This
should
occur
within
the
limits
shown
.
Note
that
the
ta
screws
on
the
transactor
tap
blocks
are
set
to
the
position
which
gives
the
basic
minimum
reach
shown
in
the
table
.
Note
that
for
the
test
conditions
,
the
mho
units
see
a
phase
-
to
-
phase
fault
of
twice
the
basic
minimum
reach
.
The
relays
are
normally
shipped
from
the
factory
with
the
basic
minimum
reach
adjustment
taps
of
the
units
in
the
intermediate
setting
,
that
is
the
2
ohm
-
tap
.
If
the
units
are
set
on
either
of
the
remain
-
ing
basic
minimum
reach
taps
,
2
or
3
ohms
,
the
basic
reach
of
the
units
will
be
within
+
4
percent
of
the
nameplate
marking
.
(
d
)
Angle
of
Maximum
Torque
For
checking
the
angle
of
maximum
torque
the
connections
of
Fig
.
11
will
be
used
with
the
restraint
tap
leads
set
at
100
percent
position
,
and
with
the
voltage
set
at
the
value
shown
in
Table
XI
for
the
unit
to
be
checked
.
The
minimum
reach
taps
should
be
set
to
the
2
-
ohm
position
.
In
checking
the
mho
units
the
following
procedure
should
be
used
.
First
set
the
phase
shifter
so
tnat
the
phase
-
angle
meter
reads
330
degrees
.
Note
that
while
the
phase
angle
is
being
set
,
the
current
should
be
at
5
amperes
and
the
voltage
at
120
volts
.
Now
set
the
voltage
at
the
value
shown
in
Table
XI
;
increase
the
current
slowly
until
the
mho
unit
picks
up
.
The
pickup
current
should
be
within
the
limits
shown
in
the
table
.
Now
reset
the
phase
angle
at
270
degrees
and
again
check
the
current
required
to
pick
up
the
mho
unit
.
This
current
should
fall
within
the
same
limits
as
for
the
330
degree
check
.
Connect
the
relay
as
follows
:
CONNECT
LEAD
TO
RELAY
STUDS
AS
FOLLOWS
(
SEE
FIG
.
11
)
JUMPER
STUDS
UNIT
UNIT
LOCATION
LEAD
A
LEAD
B
LEAD
C
LEAD
D
*
1
-
2
14
-
15
13
-
16
-
17
TOP
6
-
8
-
10
5
7
13
-
16
-
17
18
-
19
-
20
MIDDLE
*
2
-
3
7
9
6
-
8
-
10
18
-
19
-
20
BOTTOM
*
3
-
1
14
-
15
9
5
6
-
8
-
10
10
Courtesy of NationalSwitchgear.com