GE CEX57D User manual

GEK
-
49778
D
INSTRUCTIONS
ANGLE
-
IMPEDANCE
RELAY
TYPES
:
CEX
57
D
CEX
57
E
CEX
57
F
GE
Power
Management
205
Great
Valley
Parkway
Malvern
,
PA
19355
Telephone
:
(
610
)
251
-
7000
www
.
ge
.
com
/
edc
/
pm
Courtesy of NationalSwitchgear.com

GEK
-
49778
CONTENTS
PAGE
DESCRIPTION
APPLICATION
CEX
57
D
AND
CEX
57
F
CEX
57
E
RATINGS
CONTACTS
OPERATING
PRINCIPLES
CHARACTERISTICS
ANGLE
-
IMPEDANCE
UNIT
UPPER
UNIT
LOWER
UNIT
TAPPED
AUTOTRANSFORMER
BURDENS
CURRENT
CIRCUIT
POTENTIAL
CIRCUIT
CALCULATION
OF
SETTINGS
rflNCTRlirTTON
RECEIVING
,
HANDLING
AND
STORAGE
ACCEPTANCE
TESTS
VISUAL
INSPECTION
MECHANICAL
INSPECTION
ELECTRICAL
TESTS
ELECTRICAL
TESTS
-
AUXILIARY
UNIT
(
CEX
57
F
ONLY
)
INSTALLATION
PROCEDURE
LOCATION
MOUNTING
CONNECTIONS
VISUAL
INSPECTION
MECHANICAL
INSPECTION
INSPECTION
ANGLE
-
IMPEDANCE
TESTS
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
CONTACT
CLEANING
SERVICING
CONTROL
SPRING
ADjuSTMENT
*
.
*
.
!
!
!
.
.
ANGLE
OF
MAXIMUM
TORQUE
ADJUSTMENT
BASIC
REACH
OHMS
CORE
ADJUSTMENT
RENEWAL
PARTS
3
3
3
4
4
4
4
6
6
6
7
7
8
8
8
9
10
11
12
12
12
12
OHM
UNIT
13
14
14
14
14
14
14
14
14
15
15
16
16
16
17
18
18
(
COVER
PHOTO
8042958
)
2
Courtesy of NationalSwitchgear.com

GEK
-
49778
ANGLE
-
IMPEDANCE
RELAY
TYPES
:
CEX
57
D
CEX
57
E
CEX
57
F
DESCRIPTION
Type
CEX
57
relays
are
high
speed
induction
cup
-
type
devices
with
ohm
unit
characteristics
that
can
be
set
parallel
to
the
impedance
of
a
transmission
line
.
The
relays
are
designed
for
use
with
other
protective
devices
in
blinder
applications
to
restrict
the
tripping
area
of
the
tripping
units
used
in
a
protective
relay
scheme
.
Or
,
they
may
be
used
in
applications
where
tripping
is
required
during
an
out
-
of
-
step
condition
.
instruction
book
.
These
applications
are
discussed
in
the
APPLICATION
section
of
this
Type
CEX
57
relays
each
contain
two
cup
-
type
units
,
and
they
are
mounted
in
an
M
2
size
case
.
The
CEX
57
F
relay
also
contains
an
auxiliary
telephone
-
type
unit
.
Internal
connections
for
the
relays
are
shown
in
Figures
9
,
10
and
11
;
typical
external
connections
are
shown
in
Figure
5
.
Outline
and
panel
drilling
dimensions
are
shown
in
Figure
14
.
APPLICATION
The
CEX
57
relays
were
designed
specifically
for
use
in
blinder
applications
,
or
in
applications
to
initiate
tripping
during
an
out
-
of
-
step
condition
.
Three
models
of
the
relay
are
available
:
CEX
57
D
,
CEX
57
E
and
CEX
57
F
.
Typical
applications
for
each
of
these
relays
are
as
follows
:
CEX
57
D
AND
CEX
57
F
The
CEX
57
D
and
CEX
57
F
relays
are
used
in
blinder
applications
to
restrict
the
area
of
the
tripping
functions
used
in
a
transmission
line
protective
relaying
scheme
(
see
Figure
4
)
.
Either
three
CEX
57
D
or
three
CEX
57
F
relays
are
required
.
Basically
,
tripping
will
be
permitted
only
when
the
fault
impedance
plots
within
the
reach
of
the
mho
tripping
function
AND
both
of
the
ohm
units
.
Since
the
right
hand
ohm
unit
will
operate
only
for
faults
to
the
left
of
it
,
both
units
can
operate
simultaneously
only
for
faults
that
plot
between
them
.
The
tripping
function
(
mho
)
will
provide
correct
directional
action
,
and
limit
the
reach
in
the
forward
direction
.
The
contacts
of
the
CEX
57
D
ohm
units
are
brought
out
separately
,
and
are
externally
connected
in
series
with
the
contacts
of
the
corresponding
mho
tripping
function
to
provide
supervision
(
see
Figure
5
C
)
.
The
contacts
of
the
CEX
57
F
relay
are
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
to
provide
for
every
possible
contingency
to
be
met
in
connection
with
installation
,
operation
or
maintenance
.
Should
further
information
be
desired
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for
the
matter
should
be
referred
to
the
General
Electric
Company
.
the
purchaser
'
s
purposes
.
To
the
extent
reguired
the
products
described
herein
meet
applicable
ANSI
,
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
IEEE
and
NEMA
standards
;
3
Courtesy of NationalSwitchgear.com

GEK
-
49778
internally
connected
in
series
,
and
are
used
to
operate
the
internal
mounted
auxiliary
telephone
relay
.
The
contacts
of
this
auxiliary
relay
are
then
used
to
supervise
the
corresponding
mho
tripping
function
(
see
Figure
5
B
)
.
CEX
57
E
The
Type
CEX
57
E
relay
was
designed
specifically
for
use
with
Type
GSY
or
NAA
relays
,
which
provide
the
additional
functions
required
to
implement
an
out
-
of
-
step
tripping
scheme
.
Only
one
CEX
57
E
relay
is
required
in
these
applications
.
The
CEX
-
NAA
combination
is
primarily
for
application
to
transmission
lines
,
combination
is
primarily
for
application
to
generators
.
Specific
details
on
the
operation
of
either
of
these
schemes
can
be
found
in
the
appropriate
NAA
or
GSY
relay
instruction
books
.
For
further
information
,
and
exact
model
numbers
of
these
relays
,
contact
the
nearest
General
Electric
District
Sales
Office
.
The
CEX
-
GSY
RATINGS
The
Type
CEX
57
relays
covered
by
these
instructions
are
rated
120
volts
,
five
amperes
,
for
either
50
or
60
hertz
.
They
have
three
basic
minimum
ohmic
reaches
that
are
set
by
a
double
set
of
taps
on
each
unit
.
The
taps
are
0.5
,
1.5
or
3.0
ohms
(
phase
-
to
-
nuetral
)
when
the
maximum
torque
angle
is
set
for
five
degrees
lead
(
current
leads
voltage
)
.
The
reach
of
the
unit
can
be
increased
from
minimum
ohms
(
100
percent
tap
)
to
ten
time
the
minimum
ohms
(
ten
percent
tap
)
by
means
of
taps
in
the
potential
circuit
.
The
relay
can
be
set
for
an
ohmic
reach
between
0.5
ohms
and
30
ohms
.
TABLE
I
TAP
RANGE
IN
RANGE
IN
AMPERES
ONE
SECOND
CURRENT
RATING
CONTINUOUS
CURRENT
RATING
USED
OHMS
0.5 0.5
-
5
8.2
-
40
100
amperes
100
amperes
5
amperes
1.5
1.5
-
15
5.0
-
40
5
amperes
3.0
3.0
-
30
3.5
-
40
100
amperes
5
amperes
CONTACTS
The
contacts
of
the
Type
CEX
57
relay
will
close
and
carry
30
amperes
DC
momentarily
.
However
,
the
circuit
breaker
trip
circuit
must
be
opened
by
an
auxiliary
switch
contact
or
other
suitable
means
,
since
the
relay
contacts
have
no
interrupting
rating
.
OPERATING
PRINCIPLES
The
units
in
the
Type
CEX
57
relay
are
four
-
pole
induction
cylinder
units
(
see
Figure
2
)
,
with
schematic
connections
as
shown
in
Figure
6
.
impedance
at
an
angle
.
The
two
front
coils
and
the
two
back
coils
are
energized
with
These
units
measure
4
Courtesy of NationalSwitchgear.com

GEK
-
49778
delta
currents to
produce
polarizing
flux
.
The
same
delta
current
flows
through
the
operating
coil
to
produce
an
operating
flux
.
The
phase
-
to
-
phase
voltage
is
applied
to
the
restraint
coil
to
produce
a
restraint
flux
.
The
torque
produced
by
the unit
results
from
the interaction
of
the
fluxes
.
The
torque
,
therefore
,
is
as
shown
below
:
TR
Torque
=
I
x
I
x
Tg
-
I
x
E
x
x
cos
(
0
-
9
)
100
I
=
delta
current
(
I
/
\
-
Ig
)
TB
=
basic
reach
tap
E
=
phase
-
phase
voltage
(
E
/ \
B
)
TR
=
restraint
tap
in
percent
0
=
angle
between
(
1
^
-
Ig
)
and
E
^
B
0
=
maximum
torque
angle
of
the
relay
At
the
relay
balance
point
,
the
torque
is
zero
.
where
:
TR
0
=
I
x
I
x
TB
-
I
x
E
x
X
cos
(
0
-
0
)
100
TR
x
cos
(
0
-
0
)
=
I
X
I
x
TB
=
I
x
E
x
100
TR
x
cos
(
0
-
0
)
=
I
x
TB
=
E
x
-
cos
(
0
-
0
)
=
-
5
-
x
100
100
I
TR
The
phase
-
to
-
phase
voltage
(
E
)
divided
by
the
delta
current
is
equal
to
the
phase
-
to
-
neutral
ohms
(
Z
)
.
Therefore
:
Z
cos
(
0
-
0
)
=
^
x
100
TR
For
example
,
if
the
basic reach
taps
(
TB
)
are
set
for
1.5
ohms
,
and the
restraint
tap
(
TR
)
is
set
for
50
percent
,
then the
relay
reach
(
Z
)
will
be
:
x
100
=
3
ohms
(
phase
-
to
-
neutral
)
1.5
Z
cos
(
0
-
9
)
=
50
The
equation
,
TB
Z
cos
(
0
-
9
)
=
x
100
TR
is the
equation
for
a
straight
line
when
plotted
on an
R
-
X
diagram
(
Figure
3
)
.
The
equation
also
gives
a
straight
line
if
Z
and
0
are
plotted
on
polar
paper
(
Figure
4
)
.
5
Courtesy of NationalSwitchgear.com

GEK
-
49778
By
selecting
values
for
TB
and
TR
,
the
characteristic
can
be
adjusted
to
be
at
any
distance
from
0.5
to
30
ohms
from
the
origin
.
This
30
ohm
limitation
is
based
on
TR
never
being
less
than
ten
percent
,
its
minimum
recommended
value
.
The
angle
of
maximum
torque
(
0
)
can
be
adjusted
to
be
any
angle
between
5
degrees
lead
and
35
degrees
lead
for
the
top
unit
.
The
bottom
is
identical
to
the
top
unit
,
except
its
polarity
is
reversed
so
that
the
maximum
torque
angle
is
adjustable
from
5
plus
180
,
or
185
degrees
,
to
35
plus
180
,
or
215
degrees
.
The
upper
potentiometer
on
each
unit
(
PI
for
the
upper
unit
and
P
2
for
the
lower
unit
)
is
used
to
set
the
angle
of
maximum
torque
.
With
the
potentiometer
set
for
zero
ohms
,
the
angle
of
maximum
torque
will
be
between
25
and
30
degrees
(
current
leads
voltage
)
.
If
a
jumper
is
added
to
connect
stud
13
to
stud
14
,
and
a
second
jumper
to
connect
stud
15
to
stud
16
,
then
the
angle
of
maximum
torque
can
be
adjusted
to
be
between
5
degrees
and
25
degrees
by
using
the
PI
potentiometer
for
the
upper
unit
,
and
the
P
2
potentiometer
for
the
lower
unit
.
If
jumpers
are
not
added
,
then
these
same
two
potentiometers
(
PI
for
the
upper
unit
and
P
2
for
the
lower
unit
)
can
be
used
to
adjust
the
angle
of
maximum
torque
to
be
between
30
and
35
degrees
.
Angle
of
maximum
torque
can
be
set
between
25
and
30
degrees
using
these
same
two
potentiometers
,
jumpers
should
be
added
or
not
will
vary
from
relay
to
relay
,
and
will
have
to
be
determined
by
test
of
the
relay
actually
being
adjusted
.
Whether
the
CHARACTERISTICS
ANGLE
-
IMPEDANCE
UNIT
The
angle
-
impedance
unit
characteristic
is
a
straight
line
when
plotted
on
an
R
-
X
diagram
.
The
shortest
distance
from
the
characteristic
to
the
origin
is
the
minimum
relay
reach
.
The
minimum
relay
reach
is
determined
by
two
sets
of
taps
.
The
two
tap
plugs
in
the
current
circuits
set
the
basic
minimum
reach
(
TB
)
.
The
tap
plugs
in
the
restraint
circuit
increase
the
basic
reach
as
the
restraint
taps
(
TR
)
are
reduced
from
100
percent
.
The
reach
at
angle
of
maximum
torque
is
equal
,
therefore
,
to
:
TB
x
100
ZM
=
-
TR
ZM
=
minimum
reach
TB
=
minimum
basic
reach
TR
=
restraint
tap
where
:
UPPER
UNIT
The
angle
of
maximum
torque
is
the
angle
that
the
reach
,
Z
^
,
described
above
,
leads
the
"
R
"
axis
(
Figure
4
)
.
This
angle
is
adjustable
from
5
to
35
degrees
lead
.
The
reach
of
the
angle
-
impedance
unit
at
any
angle
is
given
by
the
following
equation
:
tB
x
100
TR
x
cos
(
0
-
0
)
cos
(
0
-
0
)
ZM
Z
=
6
Courtesy of NationalSwitchgear.com

GEK
-
49778
0
=
angle
I
/
\
g
leads
V
/\
g
0
=
angle
of
maximum
torque
See
Table
II
for
values
of
Tg
for
the
various
angles
of
maximum
torque
.
where
:
LOWER
UNIT
This
unit
is
identical
to
the
upper
unit
except
it
is
polarized
to
have
maximum
torque
180
degrees
from
the
upper
unit
.
Therefore
,
the
equation
is
:
ZM
Z
=
cos
(
0
-
9
+
180
)
The
value
Tg
is
given
in
Table
II
for
various
angles
of
maximum
torque
.
The
value
of
TB
is
equal
to
the
tap
value
when
the
maximum
torque
angle
is
set
for
five
degrees
.
If
only
the
upper
potentiometer
(
PI
for
the
upper
unit
,
or
P
2
for
the
lower
unit
)
is
adjusted
,
the
value
of
TR
will
be
as
shown
in
Table
II
.
The
value
of
Tg
can
be
adjusted
by
using
the
lower
potentiometer
(
P
3
for
the
upper
unit
,
or
P
4
for
the
lower
unit
)
;
however
,
it
may
not
be
possible
to
make
Tg
equal
to
the
tap
value
at
all
angles
of
maximum
torque
settings
.
TABLE
II
BASIC
REACH
OHMS
(
TB
)
ANGLE
OF
MAXIMUM
TORQUE
STUDS
13
-
14
STUDS
15
-
16
0.5
OHM
TAP
1.5
OHM
TAP
3.0
OHM
TAP
50
Jumper
1.43
-
1.58
2.85
-
3.15
0.48
-
0.53
10
°
Jumper
0.41
-
0.47
1.22
-
1.40
2.43
-
2.79
15
°
Jumper
1.14
-
1.26
0.38
-
0.42
2.28
-
2.52
20
°
Jumper
0.34
-
0.38
1.02
-
1.13
2.04
-
2.25
25
°
Jumper
0.94
-
1.07
1.89
-
2.13
0.32
-
0.36
30
°
Open
0.31
-
0.37
0.92
-
1.11
1.83
-
2.22
350
Open
0.35
-
0.40
1.05
-
1.20
2.10
-
2.40
TAPPED
AUTOTRANSFORMER
The
reach
in
ohms
of
the
angle
-
impedance
may
be
adjusted
by
two
taps
on
the
autotransformer
.
The
tap
block
and
the
tap
plugs
are
located
on
the
right
side
of
the
relay
.
The
two
tap
leads
marked
#
1
control
the
upper
unit
,
and
the
two
tap
leads
marked
#
2
control
the
lower
unit
.
The
upper
#
1
and
#
2
tap
leads
should
be
connected
to
a
tap
in
the
upper
half
of
the
block
(
zero
to
ten
percent
)
.
The
lower
#
1
and
#
2
tap
leads
should
be
connected
to
a
tap
in
the
lower
half
of
the
block
(
10
to
90
percent
)
.
The
restraint
tap
setting
,
TR
,
is
the
sum
of
the
two
tap
values
into
which
the
#
1
or
#
2
leads
7
Courtesy of NationalSwitchgear.com

GEK
-
49778
are
connected
.
For
example
,
if
the
upper
#
1
lead
is
put
in
the
5
tap
,
and
the
lower
#
1
lead
is
put
in
the
60
tap
,
then
the
#
1
tap
setting
,
TR
is
5
plus
60
,
or
65
.
TR
should
not
be
set
for
less
than
ten
percent
.
BURDENS
CURRENT
CIRCUIT
The
current
burden
imposed
by
each
current
circuit
at
five
amperes
is
listed
in
Table
III
.
TABLE
III
BASIC
OHM
TAP
AMPS
HERTZ
R
X
PF
WATTS
VA
5
60
0.5
0.10
0.09
0.72
2.41
3.35
5
60
1.5
0.12
0.10
0.77
3.06
3.95
5
60
3.0
0.16
4.11
5.13
0.12
0.80
5
50
0.5
0.09
2.14
0.08
0.74
2.89
5
50
1.5
0.11
0.08
0.80
2.75
3.45
5
50
3.0
0.14
0.10
0.81
3.59
4.41
POTENTIAL
CIRCUIT
The
maximum
potential
burden
imposed
by
the
two
units
in
the
relay
is
shown
in
Table
IV
.
*
TABLE
IV
VOLTS
HERTZ
R
X
PF
WATTS
VA
120
60
386
536
0.59
12.74
21.8
120
50
497
-
523
0.69
13.74
20.0
The
potential
burden
is
maximum
when
the
restraint
taps
,
TR
,
are
set
for
100
and
the
angle
of
maximum
torque
is
near
25
degrees
lead
.
At
any
tap
setting
,
TR
,
the
potential
burden
for
each
unit
will
be
as
follows
:
Watts
+
jVars
=
(
A
+
jB
)
x
*
Indicates
Revision
8
Courtesy of NationalSwitchgear.com

GEK
-
49778
where
:
A
=
watts
,
when
TR
=
100
B
=
vars
,
when
TR
=
100
See
Table
V
for
values
of
A
and
B
.
TABLE
V
MAXIMUM
TORQUE
ANGLE
(
LEAD
)
JUMPERS
13
-
14
AND
15
-
16
WATTS
WATTS
(
A
)(
B
)
VOLTS
HERTZ
120
5
°
60
ON
-
2.70
-
3.50
-
6.50
5.20
120
10
°
60
ON
5.70
120
60
25
°
ON
6.30
120
60
300
OFF
8.20
6.20
120
60
350
OFF
6.40
7.55
120
50
50
ON
5.15
-
2.30
-
3.33
-
7.20
10
O
120
50
5.90
ON
120
50
25
°
ON
6.95
120
50
30
°
OFF
6.60
4.83
120
50
35
°
OFF
6.30
4.00
The
total
potential
burden
will
be
the
sum
of
the
burden
from
each
unit
.
Normally
both
units
will
be
set
for
the
same
reach
and
maximum
torque
angle
,
so
it
will
only
be
necessary
to
calculate
the
burden
for
one
unit
.
This
value
will
be
the
burden
on
each
of
the
two
potential
devices
.
The
burden
measured
on
any
unit
may
vary
plus
or
minus
ten
percent
from
the
instruction
book
values
,
due
to
allowable
tolerances
on
capacitors
and
coils
.
CALCULATION
OF
SETTINGS
The
exact
settings
to
be
made
on
the
ohm
units
in
Type
CEX
57
relays
will
depend
on
the
particular
application
.
When
used
in
blinder
applications
,
the
primary
objective
is
to
restrict
the
tripping
area
of
the
tripping
units
to
avoid
operation
on
load
impedance
.
Thus
,
the
reach
setting
should
be
made
so
that
operation
is
prevented
during
maximum
load
flow
or
stable
power
swing
conditions
.
The
angle
setting
should
be
made
so
that
the
ohm
units
will
plot
parallel
to
the
protected
line
.
When
out
-
of
-
step
tripping
during
power
swings
is
required
,
tripping
during
stable
swings
can
be
prevented
,
and
the
breaker
duty
minimized
,
by
permitting
tripping
only
after
a
favorable
angle
is
reached
.
Thus
,
the
reach
settings
to
be
made
will
be
Indicates
Revision
9
Courtesy of NationalSwitchgear.com

GEK
-
49778
Specific
details
for
dependent
on
particular
system
conditions
and
configuration
.
determining
the
settings
for
transmission
line
or
generator
applications
can
be
found
in
the
appropriate
instruction
book
for
Type
NAA
or
GSY
relays
,
ac
mentioned
earlier
.
Once
the
desired
reach
and
angle
has
been
determined
,
it
is
only
necessary
to
calculate
and
set
the
restraint
taps
to
meet
the
desired
reach
.
The
restraint
tap
setting
can
be
calculated
as
follows
:
T
=
(
Ml
(
TB
)
ZM
T
=
restraint
tap
setting
in
percent
Tg
=
basic
reach
tap
ZM
=
desired
reach
in
secondary
ohms
at
the
selected
torque
angle
For
example
,
refer
to
Figure
3
and
4
and
assume
ZM
should
be
set
to
reach
five
ohms
at
the
torque
angle
shown
.
Base
reach
taps
of
0.5
,
1.5
and
3.0
ohms
are
available
.
Always
select
the
highest
base
reach
tap
that
will
provide
the
desired
reach
setting
.
For
this
example
,
use
the
3.0
ohm
tap
.
Therefore
,
where
:
T
=
(
100
)
(
3.0
)
=
60
percent
5
Set
the
restraint
taps
for
both
ohm
units
to
60
percent
.
CONSTRUCTION
The
Type
CEX
57
relays
are
assembled
in
a
medium
size
,
double
end
(
M
2
)
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
circuit
.
The
outer
blocks
attached
to
the
case
have
studs
for
the
external
connections
,
and
the
inner
blocks
have
terminals
for
the
internal
connections
.
Every
circuit
in
the
drawout
case
has
an
auxiliary
brush
,
as
shown
in
Figure
8
,
to
provide
adequate
overlap
when
the
connecting
plug
is
withdrawn
or
inserted
.
Some
circuits
are
equipped
with
shorting
bars
(
see
internal
connections
)
and
on
those
circuits
,
it
is
especially
important
that
the
auxiliary
brush
make
contact
as
indicated
in
Figure
8
with
adequate
pressure
to
prevent
the
opening
of
important
interlocking
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
.
10
Courtesy of NationalSwitchgear.com