GE CEY51A User manual

GEK
-
31144
Insert
Booklet
-
GEK
-
1275
INSTRUCTIONS
Mho
Distance
Relay
Type
CEY
Model
12
CEY
51
B
(
-
)
D
INTRODUCTION
This
insert
booklet
and
the
12
CEY
51
A
(
-
)
D
instruction
book
(
GEK
-
1275
)
form
the
instructions
for
the
12
CEY
51
B
(
-
)
D
re
1
ay
.
DESCRIPTION
The
12
CEY
5
IB
(
-
)
D
relay
is
similar
to
the
12
CEY
51
A
(
-
)
D
relay
except
that
the
contact
circuits
were
arranged
per
the
12
CEY
15
A
(
-
)
A
relay
contact
circuits
.
Check
figure
1
of
this
insert
booklet
for
the
contact
circuit
arrangement
.
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
to
provide
for
every
possible
contingency
to
be
siet
in
connection
with
installation
,
operation
or
Maintenance
.
Should
further
inforsiation
be
desired
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for
the
purchaser
1
*
purposes
,
the
matter
should
be
referred
to
the
6
eneral
Electric
Company
.
POWER
SYSTEMS
MANAGEMENT
DEPARTMENT
m
ELECTRIC
GENERAL
PHILADELPHIA
,
PA
Courtesy of NationalSwitchgear.com

GEK
-
31144
19
17
15
11
13
O
o
o
o
o
20
18
14
16
12
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A
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A
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Ax
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-
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-
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.
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2
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CM
03
-
1
%
X
2
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13
POL
.
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23
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135
15
95
95
15
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10
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~
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03
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TR
02
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TR
01
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2
TR
03
-
1
TR
02
-
3
°
3
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Ax
Ax
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7
0
5
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o
O
o
o
8
10
6
2
X
-
SHORT
FIBBER
01
-
2
=
TOP
UNIT
02
-
3
-
-
MIDDLE
UNIT
08
-
I
=
BOTTOM
UN
IT
FIG
.
I
(
0227
A
7013
-
0
)
Internal
Conm
-
ctions
Diagram
For
The
CEY
51
B
Relay
(
Front
View
)
BC
-
12
/
98
(
100
)
GENERAL
ELECTRIC
METER
AND
CONTROL
BUSINESS
DEPT
.
,
MALVERN
,
PA
19355
Courtesy of NationalSwitchgear.com

GEK
-
1275
K
INSTRUCTIONS
MHO
DISTANCE
RELAY
TYPE
CEY
51
A
GE
Protection
and
Control
205
Great
Valley Parkway
Malvern
,
PA
19355
-
1337
Courtesy of NationalSwitchgear.com

GEK
-
1275
CONTENTS
PAGE
INTRODUCTION
3
APPLICATION
3
CALCULATION
OF
SETTINGS
4
RATINGS
6
Contacts
Target
&
Seal
-
in
Unit
7
7
8
OPERATING
PRINCIPLES
8
CHARACTERISTICS
Mho
Unit
Tapped
Autotrarsformer
Current
Circuits
Potential
Circuits
.
.
.
8
11
11
12
13
CONSTRUCTION
14
RECEIVING
,
HANDLING
,
STORAGE
14
ACCEPTANCE
TESTS
Visual
Inspection
Mechanical
Inspection
Electrical
Checks
,
Mho
Unit
Electrical
Tests
-
Target
Seal
-
in
14
14
15
18
18
INSTALLATION
PROCEDURE
Location
Mounting
Connections
Visual
Inspection
Mechanical
Inspection
Portable
Test
Equipment
Electrical
Tests
on
the
Mho
Units
18
18
18
19
19
19
19
22
INSPECTION
Target
&
Seal
-
in
Unit
Mho
Units
22
22
23
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
Contact
Cleaning
23
23
SERVICING
23
Control
-
Spring
Adjustments
Ohmic
-
Reach
Adjustment
.
.
.
Angle
of
Maximum
Torque
.
.
Directional
Check
24
24
27
27
RENEWAL
PARTS
28
LIST
OF
FIGURES
Cover
(
8036548
)
2
Courtesy of NationalSwitchgear.com

GEK
-
1275
MHO
DISTANCE
RELAY
TYPE
CEY
51
A
INTRODUCTION
The
CEY
51
A
relay
is
an
extended
-
range
,
three
-
phase
,
high
-
speed
,
single
-
zone
,
mho
directional
distance
relay
.
It
is
constructed
of
three
single
-
phase
units
in
one
L
2
-
D
case
with
provisions
for
single
-
phase
testing
.
One
target
and
seal
-
in
unit
provides
indication
of
operation
for
all
three
units
.
The
transient
overreach
of
this
relay
is
limited
by
design
so
that
it
is
suitable
for
use
as
a
first
-
zone
device
.
One
CEY
51
A
relay
will
provide
complete
one
-
zone
protection
for
three
-
phase
,
phase
-
to
-
phase
and
double
phase
-
to
-
ground
faults
.
APPLICATION
The
CEY
51
A
relay
,
because
of
its
low
transient
overreach
(
maximum
of
six
percent
)
and
its
memory
action
,
is
primarily
a
first
-
zone
tripping
relay
.
As
such
,
it
is
applicable
as
a
high
-
speed
tripping
unit
in
direct
and
permissive
underreaching
transferred
tripping
schemes
,
as
well
as
a
first
-
zone
tripping
relay
in
straight
distance
and
carrier
schemes
.
When
applying
this
relay
for
the
protection
of
a
given
circuit
,
it
is
advantageous
to
set
the
relay
on
the
highest
basic
-
minimum
-
reach
tap
that
will
accomodate
the
desired
reach
setting
,
operating
torque
level
.
For
first
-
zone
applications
,
the
relay
may
be
set
for
as
much
as
90
%
of
the
distance
to
the
remote
terminal
.
This
will
ensure
the
highest
possible
Since
all
forms
of
the
CEY
51
A
relay
have
adjustable
maximum
-
torque
angle
available
,
a
consideration
of
which
angle
to
use
may
arise
.
It
is
suggested
that
arc
resistance
for
faults
near
the
relay
should
be
considered
in
this
regard
.
The
smaller
the
angle
of
maximum
torque
,
the
greater
the
arc
resistance
that
the
unit
will
accommodate
.
The
basic
sensitivity
of
the
CEY
51
A
relay
will
depend
on
the
basic
minimum
tap
that
is
used
.
Figure
2
gives
the
steady
-
state
and
dynamic
sensitivity
of
the
relay
.
In
order
to
be
sure
that
the
relay
will
reach
no
less
than
90
%
of
its
setting
,
the
minimum
three
-
phase
fault
current
flowing
in
the
relay
for
a
fault
at
the
remote
end
of
the
line
should
be
at
least
those
values
given
in
table
I
.
3
Courtesy of NationalSwitchgear.com

GEK
-
1275
TABLE
I
Basic
Minimum
Tap
Setting
Restraint
Tap
Setting
Min
.
3
-
phase
Fault
Current
Required
0.2
ohms
25
%
15.0
amps
0.2
50
%
22.5
0.2
100
%
30.0
0.375
0.375
0.375
25
%
8.0
50
%
12.0
100
%
16.0
0.4
25
%
7.5
0.4
50
%
11.25
0.4
100
%
15.0
0.75
25
%
4.0
0.75
50
%
6.0
0.75
100
%
8.0
0.8
25
%
3.75
50
%
0.8
5.6
100
%
0.8
7.5
1.5
25
%
2.0
1.5
50
%
3.0
1.5
100
%
4.0
3.0
25
%
1.0
3.0
50
%
1.5
100
%
3.0
2.0
6.0
25
%
0.5
6.0
50
%
0.75
6.0
100
%
1.0
The
CEY
51
A
and
its
companion
zone
-
packaged
relays
may
be
combined
in
many
different
ways
for
use
in
different
schemes
,
including
straight
distance
protection
,
directional
-
comparison
carrier
protection
,
permissive
overreaching
,
permissive
-
and
di
rect
-
underreaching
transferred
tripping
and
many
different
back
-
up
schemes
.
Figure
3
illustrates
the
external
connections
to
the
CEY
51
A
when used
in
conjunction
with
a
CEY
52
A
,
a
CEB
52
A
and
an
RPM
21
D
for
three
-
zone
protection
of
a
transmission
line
against
all
multi
-
phase
faults
.
The section under
CALCULATION
OF
SETTINGS
provides
a
worked
example
for
a
typical
application
of
the
CEY
51
A
relay
.
CALCULATION OF
SETTINGS
Consider
a
230
kV
transmission
line
50
miles
long
having
a
phase
-
to
-
neutral
impedance
of
:
zprim
=
0.14
+
j
0.80
ohms
per
mile
4
Courtesy of NationalSwitchgear.com

GEK
-
1275
Zprim
=
50
(
0.14
+
j
0.80
)
=
7
+
j
40
ohms
total
PT
Ratio
=
230
,
000
/
115
=
2000
/
1
CT
Ratio
=
600
/
5
=
120
/
1
Assume
that
the
minimum
three
-
phase
fault
current
flowing
in
the
relay
for
a
three
-
phase
fault
at
the
remote
end
of
the
line
is
about
8
secondary
amperes
,
and
for
a
close
-
in
fault
,
it
is
11
secondary
amperes
.
CT
Ratio
Zsec
.
=
Zprim
PT
Ratio
^
sec
.
=
(
7.0
-
t
j
40.0
)
120
=
0.42
+
j
2.4
ohms
7
UUTT
=
2.43
/
80.5
o
ohms
Zsec
.
Assume
that
the
CEY
51
A
is
to
be
used
to
provide
first
-
zone
protection
and
it
is
desired
to
set
the
relay
to
protect
90
%
of
the
line
0.9
(
Zsec
)
=
0.9
(
2.43
)
For
this
application
,
the
highest
suitable
basic
minimum
tap
is
1.5
ohms
.
/
80.5
=
2.19
/
80.5
The
ohmic
-
reach
equation
given
in
the
section
under
OPERATING
CHARACTERISTICS
-
TAPPED
AUTOTRANSFORMER
is
used
to
obtain
the
required
tap
setting
.
(
100
)
(
Min
.
Ohms
)
Cos
(
0
-
9
)
Percent
Tap
Setting
=
Z
Minimum
Ohms
=
1.5
Z
=
Zsec
.
=
2.19
ohms
0
-
80.50
The
selection
of
the
maximum
-
torque
angle
for
a
first
-
zone
relay
should
depend
primarily
on
accommodation
of
arc
resistance
.
Smaller
maximum
-
torque
angles
will
accommodate
more
arc
resistance
than
larger
maximum
-
torque
angles
.
Since
arc
resistance
is
independent
of
line
length
,
the
shorter
lines
will
provide
the
greatest
problem
on
this
score
because
of
the
shorter
reach
setting
on
the
relay
.
Thus
,
on
short
lines
it
is
desirable
to
use
smaller
angles
of
maximum
torque
.
On
longer
lines
,
where
the
mho
unit
must
be
set
with
a
longer
reach
,
it
would
have
more
significant
arc
-
resistance
capability
even
with
a
larger
angle
of
maximum
torque
.
Another
factor
to
consider
is
immunity
to
system
swings
.
In
general
,
an
angle
of
maximum
torque
approaching
the
angle
of
the
line
will
provide
the
greatest
immunity
to
system
swings
.
Thus
,
for
most
lines
,
the
75
°
setting
would
provide
the
greatest
immunity
.
5
Courtesy of NationalSwitchgear.com

GEK
-
1275
Since
system
swings
are
not
usually
a
problem
on
short
lines
,
but
arc
resistance
is
,
and
since
arc
resistance
may
not
be
a
problem
on
long
lines
but
system
swings
might
be
,
it
is
a
good
general
practice
to
use
the
lower
maximum
-
torque
angle
universally
except
where
system
swings
may
be
a
problem
.
Since
this
is
a
short
line
,
the
normal
60
o
angle
of
maximum
torque
will
be
used
.
Thus
,
9
=
600
.
100
(
1.5
)
Cos
(
80.5
-
60
)
64
%
Percent
Tap
Setting
=
2.19
T
=
64
%
A
check
with
the
table
in
the
APPLICATION
section
will
indicate
that
the
minimum
fault
current
of
8
amperes
is
sufficient
to
operate
the
relay
for
the
settings
selected
.
A
plot
of
this
characteristic
on
the
R
-
X
diagram
will
show
that
the
unit
will
accommodate
approximately
1.15
secondary
ohms
of
arc
resistance
for
a
fault
at
the
ori
gi
n
.
A
rough
estimate
of
the
arc
resistance
that
a
relay
will
see
for
a
multi
-
phase
fault
is
given
by
RA
=
3
130
where
130
=
three
-
phase
fault
current
flowing
in
the
relay
.
Since
the
minimum
three
-
phase
fault
current
in
the
relay
for
a
close
-
in
fault
was
given
as
11
amperes
,
the
maximum
arc
resistance
is
0.27
secondary
ohms
RA
=
11
The
60
°
relay
setting
will
accommodate
this
very
easily
and
so
would
a
75
o
setting
.
However
,
the
6
O
0
setting
will
accommodate
more
arc
resistance
near
the
balance
point
,
and
since
the
line
is
short
,
and
if
system
swings
are
not
apt
to
be
a
problem
,
the
60
o
setting
is
desirable
.
RATINGS
The
type
-
CEY
51
A
relay
covered
by
these
instructions
is
available
for
120
volts
,
5
amperes
,
60
cycle
rating
.
The
one
-
second
rating
of
the
current
circuits
is
225
amperes
.
The
basic
minimum
reach
and
adjustment
ranges
of
the
mho
units
are
given
in
Tabl
e
II
.
6
Courtesy of NationalSwitchgear.com

GEK
-
1275
TABLE
II
MINIMUM
REACH
MHO
RANGE
ANGLE
UNIT
0.2
/
0.4
/
0.8
0.375
/
0.75
/
1.5
0.75
/
1.5
/
3.0
0.2
to
8
0.375
to
15
0.75
to
30
60
*
*
01
-
2
60
*
*
or
02
-
3
60
*
*
or
or
or
1.5
/
3.0
/
6.0
1.5
to
60
60
**
03
-
1
Adjustment
taps
are
set
for
1.5
ohms
(
or
0.4
ohms
)
*
*
The
angle
of
maximum
torque
can
be
adjusted
up
to
75
o
.
The
reach
of
the
mho
units
at
the
75
o
setting
will
increase
to
approximately
103
%
of
its
reach
at
the
60
o
setting
.
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
two
tap
screws
on
a
two
-
section
tap
block
located
at
the
back
of
the
relay
(
see
Figure
1
)
.
The
position
of
these
screws
determines
the
tap
setting
of
the
two
primary
windings
of
the
transactors
(
TR
-
01
-
2
,
TR
-
02
-
3
,
TR
-
03
-
l
)
.
The
ohmic
reach
of
the
mho
units
can
be
adjusted
in
1
%
steps
over
a
10
/
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
.
CONTACTS
The
contacts
of
the
CEY
51
A
relay
will
close
and
momentarily
carry
30
amperes
DC
.
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
.
TARGET
SEAL
-
IN
UNIT
The
target
seal
-
in
unit
used
in
the
CEY
51
A
relay
has
ratings
as
shown
in
Table
III
.
TABLE
III
0
,
6
/
2.0
Amp
0.2
/
2.0
Amp
2.0
2.0
0.6
0.2
Carry
30
Amps
for
(
seconds
)
Carry
10
Amps
for
(
seconds
)
Carry
Continuously
(
Amp
)
Minimum
Operating
(
Amp
)
Minimum
Dropout
(
Amp
)
DC
resistance
(
Ohms
)
60
Hz
Impedance
(
Ohms
)
50
Hz
impedance
(
Ohms
)
2.2
0.5
3.5
0.05
5.0
30.0
0.45
2.0
2.6
1.2
2.3
0.37
2.0
2.0
0.6
0.2
0.5
0.15
0.5
0.24
0.78 0.18
0.65
6.2
0.65
0.54
5.1
0.54
0.05
8.3
50
42
2.5
Amp
@
125
VDC
DC
Resistive
Interrupting
Rating
(
Amps
)
7
Courtesy of NationalSwitchgear.com

GEK
-
1275
OPERATING
PRINCIPLES
The
mho units
of
the
CEY
51
relay
are
of
the
four
-
pole
induction
-
cylinder
construction
in
which
torque
is
produced
by
the
interaction
between
a
polarizing
flux
and
fluxes
proportional
to
the
restraining
or
operating
quantities
.
The
schematic
connections
of
the
Mi
unit
are
shown
in
Figure
4
.
poles
,
energized
by
phase
-
to
-
phase
voltage
,
produce
the
polarizing
flux
,
from
the
front
and
rear
poles
,
energized
by
the
difference
between
the
secondary
voltage
of
transactor
TR
-
0
i
_
2
and
a
percentage
of
the
same
phase
-
to
-
phase
voltage
,
interacts
with
the
polarizing
flux
to
produce
torque
.
The
torque
equation
can
be
written
as
follows
:
The
two
side
The
flux
Torque
=
KE
(
IZJI
_
JE
)
3
(
1
)
cos
where
:
E
=
phase
-
to
-
phase
voltage
(
Ej
2
)
I
=
delta
current
(
II
-
12
)
ZjT
=
transfer
impedance
of
transactor
TR
-
0
I
_
2
(
design
constant
)
p
=
angle
between
E
and
(
IZJI
-
E
)
K
=
design
constant
T
=
autotransformer
tap
setting
That this
equation
(
1
)
defines
a
mho
characteristic
can
be
shown
graphically
by
means
of
Figure
5
.
The
vector
IZJ
13
at
an
angle
0
determines
the
basic minimum
reach
of
the unit
for
a
particular
tap
setting
of
the
transactor
TR
-
0
I
_
2
primary
.
Assuming
finite
values
of
E
and
(
IZT
1
-
TE
)
,
the
balance
point
,
torque
=
0
,
will
occur
where
cos
=
0
,
that is
,
where the
angle
P
is
90
o
.
The
locus
of
the terminus
vector
TE
(
Point
A
in
Figure
5
)
that
will
cause
the
angle
$
to
be
always
900
in
a
circle
passing
through
the
origin
and
with
the
vector
IZT
1
as
a
diameter
.
B
Considering
further
the
diagram
in
Figure
5
,
we
note
that the
angle
is
less
than
900
for
an
internal
fault
(
point
C
)
and
net
tprque
will
be
in
the
closing
direction
(
cos
^
is
positive
)
;
and that the
angle
P
is
greater
than
90
°
for
an
external
fault
(
point
D
)
and
the
net
torque
will
be
in
the
opening
direction
(
cos
$
is
negative
)
.
B
See
Figure
5
,
Graphical
Representation
of
Mho
Operating
Principle
.
CHARACTERISTICS
MHO
UNIT
Impedance
Characteristic
The
impedance
characteristic
of
the
mho
unit is
shown
in
Figure
6
for
the
0.75
-
ohm
basic
-
minimum
-
reach
setting
at
a
maximum
-
torque
angle
of
6
O
0
.
This
characteristic is
obtained
with
the terminal
voltage
of
the
relay
supplied
directly
to
the
restraint circuit
of
the
mho unit
,
that
is
,
with
the
mho
taps
on
the
auto
-
transformer
tap
block
set
at
100
%
.
This
circular
impedance
characteristic
can
8
Courtesy of NationalSwitchgear.com