GE GCY51F Series User manual

I
N
ST RU C T ION
S
MHO
Distance
Relay
Type
GCY51F
GEK-26437B
Supersedes
GEK-2643Th
GENERALS
ELECTRIC

DESCRIPTION
APPLICATION
.
RATINGS
ONE
SECOND
RATINGS
AND
H 2
OFFSET
H 1
AND
N 2
TAP LOCATIONS
12GCY51F1A
12GCY5IF2A
CONTACTS
TARGET/SEAL-IN
UNIT
BURDENS
12GCY51F1A
CURRENT
CIRCUITS
POTENTIAL
CIRCUITS
H 1
UNIT
M 2
UNIT
12GCYS1F2A
CURRENT
CIRCUITS
POTENTIAL
CIRCUITS
H 1
UNIT
M 2
Unit
CALCULATION
OF
SETTINGS
OPERATING
PRINCIPLES
H 1
UNIT
H 2
UNIT
CHARACTERISTICS
H 1
UNIT
IMPEDANCE
CHARACTERISTIC
UNDERREACH
MEMORY
ACTION
TRANSIENT
OVERREACH
...
OPERATING
TIME
UNIT
IMPEDANCE
CHARACTERISTIC
UNDERREACH
MEMORY
ACTION
TRANSIENT
OVERRREACH
OPERATING
TIME
CONSTRUCTION
CASE
GENERAL
ELECTRICAL
TESTS
DRAWOUT
RELAYS
GENERAL
POWER
REQUIREMENTS
GENERAL
RECEIVING,
HANDLiNG
AND STORAGE
PERIODIC
CHECKS
AND ROUTINE
MAINTENANCE
CONTACT
CLEANING
MECHANICAL
INSPECTION
SERVICING
CONTROL
SPRING
ADJUSTMENT
CLUTCH
CHECKS
CLUTCH-ELECTRICAL
TESTS
BASIC
MINIMUM
REACH
TESTS
ANGLE
OF
MAXIMUM
TORQUE
REACH
TAP CHECK
M 1 -M 2
OFFSETS
TESTS
TARGET/SEAL-IN
INSTALLATION
PROCEDURE
LOCATION
MOUNTING
CONNECTIONS
RENEWAL
PARTS
GE
K-254
37
CONTENTS
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2

GEK-26437
MHO
DISTANCE
RELAY
TYPE
GCY5IF
DESCRIPTION
The
GCY51F
is
a
single—phase
inho
relay
consisting
of
two
units
and
associated
auxiliaries
mounted
in
the
large
(La)
double-ended
case.
The
lower
unit
is an
M 1
unit
which
is designed
for
first
zone
application.
The
upper
unit
is an
M 2 unit
which
is
designed
for
second
zone
applications
only.
The
second
zone
is
offset
in
the
forward
direction
to
provide
a
figure
8”
characteristic
suitable
for
ling,
heavily
loaded
lines. GEK-26437
covers
a
5 ampere,
60
hertz
model (Form
1A)
and
a
1 ampere,
50
hertz
model (Form
2A).
The
impedance ranges
and
offsets
are
shown
in Table
I.
Since
the
one
ampere
relay
has
five
times
the
impedance
range
of the
five
ampere
relay,
the
application
and
calculation
of
setting
discussion
is
applicable to
the
one
ampere
relay
by multiplying
the
impedances
by
five.
The
internal
connections
diagram
is
as
shown
in
Figure
13.
APPLICATION
The
GCY51F
relay
is
used
for
phase
fault
protection
of
a
transmission line.
It
has
a distinctive
figure
eight’
characteristic
which
is
obtained by using
two
separate
mho
units
per
phase
of the
line.
The
first
zone
mho
unit,
M 1 ,
has
a characteristic
which
passes
through the origin
of
the
R-X
diagram
as
in the
usual
application.
The
characteristic
of the
second
zone
mho
unit,
M 2 ,
s
offset in
the
forward
direction
by
an
adjustable
amount which
allows
overlapping
of
the
two
characteristics.
See
the
R-X
plot
o
the
character
istics in
Fig.
11.
The
‘figure
eight’
characteristic
is
applied
where
a relay
with
a
long
forward reach
setting
is
required
and
at the
same
time
it is
necessary to
accoirmiodate
heavy
line
loadings
or
nhinor
system
swings
without
caus
ing
relay
operation.
The
M 1
first
zone
unit
may
be
used
alone to provide
instantaneous tripping
for
a
portion
of
the
protected
line.
The
N 2 second
zone
unit
is
used
with
a timer
to provide
time-delay
back-up tripping
for
the balance of
the
protected
line
and
a
portion
of the
next
line
section.
The
trip
contacts
of
both
units
connected in
parallel will
provide the
overreaching tripping
characteristic
needed
for
directional
comparison
or
trans
ferred
tripping
pilot—relaying
schemes.
Typical external
connections are
shown
in
Figs.
l6A
and
B
for
the
scheme
of
protection described.
This
shows
the
need
for auxiliaries
such
as
a timer
and
a tripping
rectifier
for
circuit
isolation
in
addition
to
the
auxiliaries
needed
for
whatever
type
of
pilot-relaying
scheme
is
selected.
If
the
GCYS1F
is
used
in a
pilot-relaying
scheme
with
the line
side
potential
and
high speed reclosing,
it
is
recorrieended
that
overcurrent
fault
detectors be used
to
supervise the
trip
circuits.
When
setting
the
relay
units,
it
is reconnended
that
the
offset
setting
on
the
M 2
unit
not
exceed
80
per
cent
of tho
forward
reach
setting
of
the
Ml
unit.
This
will
insure
at
least
a 20
percent
overlap
of
the
two
characteristics
based
on
the
reach
setting
of
the N 1
unit.
When
selecting
a
basic
minimum
ohmic
reach
tap
to
protect
a
line,
it
is
desirable
to
select
the
highest
one
that
will
accoriiriodate the
desired
setting. For
example,
if
a
5
ohm
setting
is desired
on the
M 1
unit,
the tap
selected should
be
3
ohms
minimum
rather
than
the
0.75
or
1.5
ohm
tap.
This
will
insure
the
highest
possible
torque
level
in
the
relay.
Refer
to
the
sec
tion
on
CALCULATION
OF
SETTINGS for
a
worked
example
of
determining the
required
settings
for
a
typical
application.
Refer
to
the
section
on
CHARACTERISTICS
for
the
relay
unit
operating
time
curves,
Fig.
8
and
Fig.
10
and
the
relay
reach
vs.
fault
current
curves
in Fig.
7
and
Fig.
9.
In
the
normal
transmission
line
application
the
N 1
first
zone
unit
reverse
offset
is set
at
zero.
Thus,
this
unit
will
operate
for
faults
only
in
the
protected
line
section
and
not
operate
for
bus
faults
behind
the
relay
location.
However,
when
the
protected
line
ends
in
a transformer
and
the
relay
is
connected to
CT’s
and
PT’s
on
the
line
side
of
the
transformer,
the
M 1
first
zone
reverse
of,set
may be
set at
0.5
ohm
so as
to
reach
backwards
part
way
into
the
impedance of
the
transformer
bank.
Thus,
the
relay
will
remain
picked
up
even
for
a
zero
voltage
line
fault
right
at
the transformer terminals
independent of
first
zone
memory
action.
The;e
instructions
do
not
purport to cover
all
details or
variations in
equipment
nor
to
provide
for
ever.;
possbie 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
sufficicntly
for
the
purchaser’s
purposes,
the
matter
should
be
reterz-ed
to
the
General
Electric
Company.
To
the
extent
required
the
products described herein
meet
applicable
ANSI,
IEEE
and
NEMA
standards;
but
no
such
assurance
is
given
with
respect
to
local
codes
and ordinances
because they
vary
greatly.
3

GEK-26a37
RATINGS
-
c-stance
relays
are
rated
as
follows
DE
SECOND
RATINGS
The
one
second
ratings
of
the
current
circuits of
the
12GCY51F(-)A
relays
are
listed
below.
K =
12 t
rating chart.
TABLE
I
equation
12GCY51F1A
J
BASIC MIN.
OHMIT
ANGLE
MAX. OFFSET
RANGE
ANGLE
OF
UNIT
4
REACH
0-N__—
RANGE
jJRQUE
0—N
OFFSET
Ml
.75/1.5/3.0
0.75-30
60-75°
Lag
0/0.5
Ohm
255°
Lag
M 2
1/2/3
1.0
—3.0
60-75°
Lag
0—4
Ohms
750
Lag
— —__________
(1.0
Ohm
steps)
TABLE
II
12SF
Y51F2J\
______
____________
_____
________
___________
_______________
r
UASIC
MIS.
OFFSEF
RANGE
ANGLE
OF
UNIT
REACH
0-N 0-N
OFFSET
3.75/7.5/15
3.75-150 60-75° Lag
0/2.5
Ohms
255°
Lag
N 2
5/10/15
5.0
—150 60—75°
Faq
0—20
Ohms
75°
Faq
L
___L”_steps)
__
__
Thcsc
rridys
are
factory
adjusted
br
the
basic
minimum reach
dt
the
75
deqree
lag,
angle
ot
maximum
rJr’JIC
1-1
though
the
units
can
he
adjusted to a
60
degree
lag,
angle
of
maximum
torque,
a reduction
of
the
ciii
urn
reash
can
be expected.
self’,
at
600
lag
3
reduction
in reach.
jri
:.
at
GO°
lag
2O
reduction
in
reach.
Other
magnitudes
of
current
can
be
applied
for
various
periods
of
time
by
applying
the
following
t=
The
and
II.
Constant.
(See
one
second
Applied
current
(rms).
Time
(Seconds).
basic
minimum reach
range,
angles
of
maximum
torque,
offset
range
and
angle
are
listed
in
Tables
I
OHMIC
0—14
H
AN
C L
ANGLE
MAX.
TORQUL
4

GEK-26437
The
basic
minimum
reach can
hr
extended
up
to
the
maximum
ohmic
0—H
reach
by
reducing
the
uri’c
restraint
transformer.
This
can
be
accomplished
by
applying
the following
equation.
Transf.
setting
()
1P
---)_X
ba 4 ’
“nium
rech
tap.
Z
—N
Z
0-N
= desired
reach
Basic
iciminmum
reach
tap
=
select
the
highest
reach
tap
below
the
Z 0-N
setting
desired.
M 1
and
N 2 _Offset
The M 1
unit
has
a
reverse
offset,
where
the
forward
reach
of
the
unit
is
maintained
and
the
insertirn
of
an
offset
increases
the
diameter
of
the
characteristic
so
that
it
extends
in
a
reverse
direction,
providing
an
offset
equal
to
the
offset
tap
selected
(+)
10
percent.
The
M 2
unit
has
a
forward
offset,
where
the
diameter
of
the units
characteristic
is
moved forward
along
the
unit’s
angle
of
maximum
torque,
equal
to
the
offset
tap
(+)
10
percent.
and
M 2
Tap
Locations
12PCY51F1A
The N 1
unit
reach taps
are
located
on
two
tap
plates
and
block
located
to
the
right
of
the
Ml
unit
(lower
unit).
The
basic
minimum
reach
taps are
marked
on
the
plate.
The
taps
are
selected
by
two
insulated
tap
screws
and
should
be
set
identically
for
a particular
reach
setting.
The
M 1
offset
tap is
located
at
the
rear of
the
relay
behind
the
M2
unit
(upper
unit).
The
offset
is
a
fixed
value
and
is
selected
by
a
link
in
an
‘In”
or
Out’
consideration.
The N 1
unit
restraint
transformer
is
located
on
the
left
side
of
the
relay
front
view.
It
has
taps
in
one
percent
dnd
10
percent
steps
which
are
selected
with
two
insulated
tap
plugs
and
movable
jumper
leads.
The
N 2
unit
reach
taps are
located
behind
the relay
on
a
Bakelite
tap
block,
using
links
to
obtain
the
basic minimum
reach.
Both
sets
of
links
must
be
set identically
for
any
basic
reach
desired.
Table
HI
indicates
the
connections
for
the
basic
minimum
reach
setting.
TABLE
III
RELAY
BASIC
MINIMUM A”
“B”
MODEL
REACH
0-N
LINKS
LINKS
1
Ohm
1
0
GCY51F1A
2
Ohms
0
2
3Ohms
1
2
5Ohms
5
0
GCY51F2A
10
Ohms
0
10
l5Ohms
5
j
10
The
M 2
unit
offset
is
located
at
the
front
of the
relay
just above
the N 2
unit.
The
offset
taps are
marked
--0, 1, 2, 3,
4
ohms and
are
selected
by
a
sliding
lead
and
captured
screw.
The N 2
restraint
transformer
is
located
on
the right
side
of
the
relay
front view.
It
consists
of
a
ta
block with
taps ranging
in
one
percent
steps
and
in
ten
percent
steps.
The
tans arr
selected
with
two
insu
lated
tap pluqs
and
movable
jumper
leads.
12GCYB1F2A
The
location
of
units and
components
of
the
12GCY51F2A
is
the
same
as
in
the
12GCY51Fi
relay,
except
that
it
is
used
with
one
ampere
current transformers,
with th
Dhmic range
equai
to
five
times
the 12GCYS1F1A
relay.

GEK-26437
Contacts
The contacts of
these
distance relays
when closed due
to
a fault, will momentarily carry
30 amperes up
jltS d-c.
However,
the
circuit
breaker trip circuit must be opened by an auxiliary switch or
by
some
other
suitable
means since the relay contacts
do not have an interrupting
rating.
Target/Seal-in Unit
The
relays have a 0.6/2.0
ampere d-c tap rating.
The
electrical parameters
are listed
in Table
IV.
TABLE IV
TARGET
SEAL-IN
UNIT
0.6
AMP TAP
2.0
AMP TAP
Minimum Operating 0.6
amps
2.0
amps
Carry Continuously 1.5
mps
3.5
amps
Carry 30 Amps for 0.5 secs. 4 secs.
Carry 10 Amps for
4
secs. 30
secs
0-C Resistance
0.6
ohms
0.13 ohms
60 Cycle Impedance 6
ohms
0.53
ohms
BURDENS
Current Circuits
The
maximum
current burden Imposed
on
each
GCY51F(-)A
relays
is
shown in
Table V.
AMPS HERTZ R X P.F. W.
5 60 0.3
0.05
0.98 7.5
7.6
This data
is for
the 3.0 ohm basic reach tap
of
the M 1 and M 2 units.
The
burden
with the
M 1
unit in
the 1.5 or 0.75 ohm tap or
with
the M 2 unit in the 2 or
1 ohm
tap
will be
slightly
lower.
Potential Circuits
The
maximum
potential
burden imposed on
each
potential transformer at
120 volts,
60
hertz
Table VI
for restraint
transformer
settings at 100 percent.
TABLE VI
is shown in
CIRCUIT
I
R
JX
P.F.
WATTS
V.A.
M 1
Restraint 3200
JO 1.0
4.5 4.5
N 1 Polarizing 1300 -J680
0.89
8.7 9.8
M 2
Restraint
1150 +J]370
0.64
5.2 8.1
M 2 Polarizing 1440 -J217 0.99 9.7 9.8
The potential burdens at
restraint
from toe following
formula.
transformer
settings
of
less than 100 percent
can he
calculated
, Unit
VA
(a
+ Jb)rMl
tap
setting()1
2
+ (C + Jd)
[input
tap
setting
(j_J
1 2GCY51 F1A
current transformer
at
five amperes for a
set of three
TABLE V
6

GEK-26437
TI 2
Unit
VA
=
(e
+
if)
rM2
tap
setting
()
1
2
+ Jh)
Linput
tap
setting
(%)J
The
terms
(a
+ Jb),
(C
+
Jd)
etc.
represent
the
burdens
of
the
Mi
and
M 7
potential
circuits
expressed
in
watts
and
vars
with
the
restraint
taps
in
100
percent.
Table
VII
gives
the
values
for
these
tenlis.
TABLE
VII
1
CIRCUIT
TERM
(WATTS
+
J
VARS)
(WATTS
+ 3
VARS)
TI 1
Restraint
a +
Jb
4.5
+
JQ
Mi
Polarizing
c +
Jd
8.7
-
34.5
M 2
Restraint
e
+ if
5.2
+
J6.2
M 2
Polarizing
y
+
Jh
9.7
—
31.5
Total
burden
can
be
obtained
by
adding
the
M 1
and
M 2
watts
and
vars
for
each
unit
as
determined
by
the
above
Table
VII and
converting
the
total
to
volt-amperes.
1
2GCY51
F2A
Current
Circuits
The
maximum current
burden
imposed
on
each
current
transformer
at
one
ampere
for
a set
of
three
relays
is
listed
in
Table
VIII.
The
data
is for
a
relay
set
at
the
maximum
reach
taps.
TABLE
VIII
AMPS
HERTZ
R
X
P.F.
WATTS
V.A.
1
50
11.90
16.40
0.587
11.90
20.27
Potential Circuits
CIRCUIT
R
ix
P.F.
WATTS
V.A.
VARS
TI 1
Restraint
19.60
32279
3.652 3.12
4.78
3.62
M 1
Polarizing
14.53
-3817
0.872 7.53
8.63 —4.21
TI 2
Restraint
11.65
31866
0.53
3.46 6.52
5.52
TI 2
Polarizing
15.42
-J769
0.89 7.34 8.25
-3.26
The
potential
burdens
at
restraint
transformer settings
of
less
than
100
percent
can
be
calculated
from
the
following
equations.
M 1
Unit
VA
= (a
+
Jb)EM1
tap
setting
()
1
2
+
(C
+
3d)
[input
tap
setting
(%)]
TI 2
Unit
VA
(e
+
Jf)r2
tap
setting
2
+
+ Jh)
Linput
tap
setting
(‘)J
The
terms
(a
+ 313)
to
(g
+
JH)
represent
the
burdens
of
the
Ml
and
TI 2
potential
circuits
expressed in
watts and
vars
with the
restraint
taps
in
100
percent.
Table
X
lists
the
values
of
these
terms.
The
input
tap
settings
in
the
above
equations are
100
percent.
7
TABLE
IX

GEK-26437
TABLE X
CIRCUIT
TERM
WATTS
+ J
VARS
WATTS
+ J
VARS
-
H 1
Restraint
a + Jb 3.12
+ J3.62
M 1 Polarizing
C
(+) Jd
7.53
- J4.2l
H 2
Restraint
e + Jf
3.46
+ J5.52
H 2
Polarizing
g
(±)
Jh
7.34
- J3.76
The total
burden
can be obtained by
adding
the
H 1 and N 2
watts
and
vars for
each
unit
as
listed In
Table
X
and
converting to
volt—amperes as
indicated
in the
equations
for
transformer
settings
less than 100
percent.
The maximum burden
imposed on the potential
transformer by
the
offset
transactor
in addition to
the
unit’s
burden
in
Table IX is shown
In XI.
TABLE
XI
R
JX
P.F. WATTS
V.A.
VARS
7.66
11.59 0.66 7.66
11.60
8.72
If offset
is used
the volt-amperes
of the
offset
transactor must be
added
to the
M 1 and N 2
units
volt
amperes to
determine
the maximum
volt
amperes
of the relay’s potential
circuit
with offset.
CALCULATION
OF SETTINGS
The
following
is a typical
worked example
of how
to
determine
the reach and offset
tap
settings
for the
relay to
provide the
proper line
protection.
Assume
a
230kV line
100 miles long with
a positive sequence
primary
impedance
of
Z(pri)
= 8O
With a CT ratio of
1200/5
and
a
PT
ratio
of
2000/1
the
secondary impedance
becomes
CT
Ratio
Z(sec)
= Z(pri) X
PT Ratio
Z(sec)
ohms
Set the M 1
first
zone
unit to
90
percent of
the protected line section
taking
into
account the
dif
ference
between
the line
angle
0
= 85
degrees
and
the H 1 angle of maximum
torque 9 = 75
degrees by the func
tion
of cos
(0—9).
The
N 1
reach at
its angle of
maximum torque should
be
- 0.90 x 9.6
— 8.64
—
—
— 8.77
ohms
Using the three
ohm
basic minimum
reach tap, the
N 1
tap
setting
will
be
TAP
(M 1 )
= —-
= 34
Assume that
we
are
using
a relay
where the
N 2
unit has
a 0-4 ohm forward
offset
range.
It
is obvious
that with
a
full four
ohm offset, the
overlap with
the H 1 unit
reach set
at 8.83
will
be ample. Set the
M,
rit
to reach
approximately
150
percent
of
the protected line
section
with zero
infeed at the
remote
bus
again
taking
into
account the
difference
in line
ano 1 e with maximum
torque
angle. The M 2 reach
at
its
angle
c airnur torque
will
then be
Reach
(N
)
1.5(9.6)
14.62
/75°
2
cus 10°
8

GEK-26437
The
approximit.e
diaiieter
of
the
M
cheracteristic
will
then
he
this
redch
minus
the
four
ohms
offset
at
75
degrees
or
Z
(M 2 )
= 14.6? -
4.0
10.E?
Again
using
the
three
ohm
basic
minimum
reach the
M 2
tap
setting
will
be
TAP
(M 2 )
10.62
=
281
This
calculation
of
the
setting
of M
2
is
not
n
exact solution
but
may
be
close
enough
for
all
prac
tical
purposes
since
it
is
the
setting
on
overreaching
second zone
characteristic.
The
smaller
the
angular
difference
between
the
line
and
the
relay
angle
of
maximum
torque, the
smaller
the
error
in
the
reach.
Conversely
time
larger
the
amount of
forward
offset that
is
used for
M 2 ,
provided
there
is
an
angular
dif
ference,
the
greater
the
error.
To
check
the
calculitions
it
is
always
best
to
use
an
R-X
diagram
and
plot
the
line
and
the
relay
characteristics
to
scale
to
check
the
application.
This
has
been
done
in
Fig.
4
for
the
sample
calculations
just
described.
The
various
characteristics
and
points
shown
are
as
follows:
OA
protected
line
DC
=
90
percent
of
protected
line
08
=
150
percent
of
protected
line
OF
=
reach
at
75
degrees
E
=
center of
M 1
characteristic
00
M 2
forward
offset
at
75
degrees
OH
=
M 2
reach
or
diameter
at
75
degrees
0 =
center
of
M 2
characteristic
The
optimum
settings
to
provide
the
narrowest
combined
relay
characteristic
would
be
to
have
equal
diameters
for
M 1
and
M
with the
overlap
kept
to
the
minimum
reconmmended
20
percent.
This
may
not
always
be
practical
or
feasibie
and
a judicious
compromise
may
be
advisable
to
take full
advantage
of
other
fea
tures
such
as
the
first
zone
backup
feature.
ihenever
the
reverse
offset of
the
M 1
first
zone
unit
is
used, the
forward
reach
setting
of
the
M 1
unit
is
undisturbed.
This
offset
is
used in
a
situation
as
described
under
APPLICATION.
Since
the
offset
voltage supplied
by
the
tra9sactor
is
inserted
in
the
M 1
polarizing
circuit
only,
the
forward
reach
of
the
unit
into t’ie
protected
line
remains unchanged.
The
tap
setting
used on
the
target and
seal-in
unit
is
determined
by
the
current
drawn
by
the
trip
coil.
The
0.6
ampere
tap
is
used
with
trip
coils which
operate
on
currents
ranging
from
0.6
amperes
to
2.0
amperes
at
the
minimum
control
voltage
while
the 2.0
amperes
tap
should
be
used
when
trip
currents
are
greater
than
2.0
amperes.
It
is
not
good
practice
to
use
the
0.6
ampere
tap
when
the
trip
current
is
greater
than
2.0
amperes
since
the 0.6
ohm
resistance
of
the
O.
ampere
tap
will
cause
an
unnecessarily
high
voltage
drop
which
will
reduce
the
voltage
of
the
circuit
breaker
trip
coil.
If
the
tripping current
should
exceed
30
amperes,
it
is
recommended
that
an
auxiliary
tripping
relay
be
used.
OPERATING
PRINCIPLES
The
eho
units
of
the
GCYB1
relay
are
all
of the
four
pole
induction
cylinder
construction
in
which
torque
is
produced
by
the
interaction
between
a
oolarizinq
flux
and
fluxes
proportional
to
the
restraining
or
operating
quantities.
The
method
of
obtaining
the
mho
characteristic
for
the
N 1
unit
differs
from
that
used
for
th’
N 2 .
Both
schemes
are
described
below.
N 1
Unit
The
schematic
connections
of
the
M 1
unit are
shnwn
in
Fig.
3.
The
two
side
poles,
enerqized
by
phase—
to-phase
voltage,
produce
the
polarizing
flux. The
flux
froim
the
front
and
rear
poles,
energized
by
the
difference
between
-the
secondary
vol
taqe
of
transactor
TR-l 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:
9

GEK-26437
Torcue
KE
(IZT1
-
TE)
cos
p
(1)
where
E
= phase—to-phase
voltage
(F 12 )
I
delta current
(‘11
- 12)
ZT 1
= transfer
impedance
of
transactor
TR-l
(design
constant)
p
= angle
between
E and
(1Z 11
- E)
K
= design
constant
T
= auto-transformer
tap
setting
That
this
equation
(1) defines
a
mho characteristic
can be shown
graphically
by
means of Fig.
5.
The
vector
IZT1
at an
angle
9 determines
the
basic minimum
reach of
the
unit
for a particular
tap setting
of the
transactor
TR-l primary.
Assuming
finite
values of
E
and (IZT1
- TE),
the
balance
point,
torque
=
0,
will
occur
where
cos
P
=
0, that
is
where the angle
P
is
90 degrees.
The
locus
of
the terminus
of vector
TE
(point A
in Fig. 5)
which
will
cause the
angle
p
to
always
be
90 degrees
is
a
circle
passing through
the
origin and
with
the
vector
IZT1
as
a
diameter.
Considering
further
the
diagram
in Fig. 4,
we note that
the angle
P
is less
than
90
degrees
for
an
internal
fault (point
C) and
the
net torque
will
be
in
the closing
direction
(cos
p
is positive);
and
that
the
angle
p
is
greater
than 90
degrees for
an
external
fault (point
0) and
the net torque
will
be
in
the
.pning
direction
(cos
P
is negative).
M 2
Unit
The schematic
connections
of the M 2
unit
are shown
in Fig.
3. The two
side
poles, energized
by
phase—
to-phase
voltage,
produce the
polarizing
flux. The
flux in the
front pole,
which
is
energized
by
a
percent
age of
the
same
phase—to-phase
voltage,
interacts with
the
polarizing
flux to produce
restraint
torque.
The
flux
in
the
rear
poTe, which
is energized
by
the
two
line
currents
associated
with
the same
phase-to—phase
voltage,
interacts
with
the
polarizing
flux
to
produce operating torque.
The torque
at the
balance
point of the
unit
can
therefore
be expressed
by
the following
equation:
Torque
0
= El cos
(0
- 9)
-
KE 2
(2)
where:
E
= phase-to—phase
voltage
(F 12 )
I
= delta
current
(11—12)
9 angle
of maximum
torque
of
the
unit
0
= power
factor
angle of fault
impedance
K
= design
constant.
To prove that
equation
(2)
defines
a
mho characteristic
divide both
sides
by
F 2 and
transpose.
The
equation
reduces
to:
3-cos
(0
- 0)
= K
or:
Y cos
(0
- 9)
= K
(3)
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
‘ mit
pedance
Characteristic
Th impedance
characteristic
of the unit
is
shown in Fig.
5
for the
0.75
ohm
basic minimun
reach
settinG
at a maxiMum
torque angle of
-75
degrees.
This
characteristic
is
obtained
with
the
terminal
voltage
o
tne relay
supplied
directly
to the restraint
circ.,t of
the
M 1 unit,
that is
with
the M 1
taps on the
ajtc-transforrer
tao
block set
at
100
percent.
This circular
impedance
characteristic
can
be enlarged,
tmit
i
unit
redh
increased,
by up
to
10/1
by reducing
the
percentage
of the
terminal
voltage
supolied
Er the

bEK-26437
rstrai
ni.
circuit
by
inean
of
the
M 1
taps
on
the
autotransfornier
tap
block,
and
the
circle can
be
further
enlarged,
providing
a
total
range
adjustment
of
up
to
40/1,
by
means
of the
basic
minimum
reach
tap
screws.
The
circle
will
always
piS;
through
the
origin
and
have
a
diameter
alonn
thp
Th
dpnr’
impedance
line
equal
i
the
ohwc reach
of the
unit
as
expressed
by
the
following
equation.
Ohmic
Reach
(Input
Tar)
mjn
(4)
M 1
Tap
Setting
()
who
re:
Input
Tap
= Input
Tap
Sctting
in
percent
(normally
100%).
=
Basic
minimum
phase—to—neutral
ohmic
reach of the
unit
(as
set
by
taps).
The
angle
of
maximum
torque
of
the
unit
can
be
adjusted
down
to
60
degrees
with
negligible
effect
on
the
reach of
the
unit.
Underreach
At
reduced
voltage
the
ohmic
value
at
which
the
M 1
unit
will
operate
may
be
somewhat
lower
than
the
calculated
value.
This
pullback
or
reduction
in
reach
is
shown
in
Fig.
7
for
the
0.75,
1.5, and
3 ohm
basic
minimum
reach
settings.
The
unit
reach in
percent
of
setting
is
plotted
against
the
three-ph.se
fault
current
for
three
ohmic
reach
tap
settings.
Note that
the
fault
current
scale
changes
with
t
basic mini
mum
reach
setting.
The
M 1
unit
will
operate
for
all
points
to
the
right
of
the
curve.
The
steady-state
curves
of
Fig.
1
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
the
fault
was
applied.
Memory
Action
The dynamic
curves
of
Fig.
7
illustrate
the
effect
of
memory
action
in
the
M 1
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
tie
M 1
unit
to
operate
for
low
fault
currents.
This
can
be
most
forcefully
illustrated
for
a zero voltage
fault by
referring
to
Fig.
7.
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.
7
shows
that
the
M 1
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.
7
shows
that an M
1
unit
with
a
3
ohm
basic
minimum
reach
and
100
percent
tap
setting
will
operate
if
I
is
greater
than
1.5
amperes.
For
an
M 1
unit
with
a
15
ohm
basic
minimum
reach
and
100
percent
tap
seti’ng,
the
unit
will operate
if
130
is
greater
than
0.3
amperes.
Transient
Overreach
The
operation
of
the
M 1
unit
under
transient
conditions
at
the
inception
of
a
fault
is
important
because
the
relay
is
normally connected
so
that the
M 1
contacts
will trip
a
circuit breaker
independently
of
any
other
contacts.
The
impedance
characteristic
of
Fig.
5
and
the
steady—sate
curves
of
Fig.
7
represent
steady-state
conditions.
If
the
fault
current
contains
a
d-c
transient,
the
unit
may close
its
contacts
momentarily ever
thougr
the
impedance
being measured
is
slightly
greater
than
the
calculated
steady-state
reach.
This
overreaching
tendency will
be
a
maximum
when
a
fault
occurs
at
the
one
instant
in
either
half-
cycle wich
produces
the
maximum
d-c
offset
of the
current wave.
The
maximum
transient
overreach
of
the
M 1
unit
will
not exceed
5
percent of
the
steady-state
reach for line
angles
up
to
85
degrees.
Operating
Time
The
operating
tine
of
the
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
reld)
voltage
prior
to the
fault.
The
curves
in
Fig.
8
are
for
the
condition
of
rated
volts
prior
to
the
filt. Time curves
are
given
for
four
ratios of
fault
impedance
to
relay
reach setting.
In
all
cases,
the
M 1
taps
were
in
toe
100
percent
position
and
the
angle
of
maximum
torque
was
set
at
60
degrees
lag.
For
relass
that
were
set
for
an
angle
of
maxinum
torque
of
75
degrees
lag, the
time
curve
would
be
approximately
3-4
percent faster
than
that
shown in
Figure
8.
The
130
fault current
amperes
should be
divided by
five
for
the
one-ampere rated
relays.
11

GEK—26437
M 2 Unit
Impedanse
Fh•acteristic
The
impedance
characteristic
of the
M 2
unit
is shown
in
Fig.
6
for
the
one
ohm
basic
minimum
reach
settin:
at
a
maximum
torque angle
of 60
derees.
As with
the
M 1 unit,
this
circle
can
he
expanded
by
uiearis
of
tne
M 2
taps
on
the
autotransformer
tap block
providing
a range
of
up to
10/1,
or
by
changing the
basic
minimum
reach
of
the
unit
by means
of the
links
on
the
rear
of the
M 2
subassembly
providing
a
total
range
of
up
to
30/1.
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:
Ohmic
Reach
=
(Input
Tap)
(5)
M 2 Tap Setting
(%)
where:
Zmin
=
basic
mm.
phase-to—neutral
ohmic
reach
of the
unit.
Input
Tap
input
tap
setting
in
percent
(normally
100%)
Underreach
The
reduction
in reach of
the
M 2 unit
at
reduced
voltage
is
shown
in
Fig.
g
for
the
1, 2,
and
3
ohm
basic
minimum
reach
settings.
The
reach
in percent
of setting
is plotted against
three-phase
fault
current
for three
ohmic
reach tap
settings.
Note
that
a
different
fault
current
scale
is
shown
for
each
basic
minimum
reach
setting.
The
M 2
unit
will
operate for
all
points
to
the
right
of
the
curve.
The data
for
these
curves
was
taken
in
the same
manner as
the
M 1
curves
previously
described.
Memory
Action
As
shown
by
the
dynamic
curves
of
Fig.
9
the
M 2
unit
has
a
built-in
memory
action
feature
similar
to
that
of
the
M 1
unit
previously
described.
Transient
Overreach
Since
the
M 2
unit
is used
to
trip
the
circuit
breaker
through
the
contacts
of a
timing
relay,
or
as
the
directional
unit
in
a
carrier-current
relaying
scheme,
it
is
not
necessary
to
control
the
transient
overreach
as
was
done
in
the
M 1
unit.
The
M 2
unit
will
have
correct
directional
action
during
transient
conditions.
Operating
Time
The
operating
time
of the
M 2
unit
is
determined
by
the
same
factors
described
for
the
M 1
unit.
The
curves
in
Fig,
10
are
for
the
condition
of
rated
volts
prior
to
the
fault.
Since
the
transient
overreach
is
not
limited
the
M 2
unit
tends
to
be
faster
than
the
M 1
unit.
For a
unit
that
is
calibrated
for
an
angle
of
maximum
torque of
15
degrees
lag
the
operating
times
will
be
approximately
3-4
percent
faster
than
that
shown
in
Fig.
10.
The
13
currents
must
be
divided
by
five
for the
one
ampere
rated
relays.
The
overall
impedance
characteris!ics
of
the
12GCY51F(—)A
relay
are
shown
in
Fig.
11
which
includes
the
offset
chracteristic.
CONSTRUCT
ION
La
so
Th
Type
GCY5
relays
are
assembled
in
the
standard
large
size,
double-end
(L2)
drawout
case
havnc
studs
at
both
ends in
the
rear
for external
connections.
The
electrical
connections
between
tne
relay
units
ant;
the
case
studs
are
made
through
stationary
molded
inner
and
outer
blocks
between
which
nests
a
re
movable
connecting
plug
which
completes
the
circuits.
The
outer
blocks
attached
to
the
case
have
the studs
fDr
tie
external connections,
and
the
inner
blocks
have
the
terminals
for
the
internal
connections.
iery
circuit
in
the
drawout
case
has
an
auxiliary
brush,
as
shown
in
Fig.
12,
to
provide
adequate
.‘nn
roe
connecting
plug
is
withdrawn
or
inserted.
Some
circuits
are equipped
with
shortin’
bars
nterra connc:tions
in
Fig.
13)
and
on
those
circuits,
it
is
especially
important
that
the
auxiliary
:rs
je:
:sntact
as
indicated
in
Fig.
12
with
adequate
pressure
to
prevent
the
openng
of
important
12

GLK—26437
The
relay mechan i sin
is niouritod
in a s tee
framework
ca led the
cradle
and
is
a coinpi
ate unit
w ti
a
1
leads terminated
at the inner block.
This
cradle is
heir 1
firmly
in the
case wit 1
a
latch
at
both
top and
bottom
and by a
guide pin at
the back of the case.
The connecting nlug,
besides
maKing
tne electrical
con
nections
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
aeinu1y.
The
relay case
is
suitable
for either semi-flush
or
surface mounting
on
all panels
up
to
two
inches
thick
and
appropriate
nardware is
available. Hoae.er,
panel thickness
must be indicated
on
the
relay
order
to insure teat
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 fro,n
its own
source
of current
and
voltage,
or from
other sources.
Or the relay
can be
drawn
out
and
replaced
by another
which
has
been tested
in
the laboratory.
Figs.
1
and
2
shown
the relay
removed from
its drawout case
with all major
components
identifi-.
Symbols
used to identify
circuit
components
are the
same
as those which
appear on the
internal
connection
diagram
in Fig. 13.
The
relay includes
major
subassembly
elements:
The
lower element includes
the
M 1
unit
with associated
circuit
components.
Adjustable
reactor
X 1
, used
in setting
angle of maximum
torque,
and rheostat
R 11 , used
in setting basic
minimum
reach
can
be
adjusted from
the
front
of
the
relay. Transactor
Tfl-l
, with
tap block for
selecting the
basic
minimum
reach of
M 1
, is
mounted
on the
rear
of
the
element with
tap
screws accessible from
the
front.
2.
The
middle
element
includes
the N 2
unit
with
its
associated
circuit
components.
Rheostats
R 12
for
setting
basic minimum reach
and
R 22
for setting
angle of
maximum
torque
are
accessible
from
tFie
front of
the
relay. A
terminal
block
with links
for
selecting
the
basic minimum
reach
is
mounted
at
the rear
of
the
element.
GENERAL
ELECTRICAL
TESTS
DRAWOUT RELAYS
GENERAL
Since all drawout
relays in
service
operate
in their cases, it
is recommended
tha.. they
be tested in
their
cases or an equivalent
steel case.
In
this
way
any magnetic effects of
the enclosure
will
be
accurately
duplicated during testing.
A
relay may be tested
without removing
it from
the
panel by
using
a
12XLA13A
test plug. This plug
makes
connections
only
with the relay and does
not
disturb
any
shorting
bars
in
the
case.
Of course,
the
12XLA1?A
test plug may also
be used. Although
this
test plug
allows
greater
testing
flexibility, it
also requires
shorting jumpers
and
the
exercise
of greater
care since
connections
are
made to
both
the relay
and the
external circuitry.
POWER REQUIREMENTS
GENERAL
All
alternating
current
operated devices
are affected
by
frequency. Since
non-sinusoidal waveforms
can
be
analyzed as
a
fundamental
frequency plus
harmonics of the
fundamental frequency,
it follows
that
alternating
current devices (relays)
will
be
affected
by the applied waveform.
Therefore,
in
order
to properly test
alternating
current
relays
it
is essential to
use a sine
wave
of current
and/or
voltage.
The purity of the
sine wave (i.e. its freedom
from harmonics)
cannot be
expressed
as a finite number
for
any
particular
relay, however, any
relay using tuned circuits,
R-L or RC
networks,
or saturating
electromagnets
(such
as
time-overcurrent
relays) wou’d be
essentially
affected by
non-sinusoidal
wave forms.
Similarly,
relays requiring
d-c control
power
should
be tested
using d-c
and not
full wave rectified
power.
Unless
the
rectified
uppiy
is well filtered,
many relays will not
operate properly
due
to
the
dips
in tie rectified
power. Zoner
diodes,
for example, can
turn of
during
these
dips,
As
a
general rule
the
d-c
source
should
not contain
more
than 5 percent ripple.
RECEIVING,
HANDLING AND STORAGE
most
relays,
when miot
included
as a
part of a control tanel
, will he shipped in
cartons designed to
protect trier” against
damage. Irnediately
upon
receipt of a
relay,
examine it for any
damage substained in
transit.
If injury or damage resulting
from
rough
handling
is
evident, file
a
damage
claim
at
once
with
t
transportation compaly
and
promptly
notify
the neareast General
Electric Apparatus Sales
Office.
Reasonable
sare
s:cijld
be
exercised in unpacking
the relay
in
order that none
of the parts are injured
or
the
ddjustrnentc
disturbed.

GEK-26437
relays
are
not
to
be
installed
inediate1y,
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
inside
when the
cover
Is
removed
and
cause
trouble
in
the
operation
of
the
relay.
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
In
view
of
the
vital
role
of
protective
relays
in
the
operation
of
a
power
system
it
is
important
that
a periodic
test
program
be
followed.
It
is
recognized
that
the
interval
between
periodic
checks
rIll
vary
depending
upon
environment,
type
of
relay
and
the
users experience
with
periodic
testing.
Until the
user
has
accumulated
enougi
experience
to
select
the
test
interval
best
suited
to
his individual
requirements
It
is
suggested
that
the
points
listed
under INSTALLATION
PROCEDURE
be
checked
at
an
interval
of
from
one
to
two
years.
CONTACT
CLEANING
For
cleaning
relay
contacts,
a
flexible
burnishing
tool
should
be
used.
This
consists
of
a
flexible
strip
of
metal
with
an
etched-roughened
surface
resembling
in
effect
a
superfine
file.
The
polishing
action
is
so
delicate
that
no
scratches
are
left,
yet
It
will
clean
off any
corrosion
throughly
and
rapidly.
Its
flexibility
insures
the
cleaning
of
the
actual points
of
contact.
Do
not use
knives,
files,
abrasive
paper
or
cloth
of
any
kind to
clean
relay
contacts.
MECHANICAL
INSPECTION
1.
It
is
reconimended
that
the
mechanical
adjustments
in
Table XII,
be
checked.
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
units
must
be
open.
The
moving
contacts
of
the
N 1
and
N 2
units
should rest
against
the
backstop.
5.
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.
TABLE
XII
CHECK
POINTS
N 1
UNIT
M 2
UNIT
Cup
End
Play
0.010”
-
0.015”
0.010”
- 0.015”
Conzact
Gap
0.030”
—
0.035” 0.018”
- 0.022”
Contact
Wipe
0.003”
-
0.005”
0.003”
- 0.005”
Clutch
Gram
Pressure
45
-
60 45
- 60
Check
the
location
of
the
contact
fingers
and
brushes
on
the
cradle
and
case
blocks
against
the
internal
connections
diagram
for
the
relay
(Fig.
13).
SERVICING
The
relay
should
be
level
in
its
upright position
and
should
be
tested
in
its
case
or
an
equivalent
test
case.
Connect
the
relay
for
the
tests
connections
shown
in
Fig. 14.
CONNECT
LEAD
STUDS
A
15
-
17
- 19
B
16-18-20
C
3
D
10
Jumper
studs
4 to
5,
6
to
7
and
8
to
9.
Set
the
relay
taps
for
the
following
conditions.
12GCY51F1A
12GCV51F2A
N 1
reach
taps
1.5
ohms
7.5
ohms
N 2
reach
taps
(A
+
B
links)
0
- 2
0
-
10
Ml
offset
taps
out out
offset
taps
0
0
M 1
restraint
transf.
lOO
lO0
M 2
restraint
transf.
1OO 1O0’
14

i.j:;Jl/
12h
volts,
iI1fCr5 et
dt
Adjust the
pnds
shi
fter
for
an
anj
1
e
sor.ti
rig
of
75
IcOrCes
1
ag
I
1 age
Preheat the
relay
at
rated voltage,
zero
current
‘nroximately
fifteen
minutes
before
attempting
to
perform any
cal
ibratiori
checks or
adjustments.
Control
Spring
Adjustment
Reduce the
voltage to
the value
listed
in
Table XIII,
increase
the
current
until the
unit contacts
close.
This should occur between the
values
of
rest current listed
in
Table XIII.
TABLE XIII
UNIT
i3ASIC MINIMUM
Ø
METER
TEST
TEST
REACH
0-N
TAP
SETTING VOL1AGE
CURRENT
1.5
ohms
750
lag 2.0
V 2.7
-
3.3A
M 1
7.5
ohms
750
lag
2.0
V 0,54 -
0.66
M 2
2.0
ohms
75°
lag
2.0
V
2.0
-
2.54
N 2 10.0
ohms
750
lag 2.0
V
0.40
-
0.54
•
Adjust
the
control spring
on
each unit
if
necessary
to
obtain
contact
closing
between
tee
test
current
limits in
Table
XIII.
Clutch
Checks
The
clutch
adjustments
can
be
made
using a
special
wrench,
0246A7916 and
a
standard
3/8
inch
open
end
wrench.
The
special
wrench
is
inserted
into
the
unit
between
the
top
of
the
front
coils
and
the
contact
head.
The
wrench
should
engage
the
Bakelite
part
just
above
the
cup.
This will
keep
the
cup
assembly
from
turning
while
adjusting
the
clutch.
With
the
special
wrench
holding the
cup
assembly
secure,
the
open
end
wrench
is
used to
tighten
or
loosen
the
self
locking
nut
located
at
the
top
of the
cup
shaft.
Turning
this
nut
clockwise
will
tighten
the
clutch
and
increase
the
clutch
setting.
Turning
counterclockwise
will
decrease
the
clutch
setting.
To
determine
the
proper
setting
of
the
clutch,
the following
relay settings
must
be
made.
RELAY
RESTRAINT
Ml
UNIT
M2
UNIT
OFF3ET
MODEL
LEADS
12GCY51F1A
3
ohm
taps
3
ohio
taps
0
N
unit
siort
or
J2GEY51F2A
15
ohm
taps
15
ohm
taps
0
N 2
unit
open
Clutch-Electrical
Tests
METER
CLUTCH SLIP
CURRENT
VOLTAGE
UNIT
SETTING
12GEYS1F1A
12GCY51F2A
l
75° Lag
120
26-45
Amp 5-9
Amp
j
N 2
750
Lag
120
35-55
Amp
7-il
Amp

GEK-26437
Basic
Minimum
Reach
Tests
Set
the
following:
UNIT
12GCY51F1A
12GCY51F2A
N 1
restraint
taps
100%
100%
N 1
reach
taps 1.5
ohm
7,5
ohm
M 1
offset
tap
0
0
M 2
restraint
taps
100% 100%
M 2
reach
taps
2
ohm
10
ohm
N 2
offset
0
0
The
test
circuit
connects the
relay
for a
phase-to—phase
fault
condition.
Therefore,
the
relay
will
reach
twice
the
basic
minmurn
0
-
N
reach
tap
setting.
TABLE
XIV
T
RELAY
UNIT
METER
SET
PICKUP
REACH
ADJUST
I
MODEL
SETTING
VOLTAGE
CURRENT
0
-
0
12GCY51F1A
M 1
75°
Lag
45V
14.7
-15.3
3
Ohms
R 11
M 2
75°
Lag
60V
14.7 -15.3
4
Ohms
R 12
12GCY51F?A
M 1 75°
Lag
45V
2.94—
3.06
15
Ohms
R 11
N 2
75°
Lag
6OV
2.94-
3.06
20
Ohms
R 12
Angle of
Maximum
Torque
Check
pickup
currents
at
the
angles
indicated
in
Table
XV
to
deteniiine
if
the
angle of
maximum
torque
is
within
limits.
TABLE
XV
TEST
SET
PICKUP
ADJUST
RELAY
MODEL
UNIT
ANGLES
VOLTAGE
CURRENT
12GCYSIFIA
N 1
600
and
90°
45V
16.80-17.84
X 11
M 2
600
and
90°
60V
16.80-17.84
R 22
12GCYS1F2A
N 1
600
and
90°
45V
3.36-
3.57
X 11
I
N 2
600
and
900
6OV
3.36-
3.57
R 22
Reach
Tap
Check
Trie
remaining
reach
taps on
each
unit
can
be
checked
similar
to
the
reach
test
mentioned
previously
ex
cept
use
the
value
in
Table
XVI.
TABLE
XVI
REACH
‘C
METER
PICKUP
MODEL
UNIT
VOLTAGE
TAP
SETTING
CURRENT
1?5lFlA
I
M 1
0.75
75°
Lag
30V
19.2
-20.8
N 2
3.00
75°
Lag
60V
9.6
—10.4
3.75
75° Lag
30V
3.84-
4.16
15.00
75°
Lag
12OV
3.84—
4.16
lb

Lr’ h4/
M]-M?
Ott
ct
S[t ite
ret
ay tnt)’
bick
to tilu’,’
fl(fl
I
n,tenj
unici
i.rie
B;’
FI.INJAIjM
REA1O
TEST
sec,ion
eic
.‘
oFI’Mt
link
to the
tin
ic,,
1. on
‘
‘
urii
t offset
tap at
ohms
(OCYS1F1A)
, 20
ohms (1CY51F24 1
App1 y
I
20
vol
t
1
iinpirc
rJ
e
t t[ctc
Ise
angl
r
meter
tO read
255
degrees
lag
Reduce
the
vol
taqe
and
current
to
that ii
‘ted
in
Table
XVI
I
TABLE
XVII
RElAY
MODEL
OFFSET
CURRENT
l?GCY5IF1A
M 1
2550
Lag
“IN’
20V
17.0
-23.0
N 2
75°
Lag
4L
l2OV
9 -114
3E2 12OV
10.8
-Li.2A
2!l
60V
6.75-
8.254
1
60V 9—114
60V
14.7 -15.3A
I2GCY51F2A
M 1
255°
Lag
“IN”
20V
3.4
- 4.1
N 2
750
Lag
2O1
12OV
1.8
- 2.2A
15
l2OV
2.16-
2.644
lO
120V
2.7
- 3.34
5c2
l2OV
3.6
- 4.4A
0
c
60V
2.94- 3.06
TARGET/SEAL—
IN
The
target
seal-in
unit
has an
operating coil
tapped
at
0.6
or 2.0
amperes.
The
relay
is shipped
froo
the
factory
with
the tap
screw
in the
2.0
ampere
position.
The oPerating
point
of the
seal-in
unit
can
be
checked
by connecting
from
a
d-c
source
(+)
to
stud 11
of the
relay
and from
stud
1 through
an
adjustable
resistor
and ammeter back
to
(-).
Connect
a jumper
from
stud
13
to stud
1 also
so
that the
seal—in
contact
will
protect
the
unit
contact.
Then
close
the
M contact
by
hand
and
increase
the
d—c
current
until
the
seal-in
unit
operates.
It should
pick
up
at tap
value
or sliohtly
lower.
Do
not
attempt
to
interrupt
the
d-c
current
by
means
of
the
M 1
contact.
If
it
is necessary
to change
the tap
setting
of
the target
seal—in
unit
from
0.6
to
2
amps,
or
vice-
versa,
observe the
following procedure.
Assuming
the tao
is
being
changed
from
0.6
to
24,
remove one
of
the
screws
from
the
1eft-hand
contact
strip
and insert
it
into the
2A
position
in
the
right-hand
strip,
being
sure that
it is
securely
tightened.
Then
remove
the
screw
from
the 0.64
position
and
insert
it
in
the
vacant
hole
in the
left-hand
strip.
This
procedure
insures
that
the
contact
adjustment
of
the unit
will
not
be
disturbed
while
the tap
setting
is being
changed.
INSTALLATION
PROCEDURE
LOCATION
The
location
of
the relay
should
be clean
and
dry, free
from
dust,
excessive
heat and
vibration,
and
should
be well
lighted
to
facilitate
inspection
and testing.
MOUNTING
The relay
should
be mounted
on
a
vertical
surface.
The
outline
and
panel
drillinc
dimensions
are
shown
in
Fig.
15.
Connections
The electrical
connections are
made
to
the
relay
by
studs provided
at
the
rear
of the
case.
An
ele
mentary diagram of
typical
external
connections
is
shown
n Figs.
l6A
and 16B.
Reach
settings
other
than the
basic
minimum
reach can
be set
by
reducing the
restraint
transftriser
taD
settings.
The
reach
with
reduced
transformer
settings
can
be deteririned
Sy
the
following
equation.
17

GEK-26437
Zreiay
transf.seJng
x2
Z
(basic
reach
p-N)
Transf.
setting
(Z)
=
Z
(desired)
x
2
Z (basic
reach
a-N)
Knowing
the
relay
reach
as
calculated
an
electrical
test
should
be
performed
in
order
to
determine
if
the
transformer
setting
is correct.
1.
Connect
the
relay
per
Fig.
14.
2. Set
the
phase
angle
meter
for
75
degrees
lag.
3.
Determine
the
current
to
operate
the
unit for
the
Z
setting
0-0
of
the
relay
by
using
the following
equations.
Voltage
@
75°
lag
(+)
1%
Check
one
additional
point
to
determine
if
the
angle of
maximum
torque
is
correct
by
checking
a
pickup
30
degrees
off
the
angle
of
maximum
torque.
=
Voltage
aPPli 3 g)
@
45°
or
105°
lag
(+)
3%
Refer to
the
section
on
SERVICING
if
any
adjustments
must
be made
to
the relay.
Before
any
adjustments
are
made
to
the
relay
with
a
transformer
setting
other
than
100
percent,
the
basic
unit
must
be
checked
first
for
the
basic
minimum
tap used.
RENEWAL
PARTS
It
is
recon1)erlded
that
sufficient
quantities
of
renewal
parts
be
carried
in
5tock
to
enable
the
prompt
replacement
of
any
that
are
worn,
broken, or
damaged.
When
ordering
renewal
parts,
address the
nearest
Sales
Office of
the
General
Electric
Company,
specify
quantity
required,
name
of the
part
wanted,
and
the
complete
model
number
of
the
relay
for
which
the
part
is
required.
18

TARGET
SEAL- iNS
R63
GE
K-264
37
M2
OFFSET—
(TR-2)
—
M2
TRANSFORMER
Ml
TRANSFORMER
Ml
UN1T
Ml
REACH
TAPS
FIG.
1
(8042842)
FRONT
VIEW
OF
THE
12
GCY
RELAY
AND
CASE
Ml
M2
R12
R22
M2
UNIT
xli
19

;i—:i4. /
Ml
TARGET
SEAL-
IN
Ml
OFFSET
M2
REACH
TAPS
Ml
TRANSFORMER
I
Ml
UNIT
V:E
OF
THE
12
CCV
RELAY
REMOVED
FROM
CASE
20