GE SLYG81A User manual

INSTRUCTIONS
GEK
-
49813
C
STATIC
,
THREE
-
PHASE
DIRECTIONAL
GROUND
-
DISTANCE
RELAY
TYPE
SLYG
81
A
GENERAL ELECTRIC
Courtesy of NationalSwitchgear.com

GEK
-
49813
CONTENTS
PAGE
DESCRIPTION
APPLICATION
RATINGS
GENERAL
SURGE WITHSTAND
CAPABILITY
POWER
SUPPLY
CONTACTS
TARGET
CHARACTERISTICS
OPERATING
PRINCIPLES
OPERATING
TIME
SENSITIVITY
BURDENS
CIRCUIT
DESCRIPTION
CALCULATION OF
SETTINGS
FIRST
ZONE
RELAY
SETTING
SECOND ZONE
RELAY
SETTING
CONSTRUCTION
RECEIVING
,
HOLDING
AND
STORAGE
ACCEPTANCE TESTS
VISUAL
INSPECTION
MECHANICAL
INSPECTION
CASE
AND
CRADLE
BLOCKS
TARGET
UNIT
TELEPHONE
RELAY
ELECTRICAL TESTS
,
GENERAL
DIELECTRIC
TESTS
DETAILED
TESTING
INSTRUCTIONS
INSTALLATION PROCEDURE
INTRODUCTION
SURGE
GROUND
AND RELAY
CASE
GROUND CONNECTIONS
TEST
PLUGS
INSTALLATION
TESTS
PERIODIC
TESTING
AND
ROUTINE
MAINTENANCE
CONTACTS
ELECTRICAL
TESTS
SERVICING
RENEWAL
PARTS
CAUTION
ADDITIONAL
CAUTION
APPENDIX
I
LIST
OF
FIGURES
3
4
5
5
6
6
6
7
7
7
8
9
9
10
13
13
14
14
16
16
16
16
16
17
17
17
17
18
22
22
22
23
23
24
24
24
24
27
27
27
28
29
Cover
Photo
(
8043551
)
2
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GEK
-
49813
STATIC
,
THREE
-
PHASE
DIRECTIONAL
GROUND
-
DISTANCE
RELAY
TYPE
SLYG
81
A
DESCRIPTION
The
Type
SLYG
81
A
relay
is
a
three
-
phase
,
first
-
or
second
zone
static
ground
-
distance
,
relay
.
It
is
available
with
ratings
of
60
hertz
,
5
amperes
;
50
hertz
,
5
amperes
;
or
50
hertz
,
1
ampere
.
Five
-
ampere
-
rated
relays
are
available
with
continuously
adjustable
ohmic
-
reach
ranges
of
0.1
to
4
ohms
or
0.75
to
30
ohms
.
One
-
ampere
rated
relays
are
available
with
continuously
adjustable
ohmic
-
reach
ranges
of
0.5
to
20
ohms
or
3.75
to
150
ohms
.
DC
power
-
supply
voltages
available
are
48
,
110
,
or
125
.
A
250
volt
rating
is
available
with
an
external
pre
-
regulator
.
Contact
outputs
are
provided
for
tripping
(
two
contacts
,
each
with
target
)
and
there
is
contact
connected
to
positive
for
auxiliary
functions
.
The
relay
is
mounted
in
a
deep
,
large
-
size
,
double
-
ended
drawout
(
L
2
D
)
case
.
The
Type
SLYG
81
A
relay
may
be
used
in
a
"
stepped
distance
"
protection
as
the
first
,
second
or
third
zone
of
ground
protection
.
It
may
also
be
used
as
an
underreaching
or
overreaching
tripping
relay
in
any
of
the
directional
-
comparison
scheme
.
If
the
directional
-
comparison
scheme
uses
ground
-
distance
blocking
relays
,
the
Type
SLYG
82
A
blocking
relay
(
described
in
instruction
book
GEK
-
49814
)
should
be
used
in
the
scheme
to
coordinate
with
the
SLYG
81
A
tripping
relay
.
The
SLYG
81
A
has
a
"
variable
mho
"
characteristic
,
which
provides
an
optimum
accommodation
of
fault
resistance
.
The
functional
block
diagram
is
shown
in
Figure
1
.
The
internal
connections
are
shown
in
Figure
2
and
the
external
connections
are
shown
in
Figure
3
.
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
provide
for
every
possible
contingency
to
he
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
purchaser
'
s
purposes
,
the
matter
should
be
referred
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
Courtesy of NationalSwitchgear.com

GEK
-
49813
APPLICATION
The
SLYG
81
A
utilizes
a
four
-
input
phase
-
angle
comparator
for
ground
-
distance
measurement
for
each
phase
.
The
four
inputs
for
the
phase
-
A
-
to
-
ground
measurement
are
:
(
a
)
OA
-
lo
)
ZRI
+
KOIOZRO
-
TVAG
Operating
Quantity
#
1
Polarizing
Quantity
(
b
)
VRG
Z
90
°
V
3
(
c
)
C
KQIOZRO
~
VQ
.
#
2
Polarizing
Quantity
Overcurrent
Supervision
(
d
)
IQZRO
where
:
is
the
faulted
phase
current
is
the
zero
-
sequence
component
is
the
phase
(
positive
-
and
negative
-
sequence
)
base reach
tap
with
an
impedance
angle
85
°
is
the
neutral
(
zero
-
sequence
)
base reach
with
an
impedance
angle
of
75
°
is
the
"
adjustable
"
phase
-
to
-
ground
restraint
voltage
is
the
"
quadrature
"
voltage
shifted
90
leading
"
A
•
o
ZRI
ZRO
TVAG
VRrZ
90
°
V
3
is
a
ratio
tap
compensate
for
the
magnitude
ratio
between
the
zero
-
and
positive
-
sequence
lines
impedance
is
a
design
constant
(
0.5
per
unit
)
is
the
zero
-
sequence
voltage
atthe
relay
The
use
of
a
four
-
input
comparator
produces
many
advantages
over
previous
designs
in
simplifying
the
application
of
a
ground
-
distance
relay
for
either
first
-
or
second
-
zone
applications
.
The
first
and
second
inputs
(
a
and b
)
to
the
comparator
produce
the
well known
quadrature
-
polarized
ground
-
distance
unit
with
a
"
variable mho
"
characteristic
.
The
"
variable
mho
"
characteristic
increases
in
size
as
the
source
impedance
increases
,
to
accommodate
increasing
fault
resistance
.
The
use
of
the
second
polarizing
quantity
(
c
)
re
*
ricts
the
distance
measurement
to
the
faulted
phase
,
thereby
eliminating
the
need
for
checking
the
unfaulted
phase
unit
for
incorrect
directional
sensing
on
unusual
-
sequence
current
-
distribution
factors
,
or
overreaching
on
heavy
-
load
transfer
.
The
second
polarizing
quantity
(
c
)
also
precludes
the
possibility
of
the
distance
unit
overreaching
on a
double
-
line
-
to
-
ground
fault
with
high
zero
-
sequence
fault
resistance
.
The
high
zero
-
sequence
fault
resistance
can
cause a
fault
beyond
the
reach
of
a
relay
to
appear
within
the
operating
characteristic
of
a
relay
when
only
the
(
a
)
and
(
b
)
inputs
above
are
used
.
K
0
c
Vo
4
Courtesy of NationalSwitchgear.com

GEK
-
49813
The
fourth
input
(
d
)
provides
overcurrent
supervision
to
prevent
operation
on
potential
failure
or
on
the
line
de
-
energizing
transients
that
are
associated
with
lines
with
shunt
reactors
.
The
line
de
-
energizinq
transients
present
a
problem
if
a
relay
operates
on
the
transient
voltages
just
prior
to
a
high
-
speed
reclosure
.
In
addition
,
the
third
and
fourth
inputs
(
c
and
d
)
act
as
a
zero
-
sequence
directional
unit
that
provides
excellent
directional
integrity
.
The
SLYG
81
A
has
an
adjustable
characteristic
that
is
adjusted
by
means
of
the
timer
setting
on
the
characteristic
timer
.
For
short
lines
a
circular
characteristic
is
recommended
,
but
,
for
longer
lines
,
lines
with
unusually
heavy
-
load
transfer
,
or
three
-
terminal
lines
where
very
large
reach
settings
are
applied
,
a
lens
-
shaped
characteristic
is
recommended
.
RATINGS
GENERAL
The
Type
SLYG
81
A
relay
is
designed
for
continuous
operation
in
ambient
temperatures
between
-
20
°
C
and
+
55
°
C
per
ANSI
standard
C
37.90
-
1978
.
In
addition
,
these
relays
will
not
malfunction
nor
be
damaged
if
operated
in
an
ambient
up
to
65
°
C
.
The
current
circuits
of
the
relays
that
are
rated
5
amperes
rms
will
carry
10
amperes
rms
continuously
and
will
carry
250
amperes
rms
for
1
second
.
The
current
circuits
of
the
relays
that
are
rated
1
ampere
rms
will
carry
2
amperes
rms
continuously
and
will
carry
50
amperes
rms
for
1
second
.
The
potential
circuits
are
rated
69
volts
rms
line
-
to
-
neutral
and
can
withstand
110
%
of
this
value
continuously
.
These
relays
are
available
with
either
short
or
long
impedance
ranges
as
shown
in
Table
I
.
TABLE
I
AVAILABLE
REACHES
CURRENT
TRANSFORMER
RATING
ZRI
BASE
REACH
TAP
IN
POSITIVE
-
SEQUENCE
OHMS
ZR
IMPEDANCE
RANGE
IN
POSITIVE
-
SEQUENCE
OHMS
TYPE
0.1
0.1
to
1.0
0.2
to
2.0
0.4
to
4.0
5
AMP
SHORT
0.2
0.4
0.75
0.75
to
7.5
1.5
to
15
3
to
30
5
AMP
LONG
1.5
3.0
0.5
0.5
to
5.0
1.0
to
10.0
2.0
to
20.0
SHORT
1
AMP
1.0
2.0
3.75
3.75
to
37.5
7.5
to
75.0
15.0
to
150.0
1
AMP
LONG
7.5
15.0
5
Courtesy of NationalSwitchgear.com

GEK
-
49813
Selection
of
the desired base
-
reach
tap
(
ZRI
)
is
made
by
means
of
the
four
tap
screws
at
the
lower
rear
of
the
relay
(
see
Figure
4
)
.
All
four
tap
screws
(
0
A
,
0
B
,
0
C
,
and
neutral
)
must
be
in
equal
ohmic
-
tap
positions
.
The
relay
reach
(
ZR
)
of
the
relay
is
continuously
adjustable
,
within
the
range
shown
in
Table
I
for
a
particular
tap
,
by
means
of
a
three
-
gang
precision
potentiometer
at
the
lower
front of
the
relay
(
see
Figure
5
)
.
The
10
-
turn
dial
of
this
potentiometer
is
calibrated
in
percent
restraint
setting
(
T
)
and
is
adjustable
from
10
%
(
fully
counterclockwise
)
to
110
%
(
fully
clockwise
)
.
The
maximum
recommended
setting
is
100
%
.
An
enlarged
picture
of
the
dial
is
shown
in
Figure
15
.
The
relay
reach
is
given
by
equation
(
1
)
:
Relay
Reach
=
ZR
=
100
x
ZRI
(
D
T
where
T
=
Restraint
setting
in
percent
ZR
=
Relay
reach
in
ohms
ZRI
=
Base
reach
tap
in
position
-
sequence
ohms
The
relay
should be
within
5
%
of
the
value
given
by
equation
(
1
)
if
the ambient
temperature
is
within
the
rated
range
of
-
20
°
C
to
+
55
°
C
.
SURGE
-
WITHSTAND
CAPABILITY
These
relays
will
withstand
ANSI C
37.90
A
-
1974
surge
test
without
incorrect
operation
or
damage
to
any
component
.
POWER
SUPPLY
Models
are
available
with
ratings
of
48
'
cits
DC
(
38
to
56
volts
)
,
110
volts
DC
(
88
to
120
volts
)
,
or
125
volts
DC
(
100
to
140
volts
)
.
The
power
supply
contains
a
DC
-
to
-
DC
converter
to
provide
isolation
between
the
DC
input
control
power
and the solid
-
state
circuitry
of
the
relay
.
On
relays
with
DC
control
voltage
in
excess
of
125
volts
,
an
external
pre
-
regulator
is
used
.
This
reduces the
control
voltage
to
125
volts
,
suitable
for
input
to
the
relay
terminals
.
CONTACTS
All
three
of
the
output
contacts
of
the
Type
SLYG
81
A
will
make and
carry
30
amperes
for
tripping
duty
,
but
their
continuous
-
current
ratings
are
limited
by
the
target
ratings
as
listed
in
Table
III
.
The
interrupting
ratings
are
given
in
Table
II
.
6
Courtesy of NationalSwitchgear.com

GEK
-
49813
TABLE
II
INTERRUPTING
RATINGS
OF
OUTPUT
CONTACTS
AMPS
AC
VOLTS
INDUCTIVEtt
NON
-
INDUCTIVE
115
0.75
2.0
230
0.5
1.0
DC
VOLTS
48
1.0
3.0
125
0.5
1.5
250
0.25
0.75
t
+
The
inductive
rating
is
based
on
an
L
/
R
ratio
of
0.04
second
TARGET
Targets
having
0.6
and
2
ampere
taps
are
provided
for
the
output
contacts
between
studs
11
and
12
and
between
studs
13
and
14
.
The
ratings
of
each
of
these
targets
are
qiven
in
Table
III
.
TABLE
III
TARGET
RATINGS
0.6
Amp
Tap
2.0
Amp
Tap
Minimum
Operating
Carry
Continuously
Carry
30
Amps
for
Carry
10
Amps
for
DC
Resistance
60
Hertz
Impedance
0.6
amps
1.2
amps
0.5
sec
.
5
secs
.
0.78
ohm
6.2
ohms
2.0
amps
2.6
amps
3.5
secs
.
30
secs
.
0.18
ohm
0.65
ohm
CHARACTERISTICS
OPERATING
PRINCIPLES
The
mho
characteristic
in
the
SLYG
81
is
obtained
by
converting
relay
currents
into
voltage
signals
(
IZ
)
,
combining
these
IZ
signals
with
signals
proportional
to
the
line
voltage
(
V
)
,
and
measuring
the
angle
between
the
appropriate
combinations
to
obtain
the
desired
characteristic
.
Currents
are
converted
into
IZ
signals
by
means
of
transactors
(
XA
,
XB
,
XC
,
and
Xo
)
that
are
air
gap
reactors
with
secondary
windings
.
The
transactors
are
tapped
on
the
primary
to
provide
the
basic
ohmic
tap
selection
of
0.1
,
0.2
or
0.4
ohms
for
the
5
ampere
short
-
reach
relay
or
0.75
,
1.5
or
3
ohms
for
the
5
ampere
long
-
reach
relay
.
The
1
-
ampere
-
rated
relay
taps
are
0.5
,
1.0
,
or
2.0
ohms
for
the
short
-
reach
relay
and
3.75
,
7.5
and
15
ohms
for
the
long
-
reach
relay
.
7
Courtesy of NationalSwitchgear.com

GEK
-
49813
The
Z
of
the
IZ
quantity
is
the
transfer
impedance
of
the
transactor
and
is
equal
to
VOUT
/
'
IN
-
The
transactor
secondaries
have
loading
resistors
across
them
.
These
resistors
provide
the
desired
angle
between
VOUT
and
IIN
-
This
angle
determines
the
base
reach
of
the
relay
.
Two
additional
quantities
(
"
IOZRO
"
and
"
CKOIOZRO
-
VO
"
)
are
also
compared
to
provide
security
for
faults
other
than
single
-
line
-
to
-
ground
.
The
phase
angle
between
the
four
signals
is
compared
in
a
"
Coincidence
Logic
"
(
CL
)
circuit
that
puts
out
a
rectangular
voltage
pulse
when
these
signals
are
coincident
.
The
width
of
this
block
of
voltage
is
measured
by
an
"
Integrating
Timer
"
(
IT
)
circuit
which
provides
a
trip
-
signal
output
when
the
pulse
width
exceeds
a
preset
duration
.
If
the
timer
is
set
for
90
°
(
that
is
,
4.16
milliseconds
in
a
60
hertz
system
or
5
milliseconds
in
a
50
hertz
system
)
,
a
circular
R
-
X
characteristic
is
obtained
.
If
the
timer
is
set
for
less
than
90
°
,
an
expanded
(
tomato
shaped
)
characteristic
is
obtained
.
If
the
timer
is
set
for
more
than
90
°
,
a
contracted
circle
(
lens
shaped
)
is
obtained
.
Relays
are
shipped
from
the
factory
with
the
timer
set
for
90
°
.
The
timing
diagram
for
a
typical
condition
is
shown
in
Figure
8
.
If
the
100
%
restraint
setting
is
used
and
Kp
is
set
equal
to
the
ratio
of
Zo
'
/
Zi
’
,
phase
-
to
-
neutral
reach
of
the
relay
at
the
angle
0
is
equal
to
the
IZ
base
-
reach
tap
chosen
.
If
a
voltage
tap
other
than
100
%
is
chosen
,
reach
is
increased
in
inverse
proportion
to
the
voltage
tap
.
For
example
,
if
the
50
%
voltage
tap
is
used
,
relay
operation
still
occurs
for
the
same
voltage
applied
to
the
measuring
circuit
,
but
since
the
actual
line
voltage
is
twice
this
amount
,
the
relay
reach
is
twice
as
great
.
Relay
reach
at
the
angle
of
maximum
reach
can
be
calculated
from
the
expression
:
ZR
=
Zfilx
100
T
where
:
T
=
restraint
setting
in
percent
ZRI
=
base
-
reach
tap
setting
in
positive
-
sequence
ohms
ZR
=
relay
-
reach
in
positive
-
sequence
ohms
To
set
the
relay
for
the
desired
reach
,
it
is
necessary
first
to
select
the
proper
"
Base
Reach
Tap
"
.
This
tap
should
be
the
highest
"
Base
Reach
Tap
”
that
is
smaller
than
the
desired
ohmic
reach
.
The
setting
of
the
"
Base
Reach
Tap
"
is
explained
under
the
section
titled
CONSTRUCTION
in
this
book
.
After
the
"
Base
Reach
Tap
"
is
selected
,
the
"
Percent
Restraint
Setting
"
may
now
be
chosen
to
produce
the
required
relay
reach
.
OPERATING
TIME
Operating
time
is
a
function
of
the
length
of
line
being
protected
,
the
source
impedance
and
the
location
of
the
fault
.
Figure
9
shows
the
average
operating
time
for
a
Type
-
SLYG
81
A
relay
when
set
for
first
zone
protection
of
a
typical
100
mile
radial
transmission
line
with
a
source
impedance
equivalent
to
a
25
mile
line
.
Figure
10
shows
the
average
operating
time
for
the
same
line
when
the
relay
is
set
for
second
-
zone
protection
.
8
Courtesy of NationalSwitchgear.com

GEK
-
49813
SENSITIVITY
Sensitivity
is
defined
as
the
steady
-
state
rms
voltage
or
current
(
at
the
relay
terminals
)
required
for
a
particular
quantity
to
pick
up
the
relay
if
all
quantities
are
in
the
optimum
phase
relationship
.
The
nominal
sensitivities
for
the
sign
in
the
SLYG
81
A
relay
are
as
follows
:
Polarizing
#
1
Sensitivity
(
Quadrature
Polarizing
)
Sensitivity
is
10
%
of
rated
voltage
Polarizing
#
2
Sensitivity
Sensitivity
is
1.25
volts
(
-
VQ
+
CKQIOZRO
)
1
.
2
.
3
.
Overcurrent
Supervision
Sensitivity
IOZRO
3
|
0
0.2
—
amperes
FOTZRI
=
3
ohms
,
3
!
Q
=
0.2
ZRI
Operate
Circuit
Sensitivity
4
.
See
Figure
11
for
sensitivity
in
terms
of
V
|
_
N
(
%
T
)
100
To
determine
current
sensitivity
,
the
ratio
of
lo
to
l
0
must
be
known
or
assumed
,
and
the
ratio
of
Zoi
_
to
Zu
_
must
be
known
.
The
current
sensitivity
can
then
be
determined
from
the
formula
:
(
|
0
-
IQ
)
ZRI
+
IQKQZRO
=
0
J
_
6
1
-
X
where
actual
reach
nominal
reach
X
=
For
example
,
if
l
0
=
3
loand
KOZRO
=
3
ZRI
then
2
/
3
l
0
ZRI
+
I
0
ZRI
=
0.16
1
-
X
if
X
=
0.8
,
5
/
3
I
0
ZRI
=
0
J
6
=
0.8
1
-
.
8
For
ZRI
=
3
ohms
,
10
=
0.16
amperes
L
=
0.48
0
ZRI
BURDENS
The
potential
-
circuit
burden
per
phase
at
69
volts
rms
line
-
to
-
neutral
voltage
is
as
follows
:
0.2
volt
-
amperes
0.17
watts
0.10
vars
Q
Courtesy of NationalSwitchgear.com

GEK
-
49813
The
impedance
of
each
current
circuit
,
measured
at
its
rated
current
,
is
shown
in
Table
IV
below
.
The
values
are
given
in
ohms
.
TABLE
IV
5
AMPERE
RATED
RELAY
1
AMPERE
RATED RELAY
PHASE
GROUND
PHASE
GROUND
Z
0.030
0.018
0.210
0.160
0.027
R
0.018
0.200
0.150
0.013
X
0.002
0.065
0.050
The
overall
current
drains
of
the
DC
control
-
power
input
(
Studs
19
and
20
)
are as
follows
:
RATED
VOLTAGE
IN
DC
VOLTS
RELAY K
2
INPUT
CURRENT
IN
MILLIAMPERES
Dropped
Out
Picked
up
Dropped
Out
Picked
Up
Dropped
Out
Picked
Up
Dropped
Out
Picked
Out
48
200
48
315
110
90
110
175
125
80
125
155
250
260
t
260
t
250
t
Input
to
studs
A
and
C
of
external
pre
-
regulator
.
CIRCUIT
DESCRIPTION
The
internal connections
for
the
Type
-
SLYG
81
A
relay
are
shown
in
Figure
2
.
The
terminal
numbers
at
the
top
and
bottom
OT
this
diagram
represent
the
external
connections
to
the
relay
.
The
external connections
can
be
grouped
as
shown
in
Table
V
.
TABLE V
EXTERNAL
CONNECTIONS
TERMINAL
NUMBERS
1
through
8
DESCRIPTIONS
AC Current
Inputs
Contact
(
Other
End
Connected
to
#
19
)
Surge
Ground
Contacts
with
Targets
AC
Potential
Inputs
DC
Control
Power
Input
9
10
11
through
14
15
through
18
19
through
20
10
Courtesy of NationalSwitchgear.com

GEK
-
49813
The
phase
-
to
-
neutral
input
voltages
are
connected
to
the
primaries
of
10
:
1
step
-
down
transformers
(
TA
,
TB
and
TC
)
.
One
secondary
of
these
potential
transformers
is
connected
to
the
signal
processing
(
SP
)
card
as
well
as
to
a
three
-
gang
precision
potentiometer
.
The
voltages
on
the
sliders
of
the
potentiometer
are
also
connected
as
inputs
to
the
SP
card
.
A
second
set
of
secondaries
on
these
potential
transformers
is
connected
in
broken
delta
to
derive
the
Vo
signal
required
as
an
input
to
the
SP
card
.
The
input
phase
currents
pass
through
the
primaries
of
transactors
(
XA
,
XB
and
XC
)
.
These
transactors
produce
secondary
voltages
proportional
to
their
primary
currents
in
magnitude
;
however
,
the
secondary
voltages
lead
their
respective
primary
currents
by
a
phase
angle
of
85
°
.
The
input
zero
-
sequence
current
passes
through
the
primary
of
a
transactor
(
X
0
)
similar
to
XA
,
XB
and
XC
except
that
the
secondary
voltage
of
X
0
leads
its
primary
current
by
75
°
.
The
secondary
voltages
of
all
four
transactors
are
connected
to
the
SP
card
.
The
SP
card
combines
the
above
mentioned
quantities
to
produce
various
output
signals
that
are
then
fed
as
inputs
to
other
cards
.
Table
VI
indicates
the
types
of
output
signals
produced
by
the
SP
card
,
and
which
other
card
are
fed
by
each
signal
.
TABLE
VI
OUTPUTS
FROM
SP
CARD
INPUT
TO
CARD
OUTPUT
SIGNAL
FROM
SP
CARD
Quadrature
Polarizing
(
QP
)
Coincidence
Logic
(
CL
)
VAN
-
VBN
-
VCNI
-
VAN
-
-
VBN
.
-
VCN
CK
0
I
0
ZRO
-
Vo
(
IA
-
IO
)
ZRI
+
KOIOZRO
-
TVAN
(
IB
-
IO
)
ZRI
+
KOIOZRO
-
TVBN
OC
-
IO
)
ZRI
+
KOIOZRO
-
TVCN
Operate
Signal
(
OS
)
The
"
Quadrature
Polarizing
"
(
QP
)
card
produces
a
voltage
VBC
^
90
°
(
j
VBC
)
by
algebraic
summations
of
VBN
and
VCN
-
This
j
VBC
is
then
filtered
in
an
active
band
-
pass
filter
with
a
natural
frequency
(
fo
)
equal
to
system
frequency
.
Similarly
-
filtered
JVCA
and
JVAB
voltages
are
produced
in
the
QP
card
and
all
three
outputs
are
fed
to
the
CL
card
as
the
main
(
1
)
polarizing
voltages
.
The
"
Operate
Signal
"
(
OS
)
card
filters
its
signals
from
the
SP
card
in
active
band
-
pass
filters
with
natural
frequencies
equal
to
system
frequency
.
Circuitry
is
also
provided
to
bypass
this
filtering
for
(
IZ
-
TV
)
signals
of
large
magnitudes
.
The
outputs
of
the
OS
card
are
fed
to
the
CL
card
as
operating
signals
.
Each
phase
of
the
CL
card
has
four
input
signals
and
produces
a
high
logic
(
+
15
volts
DC
)
output
signal
whenever
these
signals
have
the
proper
instantaneous
phase
relationship
.
Table
VII
shows
the
various
input
signals
for
one
phase
and
where
the
signals
are
obtained
.
In
order
for
the
output
of
CL
to
be
nigh
,
inputs
1
,
3
and
4
must
have
the
same
polarity
and
input
2
must
have
an
opposite
polarity
.
11
Courtesy of NationalSwitchgear.com

GEK
-
49813
TABLE
VII
INPUTS
TO
CL
CARD
INPUT
NO
.
INPUT
SIGNAL
DERIVED
FROM
Quadrature
Polarizing
1
OP
Card
2
Operate
Signal
CKOIOZRO
-
Vo
IQZRO
OS
Card
SP
Card
3
4
XQ
Transactor
The
output
of
the
CL
card
has
a
high
logic
value
if
any
one
,
or more
,
of
its
phases
has the
proper
phase
relationship
between
its
input
signals
.
The
CL
card
output
is
fed
to
the
integrating
-
timer
(
IT
)
card
,
which
measures
the
time
that
the
CL
output
signal
is
high
.
If
the
input
signal
to
the
IT
card
is
high
for
4.16
milliseconds
on
a
repetitive
basis
(
50
hertz
relay
-
5.0
milliseconds
) (
or
5.5
milliseconds
on a
single
-
shot
basis
) (
50
hertz
relay
-
6.0
milliseconds
)
,
the
output
of
the
IT
card
will
go
to
a
high
logic
value
,
which
picks
up
a
reed
relay
(
K
1
)
mounted
on
the
power
-
supply
(
PS
)
card
.
A
normally
-
open
contact
on
K
1
energizes
a
telephone
relay
(
K
2
)
mounted
on
the
front
panel
.
Two
normally
-
open
contacts
of
K
2
are
connected
in
series
with
the
coils
of
targets
to
provide
the
main
tripping
contacts
(
terminal
numbers
11
to
12
and
13
to
14
)
.
In
addition
,
a
third
normally
-
open
contact
of
K
2
is
connected
between
terminals
19
and
9
,
without
a
target
,
for
auxiliary
functions
.
The
input
DC
control
power
(
48
,
110
,
or
125
volts
)
is
connected
to
the
power
supply
(
PS
)
card
,
which
contains
a
DC
-
to
-
DC
converter
The
outputs
of
the
DC
-
to
-
DC
converter
are
+
15
and
-
15
volts
DC
regulated
,
which
supply
the
necessary
control
power
to
the other cards
.
The
transformer
in
the
DC
-
to
-
DC
converter
provides
isolation
between
the solid
-
state
circuitry
of
the
relay
and
the
input
DC
control
power
(
i
.
e
.
station
battery
)
.
A
yellow
LED
monitors
the
output
voltage
from
this
iruernal
power
supply
.
The
internal
connections
and
card
layouts
for
each
printed
-
circuit
card
are
listed
in
Table
VIII
.
The
printed
-
circuit
cards have
test
points
accessible
from
the
front
of
the
cards
.
Each
test
point
,
except
the
reference
connection
"
OV
"
on
the
PS
card
,
is
buffered
by
a
resistor
to
prevent
a
disturbance
to
the
circuitry
if
a
test
point
is
accidentally
short
-
circuited
.
The
test
points
are
labeled
functionally
;
i
.
e
.
,
the
A
phase
input
to
the
integrating
timer
is
labeled
"
AIN
"
.
The
internal
connection
drawings
show the
test
points
with
the
same
label
.
12
Courtesy of NationalSwitchgear.com

GEK
-
49813
TABLE
VIII
INTERNAL
CONNECTIONS
FOR
CARDS
FIGURE
NUMBER
OF
CARD
LAYOUT
CARD
FUNCTION
FIGURE
NUMBER
OF
INTERNAL
CONNECTIONS
CARD
DESIGNATION
16
B
Signal
Processing
Quadrature
Polarizing
Operate
Signal
Coincidence
Logic
Integrating
Timer
Power
Supply
{
125
Volts
DC
)
Power
Supply
(
48
Volts
DC
)
Power
Supply
(
110
Volts
DC
)
16
A
SP
17
C
17
A
or
B
18
A
or
B
QP
18
C
OS
19
A
19
B
CL
20
A
20
B
IT
22
21
A
PS
22
21
B
PS
22
21
C
PS
CALCULATION OF
SETTINGS
Assume
that
the
line
to
be
protected
is
approximately
70
miles
long
and
has
primary
impedances
as
follows
:
Zj
=
42
Z
83
°
,
ZQ
=
130
Z
78
°
Assume
CT
ratio
is
1000
/
5
and
PT
ratio
is
2000
/
1
.
1000
1
=
4.2
Z
83
°
Z
.
sec
—
42
l
2000
5
1000
1
=
13
Z
78
°
ZQsec
=
130
5
2000
FIRST
ZONE
RELAY
SETTING
The
first
-
zone
relay
can
be
set
up
to
85
%
of
the
line
impedance
for
positive
-
sequence
impedance
angles
above
75
°
and
80
%
for
positive
-
sequence
impedance
angles
above
70
°
.
For
line
angles
lower
than
70
°
,
refer
to
the
local
GE
Sales
Office
.
Hence
the reach
ZR
=
0.85
(
4.2
)
=
3.57
ohms
.
Select
ZRI
(
phase
base
-
reach
tap
)
.
The
highest
tap
should
be selected
that
is
less
than
ZR
,
which
,
in
this
case
,
is
the
3
ohm
tap
on
the
long
-
reach
relay
.
Select
ZRO
(
neutral
base
-
reach
tap
)
and the
K
0
multiplier
such that
:
(
a
)
(
b
)
<
ZQsec
Zj
sec
13
Courtesy of NationalSwitchgear.com

GEK
-
49813
In
general
,
ZRO
will
equal
ZRI
,
and
hence
the
Ko
tap
(
2.5
,
3.5
,
4
,
4.5
)
will
be
selected
to
be
equal
to
or
slightly
less
than
Zosec
/
Z
1
sec
,
or
,
in
this
case
,
13
/
4.2
=
3.09
;
select
Ko
=
3
.
Select
restraint
setting
(
10
%
to
100
%
)
.
The
restraint
setting
is
obtained
from
the
formula
:
(
c
)
3.0
T
=
(
100
%
)
=
ZR
(
100
)
=
84.0
%
3.57
NOTE
:
SEE
THE
CONSTRUCTION
SECTION
OF
THIS
BOOK
FOR
DETAILS
ON
HOW
TO
OBTAIN
THE
BASE
REACH
TAP
AND
RESTRAINT
SETTING
CALCULATED
IN
THIS
SECTION
.
SECOND
-
ZONE
RELAY
SETTING
The
second
-
zone
relay
is
set
in
the
same
manner
as
the
first
-
zone
relay
except
that
a
different
reach
is
required
.
Assume
that
the
second
-
zone
unit
is
used
in
a
directional
-
comparison
scheme
and
a
reach
of
175
%
is
desired
,
ZR
=
1.75
(
4.2
)
=
7.35
ohms
.
Select
ZRV
Use
3
ohm
base
tap
.
Select
ZRO
and
Ko
-
Use
ZRO
=
3
ohms
and
Ko
=
3
,
the
same
as
the
first
-
zone
relay
.
Restraint
Setting
(
a
)
(
b
)
(
c
)
Z
«
,
3
100
=
(
100
)
=
40.8
%
Zi
7.35
NOTE
:
THE
K
0
ZR
0
SETTING
SHOULD
NOT
BE
GREATER
THAN
TWICE
THE
ZERO
-
SEQUENCE
IMPEDANCE
OF
THE
LINE
.
CONSTRUCTION
The
t
ype
-
SLYG
81
A
relay
is
assembled
in
a
deep
,
large
-
sized
,
double
-
ended
(
L
2
D
)
drawout
case
having
studs
at
both
ends
in
the
rear
for
external
connections
.
The
electrical
connections
between
the
relay
unit
and
the
case
studs
are
through
stationary
molded
inner
and
outer
blocks
,
between
which
nests
a
removable
connecting
plug
that
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
Figure
12
,
to
provide
adequate
overlap
when
the
connecting
plug
is
withdrawn
or
inserted
.
Some
circuits
are
equipped
with
shorting
bars
(
see
internal
connections
in
Figure
2
)
,
and
on
these
circuits
it
is
especially
important
that
the
auxiliary
brush
make
contact
,
as
indicated
in
Figure
12
,
with
adequate
pressure
to
prevent
the
opening
of
important
interlocking
circuits
.
14
Courtesy of NationalSwitchgear.com

GEK
-
49813
The
relay
is
mounted
in
a
steel
framework
called
the
cradle
and
is
a
complete
unit
,
with
all
leads terminated
at
the
inner
blocks
.
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
besides
making
the
electrical
connections
between
the
respective
blocks
of
the
crad
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
semiflush
or
surface
mounting
on
all
panels
up
to
two
inches
(
2
"
)
thick
and
appropriate
hardware
is
available
.
However
,
pane
!
thickness
must
be
indicated
on
the
relay
order
to
make
sure
that
proper
hardware
is
available
.
Outline
and
panel
drilling
is
shown
in
Figure
13
For
DC
supply
voltages
greater
than
125
volts
it
is
necessary
to
use an
external
pre
-
regulator
.
plug
,
le
and
The
pre
-
regulator
is
packaged
in
a
box
made
from
compound
plates
and
perforated
steel
siding
.
It
can
be
mounted
on
the
rear
of
the
relay
or
at
a
convenient
location
near
the
relay
.
The
outline
and
mounting
dimensions
for
the
pre
-
regulator
are
shown
in
Figure
28
.
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
drawn
out
and
replaced
by
another
that has been tested
in
the
laboratory
.
The
potential
transformers
(
TA
,
TB
and
TC
)
and
the
transactors
(
XA
,
XB
,
XC
and
XO
)
are
mounted
at
the
rear
of
the
cradle
as
shown
in
Figure
4
.
The
tap
block
below
the
transactors
is
used
to
set
the
base reach
to
the
value
determined
in
the
CALCULATION
OF
SETTINGS
section
of
this book
.
The
four
leads
tagged
A
the desired ohmic
value
labeled
0
A
,
0
B
,
0
C
and
NEUT
respectively
.
For
example
,
Figure
4
shows
a
base reach
(
ZRI
)
setting
of
0.4
ohms and
the leads
are
connected
as
follows
:
>
position
1
-
+
position
4
-
*
position
7
-
*
position
10
A
base
-
tap
indicator
is
provided
on
the
nameplate
.
The knob should
be rotated
until
the
number
corresponding
to
the
base
-
reach
setting
is
exposed
.
Figure
14
shows
a
front
view
of
the
relay
with
the
nameplate
removed
.
This
view
shows
the
targets
,
the
telephone
relay
and all
adjustments
other
than
the base
-
reach
tap
described above
.
The dial
of
the
restraint
-
setting
potentiometer
(
T
)
is
calibrated
directly
in
percent
with
the
number
in
the
window
indicating
the
10
'
s
digit
and
two
digits
on
the dial
indicating
the
units
and decimal
digits
.
An
example
is
shown
in
Figure
15
with
a
setting
of
84
%
.
The dial
can
be
adjusted
from
10
%
to
110
%
.
The lock
must
de
disengaged
(
by
turning
the
lever
counterclockwise
)
in
order
to
change
the
restraint
setting
,
but
should be
engaged
again
after
the
desired
setting
is
made
.
The
value
of
”
Ko
”
selected
in
the
CALCULATION
OF
SETTINGS
section
is
set
by
means
of
the
K
0
plug
indicated
in
Figure
14
.
This
plug
should
connect
the horizontal
jacks
labeled
”
2.5
"
,
"
3.0
"
,
"
3.5
"
,
"
4.0
"
or
"
4.5
"
on
the
SP
card
to
obtain
a
K
0
value
of
2.5
,
3.0
,
4.0
or
4.5
respectively
.
,
B
,
C
and
N
should be
connected
to
lead
C
lead
B
lead
A
lead
N
15
Courtesy of NationalSwitchgear.com

GEK
-
49813
The other
adjustments
indicated
in
Figure
14
are
trim
potentiometers
located
on
printed
-
circuit
cards
.
These
adjustments
are
set
in
the
factory
and
should
not
normally
require
readjustment
.
See
the
ACCEPTANCE
TESTS
section
of
this
book
for
the
recommended
procedures
if
readjustment
is
required
.
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
transit
.
If
injury
or
damage
resulting
from
rough
handling
is
evident
,
file
a
damage
claim
at
once
with
the
transportation
company
and
notify
the
nearest
General
Electric
Sales
Office
.
Reasonable
care
should be exercised
in
unpacking
the
relay
in
order
that
none
of
the
parts
are
injured
nor
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
inside
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 TEST
should be
made
to
make
sure
that
no
damage
has
been
sustained
in
shipment
and that
the
relay
calibrations have
not
been disturbed
.
These
tests
may
be
performed
as
part
of
the
installation
or
of
the
acceptance
tests
,
at
the
discretion
of
the
user
.
Since
operating
companies
use
many
different
procedures
for
acceptance
and installation
tests
,
the
following
section
includes
applicable
tests
that
may
be
performed
on
these
relays
.
VISUAL
INSPECTION
Check
the
nameplate
stamping
to
make
sure
that the model
number
and
rating
of
the
relay
agree
with
the
name
requisition
.
Remove
the
relay
from
its
case
and that there
are no
broken
or
cracked
molded
parts
or
other
signs
of
physical
damage
,
and
that all
screws
are
tight
MECHANICAL
INSPECTION
Case
and
Cradle
Blocks
Check
that the
fingers
on
the
cradle
and
the
case
agree
with
the
internal
-
connection
diagram
.
Each
cradle
finger
should be
flush
or
project
above the barrier between
fingers
.
Check
that there
is
a
coil
spring
under
each
finger
.
The
case
fingers
,
if
not
held down
by
a
shorting
bar
,
should
come
within
one
-
sixteenth
of
an
inch
(
1
/
16
"
)
of
touching
a
straight
-
edge
bridging
the
case
block
from
side
to
side
.
If
held down
by
a
shortening
bar
,
it
should
require
at
least
one
pound
force
(
450
grams
)
to
open
the electrical
circuit
between
the
finger
and
the
shortening
bar
.
See
Figure
12
.
Check
that each
auxiliary
brush extends
above
the
barrier
fingers
.
16
Courtesy of NationalSwitchgear.com

6
EK
-
49813
Target
Unit
The
target
unit
has
an
operating
coil
tapped
at
0.6
and
2.0
amperes
.
The
relay
is
shipped
from
the
factory
with
the
tap
screw
in
the
higher
ampere
position
.
The
tap
screw
is
the
screw
holding
the
right
-
hand
tap
plate
.
To
change
the
tap
setting
,
first
remove
one
screw
from
the
left
-
hand
plate
and
place
it
in
the
desired
tap
on
the
right
-
hand
plate
.
Next
remove
the
screw
from
the
undesired
tap
(
on
the
right
-
hand
plate
)
and
place
it
on
the
left
-
hand
plate
where
the
first
screw
was
removed
.
Following
this
procedure
maintains
the
contact
adjustments
.
See
Figure
14
.
Screws
should
never
be
left
in
both
taps
at
the
same
time
.
TABLE
IX
TARGET
PICKUP
CURRENTS
PICKUP
CURRENT
IN
AMPERES
TAP
0.35
-
0.6
1.15
-
2.0
0.6
0.2
The
backing
strip
should
be
so
formed
that
the
forked
end
(
front
)
bears
against
the
molded
strip
under
the
armature
.
Since
mechanical
adjustments
may
affect
the
Seismic
Fragility
Level
,
it
is
advised
that
no
mechanical
adjustments
be
made
if
seismic
capability
is
of
concern
.
Telephone
Relay
With
telephone
relays
in
the
de
-
energized
position
all
circuit
-
closing
contacts
should
have
a
gap
of
at
least
0.015
inch
and
all
circuit
-
opening
contacts
should
have
a
wipe
of
0.005
inch
.
Gap
may
be
checked
by
inserting
a
feeler
gage
between
the
contacts
,
and
wipe
can
be
checked
by
observing
tne
amount
of
deflection
on
the
stationary
contact
before
parting
the
contacts
.
The
armature
should
then
be
operated
by
hand
and
the
gap
and
wipe
again
checked
as
described
above
(
0.015
"
gap
,
0.005
"
wipe
)
.
ELECTRICAL
TESTS
,
GENERAL
All
alternating
-
current
-
operated
devices
(
AC
)
are
affected
by
frequency
.
Since
non
-
sinusoidal
waveforms
can
be
analyzed
as
a
fundamental
plus
harmonics
of
the
fundamental
frequency
,
it
follows
that
alternating
-
current
devices
(
relays
)
will
be
affected
by
the
applied
waveform
.
Therefore
,
in
order
to
test
alternating
-
current
relays
properly
it
is
essential
to
use
a
sine
-
wave
source
of
current
and
voltage
.
DIELECTRIC
TESTS
Introduction
1
The
surge
capacitors
used
in
the
type
SLYG
relay
do
not
have
voltage
ratings
to
withstand
AC
hipot
voltage
;
therefore
,
caution
must
be
exercised
when
hipotting
to
avoid
damaging
these
capacitors
.
It
is
recommended
that
hipot
tests
be
performed
on
a
bench
with
the
relay
in
its
case
.
If
the
relay
is
to
be
hipot
tested
together
with
other
apparatus
in
an
equipment
,
all
external
connections
to
terminal
10
(
surge
ground
)
must
be
removed
.
17
Courtesy of NationalSwitchgear.com

GEK
-
49813
The
hipot
test
voltage
should
be
1500
volts
rms
,
50
or
60
hertz
for
new
relays
,
or
1125
volts
rms
,
50
or
60
hertz
for
other
relays
.
New
relays
are
defined
as
those
that
have
not
been
in
service
,
that
are
not
more
than
one
year
old
from
the
date
of
shipment
,
and
that
have
been
suitably
stored
to
prevent
deterioration
.
The
duration
of
application
of
the
test
voltage
should
be
60
seconds
.
Hipot
Tests
2
.
(
a
)
Common
-
Mode
Hipot
Tests
(
All
terminals
to
case
)
:
Temporary
connections
should
be
made
to
tie
together
all
relay
terminals
,
including
terminal
10
together
.
Hipot
voltage
can
then
be
applied
between
this
common
connection
and
the
relay
case
.
(
b
)
Transverse
-
Mode
Hipot
Tests
(
Between
circuits
)
:
For
hipot
tests
between
circuits
of
the
relay
,
the
surge
capacitors
must
be
temporarily
disconnected
from
the
surge
capacitor
buses
inside
the
relay
.
The
relay
terminals
should
be
jumpered
to
provide
the
four
groups
of
circuits
shown
in
Table
X
.
Hipot
voltage
can
then
be
applied
between
any
two
groups
of
circuits
TABLE
X
CIRCUIT
GROUPING
FOR
TRANSVERSE
-
MODE
HIPOT
TESTS
CIRCUIT
GROUP
JUMPER
BETWEEN
TERMINAL
NUMBERS
I
,
2
,
3
,
4
,
5
,
6
,
7
and
8
15
,
16
,
17
and
18
9
,
19
and
20
II
,
12
,
13
,
and
14
AC
Current
AC
Potential
DC
Control
Power
Output
Contacts
An
alternate
test
using
a
500
volt
DC
Megger
can
be
performed
between
the
circuit
groups
of
Table
X
with
the
surge
capacitors
connected
in
their
normal
manner
.
While
this
method
does
not
test
the
relay
to
its
full
dielectric
rating
,
it
will
detect
some
cases
of
degraded
insulation
.
Restoring
Relay
to
Service
3
.
After
the
hipot
or
megger
testing
is
completed
,
the
surge
capacitors
should
be
reconnected
to
the
surge
capacitor
buses
,
and
all
external
wiring
to
terminal
10
should
be
reconnected
.
The
reach
tests
described
under
the
ACCEPTANCE
TESTS
section
of
this
book
should
then
be
repeated
.
DETAILED
TESTING
INSTRUCTIONS
1
.
Required
Settings
Make
certain
all
the
relay
settings
have
been
made
.
These
should
be
in
accordance
with
the
setting
calculations
.
The
settings
are
:
Base
reach
(
ZRI
)
is
set
on
the
tap
block
at
the
rear
of
the
relay
.
All
three
phase
settings
should
be
the
same
.
The
"
Neutral
"
reach
will
normally
be
the
same
as
the
phase
reach
.
(
a
)
18
Courtesy of NationalSwitchgear.com

GEK
-
49813
(
b
)
Percent
restraint
(
T
)
is
set
on
the
precision
potentiometer
on
the
front
of
the
relay
.
(
c
)
Zero
-
sequence
current
compensation
(
Ko
)
is
set
by
means
of
the
Ko
plug
on
printed
-
circuit
card
"
SP
"
.
2
.
Relay
Base
-
Reach
Angle
and
Reach
Check
The
following
procedure
is
recommended
to
check
the
base
-
reach
angle
(
0
)
and
the
relay
reach
setting
(
ZR
)
.
a
)
Make
the
test
connections
shown
in
Figure
23
for
the
particular
phase
being
tested
.
b
)
Adjust
the
load
box
until
the
ammeter
indicates
the
desired
test
current
(
lj
)
.
See
Table
XI
for
the
recommended
test
current
for
a
desired
reach
.
TABLE
XI
RECOMMENDED
TEST
CURRENT
1
AMPERE
RATED
RELAY
5
AMPERE
RATED
RELAY
BASE
REACH
TAP
RECOMMENDED
MINIMUM
TEST
CURRENT
RECOMMENDED
MINIMUM
TEST
CURRENT
BASE
REACH
TAP
0.5
4
+
t
20
+
t
0.1
20
tt
1.0
4
tt
0.2
2
2.0
10
t
+
0.4
1.6
8
3.75
0.75
7.5
0.8
4
1.5
15
0.4
2
3
tt
The
relay
is
not
rated
to
carry
this
current
continuously
.
It
should
not
be
applied
longer
than
five
(
5
)
minutes
,
with
an
off
time
of
at
least
five
(
5
)
minutes
.
Adjust
the
phase
for
the
nominal
base
-
reach
angle
of
80
°
.
Observe
the
waveform
at
the
following
test
point
(
on
OS
card
)
with
an
oscilloscope
.
"
AOUT
"
for
phase
A
"
BOUT
"
for
phase
B
"
COUT
"
for
phase
C
Lower
the
voltage
Vj
to
the
value
given
in
equation
(
2
)
below
:
c
)
d
)
D
2
)
3
)
e
)
1
INZH
i
z
R
0
(
2
)
2
+
K
0
|
3
T
/
100
19
Courtesy of NationalSwitchgear.com

GEK
-
49813
where
operating
current
zero
-
sequence
current
compensation
tap
setting
(
plug
on
SP
card
)
restraint
voltage
setting
in
percent
pickup
voltage
atthe base
-
reach
angle
in
volts
rms
base
-
reach
tap
in
ohms
As
the
voltage
is
lowered
,
observe the
waveform
at
the
test
point
designated
in
step
d
)
above
.
At
the
point
where
the
telephone
relay
(
K
2
)
picks
up
,
a
slight
adjustment
of
the
phase
angle
and
input
voltage
will
cause
the
waveform
to
be
reduced
to
a
null
consisting
of
only
third
and
fifth
harmonics
.
At
this
null
point
(
2
)
the
angle
on
the
phase
-
angle
meter
is
the base
-
reach
angle
,
0
,
and should be
within
two
degrees
(
2
°
)
of
the
nominal
value
of
80
°
.
The
voltage
Vy
at
this
null
condition
should
be
within
five
percent
(
5
%
)
of
the
value
calculated
by
equation
IN
Ko
T
VT
ZRI
f
)
(
2
)
.
NOTE
:
THE
MEASURED PICKUP
SHOULD
AGREE
WITH THE
CALCULATED
VALUE
WITHIN
±
5
%
.
IF THE
VALUES
DO NOT
AGREE
WITHIN
THESE
LIMITS
,
IT
IS
RECOMMENDED
THAT THE
TEST
SETUP
AND
METER
CALIBRATIONS
BE
CHECKED
BEFORE
THE
FACTORY
SETTINGS
ON
THE RELAY ARE
DISTURBED
.
ONE GOOD METHOD OF
CHECKING
THE
TEST
SETUP
AND
PROCEDURE
IS
TO
REPEAT THE
TESTS
ON
A
DUPLICATE
RELAY
.
g
)
If
it
is
desired
to
readjust
the reach
so
that
measured
pickup
occurs
at
a
value
closer
to
the
calculated
value
,
this
may
be
accomplished
by
means
of
the
trim
potentiometers
on
the
SP
card
.
The
potentiometer
to
be
adjusted
for
each
phase
is
shown
in
Table
XII
.
These
potentiometers
should be
turned
clockwise
to
increase
the reach
.
TABLE XII
REACH ADJUSTMENTS
LOCATIONS
PHASE
UNDER
TEST
POTENTIOMETER
DESIGNATION
POTENTIOMETER
LOCATION
A P
1
Top
Middle
Bottom
B P
2
C
P
3
20
Courtesy of NationalSwitchgear.com