GE CEY52B User manual

INSTRUCTION
S
GEK—45495
U
MHO
DISTANCE
RELAY
TYPE
CEY52B
GENERALS
ELECTRIC

GE K-A
5495
CONTENTS
PAGE
LsURJPTION
3
APF’L
I
(Al
I
ON
3
RATINGS
2
OPERATING
PRINCIPLES
4
CHARACT[RISEILS
5
BURDENS
7
LALCULA1 iON
OF
SETTINGS
7
UONSTRUCT
ION
N
RECEIVING,
HANDLING
AND
STORAGE
8
ACLEPTANCE
TESTS
9
ASTALLATION
PROCEDURE
11
INSPECTION
14
PLRIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
14
SERVICING
15
RENEWAL
PARTS
17
‘S.)
to
C-)
CD
to
to
“S

GE
K-4 54
95
MHO
DiSTANCE
RELAY
TYPE
CEY52B
DESCRIPTION
The
CEY52B
relay
is a
three-phase,
high
speed,
single-zone
directional
mho
distance
relay.
it
WaS
designed
specifically
for
use
with
the
CEX2OA
or
CEX2OB
reactance
type
relay.
See Table
I. The
CEY52B
relay
is
constructed
of
three
single—phase
units
mounted
in
one
L2—D
case
with
provisions
for
sirjle
phase
testing.
The
interndl
connections
for
the
relay
are
shown
in
Figure 10,
while
outline
and
panel
drilling
dimensions
are
shown
in
Figure
16.
Typical
external
connections
to
the
relay
are
shown
in
Figure
4. The
relay is
not
intended
for use
as
a
first
zone
function,
thus the
transient,
overreach
characteristics
have
not been
limited
in
this
respect.
TABLE
I
BASIC
MINIMUM REACH
SELECT
CEX
SHOWN
BELOW
TAPS
OF
CEY52R
_________________-
0.5
—
1.0
-
1.5
CEX2OA
1.0
-
2.0
-
3.0
CEX2OR
APPL
ICATION
The
C[Y52B
relay is
a
three—phase,
single
zone
mho distance
relay
that
is
not
meant
to
be
used
by
itself,
but
rather
is
designed
to
be
used
with
a
CEX2OA
or
CEX208
reactance
type
relay.
The
combination
of
relays
may
be
used
in
a
step-distance
scheme
to
provide
two
zones
of
protection
against
phase
faults,
or
they
may
be
used
as
part
of a
high-speed
pilot-relaying
scheme
in addition
to
providing
step-distance
protection.
Figure 4
illustrates
typical
external
connections
to
the
relay
when
it
is
used
in
a
step-
distance
scheme
with
the
CEX2OB
relay.
When
applying
this
relay
for the
protection
of
a
given
circuit,
select
the
highest
basic
minimum
reach
tap
that
will
acconinodate
the
desired
reach
setting.
This
will
insure
that
the
relay
will
operate
at
the
highest
possible
level
of torque.
Since
the
memory
action
of
the
CLY52B
will
only
be
effective
for
several cycles
after
the
inception
of
a
fault,
the
relay
should
not
be
relied
on
to
provide
time-delay
protection
for
any
fault
that
provides
zero
voltage
at
the
relay.
The
protection
should
be
supplemented
by
other
devices to
detect
this
condition
if
protection
for
this
contingency
is
required.
The
section
under
CALCULATION
OF
SETTINGS
provides
a
worked
example
for
determining
the
settings
of the
CEYS2B
in
a
typical
application.
Once
the
settings
have
been
calculated,
the
taps
are
set
as
described
in
the
section
entitled
TAPPED
AUTO—TRANSFORMERS.
Under
no
conditions,
should
the
restraint
taps
ever
be
set
less
than
25
percent.
RATINGS
The
type
CEY52
relay
covered
by
these
instructions
is
available
for
120
volts,
5
amperes,
60 or
50
cycles
rating.
The
basic
minimum
reach
and
adjustment
ranges
of the
inho
units
are
given
in Table
II.
t
will
be
noted
that
three
basic
minimum
reach
settings
are
listed
for
the
mho
units.
Selection
of the
desired
basic
minimum
reach
setting
for each
unit
is
made
by
means
of links
on
a
terminal
board
located
at
the back
of
the
relay
(see
Fig.
2).
The
position
of
the
two
sets
of
links,
(for
each
unit),
each
identified
as
A-B
determine
the
basic
minimum
setting
of the
mho
units.
The
ohmic
reach
of
the
inho units
can
be
adjust-nd
in
one
percent
steps
over
a
4/1
range
for
any
of the
basic
minimum
reach
settings
listed
in
Table
II
by
means
of
autotransformer
tap
leads
on
the tap
blocks
at
the
right
side
of the
relay.
—--..____
Thnie
utcton
do
no.t
pu.’tpo-’t-t
-to
eovciz.
aU
detaiJs
0L
n
c2u.prnnnt
no
to
p4ovd
oi
evuuj
po
sA6e
con.tA,nqenc.y
to
be
met
UL
connec,tcon
wLth
n-taitiou,
ope’Litu)e
o’
miLtefltliIrc.
St(!Led
u’ctfte’L
-ui 1 jo’tnri..tLon
bi de’u’,d
o.’
I-touLd
pa.’ct
cithvi.
pitobfms
aJLe
wh{cJ!
aiz.C
not
cOvQYted
Lt?etif
OL
the pu’tcha.ea’-
pwtpoe,
the
rnattc’t
hou.fd
be
e 1 eived
to
thc
(cvtc’uct
etsc
Conipanu.
Io
the
oxteiit
.‘LequL’ted
the
p’wduc.ta
dci.eailied
eke4n
rnec’-t
appcaIit’e
ANSI,
1H
a,id
IMA
ttz;
hIlt ,‘to
ucJi
asu.’utnce
..a
guJen
w-tk
‘tc.apee.t
to
tocitf
eode4
azid
icknanet’
b1 cauc
tlzoe
oa-i
L’att’1.
3

GE K-4
5495
TABLE
II
BASIC
MTN REACH
r
RANGE
ANGLE
OF
ONE
SECOND
BASIL
REACH
TAPS
(ØN
OHMS)*
(0-N
OHMS)
MAX
TORQUE
RATING
0.5
0.5
- 2.0
600
**
150
0.5
-
1,0
- 1.5 1.0 1.0
-
4.0
600
**
150
1.5
1.5
- 6.0
60°
**
150
1
1—4
600
**
150
1-2-3
2
2-8
600
**
150
3-
___
*Adjustment
taps
are
set
using
middle
tap
at
the
factory.
**MaxiIiluIli
torque
angle
can
be adjusted
up
to 75
degrees.
The
reach
of
the
iriho
units
will
increase
to
approximately
120
percent
of
its
reach
at
the
60
degree
setting.
CONTACTS
The
contacts
of
the
CEY52
relay
will close
and
carry
momentarily
30
amperes
direct
current.
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 CEY52
relay
has
ratings
as
shown
in
Table
III.
TABLE
III
TARGET
SEAL-IN UNIT
0.2
AMP
TAP
0.6
AMP
TAP
0
AMP
TAP
inum
Operating
-
0.2
amp
0.6 amp
—
2.0 amp
Carry
Continuously
0.4
amp
1.5
amp
3.5
amp
Carry
30
amps
for
0.03_=
i
0.5
sec.
4.0
sec.
Carry
10 amps
for
0.25
sec.
4.0
sec.
30.0
sec.
0-C
Resistance
+lOt
7.0
ohms
0.6
ohms
0.13
ohms
60 Cycle
Impedance
52 ohms
6.0 ohms
0.53
ohms
OPERATING
PRINCIPLES
The
nihc
units
of
the
CEY52
relay
are
of the
four
pole
induction
cylinder construction
in
which
torque
‘o:roduced
ty
the
interaction
between
a
polarizing
flux
and
fluxes
proportional
to the
restraining
or
operating
quantities.
The
sc[.emlii:
connections
of
the
rho
jr
t
are shown
n
Fia
.a.
Tue
two
side
poles,
oneraized
by
se—tc-jhuse
c’
tage,
prodoce
the
gel arzinc
iu
The
flu
in
the
front
p010,
which
is
energized
by
a
Dr
entaq
f
the
5éiPi
priase
-to-phasa vo1tiçc
ntr
s
iith
the
polorizing
flux
to
produce
restrain
tcr
we.
Th
Cl ux
in
the
rear
pole,
which
1.
•nero1z:
by
the
two
I inc
currents
associated
with
the
seme
zhse-
to-phase
taqe,
interacts with
the
nolan
cc
t
produce
operating
torque.
The
torque
ot
the balance
point
o the
wit
car
triereforo
.ne
rxpr’.sed
by
the
following
equation:
Torque
=
0
El
cos
(0-9)
- KE 2
where:
E
phase-to—phase
voltage
(E 12 )
I
=
delta
current
1
-
12)
0
=
angle
of
maximum
torque
of the
unit
0
=
power
factor
angle
of
fault
impedance
K =
design
constant
4

GE
K—4
54 95
to
prove
that
the
equation
defines
a
mho
characteristic
divide
both
sides
by
[2
and
transpo.e.
The
equation
reduces
to:
cos
(
-
0)
K
or:
Y
cos
(
-
B)
K
Thus,
the
unit
will
pick
up
at
a
constant
component
of
admittance
at
a
fixed
angle
depending
on
the
angle
of
maximum
torque.
Hence,
the
name
mho
unit.
CHARACTER
ISTICS
MHO
UNIT
1.
Impedance
Characteristic
The
impedance
characteristic
of
a
mho
unit
is
shown
in
Fig.
6 for
the
one
ohm
basic
minimum
reach
setting
at
a
maximum
torque angle
of
60
degrees.
This
circle
can
be
expanded
by
means
of
the
mho
taps
on
the
autotransformer
tap
block
providing
a
range
of
up
to
4/1 ,
or
by
changing
the
basic
minimum
reach
of
the
unit
by
means
of the
links
on
the
rear
providing
a
total
range
of
up
to
12/1.
The
circle
will
always
pass
through
the
origin
and
have
a
diameter
along
he
60
degree
impedance
line
equal
to
the
ohmic
reach
of
the
unit
as
expressed
by
the
following:
(lo0
z
Ohmic
Reach
tap
setting
()
where:
2 njin
=
basic
mm.
phase-to-neutral
ohmic
reach
of
the
unit.
The
angle
of
maximum
torque
of
the
mho
unit
can
be
adjusted
up
to
75
degrees
(see
SERVICING)
with
resulting
increase
in
reach
to
approximately
120
percent
of
its
reach
at
60
degrees
for
the
same
tap
setting.
Ths
is
shown
iy
the
dotted
characteristic
in
Fig.6.
.
irec
.iunal Action
TihO
unit
is
carefully
adjusted
to
have
correct
directional
action
under
steady—state,
low
voltage
low
current
conditions.
For
faults
in
the
non-tripping
direction,
the
contacts will
remain
open
at
:eri
volts
between
0
and
60
amperes.
For
faults
in
the
tripping
direction,
the
unit
will
close
its
con
tact:
between
the
current
limits
in Table
IV
for
the
three
basic
minimum
reach
settings
at
the
voltage
shown.
This
adjustment
is
a function
of the
core
(inner
stator)
position
and
should
any
adjustment
be
‘tecessary
see
SERVICING.
TABLE
IV
CURRENT
RANGE
FOR
BASIC
MIN
*VOLTS
CORRECTOIRECTIONAL
REACH
TAP
ACTION
2.0 vol
ts
12
-
60
amps
1.0
2.0
volts
6
-
60
amps
1.5
2.0 volts
4.5
-
60
amps
2
i
2.0 volts
3
—
60
amps
2.0
volts
j_
2
-
60
amps
*The
unit
is
set
at
the
factory
on
the
middle
tap
(lii
for
0.5/1/1.5
unit
and
2
for
1/2/3
ohm
unit)
for
correct
directional
action
over
the
indicated
current
range.
A
variation
of
+10
percent
can
be
expected
on
the
values
listed.
For
performance
during
transient
low-voltage
conditions,
where
the
voltage
was
normal
at
120
volts
prior
to
the
fault,
refer
to
the
paragraph
below
on
memory
action.
5

GEK-45495
3,
linderreach
t reduced
voltaqe
the ohmic
value
at
which
the niho
unit
will
operate
may
be
somewhat
lower
than
the
LJICulat(d
value.
This
pullback
or
reduction
in
reach
is
shown
in
Fig.
3
for
the
1,
2
and 3
ohm basic
miiInuI1
reach
settings.
The
unit reach
in
percent
of
setting
is
plotted
against
the
three—phase
fault
cur
oi
liree
ohmic
reach
tap settings.
Note
that
the fault
current
scale
changes
with
the
basic
r,iniiuuw
,L:ing.
The
itho
unit will
Operate
for
all points
to
the
right
of
the
curve.
The
steady-state
curves
of
rig.
3
wirer
determined
by
tests
performed
with
no
voltage
supplied
to
the
relay
before
the
fault
W.i
‘pHed.
The
dynamic
curves
were obtained
with
full
rated
voltage
of
120 volts
supplied
to
the
relay
before
hr laul
t
mis
applied.
4.
Memory
Action
[he
dynamic
curves
of
Fig.
3
illustrate
the
effect
of
memory
action
in
the who
unit
which
maintains
the
polorizing
flux
for
a
few
cycles
following
the
inception
of
the
fault.
This
memory
action
is
particularly
effective
at
low
voltage
levels
where
it
enables
the
who
unit
to
operate for
low
fault
currents.
This
can
be
nost
forcefully
illustrated
for a
zero
voltage
fault
by referring
to
Fig.
3.
A
zero
voltage
fault
must
be
ri
ht
at
time relay
bus
and therefore,
to
protect
for
this
fault,
it
is
imperative
that
the
relay
reach
zero
percent
of
its
setting.
Fig.
3
shows
that
the
who
unit,
under
static
conditions,
will
not
see
a
fault
at
zero
percent
of
the
relay
setting
regardless
of
the tap
setting.
However,
under
dynamic
conditions
when
the
memory
action
is
effective,
Fig.
3
shows
that
mho
unit
with
a
three-ohm
basic
minimum
reach
and
100
percent
tap
setting
will
operate
if
I3
is
greater
than
1.6
amperes.
The
memory
action
will
close
the contact
for
only
a
short
period
of
time
and
therefore,
memory
action
cannot
be relied
on if
the tripping
is
delayed.
When
the
relay
is
used,
as
a
second
zone
relay
and
tripping
is
delayed
by
the
zone
2
setting
of
the
type
RPM
relay,
the
static
characteristic
should
be
used.
For
this
application
to
operate
for nearby
faults
and
there
will
be
sufficient
voltage
to
give tripping
without
depending
on
memory
action.
5.
Operating
Time
The
operating
time
of
the who
unit
is
determined
by
a
number
of
factors
such as
the
basic
minimum
reach
setting
of the
unit,
fault
current
magnitude,
ratio
of
fault
impedance
to
relay
reach,
and
magnitude
of
relay
voltage
prior
to
the fault.
The
curves
in
Fig.
8
are
for
the
condition
of
rated
volts
prior
to
the
fault.
Time
curves
are
given
for
four
ratios
of
fault
impedance
to relay
reach
setting.
In
all
cases,
the
rnho
taps
were
in
the
100
percent
position
and
the
angle
of
maximum
torque
was
set at
60
degrees
lag.
TAPPED AUTO-TRANSOFRMERS
(See
Fig.
7)
The
ohmic
reach
of the
mho
units
may
be
adjusted
by
means
of
taps
on
the
two auto-transformers.
Each
auto-transformer
has
two windings.
One
winding
is
tapped
in
10 percent
steps
from
15
percent
to
95
percent.
The
other
winding
is
tapped
at
0
percent,
1
percent,
3
percent
and
5
percent.
The desired
tap
setting
is
made by
the
proper
location
of the
leads
marked
No.
1
and
the
jumper
con
necting
the
two
windings
of
the auto-transformer.
Note
that
the
0—5
percent
winding
may
be
added
or
subtracted
from
the
15-95
percent
winding.
The
tap
setting
required
to protect
a
zone
Z
ohms
long,
where
Z
is
positive
phase
sequence
phase-to-
neutral
impedance
expressed
in
secondary
terms,
is
determined
by
the
following
equation:
(100)
(Mm.
Ohms
Setting)
Cos
(—@)
Tap
Setting
=———
_______——______
______
where:
0
Power
factor
angle
of
fault
impedance
9 Angle
of
maximum
torque
of
the
unit
:Xj
ale
1:
TAP
SETTING
DESIRED
=
91
Set
one end
of
jumper lead to
95
percent.
Set
the
other
end
to
5
percent.
Set
No.
1
to 1
percent.
cite
the 4
percent
setting
of
the
0—5 percent
winding
subtracts
from
the
95
percent
setting)
:xample 2:
TAP
SETTING
DESIRED
89
Set one
end of jumper
lead
to 85
percent.
Set the
other
end
to
1
percent.
Set No.
1
to
5
percent.
m,Nate
the
4
percent
setting
of
the 0-5 percent
winding
adds
to
the
85
percent
setting.)
6

GEK-45495
CIRCUIT
FREQ R
X
P.F.
WATTS
VARS_—
VA
The
potential
burden
of the
niho
unit
is maximum
when the
restraint
The restraint
circuit
burden
and
hence
the
total
relay
burden
will
setting
is less
than
100
percent.
The
potential
burden
at
tap settings
less
than
100
percent,
can
be
formula.
VA
=
(a
+ jb)
rTap
Setting]
2
+ (c +
L
100
The
terms
(a
+
jb)(c
+
jd),
etc.
represent
the burdens
of
the
mho unit potential
circuit
expressed
in
watts
and vars
with
their
taps
on
100
percent.
The
values
of
these
terms
are given
in
Table
VI.
(a
+ jb)
=
(wattc
+
j
vars)
for
restraint circuit
and (c
÷ jd)
= (watts
+
j
vars)
for
polarizing
circuit.
CALCULATION
OF
SETTINGS
Tcride
230kv
transmission
line 50
miles
long
having
a phase—to—neutral
impedance
of:
0.14
+ j
0.80
ohms
per
nile,
Zpri
= 50
(0.14
+
jO.80)
= 7
+ j40
ohm
total
=
CT
Ratio
sec
pri
PT
Ratio
z =
+ j40.Q)
120
= 0.42
+
j?.a
ohms
ec
2000
Zsec
= 2.43
/
80.5°
ohms
BURDENS
CURRENT
CIRCUITS
The
maximum
current
burden
imposed
on
each
current
transformer
at
5
amperes
is
listed
in Tah1€
.
TABLE
V
AMPS
CYCLES
5
This
data
is
for the
3.0
ohm
or 50 cycles will
be
lower.
POTENTIAL
CIRCUITS
R
X
P.F.
WATTS
VA
.043 .026
0.86 1.08
1.25
The
maximum
potential
burden
basic
reach
tap
setting
for
60
cycles.
The burden
for
the lower
tap
setting
imposed
on each
potential
transformer at
120
volts
is listed
in
Table VI.
TABLE
VI
Polarizing
Restraint
Polarizing
Restraint
60
60
50
50
1534
1060
2200
1160
10
1580
1
35
1600
1 .00
0.55
1.00
0.73
9.4
4.2
6.5
4.3
0.1
6.3
0.4
5.9
9.4
7.6
6.5
7.2
tap is
set for
100
percent.
decrease
when
the
restraint
tap
calculated
from the
following
PT
Ratio
CT
Ratio
= 230,000/115
= 2000/1
= 600/5
= 120/1
7

GE
K-4
54
95
Assume
that
the
CEY52
is
to
be
used
in
conjunction
with
a
CEX2OA
to
provide
second
zone
protection
and
it
is
uesired,
after
considering
the
effects
of
infeed,
to
set
the
relay
to
reach
3.64
/80.50
secondary
ohms.
For
this
application
the
three-ohm
basic
minimum
reach
setting
should
be
used.
The
ohmic
reach
equation,
given
*i
the
section
under
CHARACTERISTICS-
TAPPED AUTO-TRANSFORMERS
is
used.
(100)
(Mm.
ohms)
Cos
(0—9)
Percent
Tap
Setting
=
_________
______
7
z
==
3.54
Minimum
Ohms
3.0
at
60
deg.,
3.6
at
75
dog.
9
=
750
=
80.5°
(100)
(3.6)
Cos
(80.5
—
75)
Percent
Tap
Setting
=
_____________________________
3.64
Percent
Tap
Setting
=
CONSTRUCTION
The
type
CEYS2
relays
are
assembled
in a
deep
large
size,
double-end
(L2D)
drawout
case
having
studs
at
both
ends
in
the
rear for
external
connections.
The
electrical
connections
between
the
relay
units
and
the
case
studs
are
made
through
stationary
molded
inner
and
outer
blocks
between
which
nests
a
removable
connection
plug
which
completes
the
circuits.
The
outer
blocks
attached
to
the
case
have
the
studs
for th’
external
connections
and
the inner
blocks
have the
terminals for
the
internal
connections.
Every
circuit
in
the
drawout
case
has
an
auxiliary
brush,
as
shown
in
Fig. 9,
to
provide
adequate
overlap
when
the
connecting
plug
is
withdrawn
or
inserted.
Some circuits
are equipped
with
shorting
bars
(see
internal
connections
in Fig.
10)
and
on
those
circuits,
it
is
especially
important
that
the
auxiliary
brush
make
contact
as
indicated
in
Fig.
9
with adequate
pressure
to
prevent
the
opening of
important
inter
locking
circuits.
The
relay
mechanism
is
mounted
in
a
steel
framework
called
the
cradle
and
is
a
complete
unit
with
all
leads
terminated
at
the
inner
block.
This
cradle
is
held
firmly
in the
case
with
a
latch
at
both
top
and
bottom
and
by
a
guide pin
at
the
back
of the
case.
The
connecting
plug,
besides
making
the
electrical
connections
between
the
respective
blocks
of
the
cradle
and
case,
also
locks the
latch
in
place.
The
cover,
which
is
drawn to
the
case
by
thumbscrews,
holds
the
connecting
plugs
in
place.
The
target
reset
mechanism
is
a
part
of
the
cover
assembly.
The
relay
case is
suitable
for
either
semi—flush
or
surface
mounting
on
all
panels
up
to
two
inches
thick
and
appropriate
hardware
is
available.
However,
panel
thickness
must
be
indicated
on
the
relay
order
to
insure
that
proper
hardware
will
be
included.
A
separate
testing
plug
can
be
inserted
in
place
of
the connecting
plug
to
test
the
relay
in
place
on
the
panel
either
from
its
own
source
of
current
and
voltage,
or
from other
sources;
or
the
relay ca
be
drawn
out
and
replaced
by
another
which
has
been tested
in
the
laboratory.
Pies.
1
aid
2
show
the
relay
removed
ro its drawout
case
wth
all
major
components
ider.ti
fiec
-
‘abo1s
usea
tc
identify
nircuit
components
are the
arie
as
those
which
appear
an
the
interncl
connection
nagram
in
Fip. 10.
The
ralav
icaludes
th’en
similar
rho
suhassembi:
Cienents
mojntcd
on
the
front
of
the
cradle
ann a
a’
ito
wi
t
trrisforrners
and tap
blocks
mounted
or
‘bc
back
-‘
the
cradle.
See
Rj 05
and 2
The
rio
sub-a;seIHbly
includes
the
fOL
i—pole
or
ossoc
i ated
circuit
cunipcnents.
heostt.
2.
R23
ssed
in
settinq
tie
angle
f
ma.’inlui
torce
inS rrnostats
811
,
R2,
813
used
jr
settinj
the
basic
minmJm
reach
car
oe
adjusted
from
the
front
of
the
relay.
The tap
blockS
for changirg
the
basic
r;inioum
reach
of
ne
units
are mounted
on the
back.
The
relay
most
he
removed
from its
case
to
make
the settings.
RECEIVIND,
HANDLING
AND
STORAGE
hese
relays,
when
not
included
as
i
part
of
a
control
panel, will
be
shipped
in
cartons
designed
to
orotect
them against
damage.
Irnediately
upon
receipt
of
a
relay,
examine
it
for
any
4 mage
sustained
in

GE
K-4 5495
transit.
If
injury
or
damage
resulting
from
rough
handling
is
evident,
file
a
damage
claim
at
once
with
the
transportation
company
and promptly
notify
the
nearest
General
Electric
Apparatus
Sales
Office.
Reasonable
care
should
be
exercised
in
unpacking
the
relay
in
order
that
none
of the
parts
are
injured
or
the adjustments
disturbed.
If
the relays
are
not
to
be installed
ininediately,
they
should
be
stored
in
their
original
cartons
in
a
place
that
is
free
from
moisture,
dust
and
metallic
chips.
Foreign
matter
collected
on
the
outside
of
the
case
may find
its
way
nside
when
the
cover
is
removed
and
cause
trouble
in
the
operation
of
the
relay.
ACCEPTANCE
TESTS
Immediately
upon
receipt
of the
relay,
an
inspection
and
acceptance
tests
should
be made
to insure
that
no
damage
has
been
sustained
in
shipment
and
that
the
relay
calibrations
have
not
been
disturbed.
If
the
exwiination
or
test
indicates
that
readjustment
is
necessary,
refer
to the
section
on
SERVICING.
ViSUAL
INSPECTION
Check
the
nameplate
stamping
to
insure
that
the
model
number
and
rating
of
the
relay
agree
with
the
requisition.
Remove
the
relay
from
its
case
and
check
that
there
are
no
broken
or
cracked
molded
parts
or
other
signs
of
physical
damage,
and
that
all
screws
are
tight.
MECHANICAL
INSPECTION
1.
It
is
recomended
that
the mechanical
adjustments
in Table
VIII
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
three units
must
be
open.
The
moving
contacts
of
the
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.
6.
Check
the
location
of
the
contact
brushes
on
the
cradle
and
case
blocks
against
the
internal
connection
diagram
for
the
relay.
TABLE
VIII
CHECK
POINTS
MHO
UNITS
Rotating Shaft
End Play
f
.010
-
.015
inch
Contact
Gap
I
.145
-
.155 inch
Contact
Wipe
.003
-
.005
inch
____
L[CRJCAL
CHECKS
-
WHO
UNiTS
e:-
be
adde
with
e1a
in
case.
Before
any
electrical
checks
are
made
on
the
mho
units
the
1 a.•
sho
cernected
ss
shown
in
Fig.
l
an•
be
allowed
to
warm
op for
approximately
15
minutes
with
the
s:er 1
s’r
jt
i1ane
energed
at
rateu
vcltiqe
and
the
restraint
taps
set
at
100
percent.
The
units
•
r.r
rTJ-:’ .,.
r
or
to
factory
adjustment
and
if
rechecied
when
col
a
will
tend
to
underreach
by
3
or
4
per
ur
t.
ibratd
meters
are,
of
:ovrse,
esential
to
check
the
fctory
sOttinU Lnd
calibration
by
means
of the
test
described
in the
fol
wit-c
;etion-.
T he
mho
uitc
were
carafully
adjusted
at
the
factory
and
it
is
not
advisable
to disturb
;ese
setiini
r1ecs
the
follewing
checks
indicate
conclusively
that
the
settings
have
been
disturbed.
If
•idjtrnentc
re
necessarY
refer
to
the
section
on SERVICING
for
the
recommended
procedures.
Test connections
for
checking
correct
mho
unit
operation.
(a)
Control
Spring
Adjustment
Re
sure
that
the
relay
is
level
in
its
upright
position.
Leave
the
relay
connected
as
shown
in
Fig.
11
and
leave
the
restraint
taps
in
the
100
percent
position.
9

GEK-45495
Use
the
following
procedure
in
checking
each
unit.
With
the
current set at
five
amperes
and
the
voltage across
relay
voltage
studs
at
120
volts,
set
the
phase
shifter
so
that
the
phase—angle
meter
reads
the
value
shown
in Table
IX
for
the
unit
being
tested,
that
is
so
current
lags
voltage
by
an
angle
equal
to
the
angle
of
maximum torque
of
the
unit.
Now
reduce the
vol
taqe
to
the
low
test
voltage
and
reduce
the
cur
rent
to
dbout
two
amperes.
Gradually
increase
the
current:
until
the
contacts
of
the
unit
just
close.
This
should
occur
between
the
currents
listed
in
Table
IX.
(b)
Clutch
Adjustment
Toe
mho
units
include
a
high-set
clutch
between
the
cup
and
shaft
assembly
and
the
moving
contact
to
prevent
damage
during
heavy
fault
conditions.
These
clutches
have
been
set
at
the factory to
slip
at
approximately
40-60
grads
applied
tangentially
at
the
moving
contact.
This
can
best
be checked in
the
field
ii
terms
of
volt-amperes
by
the
following
method.
ise
the
connections
of
Fig.
11
and set
the
phase
shifter
so
that
the
phase—angle
meter
reads
the
value
in
Table
X
for
the
unit
to
be checked,
at
120 volts
and
5
amperes. Disconnect
the
No.
1 restraint tap
leads
from
the
tap
block
and
set
the
mho
units
for
maximum ohm
basic
minimum
reach.
With
the
voltage
across
relay
studs
set at
120
volt
increase
the
current until
the
clutch
just
slips.
This
should
occur
between 26
and
45
amperes
for
the
3c
unit
or
just
above
52
amperes
for
1
.5s2
unit.
(c)
Ohmic
Reach
With
the
relay
still
connected as
shown
in
Fig.
11
and
the
restraint
tap
leads
in the
100
percent
position,
make
connections
shown
in
Table
X and
set
the
phase
shifter
so
that
the
phase-angle
meter
reads
the
angle
shown
in
the
table
for
the
unit
to
be
checked.
Now
reduce
the
voltage
to the
value
shown
in Table
X and
increase
the
current
gradually
until
the
normally
open
contacts
of the
unit
just
close.
This
should
occur
within
the limits shown.
Note
that
the
tc
screws
on the
transactor
tap blocks
are
set
to
the
position
which
gives
the
basic
minimum
reach
shown
in
the
table.
Note
that
for
the
test
conditions,
the
mho
units
see
a phase-to-phase
fault
of
twice
the
basic
minimum
reach.
The
relays
are
normally shipped
from
the factory
with
the
basic
minimum
reach
adjustment
taps
of
the
units
in the
intermediate
setting,
that
is
the
2
ohm-tap.
If
the
units
are
set
on
either
of
the
remain
ing
basic
minimum reach
taps,
2
or
3
ohms,
the
basic
reach
of
the
units
will
be
within
+4 percent
of
the
nameplate marking.
(d)
Angle
of
Maximum
Torque
For
checking
the
angle
of maximum
torque
the
connections of
Fig.
11
will
be
used
with
the
restraint
tap
leads
set at
100
percent
position,
and with the voltage
set
at
the value
shown
in
Table
XI
for
the
unit
to
be
checked.
The
minimum
reach
taps
should
be
set
to
the
2—ohm
position.
In
ciecking
the
mho
units
the
following
procedure
should
be
used.
First
set
the
phase
shifter
sc
tat
the
phase-angle
meter
reads
330
degrees.
Note
that
while
the
phase
angle
is
being
set,
the
currert
should
he
t
5
mDeres
and
the
voltage
at
120
volts.
Now
set the
voltage
at
the
value
shown
ir
Table
Yl;
1’crease
‘ie
current
s 1 owly
until
the
nho
unit
picks
up.
The
pickup
current
should
be
within
the
1 imits
cnown
in the
table.
:10w
rcset
the
phase
angle
at
270
degrees
and
again
check
the
current
required
to pick
u
the
mhci
unit
Tii
carren:
should
fall
within
the
same
limits
as
for
the
330
degree
check.
Connect
the
relay
as
follows:
__--
CONNECT
LEAU
TO
RELAY
UNIT
..
JUMPER
LOCATION
3T
TUDSA
11)
STUDS
LEAD
A
LEAD
B
LEAD
C
LEAD
D
TOP
l-2
14-15
13—16-17 7
6-8-10
MIDDLE
F-
13-16-17 18-19-20
7
9
6-8-10
bTTl
1L-19-20
l4-15
9
5
6-8-10
in

tEK-45495
TABLE
IX (CONTROL
SPRING
ADJUSTMENT)
PHASE-ANGLE
-
PICKUP
AMPS
LOCAION
METER
SOR
O,5/l.O/L5c2UNIT
l/2/3I2UNIT
SETTING
]iZTAP
22TAP
TOP
3000
1.5
Volts
____
6.0-7.0 —
3.0-3.5
MIDDLE
3000
1.5
Volts
6.0-7.0 3.0-3.5
BOTTOM
300°
1.5
Volts
6.0-7.0 3.0-3.5
TABLE
X
(OHMIC
REACH
ADJUSTMENT)
PHASE-ANGLE
VA-B
SET
AT
PICKUP
LOCATION
METER
O.5/l.O/1.5c1UNIT
l/2/3cUNIT
AMPS
__________
SETTING_—
1
.oc
TAP
2i2
TAP
TOP
300°
—
30
Volts
60
Volts
14.6-15.4
MIDDLE
300°
30
Volts
60
Volts
14.6-15.4
BOTTOM
3000
-
30
Volts
60
Volts
14.6-15.4
TABLE XI
(ANGLE
OF
MAXIMUM TORQUE ADJUSTMENT)
PHASEANGLE
METER
READING
1
VA-H
SET
AT
___
UNIT
ANGLE
OF TEST
ANGLES
5/1/1
.5sz
UNIT
l/2/32
UNIT
AMPS
LO
TION
MAX.
TORQUE
l
TAP
2s
TAP
TOP 3000
2700
and
3300
30
60
_____
16.5-18.5
MIDDLE
3000
270°
and
3300
30
60
16.5-18.5
BOTTOM
3000
2700
and
330°
30
60
16.5-18.5
Note
that
the
two
angles
used
in
the
previous
check, i.e.
330
degrees
and
270
degrees,
are
30
degrees
away
from
the
angle
of
maximum
torque.
An
examination of
the
mho
unit
impedance
characteristic
in
Fig.
6
shows
that
the
ohmic
reach of
the
unit
should
be
the
same
at
both
330
degrees
and
270
degrees
and
should be
0.866 times the
reach
at
the
angle
of
maximum
torque.
ELECTRICAL TESTS
— TARGET
SEAL-IN
The
target
seal-in
unit
either has
an
operating coil
tapped
at
0.6 or 2.0
amperes
or tapped
at
0.2
or
2.0
amperes
depending
on model
ordered.
The
relay
is
shipped
from
the
factory
with
the tap
screw
in
the
lowest
tap
position.
The
operating
point
of
the
seal-in
unit
can be checked
by
connecting
from
d-c
source
(+)
to
stud 11
of
the
relay
and
from
stud
1
through
an
adjustable
resistor
and
an
ammeter
back
to
(-).
Connect
a
jumper
from
stud 12
to
stud
11
also
so
that
the
seal—in
contact
will
protect
the
ruho
unit contacts.
Then
close
the
mho
unit
contact
by
hand
and
increase
the
d—c
current
until
the
seal-in
unit
operates.
It
should pick
up
at
tap
value
or
slightly
lower.
Do
not
attempt
to
interrupt
the d-c
current
by
means
of the
reho
contacts.
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
drilling
dimensions
are
shown
in
Fig.
16.
11

GEK
45495
CONNECTIONS
The
internal
connections
of
the
CEY52B
relay
are
shown
in Fig.
10.
An
elementary
diagram
of
typical
external
connections
is
shown
in
Fig.
4.
VISJL
INSPECTION
Remove
the
relay
from
its
case
and
check
that
there
are
no
broken
or
cracked
component
parts
and
that
all
screws
are
tight.
MECHANiCAL
INSPECTION
Recheck
the
six
adjustments
mentioned
under
Mechanical
Inspection
in
the
section
on
ACCEPTANCE
TESTS.
PORTABLE
TEST
EQUIPMENT
To
eliminate
the
errors
which
may
result
from
instrument
inaccuracies
and
to
permit
testing
the
mho
units
from
a
single-phase
a-c
test
source,
the
test
circuit
shown
in schematic
form
in
Fig.
13
is
recom
mended.
In
this
figure
RS
+
jX 5
is
the
source
impedance, SF
iS the
fault
switch,
and
RL
+
jXL
is
the
impedance
of
the
line
section
for
which
the
relay
is
being
tested.
The
autotransformer
TA,
which
is
across
the
fault
switch
and
line
impedance,
is
tapped
in
10 percent
dnd
1
percent
steps
so
that
the
line
impedance
RL
+
jX[
may
be
made
to
appear
to the
relay
very
nearly
as
the
actual
line
on
which
the
relay
is to
be
used.
This
is necessary since
it
is not
feasible
to
provide
the
portable
test
reactor
XL
and
the
test
resistor
with
enough
taps
so
that
the combination
may
be made
to
match
any
line.
Fo
convenience
in
field
testing,
the
fault
switch
and
tapped
autotransformer
of
Fig.
13
have
been
arranged
ri
a
portable
test
box,
Cat.
No.
lO2L2Ol, which
is particularly
adapted
for
testing
directional
and
distaece
relays.
The
box
is
provided
with
terminals
to
which
the
relay
current
and
potential
circuits
as
well
as
the
line
and
source
impedances
may
be
readily
connecd.
For a
complete
description
of
the
test
box
the
user
is referred
to
GEI—38977.
ELECTRLAL
TESTS
ON THE
MHO
UNITS
The
manner
in
which
reach
settings
are
made
for
tae
mho
units is
briefly
discussed
in the
CALCULATION
OF SETTINGS
section.
Examples
of calculations
for
typical
settings
are
given
in
that
section.
It
is
the
purpose
of
the
electrical
tests
in
this
section
to
check
the
ohmic
pickup
of
the
mho
units
at
the
settings
which
have
been
made
for
a
particular
line
section.
To
check
the
calibration
of
the
mho
units,
it
is
suggested
that
the
portable
test
box,
Cat.
No.
102L201;
portable
test
reactor,
Cat.
No.
6054975;
and
test
resistor,
Cat.
No.
6158546
be
arranged
with
Type
XLA
test
plugs
according
to
Fig.
14.
These
connections
of
the
test
box
and
other
equipment
are
similar
to the
sche
matic
connections
shown
in
Fig.
13
except
that
the type
XLA
test
plug
connections
are
now
included.
Use
of the
source
iinpedanceR 5
÷
jX 5 ,
simulating
the
conditions
which
would
be
encountered
in
practice,
is necessary
only
if the
relay is
to
be
tested
for
overreach
or
contact
coordination,
tests
which
are
not
normally
considered necessary
at
the
time
of
installation
or
during
periodic
testing.
Some
impedance
will
.isually
be
necessary
in
the source connection
to
limit
current
in
the
fault
circuit
to
a
reasonable
value,
especially
when
a
unit
with
short
reach
setting
is to
be
checked,
and
it
is
suggested
that
a
reactor
of
suitable
value
be used
for
this
purpose
since
this
will
tend
to
limit
harmonics
in
the
fault
current.
Since
the
reactance
of
the
test
reactor
may
be
very
accurately
determined
from
its
calibration
curve,
it
i
desirable
to
check
mho
unit
pickup
with
the
fault
reactor
alone,
due
account
being
taken
of
the
angular
difference
between
the
line
reactance,
XL,
and
mho
unit
angle
of
maximum
reach.
The
line
reactance,
XL,
selected
should
be
the
test
reactor
tap
nearest
above
twice the
mho
unit
phase-to-neutral
reach
with
account
being
taken
of tie
difference
in
angle
of
the
test
reactor
tap
impedance
and
the
unit
angle of
maximum
reach.
From
Fig.
12
it is
seen
that
twice
the
relay
reach
of
the
angle
of the
test
reactor
impedance
is:
22
Relay
200
Tap
Setting
%
Cos
(0—0)
where:
0=
the
angle of
the
test
reactor
impedance
9=
mho
unit
angle
of maximum
reach
Z
Mm.
=
basic
minimum
reach
of
mho
units
To
illustrete
by
an
example
let
us
consider
the
percent
tap
required
on
the
test
box
autotransformer
for
unit
that
has
been
factory
adjusted
to
pickup
at
three
ohms
minimum
and
at
a
maximum
torque
angle
of
12

GEK-45495
60 degrees.
In
determining
the
reactor
tap
setting
to
use,
it
nay
be
assumed
that
the
angle
(0)
of
th
te’. reactor
impedance
is
8’)
deos.
From
the
above,
twice
the
relay
reach
at
the
angle
of
the
test-reactor
impedance
is:
2Z
relay
=
200X
cos
(80-60)
=
5.64
ohms
Therefore,
use
the
reactor
6-ohm
tap.
Twice
the
relay
reach
at
the
angle
of
test
reactor
impedance
should
be
recalculated
using
the
actual
angle
of
the
reactor
tap
impedance
rather
than
the
assumed
80
degrees.
The
table
b.
ow
shows
the angles
for
each
of
the
reactor
taps.
TAP
ANGLE COS
0-60
24
88
0.883
12 87
0.891
6
86
0.899
3
85
0.906
2
83
0.921
81
0.934
0.5
78
0.951
From
the
above
table
it
is
seen
that
the
angle
of
the
impedance
of
the
6-ohm
tap
is
86
degrees.
There fore,
2Z
relay
=
200X
cos
(86-60)
=
5.4
ohms
The
calibration
curve
for
the
portable
test
reactor
should
again
be
referred
to in
order
to
determine
the
exact
reactance
of
the
6-ohm
tap
at
the
current
level
being
used.
For
the
purpose
of
this
illustration assume
that
the
reactance
is
6.1
ohms.
Since the
angle
of
the
impedance
of
the
6-ohm
tap
is
86
degrees,
the
impedance
of
this
tap
may
be
calculated
as
follows:
-
XL
-
6.1
-
6 115
ZL
-
sin
86
.9976
-
From
this calculation
it is
seen
that
the
reactance
and
the
impedance
may
be
assumed
the
same
for
this
particular
reactor
tap.
Actually
the
difference
need
only
be
taken
into
account
on
the
reactor
3-,
2-,
1-
and
0.5-ohm
taps.
The
test
box
autotransforrner
tap
setting
required
to close
the
mho-unit
contacts
with
the
fault
switch
closed
is:
%
=---
(100)
=
88.5%
(use
88%
Tap)
Ficj.
13
should
be
checked
to
determine
that
the
test
current
used
is
high
enough
so
that
the
character
istic
is
not
off
the
calculated
value
because
of
low
current.
If
the
ohmic
pickup
of the
mho
unit
checks
correctly
according
to the
above,
the
chances
are
that
the
angle of the
characteristic
is
correct.
The
angle
may,
however,
be
very
easily
checked
by
using
the
cali
brated
test
resistor
in
combination
with
various
reactor
taps.
The
calibrated
test
resistor
taps
are
pre-set
in
such
a
manner
that
when
used
with
12-
and 6-ohm
taps
of
the
specified
test
reactor,
impedances
at
60 degrees
and
30
degrees
respectively
will
be
available
for
checking
the
rnho
unit
reach
at
the
60 degree
and
30 ‘legree
positions.
The
inho
unit
ohmic
reach
at
the
zero-degree
position
may
be
checked
by
using
the
cali
bra
ed
test
resistor
alone
as the
line
impedance.
The
calibrated
test
resistor
is
supplied
with
a
data
sheet
which
‘ives
the
exact
impedance
and
angle
for
each
of
the
combinations
available.
The
test-box
autotrans
former
percent
tap
for
pickup
at
a
particular
angle
is
given
by:
%
Tap
where
9 is
the
angle of
maximum
torque of
the
unit,
0
is
the
angle
of
the
test
impedance
(ZL),
Z
is
the
60-
degree,
30-degree
or
zero-degree
impedance
value
taken
from
the
calibrated
resistor
data
sheet.
As
in
the
case
of
the
previous
tests,
the
load
box
which
serves
as
source
impedance
should
be
adjusted
to
allow
approxi
mately
10
amperes
to
flow
in
the
fault circuit
when
the
fault
switch
is
closed.
13

GEK-4 5495
When
checking
the
mho
unit
at
angles
of
more
than
30
degrees
off
the
maximum
reach
position,
the
error
becomes
relatively
large
with
phase-angle
error.
This
is
apparent
from
Fig.
12
where
it
is
seen, for
example,
at
the
zero-degree
position
that
a two
or
three degree
error
in
phase
angle
will cause
a
considerably
apparent
error
in
reach.
INSPECTION
Before
placing
a relay
into
service,
the
following
mechanical
adjustments
should
be
checked,
The
armature
and
contacts
of
the
target
and
seal-in
units
should
operate
by
hand.
There
should
be
a
screw
in
only
one
of
the
taps
on
the
right-hand
contact
of
the
target and
seal-in
uni
ts.
The
target
should
reset
promptly
when
the
reset
button
at
the
bottom
of the
cover is
operated,
with
the
cover
on
the
relay.
MHO
UNITS
There
should
be
no
noti
ceable
fri
ction
in
the
rotating
structure
of
the
mho
unit.
The inho
unit
moving
contact
should
just
return
to
the
backstop
when
the
relay
is
de-energized,
and
in
the
vertical
position.
There
should
be
approximately
.010-015
inch
end
play in
the
shafts
of
the
rotating
structures.
The
lower
jewel
screw
bearing
should
be
screwed
firmly
into
place,
and
the
top
pivot
locked
in
place
by
its
set
screw.
If there
is
reason
to
believe
that
the jewel
is
cracked or
dirty
the
screw
assembly
can
be
removed from
the bottom
of
the
unit
and
examined.
When
replacing
a
jewel,
have
the
top
pivot
in
the
shaft
while
screwing
in
the
jewel screw.
All
nuts
and
screws
should
be
tight,
with
particular
attention
paid
to
the tap
plugs.
The
felt gasket
on
the
cover
should be
securely
cemented
in
place in
order
to
keep
Out
dust.
Determine
the
impedance
and
phase
angle
seen
by
the
relays.
Knowing
the
impedance
and
phase
angle
seen
by
the
relay,
the tap
value
at
which
the
relay
will
just
operate
can
be
calculated.
It
is
then
only neces
sary
to reduce the
tap
setting
of
the relay
until
the
mho
units
operate
and
see
how
close
the
actual
tap
value
found
checks
with
the
calculated
value.
The
calculated
value
should
take
into
account
the
shorter
reach of
the
mho
unit
at
low
currents.
This
effect
is
shown
in
Fig.
8.
A
shorter
test
which
will
check
for
most
of
the
possible
open
circuits
in
the a-c
portion
of
the
relay
can be
accomplished
by
disconnecting
the
current
circuits.
This
can
be
done
by
removing
the
lower
connection
plug.
All
units
should
have
strong
torque
to the
right when
full
voltage
is
applied.
Replace the
lower plug
and open
the
restraint
taps. All
units
should
operate
if
power and
reactive
flow
are
away
from
the
station
bus
and
into the
protected
line section.
If
the direction
of
reactive
power
flow
is
into
the
station
bus,
the
resultant
phase
angle
may
be
such
that the
units
will
not operate.
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
will
vary
depending
upon
environment,
type
of
relay and
the
users
experience
with
periodic
testing.
until
the
user
as
accumulated
enough
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
yea
rs.
CONTACT
CLEANING
For
cleaning
fine
silver
contacts,
a flexible
burnishing
tool
should
be
used.
This
consists
of
a
flexi
ble
strip
of
metal
with
an
etched—roughened
surface
resembling
in
effect
a
superfine
file.
The
polishing
acton
is
so
delicate
that
no
scratches
are
left,
yet
it
will
clean
off
any
corrosion
thoroughly
and
rapidly.
Its
flexibility
insures
the
cleaning
of the
actual points
of
contact.
Do
not
use knives,
files,
abrasive
oaper
or
cloth
of
any
kind
to
clean
relay
contacts.
14

GEK-4
5495
SERVICING
If
it
is
found
during
the
installation
or
periodic
tests
that
the
niho
unit
calibrations
are
out
of
liniits,
they
should
be
recalibrated
as
outlined
in the
following
paragraphs.
It
is
suggested
that
these
calibrations
be
made
in
the
laboratory.
The
circuit
components
listed
below,
which
are
normally
considered
as
factory
adjustments,
are
used
in
recalibrating
the
units.
These
parts
may
be
physically
located
from
Fig.
1
and
2.
Their
locations
in
the
relay
circuit
are
shown
in
the
internal
connection
diagrams
of
Fig.
10.
-
l-2
unit
r’hmic
reach
adjustment
R 21
-
unit
angle
of
maximum
torque
adjustment
R 12
-
2-3
unit
ohmic
reach
adjustment
R 22
-
unit
angle
of
maximum
torque
adjustment
R 13
—
3-l
unit
ohmic
reach
adjustment
R 23
-
unit
angle
of
maximum
torque
adjustment
NOTE:
Before
making
pickup
or
phase-angle
adjustments
on
the
mho
Units,
the
units
should
be
allowed
to
heat
up
for
approximately
15
minutes
energized
with
rated
voltage
alone
and
the
restraint
taps
lead
set
for
100
percent.
Also
it
is
important
that
the
relay
be
mounted
in
an
upright
position
so
that
the
units
are
level.
a.
Control Spring
Adjustment
Make
connections
to
the
relay
as
shown
in
Fig.
11
and
set
the
restraint
tap
leads
on
100
percent.
The
basic
reach
taps
should
be
set
in
the
position for
the
basic
niinimuni
reach
shown
in
Table
XII.
Make
sure
that
the
relay
is
in
an
upright
position
so
that
the
units
are
level.
With
the
current
set at
5
amperes
and
the
voltage
VA_B
at
120
volts,
set
phase
shifter
so
that
the
phase-angle
meter
reads the
value
shown
in
Table XII.
Now
reduce
the
voltage
to
the
test
voltage
value
and
set
the
current
at
the
value
shown
in
Table
XII
for
the
unit
being
adjusted.
Insert
the
blade
of
a thin
screwdriver
into
one
of
the
slots
in
the
edge
of
the
spring
adjusting
ring
(see
Fig.
15)
and
turn
the
ring
until
the
contacts
of
the
unit
just
close.
If
the
con
tacts
were
closing
below
the
set
point
shown
in
Table
XII,
the
adjusting
ring
should
be
turned
to the
right.
If
they
were
closing
above
the
set
point,
the
adjusting
ring
should
be
turned
to
the
left.
b.
Ohmic
Reach
Adjustment
The
basic
minimum
reach of
the
mho
units
can
be
adjusted
by
means
of
the
rheostats
which
are
accessible
from
the
front
of
the
relay.
Connect
the
relay
as
shown
in
Fig.
11;
leave
the
restraint
taps
at
100
percent
and
be
sure
that
the
basic
minimum
reach
taps
are
in
the
position
shown
in
Table
XIII.
With
current
at
5
amperes,
and
voltage
at
120
volts
set
the
phase
shifter
so
that
the
phase-angle
meter
reads
the angle
shown
in
the
table
for
the
unit
to
be
checked.
Now
reduce
the
voltage
VAB
to
the
set
value
shown
in
Table XIII
and
adjust
the
appropriate
rheostat
so
that
the
unit
picks
up
at
15
amperes
+5
percent.
c.
Angle
of
Maximum
Torque
The
angle
of
maximum
torque
of
the
mho
units
can
be
adjusted
by
means
of
rheostats
which
are
accessible
from
the
front
of
the
relay.
Use
the
connections
in
Fig.
11.
Leave
the
restraint
taps
to
100
percent
and
be
sure
that
the
basic
minimum
reach
taps
are
in
the
position
shown
in
Table
XIV.
The
procedure
used
in
setting
angle
of
maximum
torque
is
to
adjust
the
reactor
so
that
the
pickup
aniperes,
at
a
specified
set
voltage
VAB,
will
be
the
same
at
angles
leading
and lagging
the
maximum
torque
angle
by
30
degrees.
The
test
angles,
set
voltages,
and
the
pickup
amperes
are
shown
in
Table
XIV.
First,
the
reach
of
the
unit
at
its
angle
of
maximum
torque
should
be
checked
and
adjusted
if
necessary
as
described
in paragraph
(b)
and
Table
XIV.
Next
set
the
phase
shifter
so
that
the
phase-angle
meter
reads
330
degrees
(Note
that
phase-angle adjustments
should
be
made
at
120
volts
and
5
amperes).
Then
set
VAB
at
test
volts
and
adjust
the
proper
reactor
so
that
the
ohm
unit
closes
its
contacts
at
17.3
amperes
+5
percent.
The
pickup
should
then
be
checked
at
270
degrees
with
the
same
set
voltage
and
should
be
17.3
amperes +5
per
cent.
Refine the
adjustments
of
rheostats
until
the
pickup
is
within
limits
at
both
270
degrees
and
330
degrees.
15

GLK-45495
Note
that
an
adjustment
of
the
ange of
maximum
torque will
have
a
secondary
effect
on
the
reach
of
the
unit, and
vice-versa.
Therefore,
to
insure
accurate
settings,
it
is
necessary
to
recheck
the reach
of
a
unit
whenever
its
angle of maximum
torque
settinc
is
changed,
and to
continue
a
cross
adjustment
routine
of
reach
and
angle of
maximum torque
until
both
are within
the
limits specified
above.
Connect
the
relay
as
follows:
CONNECT LEAD
TO
RELAY
LOCATION UNIT
STUDS
AS_FOLLOWS
(SEE
FIG.
11)
JUMPER
L[AD
A
LEAD
B
LEAD
C
LEAD
D
TOP
L
;l-2
14-15
13-16—17
5
7 6-8-10
MIDDLE
2-3
13-16-17
18-19-20
7
9
6-8-10
BOTTOM
‘3-l
18-19-20
14-15
9
5
6-8-10
TABLE
XII
PHASE-ANGLE
PICKUP
AMPS
(±10%)
METER
O.5/l.O/l.5c2UNIT
l/2/3c2UNIT
LOiiuN
SETTING
JL1
l
TAP
2c2
TAP
TOP
3000
1.5
Volts
6.5
Amp
3.25
Amp
MIDDLE
3000
1.5
Volts
6.5
Amp
3.25
Amp
r
BOTTOM
3000
—
L5Volts
6.5
Amp
3.25
Amp
TABLE
XIII
PHASE-ANGLE
VA-B SET
AT
PICKUP
—______
UNIT
METER
0.5/1.0/l.5i2UNIT
l/2/3c2UNIT
AMPS
ADJUST
LOCATION
SETTING
l.O2TAP
2c2TAP
4-5%
TOP
3000
30
Volts
60
Volts
15 Rh
MIDDLE
300°
30
Volts
60
Volts
15
R12
BOTTOM
300°
30
Vol
ts
60
Vol
ts 15 Rl
3
TABLE
XIV
PHASE-ANGLE
METER
READING
VA-B
SET
AT
PICKUP
F
UNIT
ANGLE
OF
TEST
ANGLES
.5/lf1.5c2
UNIT
h/2/3c!UNIT
AMPS
ADJUST
LOCATION
MAX.
TORQUE
lc
TAP
2
TAP
+5%
TOP
300°
270°
and
33Q0
30
60
17.3 R21
MIDDLE
300° 270°
and
330°
30
60
17.3 R22
Lz
300°
270°
and
330°
30
60
17.3 R23
As
noted
in
Table
II
under
the
section
on
RATINGS,
the
angle
of
maximum
torque
of the
mho
units
can
be
adiusted
up
to
75
degrees if
desired.
If
this
change
is
made,
the
reach
of
the
niho
units
will
increase
slightly.
To
make
this adjustment
refer
to
Table
XV
and
proceed
as
outlined
below.
With
restraint
tap
settings at
100
percent
and
connections
per
Fig.
11,
set
the
phase
shifter so
that
the
phase-angle
meter
reads
315
degrees,
set
VAB
to
test
volts
and
the
current
to
12.5
amperes.
Now
adjust
the
proper
rheostat
so
that
the
unit just
picks
up.
Now
check
the
pickup
current
at
255
degrees.
The
pickup
current
at
both
test
angles
should
be
within
±5
percent of
the
value
listed in
the
table.
After
the
setting
is
made make
sure
the
rheostat
lock
nuts
are
tight.
16

GEK-4
5495
TABLE
XV
0
ANGLE
METER
READS
VA_B_SET PICKUP
UNIT
AT
MAX
O.5/l.0/1.5c2
UNIT
l/2/3&2
UNIT
AMPS
ADJUST
LOCATION
TORQUE
TEST
ANGLES
ls TAP
2m TAP
+5f
TOP
285°
255°
1
3150
30
Volts
60
Volts
14.4
R21
MIDDLE
285°
255°
j
315°
30 Volts
60
Volts
14.4
R22
BOTTOM
285°
25I15°
30
Volts
60
Volts
14.4
R23
d.
Core
Adjustment
(See
Fig.
17)
This
adjustment
is
to be
made
only
if
relay
does
not
meet
Directional
Tests.
By
means
of
a
special
wrrnch
(catalog
no.
0178A9455
Pt.
1)
the
core
is adjusted
by
inserting
the
wrench
to
engage
nut
“0”
which
rotates
the
core
“A’
to obtain
the values
shown
under
Directional
Tests.
The
core
may
be
rotated
360
degrees
in
either
direction
although
it
should
not
be
necessary
to
rotate
the
core
more
than
a few
degrees
from
its
set
position.
RENEWAL
PARTS
It ii
reconinended
that
sufficient
quantities
of
renewal
parts
be
carried
in
stock
to
enable
the
prompt
rep’acement
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
give
the
General
Electric
Requisition
number
on
which
the
relay
was
furnished.
17

GEK-45
495
TARGET
SEAL-IN
UNIT
Ru
UPPER TAP
BLOCK
RESTRAINT
TAPS
R21
MHO
UNIT
—
c
2-3
RT3
R23
LOWER
TAP
BLOCK
RESTRAINT
TAPS
MHO UNIT
3-1
PIG.
I
(8036590)
MHO
DISTANCE
RELAY
REMOVED
FROM
CASE, FRONT
VIEW
I
MHO UNIT
c
-2
18

‘ E
K
-45495
“I
c1
1-2
________
TAP
BLOCK
BASIC
MIN.
REACH
f
2-3
TAP
BLOCK—
BASIC
MIN.
REACH
TAP
BLOCK
BASiC
MIN.
REACH
FIG.
2
8O428O7)
MHO
DISTANCE
RELAY REMOVED
FROM
CASE,
REAR
VIEW
19

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a
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m
m
a a
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a -I
rn
C-) r’l
-C
F’,)
r’l
STATIC
AND
DYNAMIC
ACCURACY
OF
TYPE
CEY52B
MHO
UNIT
AT
ANGLE
OF
‘,AAXIMUM
TOR2UE
(600
LA.G)
STATIC
CHARACtER
1ST-IC
DYNAMIC
CHARACTERISTIC
I
m
U
U,
I3
*
ZMNIMUM