GE JBCV51M User manual

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DESCRIPTION
.
APPLICATION
RATINGS
TIME
OVERCURRENT
UNIT
INSTANTANEOUS
OVERCURRENT
UNIT
(DIRECTIONALLY
CONTROLLED)
DIRECTIONAL
UNIT
INSTANTANEOUS
UNT
(NON-DIRECTIONALLY
CONTROLLED)
TARGET
AND
SEAL-IN
UNITS
CONTACTS
OPERATING
CHARACTERISTICS
PICKUP
RESET
(Tune
Overcurrent
Urift)
OPERATING TIME
BURDENS
CONSTRUCTION
DIRECTIONAL UNIT
LOW
GRADIENT
CONTACT
BARREL CONTACT
TIME OVERCURRENT
UNIT
TARGET
AND
SEAL-IN
UNITS
INSTANTANEOUS
OVERCURRENT
UNIT
(DIRECTIONALLY
CONTROLLED)
INSTANTANEOUS
UNIT
(NON-DIRECTIONALLY
CONTROLLED)
RECEIVING,
HANDLING
AND
STORAGE
ACCEPTANCE
TESTS
VISUAL
INSPECTION
MECHANICAL
INSPECTION
TOP
UNIT
(bc)
MIDDLE
UNIT
(TOC)
BOTTOM UNIT
(DIR)
TARGET
AND
SEAL-IN
UNITS/
INSTANTANEOUS
UNIT
DRAWOUT
RELAYS GENERAL
POWER REQUIREMENTS
GENERAL
TARGET
AND SEAL-IN
UNITS
PICKUP
AND
DROPOUT
TEST
TIME
OVERCURRENT
UNIT
CURRENT
SETTING
TIME
SETTING
PICKUP
TEST
TIME
TEST
DIRECTIONAL
UNIT
POLARITY
CHECK
INSTANTANEOUS
UNIT
(DIRECTIONALLY
CONTROLLED)
PICKUP
SETTING
GEK—4985O
CONTENTS
PAGE
3
INSTANTANEOUS
UNIT (NON-DIRECTIONALLY
4
CONTROLLED)
5 INSTALLATION
5
LOCATION
MOUNTING
5
CONNECTIONS
6
INSPECTION
CAUTION
6
OPERATION
6
TARGET
AND
SEAL-IN
UNITS
7
TIME
OVERCURRENT
UNIT
7
DIRECTIONAL
UNIT
7
INSTANTANEOUS
OVERCURRENT
UNIT
7
(DIRECTIONALLY
CONTROLLED)
7
INSTANTANEOUS
UNIT (NON-DIRECTIONALLY
7
CONTROLLED)
9
PERIODIC
CHECKS
AND
ROUTINE
9
MAINTENANCE
9
TARGET
AND
SEAL-IN UNITS
9
TIME
OVERCURRENT UNIT
10
DIRECTIONAL
UNIT
10
INSTANTANEOUS
OVERCURRENT
UNIT
(DIRECTIONALLY
CONTROLLED)
10
INSTANTANEOUS
UNIT (NON-DIRECTIONALLY
CONTROLLED)
11
SERVICING
11
TARGET
AND
SEAL—IN
UNITS
11
TIME
OVERCURRENT
UNIT
11
DISK
AND
BEARINGS
11
CONTACT
ADJUSTMENT
11
CHARACTERISTICS
CHECK
AND
11
ADJUSTMENTS
12
DIRECTIONAL
UNIT
BEARINGS
12
CUP
AND
STATOR
12
CONTACT
ADJUSTMENTS
12
BIAS
TORQUE
ADJUSTMENT
12
CLUTCH
ADJUSTMENT
12
INSTANTANEOUS
OVERCURRENT
UNIT
13
(DIRECTIONALLY
CONTROLLED)
13
BEARINGS
13
CUP
AND
STATOR
14
CONTACT
ADJUSTMENTS
14
CLUTCH
ADJUSTMENT
14
INSTANTANEOUS
UNIT
(NON—DIRECTIONALLY
14
CONTROLLED)
CONTACT
CLEANING
14
RENEWAL
PARTS
14
15
15
15
15
15
15
15
15
15
16
16
16
16
16
16
16
16
16
16
17
17
17
17
17
17
17
17
17
18
18
19
19
19
19
19
19
19
20
20
2

GEK-49850
PHASE
DIRECTIONAL
OVERCURRENT
RELAYS
WITH
VOLTAGE
RESTRAINT
TYPES JBCV51M
JBCV
5314
JBCV53M(-
)Y1A
JBCV77M
DESCRIPTION
The
Type
JBCV
relays
are
phase
directional
overcurrent relays
with
voltage
restraint.
They
are
used
primarily for
the
protection of
feeders
and
transmission
lines.
They
are
available
with
inverse,
very
inverse
or extremely inverse
time
characteristics.
All
the
JBC
relays
contain
a
time
overcurrent
unit
of the
induction
disk type,
an
instantaneous
over-
current
cup
type
unit
and
an instantaneous
directional
cup
type
unit.
The
directional
unit
is quadrature
polarized
and
it directionally
controls
the
operation
of the
time
overcurrent
and
the
instantaneous
over—
current
units. Because
the
directional unit
is
voltage
restrained,
the
JBCV
relays
are
suitable
for
use
in those
applications
where
the
maximum
load
current
can
be
greater
than
the
minimum
available
fault
cur
rent.
Two
target
seal-in
units
are
provided
in
each
of
the
relays.
The
operating
coil
of each
of
these
units
respectively
is
connected
in
series
with the
contacts
of
the
time
overcurrent
unit
and
the
instantaneous
overcurrent
unit.
The
contacts
of each
seal—in
unit
respectively
are
connected
in parallel
with
the
con
tacts
of
the
time
overcurrent
unit
and
the
instantaneous overcurrent
unit
to provide
protection
for
them
and
the
associated control
spring.
Those
relays
having
the
designation
ViA
following the
model
number
also
‘contain
a
Hi—Seismic
instan
taneous
unit
of
hinged
armature
construction.
This
unit
is non—directional
and
has
a self-contained
hand
reset
target that
will
show
whenever the
unit
has
operated.
All
the
JBCV
relays
are
mounted
in
standard ill
size
drawout
cases;
the
outline
and
panel
drilling
dimensions
for
which
are shown
in
Fig.
24.
Internal
connections for
the relays
are
shown
in
Fig.
5,
6
and 7.
Typical external
connections
are
shown
by
Figs.
8
and 9.
Table
I below
lists
the
various models
and
ranges
that
are
available.
TABLE
I
EXTENDED
RANGE
JBCV
RELAYS
Relay
Time
Hi-
Pickup
Range
Int.
Model
Characteristic
Seismic
Hi—Seismic
Time Inst.
Cup
Conn.
JBCV51M(-)A
Inverse
No
-
-
2-16
2—16,
10—80
Fig.
5
JBCV53M(-)A
Very
Inverse
No
-
1.5-12 2-16,
10-80
Fig.
5
JI3CV53M(-)Y1A
Very
Inverse
Yes
6—150 1.5—12
2—16
Fig.
6
JBCV77M(-)A
Extremely
mv.
No
-
1.5-12
2-16,
10—80
Fig.
7
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
to
provide
for
every
possible
contingency
to
be
met
in
connection
with
installation,
operation
or
maintenance.
Should
further
information
be
desired
or
should
particular
problen’s
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
NEM.4
standards;
but
not
such
assurance
is
given with
respect
to local
codes
and
ordinances
because
they
vary
greatly.
3

GEK-49850
APPLICATION
The
Type
JBCV
relays
are
phase
directional
overcurrent
relays
that
are
used
primarily
as
phase fault
detectors
in
transmission
line
or
feeder
protective
relaying
schemes.
JBCV
relays are
used
for
phase
fault
protection
when
it
is
‘rcessary
to
distinguish
between fault
conditions
and
maximum
load.
The
relay
is
prevented
from
trippg
on
heavy
load
currents
because
the
directional
unit
will
be restrained
due
to
the
system
voltage being
maintained.
When
a
fault
occurs,
the
restraining
torque
in
the
directional
unit
will
collapse as
the
voltage
drops,
thus
permitting
the
relay
to
trip
even
at
fault
currents
below
the
maximum
load
current.
Each
relay
contains a
time
overcurrent
unit
and
an
instantaneous
overcurrent
unit
that
are
both
torque
controlled
by
the
instantaneous
directional unit.
The
directional
unit
is
quadrature
polarized;
i.e.,
the
“a’
phase
relay
uses
‘a”
phase
current and
‘b—c”
voltage,
etc. The
angle
of
maximum
torque of
the
direc
tional unit
is
approximately
45
degrees;
i.e.,
maximum
torque
will
occur
for relay
current
lagging
the
unity
power
factor
position
by 45
degrees, or
conversely,
leading
the
quadrature voltage
by 45
degrees.
The
differences
between
the various
models
covered
by
this
instruction
book
are
shown
in
Table
I.
Inverse
time
relays should
be
used
on
systems
where
the
fault
current
flowing
through
a
given
relay
is
influenced
largely
by
the
system
generating capacity
at
the
time
of
the
fault.
Very
inverse
time
and
ex
tremely
inverse
time
relays
should
be
used
in cases
where
the
fault
current
magnitude
is
dependent mainly
upon
the
location
of
the
fault
in
relation
to
the
relay,
and
only
slightly
or
not
at
all
upon
the
system
generating
setup.
The
reason
for
this
is
that
relays
must
be
set
to
be
selective
with
maximum
fault cur
rent
flowing.
For
fault
currents
below
this
value,
the
operating
time
becomes
greater
as
the
current is
decreased.
If
there is
a
wide
range
in
generating
capacity,
together
with
variation
in
short-circuit
current
with
fault
position,
the
operating
time
with
minimum
fault
current may
be
exceedingly
long
with
very
inverse
time
relays
and
even
longer with
extremely
inverse
time
relays.
For
such
cases,
the
inverse
time
relay is
more
applicable.
The
choice
between
very
inverse
and
extremely
inverse
time
relays
is
more
limited
than
between
them
and
the
inverse time
relay
as
they
are
more
nearly
alike
in
their
time—current
characteristic
curves.
For
grading
with
fuses
the
extremely
inverse time
relay should
be
chosen
as
the
time—current
curves
more
nearly match
the
fuse
curve.
Another advantage
of
the
extremely
inverse
relay
is
that
it
is
better
suited
than both
the
inverse and
very
inverse
relays
for
picking
up
cold
load.
For
any
given cold
load
pickup
capability,
the
resulting
settings
will
provide
faster
protection
at
high
fault
currents
with
the
extremely
inverse
relay
than with the
less
inverse
relays.
The
operating
time of
the
time
overcurrent
unit
for
any
given
value
of
current
and
tap
setting
is
de
termined
by
the
time
dial
setting. This
operating
time
is
inversely
proportional
to
the
current
magnitude
as
illustrated
by
the
time
curves
in
Figs.
11,
12
and 13.
Note
that
the
current
values
on
these
curves
are
given
as
multiples
of the
tap
setting. That
is,
for
a
given
time
dial
setting,
the
time
will
be
the
same
for
80 amperes
on
the
eight
ampere tap
as
for
50
amperes
on
the
five
ampere
tap,
since
in
both
cases,
the
current
is
ten
times
tap
setting.
If
selective
action of
two
or
more
relays is
required,
determine
the
maximum
possible
short-circuit
current
of
the
line
and
then
choose a
time
value
for
each
relay
that
differs
sufficiently
to
insure the
proper
sequence in
the
operation
of
the
several
circuit
breakers.
Allowance
must
be made
for
the
time
involved
in
opening
each
breaker
after
the
relay
contacts
close.
The
instantaneous
cup
unit
is
torque
controlled
by
the
directional
unit.
When
it
is
used
for
direct
tripping,
it
will
only
be
necessary
when
determining
a setting
to
consider
the
maximum
current
that
the
instantaneous
unit
will
see
for
a
fault
at
the
remote
terminal.
The
instantaneous
cup
unit
has
low
tran
sient
overreach.
It
should
be
set
with
a
margin
of
at
least
10
percent above
the
maximum current for
a
remote fault
neglecting transient
overreach.
The
‘(lA
relays
contain
a
Hi-Seismic
instantaneous
overcurrent
unit.
This
unit
may
be
set
high
to
pro
vide
direct
tripping for
heavy
internal
faults.
In
determining the
setting for
this
unit
when
it
is
used
for
direct
tripping,
it
will
be
necessary
to
consider
the
maximum
external
fault
for
faults at
each
end
of
the
line
because
the
unit
is
non-directional.
The
unit
should
be
set
with
a suitable
margin
above
the
maximum
external
fault
taking
into
account
the
effects
of
transient
overreach
as
illustrated
in
Fig.
16.
The
red
jumper
leads
between
studs
18
and
19
and
19
and
20
are
located
inside
the
case
on
the
cradle
block
and
may
be
removed
to
provide
external
torque
control
of
the
time
overcurrent
unit
(TOC)
and
the
instantaneous
overcurrent
unit
(bc)
respectively.
If
external
torque
control of
either
or both
units
is
4

GEK-49850
required,
remove
the
red
Jumper
lead
associated
with the
unit(s)
to
be
controlled,
and
connect
the external
control
contacts
between
the
appropriate studs.
Note
that
the
units
will
still
be
torque
controlled
by
the
directional
unit
in
addition
to
the
external
control.
RAT
INOS
Ratings
of
the
operating
current
circuits
of
the
TOC
(time
overcurrent),
directional
controlled
IOC
(instantaneous overcurrent)
and
the
directional
units
are
shown
individually.
However,
since
all
operating
current
circuits
are
normally connected
in
series,
the
operating
coil
ratings
of
all
three units
should
be
considered
in
determining
the
rating
of the
entire operating
circuit.
TIME OVERCURRENT
UNIT
The
one second
ratings
of
the
TOC units,
relay
terminals
2
and
4,
are
all
260
amperes.
taps
and
the continuous
ratings
are
shown
in
Tables
2,
3
and 4.
Note
that
separate
tables
the JBCV51,
JBCV53 and
JBCV77
models.
TABLE
2
The
available
are
given for
CONTINUOUS
RATING
OF
INVERSE
TIME
OVERCURRENT
UNIT
CONTINUOUS
RATING
OF
EXTREMELY
INVERSE
TIME
OVERCURRENT
UNIT
1.5
—
12.0 AMP
RANGE JBCV77
J
TAP
1.5
2.0
2.5
3.0
4.0 5.0
6.0
7.0
8.0
10.0
12.01
RATING
9.5
10.5
11.5
12.5 14.0
15.5
17.0 18.0
19.0
20.0
2O.j
INSTANTANEOUS
OVERCURRENT
UNIT (DIRECTIONALLY
CONTROLLED)
Ranges and
ratings
of the
IOC
units,
relay
terminals
2
and
3
are
shown
in
Table
have
dual
ratings
obtained
by
series
or
parallel
connections.
5.
The
operating
coils
TABLE
3
CONTINUOUS
RATING
OF
VERY
INVERSE TIME
OVERCURRENT
UNIT
TABLE
4
5

GEK-
49850
DIRECTIONAL UNIT
The
directional
unit
operating
coil,
relay
terminals
5
and
6,
has
a five
a 200
ampere
one
second
rating. The
potential
polarizing
circuit,
terminals
circuit,
terminals
9
and
10,
are continuously
rated.
INSTANTANEOUS
UNIT (NON-DIRECTIONALLY
CONTROLLED)
The
instantaneous
unit
coil
is
tapped
for
operation
on
either
one
of
two
ranges
(H
or
L).
Selection
of
the
high
or
low
range
is
determined
by
the
position of
leads
T
and
E
at
terminal
15.
See
Table
6
and
the
applicable
interntal
connections
referenced
in Table
1.
For
the
H range,
connect
lead
T
to
terminal
15
and
lead
E
to
the
auxiliary
terminal
that
is
mounted
on
terminal
15.
For
range
L,
reverse
leads
T
and
E.
TABLE
6
CONTINUOUS
AND
ONE
SECOND RATINGS
OF
NON-DIRECTIONALLY
CONTROLLED
IOC
UNIT
One
**
Continuous
Second
Instantaneous
Range
Range
Rating Rating
Unit
(Amps)
(Amps)
(Amps) (Amps)
6
-
150
L
6
— 30
10.2
260
H
30
-
150
19.6
**The
range
is
approximate,
which
means
that
6-30,
30—150 may
be
6-28,
28-150. There will
always
be
at
least
one
ampere
overlap
between
the
maximum
L
setting and
the
minimum
H
setting.
When
ever
possible,
always
select
the
higher
range,
since
it
has
the
higher
continuous
rating.
TARGET
AND
SEAL-IN
UNIT
The
rating
and
impedance
of
the
seal-in
unit
for
the 0.2 and
2 ampere
taps
are
given
in
Table
7.
The
tap
setting used
will
depend
on
the
current
drawn
by
the
trip
coil.
The
0.2
ampere
tap
is
for
use
with
trip
coils
which
operate
on
currents
ranging
from
0.2
up
to
2.0
amperes,
at
the
minimum control
voltage.
If
this
tap
is
used
with
trip
coils requiring
more than
two
am
peres, there is
a
possibility
that
the
resistance
of
seven
ohms
will
reduce
the
current
to
so
low
a
value
that the
breaker
will
not
be
tripped.
The
two
ampere
tap
should
be
used
with
trip
coils
that
take
two
amperes
or
more
at
minimum
control
voltage,
provided
the
current
does
not
exceed
30
amperes
at
the
maximum
control
voltage.
If
the
tripping
current
exceeds
30
amperes,
the
connections
should
be
arranged
so
that
the
induction
unit
contacts
will
operate
an
auxiliary
relay
which
in
turn
energizes
the
trip
coil
or
coils.
On
such
an
application,
it
may
be
necessary
to
connect
a
loading
resistor
in
parallel
with
the
auxiliary
relay
coil
to allow
enough
current
to
operate
the
target
seal—in
unit.
TABLE
5
CONTINUOUS
AND
ONE
SECOND
RATINGS
OF
DIRECTIONALLY
CONTROLLED
IOC
UNIT
Total
Pickup
Continuous
One
Second
Range
Connections
Range
Rating Rating
(Amps)
Amps
(Amps)
(Amps)
2-16
Series
2-8
5.0
200
Parallel
4—16
6.5
260
10-80
Series
10-40
9.0
220
Parallel
20-80
15.0
260
ampere
continuous
rating and
7
and
8,
and
the
restraint
6

GEK-
49850
TABLE
7
SEAL-IN
UNIT
RATINGS
0.2
TAP
2.0
DC
RESISTANCE
÷
10%
(OHMS)
7
0.13
MIN.
OPERATING
(AMPERES)
+
0-25%
0.2 2.0
CARRY
CONT.
(AMPERES)
-
0.3 3.0
CARRY
30
AMPS
FOR
(SEC.)
-
0.03
4.0
CARRY
10
AMPS
FOR
(SEC.)
—
0.25
30.0
60
HZ
IMPEDANCE
(OHMS)
—
52.0 0.53
CON
TACT
S
The
current—closing
rating
of the
induction
unit
contacts is
30
amperes
for
voltages
not exceeding
250
volts.
Their current-carrying rating
is
limited
by
the
tap
rating
of
the
seal—in
unit.
OPERATING
CHARACTERISTICS
PICKUP
At
rated
voltage
and
maximum
torque
angle,
the
directional
unit
will
pick
up
at
9
+ 10
percent
amperes.
At
restraint
voltages
less
than
rated,
the
operating
current
is also less.
This
relationship
is
shown
by
the
curve
in
Fig.
10.
Pickup
of the
TOC
units
is
defined
as
the
current required
to
close
the
contacts from
the
0.5
time
dial
position.
The
pickup
value
is
within
five
percent
of
tap
value.
The
pickup
of the
directionally
controlled
IOC
unit
can
be adjusted
over
an
eight—to—one
range
as
indicated
in Table
5.
RESET
(TIME
OVERCURRENT
UNIT)
Inverse
time
overcurrent
units
reset
at
90
percent
of
the
minimum
pickup
current,
very
inverse
time
units
at
80
percent
and
extremely inverse
time
units
at
85
percent.
When
the
relay
is
de-energized,
the
time
required
for
the
disk
to
completely
reset
to
the
number
10
time
dial
position is
approximately
six
seconds
for
inverse
time
relays
and
60
seconds
for
very
inverse-
time
and
extremely
inverse-time
relays.
OPERATING TIME
The
time
curves
of
the
TOC
units
are
shown
in
Figs.
11,
12
and
13
respectively
for
inverse-time,
very
inverse-time
and
extremely
inverse-time
relays.
For
the
same
operating
conditions,
the
relay will
operate
repeatedly
within
one
or
two
percent
of
the
same
time.
The
time
curves
for
the
directionally
controlled
IOC
units
are
shown
in
Fig.
14.
The
time—current
characteristic
of
the
Hi—Seismic
non—directionally
controlled
TOC
unit
is
shown
by
Fig.
15
and
its
transient
overreach
characteristic
is
shown
by
Fig.
16.
BURDENS
Tables
8
and
9
give
the
directional
unit
burdens of the
potential
and
current
circuits
respectively.
Table
10
gives the
total
burden
of the
time
overcurrent
unit
plus
the
instantaneous
overcurrent
unit.
7

GEK-49850
TABLE
8
DIRECTIONAL UNIT
POTENTIAL
CIRCUIT
BURDENS
AT
60
CYCLES
AND
RATED
VOLTS
VOLT
POWER
WATTS
CIRCUIT
AMPERES
FACTOR
Polarizing
15.2
0.93
14.1
Restraint
5.9
0.66
3.9
IMPED.
VOLT-
POWER
(OHMS)
AMPERES
FACTOR
0.12
I
3.00
I
0.52
RANGE
BURDENS
AT
MIN.
PICKUP
BURDEN
OHMS
(Z)
TIME
———
MIN.
TAP
OF
TOC
UNIT
CHARACTER-
TOC
IOC
IOC
UNIT
3
TIMES
10
TIMES
AT 5
ISTIC
UNIT
UNIT
CONNECTIONS
R
**
+VA
P.F.
MIN.
P.U.
MIN.
P.U.
AMPS
2-16
Series
2-8
0.61
2.01
2.10
8.4
0.29 1.21 0.85
53
Parallel
4-16
0.42
1.54
1.60
6.4
0.26 0.76 0.43
40
Inverse
2-16
10-80
Series 10-40
0.45
1.58
1.65
6.6
0.27 0.81
0.48
41
Parallel
20-80 0.38
1.45
1.50
6.0
0.25
0.67
0.34
38
2—16
Series
2—8
0.47
1.10
1.20
2.7
0.39
1.20 0.53
30
Very
Parallel
4-16
0.28
0.63
0.69 1.6
0.41
0.69
0.47
17
Inverse
1.5-12
10-80
Series
10-40
0.31
0.67
0.74
1.7
0.42
0.74
0.52 19
Parallel
20-80
0.24 0.54 0.59
1.3
0.41
0.59
0.38
15
2-16
Series
2-8
0.33 0.72
0.79
1.8
0.42 0.79
0.70
20
Extremely
Parallel
4-16
0.13 0.25
0.28
0.5
0.46
0.28
0.28
7
Inverse
1.5-12
10-80
Series
10-40
0.16
0.29
0.33
0.7
0.49 0.33 0.33
8
Parallel
20-80
0.10 0.16
0.19
0.4
0.53
0.19
0.19
5
**The
impedance values
given
are
those
for
the
nhiriinium
tap
of
each
relay.
The
impedance
for
other taps,
at
pickup
current
(tap
rating),
varies inversely
approximately
as
the
square
of
the
current
rating.
Example:
for
the
very
inverse
relays, 1.5/12
amperes, with
impedance
of
the
1.5
ampere
tap
of
1.20
ohms,
the
impedance
of
the
three
ampere
tap,
at
three
amperes,
is
approximately
(1.5/3)2
X 12O
= 0.3
ohms.
+Sorne
companies
list
relay
burdens only
as
the volt-ampere
input
to
operate
at
minimum
pickup. This
column
is
included
so
a
direct
comparison
can
be
made.
It
should
not
be
used in
calculating
volt—ampere
burdens
in a
CT
secondary
circuit, since
the
burden at five
amperes
is
used
for
this
purpose.
*Calculated
from
burden
at
minimum pickup.
TABLE
9
DIRECTIONAL
UNIT
CURRENT
CIRCUIT
BURDENS AT
60
CYCLES
AND 5
AMPS
TABLE
10
BURDENS
OF
OVERCURRENT
UNITS
(TIME
AND
INSTANTANEOUS)
AT
60
CYCLES
8

GE K-4
9850
TABLE
11
BURDEN OF
NON-DIRECTIONALLY
CONTROLLED
INSTANTANEOUS
UNIT
Inst
Unit
Ran
e
Mm.
Burdens
at
Mm.
Burdens
Ohms
(Z)
HZ
Range
Pickup
Pickup (Ohms)
Tinies
Pickup
p
,
p
(Amps)
R
Z
3
10 20
L
6-30 6
0.110 0.078 0.135 0.095
0.081 0.079
6-150
60
H
30-150 30
0.022
0.005
0.023 0.022
0.022 0.022
CONSTRUCTION
Type
JBCV
relays
are
single
phase, directional
overcurrent
relays
with
voltage
restraint.
They
are
available
with
inverse,
very
inverse
or
extremely
inverse
time-current
characteristics.
The
JBCV
relays
consist
of
three
main
units, an
instantaneous
overcurrent
unit
(top)
of the induction-cup
type,
a
time
overcurrent
unit
(middle)
of
the
induction—disk
type,
and
an
instantaneous
power—directional
unit
(bottom)
of
the
induction-cup
type.
The
directional
unit
is potential
polarized
and,
by
means of
its
closing
con
tacts,
directionally
controls
the
operation
of
both
the
time
overcurrent
and
instantaneous
overcurrent
units.
All
units
are
mounted
in
the
L2,
(large
double—ended)
drawout
case.
The
IOC
(instantaneous
over—
current) unit
and
the
TOC
(time
overcurrent)
unit
each
have
an
associated
target
and
seal-in unit.
The
JBCV53M(-)Y1A,
as
shown
by
Table
1,
has
an
additional
IOC
unit
which
is
of
the
hinged
armature
type.
DIRECTIONAL UNIT
The
directional
unit
is
of
the
induction-cylinder
construction
with a
laminated
stator
having
eight
poles
projecting
inward
and
arranged symmetrically
around
a
stationary
control
core.
The
cup-like
aluminum
induction
rotor
is
free
to
operate
in
the
annular air
gap
between
the
poles
and
the
core.
The
poles
are
fitted
with
voltage
restraint,
current operating,
and
potential
polarizing
coils.
The
principle
by
which
torque
is
developed
is
the
same as
that
of
an
induction
disk
relay
with
a
wattinetric
element,
although,
in
arrangement
of
parts,
the
unit
is
more
like
a
split—phase
induction
motor.
The
induction—cylinder
construction
provides higher
torque
and
lower
rotor
inertia than
the
induction—disk
construction,
resulting
in a
faster
and
more
sensitive
relay.
Low
Gradient
Contact
The
directional
unit
contacts
(left
front),
which
control
the
time
overcurrent
unit
are
shown
in
Fig.
17. They
are
of
the
low
gradient
type
specially
constructed
to
minimize
the
effects
of
vibration.
Both
the
stationary
and
moving
contact
brushes
are
made
of
low
gradient
material
which,
when
subjected
to
vibration,
tend to
follow one
another,
hence,
they
resist
contact
separation.
The
contact
dial
(A)
supports the
stationary
contact
brush
(B)
on
which
is mounted
a conical
contact tip
(C).
The
moving
contact
arm
(D)
supports
the
moving contact
brush
(E)
on
which is
mounted a
button
contact
tip
(F).
The
end
of
the
moving
contact
brush bears
against
the
inner
face
of
the
moving
contact
brush
retainer
(B).
Similarly,
the
end
of
the
stationary
contact brush
bears
against
the
inner
face
of
the
stationary
contact
brush retainer
(H). The
stationary
contact
support (K)
and
the
contact dial
are
assembled
together
by
means
of
a
mounting
screw
(L)
and
two
locknuts
(N).
Barrel Contact
The
directional
unit
contacts
(right
rear),
which
control
the
instantaneous
overcurrent
unit,
are
shown
in
Fig.
18.
They
are
specially
constructed
to
suppress
bouncing.
The
stationary
con
tact
(B)
is
mounted
on
a flat
spiral
spring
(F) backed
up by
a
thin
diaphragm
(C).
These
are
both
mounted in
a
slightly
inclined
tube
(A). A
stainless
steel
ball
(B)
is
placed
in
the
tube
before
the
diaphragm
is
assembled.
When
the
moving
contact hits
the
stationary
contact, the
energy
of
the
former
is
imparted
to
the
latter
and
thence
to
the
ball,
which
is
free
to
roll
up
the
inclined
tube.
Thus,
the
moving
contact
comes to
rest
with
substantially
no
rebound or
vibration.
To
change
the
stationary
contact
mounting
spring, remove
the
contact barrel
and
sleeve
as
a
complete
unit
after
loosening
the
screw
at
the
front
of
the
contact
block. Unscrew the
cap
(E).
The
contact
and
its
flat
spiral
mounting
spring
may
then
be
removed.
9

GE
K-49850
TIME
OVERCURRENT
UNIT
The
inverse
time
and
very
inverse
time
overcurrent
units consist
of
a
tapped
current
operating
coil
wound on
a
U—magnet
iron
structure.
The
tapped
operating
coil
is
connected to
taps
on
the
tap
block.
The
U-magnet
contains
wound
shading
coils
which
are
connected
in
series
with
a directional
unit contact.
When
power
flow
is
in
such
a
direction
as
to
close
the
directional
unit contacts,
the
shading
coils
act
to
produce
a
split-phase
field
which, in
turn,
develops
torque
on
the
operating
disk.
The
extremely
inverse
time
overcurrent
unit
is
of the
wattmetric
type
similar
to
that
used
in
watthour
meters except
as
follows:
the
upper
portion
of
the iron
structure
has
two
concentric
windings
on
the
mid
dle
leg
of
the
magnetic
circuit.
One
of
these is
a tapped
current
winding
connected
to
taps
on
the
tap
block;
the
other
is
a
floating
winding
which
is
connected
in
series
with
the
directional
unit
contacts,
a
resistor,
a
capacitor
and
the
two
coils
on
the
lower
legs
of
the
magnetic
circuit.
When
power
is
in
such
a
direction
as
to
close
a directional
unit
contact,
the
unit
develops
torque
on
the
operating
disk.
The
disk shaft
carries
the
moving
contact
which
completes
the
trip
circuit
when
it
touches the
sta
tionary contact
or
contacts.
The
shaft
is
restrained
by
a
spiral spring
to
give
the proper
contact-closing
current, and
its
motion
is
retarded
by
a
permanent
magnet
acting
on
the
disk
to
produce
the
desired
time
characteristic.
The
variable
retarding
force
resulting
from
the
gradient
of the
spiral spring is
compen
sated
by
the
spiral
shape
of
the
induction
disk,
which
results
in
an
increased
driving
force
as
the
spring
winds
up.
The
torque
control
circuits
of
both
the
time
overcurrent
and
instantaneous
overcurrent units
are
wired
to
terminals
on
the
relay
contact
block.
These
terminals
are shorted
together
by
internally
connected
red
jumper
leads
when
the
relays
leave
the
factory
(see
Figs.
5 to
7
inclusive).
If
external
torque
con
trol
is
desired, these
jumper
leads
should
be
removed.
TARGET
AND
SEAL-IN
UNITS
The
seal-in
units
for
both
the
TOG
and
lOG
contacts
of
the
JBCV51M, JBCV53M
and
JBCV77M
relays
are
mounted
on
the
lOG
middle
unit.
On
the
JBCV53M(-)Y1A
relay
the
right
hand
seal—in
unit
is
replaced
by
the
non—directionally
controlled
lOG
unit
and
the
seal—in
unit
is
moved
to
the
left
side
of
the
directional
(lower) unit.
The
left
seal-in
unit
operates
in
conjunction
with
the
time
overcurrent
unit
contacts
and
is
labeled
TIME”. Its
coil
is
in
series and
its
contacts
in
parallel
with
the
main
contacts of
the
time
overcurrent
unit
so
that
when
the
main
contacts close,
the
seal—in
unit
will
pick
up
and
seal
in
around
the
main
con
tact.
The
right seal-in
unit,
labeled
“INST.
operates
in
conjunction
with
the
instantaneous
overcurrent
unit.
Its
coil
is
in
series
with
the
instantaneous
unit
contact and
a
contact of
the
directional
unit,
and
its
contact
is
connected
to
seal
in
around
these
two
contacts
when
the
unit
operates.
Both
seal—in units
are
equipped
with
targets
which are
raised
into
view
when
the
unit operates.
These
targets
latch
and
remain exposed
until
manually
released
by
means
of
the button
projecting
below the
lower—
left
corner
of
the
cover.
INSTANTANEOUS
OVERCURRENT
UNIT
(DIRECTIONALLY
CONTROLLED)
The
instantaneous
overcurrent
unit
is
similar
in
construction
to
the
directional
unit
described
above,
differing
only
in
coil turns
and
connections.
The
four corner
coils
consist of
two
windings,
an
inner
winding
consisting
of
a
large number
of
turns
of
fine
wire, and
an
outer
winding
having
a
few
turns
of
heavy
wire.
The
outer
windings
of
the
corner
coils
are
connected
either
in
series or
in
parallel with
the
side
coils
by
tap
links
provided
on
the
relay; these
series or
parallel
combinations
are
connected
in
series
with
the
operating
coil
of
the
TOG
unit.
The
inner
windings
of
the corner
coils
are
all
connected
in
series,
and
in
turn
are
connected
in
series
with
a
capacitor
and
a
contact
of
the
directional
unit.
This
circuit
thus
controls
the
torque
of the
instantaneous
overcurrent
unit.
When
the
directional
unit
contacts are
open,
the
instantaneous
overcurrent
unit
will
develop
no
torque.
When
the
directional
unit
contacts
are
closed,
the
instantaneous
overcurrent
unit
will
develop
torque in
proportion
to
the
square
of
the
current.
The
instantaneous
overcurrent
unit
develops
operating
torque
in
a
direction
opposite
to
that of
the
directional
unit. This
makes
the
relay
less
susceptible
to
the
effects
of
shock.
10

GEK-49850
INSTANTANEOUS
UNIT
(NON-DIRECTIONALLY
CONTROLLED)
This
IOC
unit
is
a small
hinged
armature
type
instantaneous
element
and is
mounted
on the
right
side
of
the
TOC unit.
The IOC
element
operates
over
a
25—to-one total
range
obtained
by
using
a
tapped
coil
which
has a
five-to-one
low
range
and
a five-to—one
high
range;
this combination
provides the
25—to—one
total
range.
When the
current
reaches a predetermined
value, the
instantaneous
element
operates closing
its contact
circuit and
raising
its
target into
view.
The target
latches in
the
exposed position until
it
is
released.
The same
button
that
releases the
target seal—in
unit
also releases
the target
of
the
instantaneous
unit.
RECEIVING,
HANDLING
AND STORAGE
These relays,
when not included
as
part of
a
control
panel will
be
shipped
in cartons
designed
to
pro
tect them
against
damage.
Imimediately
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
conipany
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 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
ensure
that
no damage
has been
sustained
in
shipment and
that
the
relay
calibrations
have not
been
disturbed.
If the
examination
or
test
indicates
that
readjustment is
necessary,
refer
to
the
section on
SERVICING.
These
tests
may be
performed
as part of
the
installation
or acceptance
tests
at the
discretion
of
the
user.
Since
most
operating companies use
different
procedures
for acceptance
and
installation
tests,
the
following
section
includes
all applicable
tests
that
may be
performed
on these
relays.
VISUAL
INSPECTION
Check the
nameplate
stamping
to ensure
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.
Check that
the
shorting
bars are in
the proper
location(s)
as
shown
by the internal
connections
diagram, Figs.
5 to 7
inclusive
and that the
main
brush
is
properly
formed to
contact the
shorting
bar.
MECHANICAL
INSPECTION
Tpnij9ç
1.
The rotating
shaft
end
play
should be
0.015—0.020
inch.
2. The
contact gap
should
be 0.028-0.036
inch.
3.
There
should
be
no
noticeable
friction
in the
rotating
structure.
4.
With the
relay well
leveled
and in its
upright position,
the
contact should
be open and
resting
against
the
backstop.
Middle
Unit
(TOC)
1.
The disk
shaft
end
play should
be 0.005-0.015
inch.
2. The
disk
should
be
centered in
the
air
gaps
of
both
the electromagnet
and
drag magnet.
3.
Both air
gaps
should be free
of foreign
matter.
11

GEK-49850
4. The
disk
should rotate
freely
and should
return
by itself
to the
reset position.
5.
The moving
contact
should
just touch
the
stationary
contact
when the
time
dial is at
the
zero
tinie dial
position.
Bottoiri
Unit
(DIR)
1. The
rotating
shaft
end play
should
be
0.015—0.020
inch.
2. The contact
gap
should
be
0.015—0.025
inch on the
low
gradient
front contact.
3.
The
front
contact
should
close
approximately
0.005
to 0.010
inch
before
the
rear contacts.
Target
and
Seal—in
Units/Instantaneous
Unit
1.
The
armature
and contacts
should
move
freely when
operated
by hand.
2.
Both
contacts
should
make
at
approximately
the
same time.
3. The
target
should latch
into view
just
as the
contacts
make and
should
unlatch
when the
target
release
button
is
operated.
4. The
contacts
should
have approximately
0.030 inch
wipe.
DRAWOUT
RELAYS GENERAL
Since
all drawout
relays
in service
operate
in
their
cases,
it
is
recommended
that
they be
tested
in
their
case
or an equivalent
steel case.
In this way,
any magnetic
effects
of
the
enclosure will
be
ac
curately
duplicated
during
testing.
A
relay may be
tested without
removing
it from
the
panel by
using
two
12XLA13A test
plugs.
This plug
makes connections
only
with
the
relay
and
does not
disturb
any shorting
bars
in the
case.
The 12XLA12A
test plug may
also be
used.
Although
this
test plug
allows
greater
testing
flexibility,
it
requires
C T
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)
is
affected by
non—sinusoidal
wave
forms.
TARGET
AND SEAL-IN
UNITS
The
target
and
seal-in unit
has an
operating
coil
tapped
at
0.2
and 2.0
amperes.
When
used with
trip
coils
operating on
currents
ranging from
0.2
to
2.0
amperes at
the
minimum
control
voltage,
the
target
and
seal-in tap
screw should
be
set
in the 0.2
ampere tap.
When
the trip coil
current
ranges
from
two to
30
amperes
at the
mininlurn
control
voltage, the tap
screw
should
be
placed
in the
2.0
ampere
tap.
The
seal-in
tap screw
is the screw
holding
the right—hand
stationary
contact
of the
seal—in
unit.
To
change
the tap
setting,
first
remove the
connecting plug.
Then
take
a
screw
from
the left—hand
sta
tionary contact
and place
it in the desired
tap.
Next,
remove
the screw
from
the
other
tap and place
it
back in the
left—hand
contact.
This procedure
is
necessary
to
prevent
the
right—hand
stationary
contact
from
getting
out
of adjustment.
Tap
screws
should
never
be left
in both taps
at the same
time.
Pickup
and Dropout
Test
1.
Connect relay
studs
1
and
11
or
1
and
12
(see
internal
connections
diagram)
to a DC
source,
amnnieter
and load
box
so that the
current
can be
controlled
over
a range of
0.1 to
2.0 amperes.
2.
Close or jumper
the contact(s)
that
parallel
the
seal—in
unit contact.
3.
Increase the
current
slowly
until
the
seal-in unit
picks
up. See
Table
12.
4.
Open
the
parallel
contact circuit
of
step
2; the
seal-in
unit should
remain in
the picked
up
position.
5.
Decrease
the current
slowly until
the
seal-in
unit drops
out.
See Table
12.
12

GEK-49850
TABLE
12
TARGET
AND
SEAL-IN
UNIT
OPERATING
CURRENTS
TP
PICKUP
DROPOUT
CURRENT CURRENT
0.2
0.115-0.
195
0.05
OR
MORE
2.0
1.15
-1.95
0.50
OR MORE
TIME
OVERCURRENT
UNIT
Rotate
the
time
dial
slowly and
check
by
means
of
a lamp
that
the
contacts
just
close
at
the
zero
time
dial
setting.
Where
the
contacts
just
close
can
be
adjusted
by
running
the
stationary
contact
brush
in
or
out
by
means
of
its
adjusting
screw.
This screw
should
be
held
securely
in
its
support.
With
the
contacts
just
closing
at
No.
0
time
setting,
there
should
be
sufficient
gap
between
the
stationary
contact brush
and
its
metal
backing
strip
to
ensure
approxilTiately
1/32
inch
wipe.
Cirrent Setting
The minimum
current
at
which
the
time
overcurrent
unit
will close
its
contacts is
determined
by
the
position
of
the
plug
in
the tap block.
The
tap
plate
on
this block
is
marked
in
amperes,
as
shown
in
Tables
2,
3
and
4.
When
the
tap
setting
is
changed
with
the
relay
in
service,
the
following
procedure
must
be
followed:
(i)
remove
the
connecting plug;
this
de-energizes
the
relay
and
shorts
the
current
transformer
secondary
winding.
(2)
remove
the
tap
screw
and
place
it
in
the
tap
marked
for
the
desired
pickup
current.
(3)
Replace the
connecting plug.
The minimum
current
required
to
rotate the
disk
slowly and
to
close
the
contacts
should
be
within
five
percent
of the value
marked
on
the tap
plate
for
any
tap
setting and
time
dial
position.
If
this
adjustment
has
been
disturbed,
it
can
be
restored
by
means
of
the
spring
adjusting
ring.
The
ring
can
be
turned
by
inserting
a
screw
driver
blade
in
the
notches
around
the
edge.
By
turning
the
ring,
the
opera
ting
current
of
the
unit
can
be
brought
into
agreement
with
the
tap
setting
employed.
This
adjustment
also
permits
any
desired
setting
to
be
obtained
intermediately
between
the
available
tap
settings.
Pickup
adjustment
by
means of
the
control spring
applies
to
the
JBCV51
and
JBCV53
relays.
A
different
procedure
applies
to
the
JBCV77 relay.
For
the
JBCV77
relay,
the
pickup of
the
unit for
any
current
tap
setting is
adjusted
by
means
of
the
variable
resistor
in
the
phase—shifting
circuit.
This
adjustment
also
permits
any
desired
setting
intermediately
between
the
various
tap
settings to
be
obtained.
The
control
spring
is
prewound approximately
660
degrees
with
the
contacts
just
closed. Further
adjustment of
this
setting
is
seldom
required;
if
it
is
required,
because
of
insufficient
range of the
variable
resistor,
it
should
never
be
necessary
to
wind
up
the
control
spring
adjuster
more
than
30
degrees
(one
notch)
or
unwind
it
more
than
90
degrees
(three notches)
from
the
factory
setting.
Test
connections
for
making
pickup
and
time
checks
on
the
time
overcurrent
unit
are
shown
in
Fig.
20.
Use
a
source
of
120
volts
or
greater
with
good
wave
form
and
constant
frequency.
Stepdown transformers
or
phantom
loads
should not
be
employed
in
testing
induction
relays
since
their
use
may
cause
a
distorted
wave
form. The
contact
in
the
wound
shading coil
circuit
marked
0,
see
internal
connections
diagram,
must
be
blocked
closed
or
jumpered
for
both
the
pickup test
and
the
time
test.
Time
Setting
The
setting of
the
time
dial
determines
the
length of
time
the
unit
requires
to
close
its
contacts
when
the
current
reaches a
predetermined
value.
The
contacts are
just
closed
when
the
dial is
set
on
zero.
When
the
dial
is
set
on
10,
the
disk
must
travel
the
maximum
amount
to
close
the
contacts
and
therefore
this setting
gives
the
maximum
time
setting.
The
primary
adjustment
for
the
time
of
operation
of
the
unit
is
made
by
means
of
the
time
dial.
However,
further
adjustment
is
obtained
by
moving
the
permanent
magnet
along
its
supporting
shelf;
moving
the
magnet
toward
the
disk
shaft
decreases the
time,
while
moving
it
away
increases
the
time.
Be
sure
the
magnet never
extends
out
beyond
the
cutout
in
the
disk.
13

GEK-49850
Pickup
Test
Use rated
frequency
for both
the
pickup
and
time
tests.
Set the
relay
at
the 0.5
time
dial
position
and
2.0
ampere
tap.
Using
the
test
connections
in
Fig.
20
the main
unit
should
close
its
contacts
within
‘-2.0
percent
of tap value
current
(1.96-2.04
amps).
Time
Test
Set the
relay
at
No.
5 time
dial
setting
and
the
2.0
amp
tap.
Using
the
test connections
of
Fig.
20,
apply
five
times
tap current
(10.0
amp)
to the
relay.
The
relay
should
operate
within
the
limits
shown
in Table
13.
TABLE
13
TOC
UNIT
OPERATING
TIME
LiMITS
Time
in
Seconds
Relay
Type Mm.
Midpoint
Max.
JBCV51
1.72
1.78
1.83
JBCV53
1.27
1.31
1.35
JBCV77
0.89
0.92
0.95
DIRECTIONAL
UNIT
Polarity
Check
The polarity
of
the
external
connections
to
the operating
and
polarizing
circuits of
the directional
unit
may
be
verified
by
disconnecting
the
external
connections
to
the
restraint
circuit and
observing
the
direction
of
contact
armature
torque
when
the
line
is
carrying
load
at
unity
power
factor,
or
slightly
lagging
power
factor.
Note
that
in
most
directional
overcurrent
relay
applications,
the desired
directions
are:
contact
closing
for
power
flow
away
from
the bus,
and
contact
opening
for
power
flow
toward
the
bus.
In
case
of
doubt,
refer
to
Fig.
21 for
a
more
accurate
method
of
checking
the
polarity
of
the
external
connections
to the
operating and polarizing
circuits.
Note
that,
during
this
test,
the
restraint
circuit
is
automatically disconnected
by
means
of
the
test
plug.
The
polarity
of the
restraint
circuit
is automatically
checked
when
it
is reconnected,
or
when
the
test
plug
is
removed and
the connection plug
is
reinserted.
With
normal
load
and
rated
voltage, the
restraint
circuit
should
always
cause
the directional
unit
contacts
to open
regardless of
the direction of
power
flow.
Fig.
22
shows
the
test
connections for
checking
the
polarity
of
the
directional
unit
itself.
INSTANTANEOUS OVERCURRENT
UNIT (DIRECTIONALLY
CONTROLLED)
Pickup
Setting
The
pickup
of the
instantaneous
overcurrent
unit
can
be
adjusted
over
an
eight—to-one
range,
as indi
cated
in Table
5,
by
varying the
tension
of
the
spiral
control
spring
and
by selection of
the
appropriate
series
or parallel connections.
The
outside
end
of this
spring
is fastened
to
a
post
on
the adjusting
ring
above
the
moving
contact,
and
the
ring
is in
turn
clamped
in position
by
a
hexagonal-head
locking
screw.
If
this
screw
is
loosened,
the ring
can
be slipped
to vary
the
spring
tension.
Make
test
connections as shown
for
the
applicable
relay
type
by
Fig.
23.
In adjusting pickup,
the
desired
pickup
current
should
be
passed
through
the
coils
and the
control spring should
be adjusted
until
the
contact
just
closes.
The
adjusting
ring
should
then
be
locked
in
position
and
the
pickup
current
re
checked.
Note
that
the
directional—unit contacts must
be held
closed
during
this
adjustment.
14

GEK—49850
INSTANTANEOUS UNIT (NON-DIRECTIONALLY
CONTROLLED)
Make sure that the instantaneous unit
is in the correct range in which it is to operate. See the
internal connections diagram and Table 6. Whenever
possible, use
the
higher range since the higher range
has a
higher continuous rating.
The instantaneous unit has an
adjustable
core located at the top of the unit. To
set the instantaneous
unit to a desired pickup, loosen
the
locknut
and
adjust the core. Turning
the core clockwise decreases
the pickup,
turning the core counterclockwise
increases the pickup.
Bring
up the current
slowly until the
unit picks up. It may be necessary
to
repeat
this operation,
until the desired pickup value
is obtained.
Once the desired pickup value is reached, tighten the locknut.
CAUTION
- Refer to Table
6
for the continuous
and one second ratings
of
the instantaneous
unit. Do not
exceed these ratings when applying current
to
the instantaneous
unit.
The
range
of
the
instantaneous
unit (See Table 6) must be obtained
between
a core
position of 1/8 of
a turn of full
clockwise
and
20
turns counterclockwise from the full
clockwise position.
INSTALLATION
LOCATION
The location should be clean and dry, free from dust and excessive vibration and well lighted to
facilitate inspection and testing.
MOUNTING
The
relay should
be
mounted on a vertical surface.
The
outline and panel drilling diagram
is shown
in
Fig. 24.
CONNECTIONS
The internal
connection diagrams for the various relays are shown
in
Figs. 5
to
7. Typical
wiring
diagrams are
shown by Figs. 8 and
9.
Since phase sequence is important for the correct
operation
of
Type
JBCV relays,
the
rotation
specified in Figs.
8
and
9
must
be adhered to. Unless
mounted
on
a
steel panel
which
adequately grounds the
relay
case,
it
is recomended that the case be grounded through
a
mounting
stud or screw with a
conductor not less than
#12
B&S gage copper wire or its
equivalent.
Terminal 12 of JBCV relays
should be connected to the negative side of the DC
bus.
INSPECTION
At
the time of installation, the
relay should be inspected for tarnished contacts, loose screws, or
other imperfections. If any
trouble is found, it should
be
corrected
in
the manner described in the
section on SERVICING.
CAUT ION
Every circuit in the drawout case has an
auxiliary
brush. It
is
especially important
on current cir
cuits and other circuits with shorting bars that the auxiliary brush be bent high enough to
engage the
connecting plug or test
plug before the main brushes do. This will
prevent CT secondary circuits from
being opened. Refer
to
Fig.
19.
OPERATION
Before the relay
is put into service, it
should
be given a check to determine
that factory adjustments
have
not
been
disturbed. The time dial will be set at zero before the relay leaves the
factory.
If
the
setting has not been
changed, it will be necessary to
change
this
setting
in
order
to open the time over
current unit
contacts. The following tests are suggested:
TARGET AND SEAL-IN UNITS
1.
Make sure that the tap
screw
is
in the desired tap.
2. Perform pickup and
dropout
tests as
outlined
in
the ACCEPTANCE TESTS
section.
15

GE K-4 9850
TIME
OVERCURRENT
UNIT
1.
Set the tap
screw
on
the desired
tap.
Using
the
test
circuit
in Fig.
20,
apply approximately
twice
tap value
current
until the
contacts
.iust
close.
Reduce
the current until the
light
in
series
with the
contacts
begins
to flicker.
This value of
current
should
be within
five
percent
of
tap value.
2.
Check
the
operating
time
at
some
multiple
of
tap value.
This
multiple
of
tap value
may
be five
times
tap
rating
or
the
maximum
fault
current
for
which
the
relay must
coordinate.
The
value
used
is
left
to the
discretion
of the
user.
DIRECTIONAL
UNIT
Check
directional
unit
polarity;
see ACCEPTANCE
TESTS.
INSTANTANEOUS
OVERCURRENT
UNIT
(DIRECTIONALLY
CONTROLLED)
Check
pickup
setting;
see
ACCEPTANCE
TESTS.
INSTANTANEOUS
UNIT
(NON-DIRECTIONALLY
CONTROLLED)
1.
Select
the
desired
range
by
making
the
proper
connections
at
the rear
of the
relay
(see
internal
connections
diagram).
Whenever
possible,
always
select
the
higher
range since
it
has
a higher
continuous
rating.
2.
Set the
instantaneous
unit
to
pick up
at the
desired
current
level.
See
the ACCEPTANCE
TESTS
section.
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
user’s
experience
with
periodic
testing.
Until the
user
has
accumulated
enough
experience
to
select
the
test
interval
best
suited
to
his
individual
requirements,
it
is
suggested
that
the
points
listed
below be
checked
at an
interval
of
from
one
to two
years.
These tests
are
intended
to
ensure
that
the
relays
have
not deviated
from
their
original
setting.
II
deviations
are encountered,
the
relay
must be
retested
and serviced
as
described
in this
manual.
TARGET
AND SEAL-IN
UNITS
1.
Check
that the
unit picks
up
at the
values
shown in
Table
12.
2.
Check
that
the
unit
drops
out at
25 percent
or
more
of
tap value.
TIME OVERCURRENT UNIT
1.
Perform
pickup
test
as
described
in the
INSTALLATION
section
for
the tap
in
service.
2.
Perform
the
time tests
as
described
in the
INSTALLATION
section.
DIRECTIONAL
UNIT
Check condition
and
operation
of contacts.
A polarity
check
should
not
be
necessary
if
it was
cor
rectly
installed
and
no
subsequent
wiring
changes
were
made.
INSTANTANEOUS
OVERCURRENT
UNIT (DIRECTIONALLY
CONTROLLED)
Check
that
the
instantaneous
unit
picks
up
at the
desired
current
level
as
outlined
in
the
ACCEPTANCE
TEST
section.
INSTANTANEOUS
UNIT (NON-DIRECTIONALLY
CONTROLLED)
Check that
the
instantaneous
unit
picks
up at
the
desired
current
level,
as outlined
in
the ACCEPTANCE
TESTS
and the
INSTALLATION
TEST
sections.
16

GEK—49850
SERVICING
These
relays
are
adjusted
at
the
factory
and
it
is
advisable
not
to
disturb
the
adjustments.
If,
for
any
reason,
they
have
been
disturbed
or
it
is
found
during
installation
or
periodic
testing
that
the
relay
is
out of
limits,
the
checks
and
adjustments
outlined
in
the
following
paragraphs
should
be
observed.
It
is
suggested
that
this
work
be
done
in
the
laboratory.
TARGET
AND
SEAL-IN
UNITS
Repeat
the
visual
and
mechanical
inspections
and
the
pickup
and
dropout
current
checks
as
outlined
in
the
ACCEPTANCE
TESTS
section.
TIME
OVERCURRENT
UNIT
Disk
and
Oearin9s
The
jewel
should
be
turned
up until
the
disk is centered
in
the
air
gaps,
after
which
it
should
be
locked
in
this
position
by
the
set
screw
provided
for
this
purpose.
The
upper
bearing
pin should
next
be
adjusted
so
that
the
disk
shaft
has
about
1/64
inch
end
play.
Contact
Adjustment
The
contacts
should
have about
1/32
inch wipe. That
is,
the
stationary
contact
tip
should
be
deflected
about
1/32
inch
when
the
disk
completes
its
travel.
Wipe
is
adjusted
by
turning
the
wipe
adjustment
screw
thereby
adjusting
the
position
of
the
brush
relative
to
the
brush
stop.
When
the
time
dial is
moved
to
the
position
where
it
holds
the contacts
just
closed,
it should
indi
cate
zero
on
the
time—dial
scale.
If
it
does
not
and
the
brushes
are
correctly
adjusted,
shift
the
dial
by
changing
the position
of
the arm
attached
to
the
shaft
just
below
the
time dial.
Loosen
the
screw
clamping
the arm
to
the
shaft
and
turn
the
arm
relative
to
the
shaft
until
the
contacts
just
make
for
zero
time—dial
setting.
Characteristics
Check
and
Adjustment
Repeat
the
portions
of the
ACCEPTANCE
TESTS
section
that
apply
to
the
time
overcurrent
unit.
Also,
check
reset
voltage
and
time
as
outlined
under
RESET
in
the
CHARACTERISTICS
section;
low
reset
voltages
or
long
reset
times
may
indicate
excessive
friction
caused
by
a
worn
bearing
or
by
mechanical
interference.
On
JBCV77
relays,
set
the relay
on
the
two—amp
tap
with
the
time
dial
set
so
that
the
contacts
are
just
open.
Adjust
pickup
within
the
limits
1.96 to
2.04
amp
but as
close
as
possible
to
2.0
amps.
Then
move
the
time
dial
to the
No.
10
position
and
check
the
current
required
to
just
move
the disk
away
from
the
stop
arm.
This
current
should
be
within
the
limits
1.88
to
2.12
amp.
If
the
disk
moves
at
the
lower
limit,
check
that
movement
is
not
over
1/2
inch
measured
along
the
periphery
of
the disk.
This
is
called
a
compensation check.
If
the
current
falls
outside
the 1.88
to
2.12
amp
limits,
the
following
steps
should
be taken:
reset
the
control spring
until
compensation
at
No.
10
time
dial
is
within
limits.
Then
restore
pickup
by
adjusting
the
resistor.
Recheck
compensation
after
the
resistor
adjustment.
DIRECTIONAL
UNIT
Bearings
The
lower
jewel
bearing
should
be
screwed
all
the way
in
until
its head
engages
the
end
of
the
threaded
core
support.
The
upper
bearing
should
be
adjusted
to
allow
about
1/64
inch
end
play
in
the
shaft.
To
check
the
clearance
between
the
iron
core
and
the
inside
of
the rotor
cup,
press
down
on
the contact
arm
near
the
shaft
thus
depressing
the
spring—mounted
jewel
until
the
cup
strikes
the
iron.
The
shaft
should
move
about
1/16
inch.
Cup
and
Stator
Should
it
be
necessary
to
remove
the
cup—type
rotor
from
the
directional
unit,
the following
procedure
should
be
followed:
All
leads
to
the unit
should
first
be
disconnected
and
tagged
for
identification
in
reconnecting.
The
unit
can
then
be
removed
from
the
cradle
with its
mounting
plate
still
attached.
17

GE K-
49850
The
upper
of
the three
flat-head
screws
holding
the
unit
to
the
plate
should
now
be
removed.
On
some
models,
it
hay be
necessary
to
reniove
a
resistor
or
capacitor
to expose
this
screw.
The
four
corner
screws clamping
the
unit
together,
should
next
be
removed,
and
the
entire
top structure
lifted
off.
This
gives
access to
the
cup
assembly
and
exposes
the
stator
assembly,
which
should
be
protected
to
keep
it
free from
dust
and
metallic
particles
until
the unit
is reassembled.
To
remove
the
shaft
and
rotor
from
the contact
head
assembly,
the
spring
clip at
the
top of
the
shaft
must be
pulled
out
and
the
clutch
adjusting
screw
taken
out
of
the
side
of
the
molded
contact
arm.
The
shaft
and
cup
can
now
be
pulled
out
of
the
molding.
The
rotor
must
be
handled
very
carefully
while
it
is
out
of
the
unit.
Contact
Adjustments
To facilitate
adjustment
of
contacts,
remove
the
two
red
jumper
leads
from
terminals
18,
19
and
20
and
use
a neon
indicating
lamp
in
series
with
an AC
voltage
supply
across
terminals
18
and
19
and
19
and
20
to
signify
all
contact
closures.
Refer
to Fig.
18
and Fig.
17
for
identification
of
barrel
and
low gradient
contact
parts
respectively
and
proceed
as follows:
Loosen
slightly
the
screw
which
secures
the
barrel
backstop
(located
at
the
right
front
corner
of
the
unit)
to
its
support.
This
screw
should
be
only
loose
enough
to allow
the
barrel
to
rotate
in its
sleeve
but not
so
loose
as to
allow the
sleeve
to move
within
the
support.
Unwind
the
barrel
backstop
so
that
the
moving
contact
arm
is permitted
to
swing
freely.
Adjust the
tension
of
each
low
gradient
contact
brush
so
that
one-to-two
grams
of
pressure
are
required
at the
contact
tip
in
order
to
cause
the end
of
the
brush
to
separate
from
the
inner face
of
its
respective
brush
retainer.
Adjust
the
spiral
spring
until
the
moving
contact
arm
is
in a neutral
position,
i.e.,
with
the
arm
pointing
directly
forward.
Loosen
the
locknut
which
secures
the
low
gradient
stationary
contact
mounting
screw
to
the
stationary
contact
support.
Wind
the
mounting screw
inward
until
the
low
gradient
stationary
and
movinq_contact members
just
begin
to
touch.
Unwind
the
mounting
screw
until
the
stationary
contact
brush
is vertical
with
the
stationary
con
tact
brush
retainer
down.
Then
tighten
the
locknut
which
secures
the
mounting
screw
to
the stationary
contact
support.
Loosen
slightly the
screw
which
secures
the
barrel contact
to
its
support.
This
screw
should
be only
loose
enough to
allow
the
barrel
to
rotate
in its
sleeve,
but
not so
loose
as
to
allow
the sleeve
to move
within
the
support.
Wind
the
barrel
backstop
in
until
the low
gradient
moving
and
stationary
contact
members
just
begin
to
touch.
Wind
the
barrel
contact
in
until
the
barrel contacts
just
begin
to
touch.
Unwind
the
barrel contact one—quarter
turn.
Tighten
the
screw
which
secures
the barrel contact
to
its
sup
port.
Make
sure
that
this
screw
is
not so
tight
that
it
prevents
the
ball
from
rolling
freely
within
the
barrel.
Finally, adjust
the tension
on
the
low
gradient stationary
contact
brush
such
that,
when
the
low
gradient
contacts
are
made
and
fully
wiped
in,
there
is approximately
an equal
deflection
on
each brush.
CAUTION:
When
the
above
adjustments are
complete,
be
sure
to
replace
the two
red jumper
leads.
Bias
Torque
Adjustment
The
diretional
unit
is provided with
a
notched
core
which
is used
to
minimize
the
torque
produced
in
the
rotor
by
current
alone
in
the operating coils
with
the
polarizing
circuits
de—energized.
This
adjust
ment
is
made
at
the
factory
and may
be
checked
as
follows:
First,
short
out
the
potential
polarizing
circuit.
Adjust
the
control
spring
so
that
the
moving
con
tact
structure
is
balanced
between
the
stationary
contact
and the
stop.
This
can
be
done
by loosening
the
hexagonal-head locking
screw,
which
clamps
the spring
adjusting
ring
in position,
and
turning
the
ring
to
the
left
until
the
balance
point
is
reached.
Energize
the
operating
circuit
with
30
amperes
and
check
that
the
contact
arm
does
not
move.
The
core
should
be
turned
in
small
steps
until
a
point
is
reached
where
there
is
no “bias” torque
from
current
alone
The core
can
be
turned
by loosening
the
large
hexagonal
nut
on the
bottom
of
the unit
and
turning
the
core
by
means
of the
slotted
bearing
screw.
This
screw
should
be
held
securely
in
position
when
the
nut
is re
tightened.
Keep
in
mind
that
currents
of
these
magnitudes
will
cause
the
coils
to
overheat
if
left
on too
long.
Therefore,
leave
the
test
current
on
only
for short
intervals
and
allow
sufficient
time
between
tests
for
the
coils
to cool.
After
the
torque adjustment has
been made,
the spiral
spring
should
be
set
to
have
barely
enough
ten
sion
to
swing
the
moving
contact
arm
against
the
stop
screw
when
the
unit
is de—energized.
Sufficient
tension
will
be
obtained
if
the
adjusting
ring
is
rotated
about
one-half
inch
from
the
neutral
position
in
the
counterclockwise
direction,
as
measured
on
the
periphery
of the
ring.
18

GEK-49850
Clutch
Adjustment
The connections shown in Fig. 22 for the polarity check can also be used in
making
the clutch
adjust
ment. The 50 ohm fixed resistor should
be replaced with an adjustable resistor capable of
providing
current up
to 10
aiiiperes. A
screw,
projecting from
the side
of the
moving contact arm, controls the clutch
pressure, and consequently, the current value which will cause the clutch to
slip.
With rated
frequency
and at rated volts, the clutch should
be
set
to
slip
in
the range of 5.5
to
8 amperes.
The
clutch slip is limited to approximately 20 degrees by means of a stop pin in
the
shaft. It
should
first be set
to
slip in the contact closing direction
at
the current values listed
in the table with
the
polarizing
circuit energized, but with the restraint circuit
open.
Then check that the clutch will slip
to the
limit
in the contact opening direction with the restraint circuit energized
at
rated volts and the
current circuit open.
INSTANTANEOUS OVERCURRENT UNIT (DIRECTIONALLY
CONTROLLED)
Bearings
The section
BEARINGS,
under
DIRECTIONAL UNIT,
also applies
to the bearings of the instantaneous over-
current unit.
Cup and Stator
The section CUP
AND STATOR under DIRECTIONAL
UNIT,
also applies to the cup
and stator
of
the
instan
taneous
overcurrent unit.
Contact
Adjustments
The contact gap
may be adjusted by loosening
slightly the screw at the
front of the contact
support.
The screw should be
only
loose enough to allow
tne contact barrel to rotate in its
sleeve.
The
backstop screw
fastened
with
a locknut
should
hold the moving
contact
arm
in a
neutral position,
i.e.,
with the arm
pointing directly forward.
Then, by rotating the barrel,
advance the stationary
contact
until it just
touches the moving contact.
Next, back it away
2/3
turn to
obtain approximately 0.020 inch
gap.
Last, tighten the screw
which secures the barrel.
The
moving
contact may be
removed
by loosening
the screw which secures
it
to the
contact arm and
sliding
it
from under the
screw
head.
Clutch Adjustment
The clutch
on the instantaneous overcurrent
unit
can
be adjusted by means
of
the
screw located on
the
right-hand side of the
moving contact arm. If the
locknut is loosened
and
the
screw turned in, the
current
at
which the
clutch will slip will be
increased. Place the tap
plugs in the lower range taps
(series).
Hold the directional unit contacts
closed. Adjust the clutch so
that the current at
which the cup just
starts
to slip
falls
within the
limits listed
in
Table 14.
TABLE 14
DIRECTIONALLY CONTROLLED IOC
UNIT CLUTCH
ADJUSTMENT
Suddenly
Applied
Current
Suddenly Applied Current
Pickup Range Clutch Must Not
Slip (Amps)
Clutch Must Slip
(Amps)
2—8 12
15
10-40
44
58
Note that too frequent or too long
application
of
these
currents will
overheat the coils
INSTANTANEOUS
UNIT (NON-DIRECTIONALLY CONTROLLED)
1. Both
contacts should close at the same time.
2.
The backing strip should be so
formed that the forked end (front)
bears against the
molded strip
under the
armature.
19

GEK-49850
3.
With
the
armature
against
the
pole piece,
the
cross
member
of
the
“T spring
should
be
in
a
hori
zontal
plane and
there
should
be
at
least
1/64
inch
wipe
on
the
contacts.
Check
this
by
inserting
a
0.010
inch
feeler
gage between
the
front
half of the
shaded
pole with
the armature
held
closed.
The
contacts
should
close
with
the
feeler
gage in
place.
CONTACT
CLEANING
For
cleaning
fine
silver
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
corroded
material
will
be
removed
rapidly
and
thoroughly.
The
flexibility
of
the
tool
insures
the
cleaning
of
the
actual points
of
contact.
Fine
silver
contacts
should
not
be
cleaned
with
knives,
files
or
abrasive
paper
or
cloth.
Knives
or
files
may leave
scratches
which
increase
arcing
and
deterioration
of
the
contacts.
Abrasive
paper
or
cloth
may leave
minute
particles
of
insulating
abrasive
material
in
the
contacts
thus preventing
contact
closing.
The
burnishing
tool described
above
can
be
obLained
from
the
factory.
RENEWAL
PARTS
It
is
recommended
that
sufficient
quantities
of
renewal
parts
be
carried
in
stock
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
part
wanted,
and
give
complete nameplate
data.
If
possible,
give
the
General
Electric
Company
requisition
number
on
which
the
relay
was
furnished.
Refer to
Renewal
Parts
Publication
GEF-409O.
20