GE IBCG51M*Y1A Series User manual

GEK-49822E
INSTRUCTIONS
GROUND
DIRECTIONAL
OVERCURRENT
RELAYS
TYPES
IBCG51M
IBCG51M(.-)Y1A
I BCG52M
IBCG53M
IBCG53M(—)Y1A
IBCG54M
IBCG77M
I
BCG78M
GE
Protection
and
Control
205
Great
Valley
Parkway
Malvern,
PA
19355-1337

GEK-4
9822
PAGE
DESCRIPTION
APPLICATION
RATINGS
TIME
OVERCURRENT UNIT
DIRECTIONAL UNIT
INSTANTANEOUS
UNIT
TARGET AND
SEAL-IN UNIT
CONTACTS
CHARACTERISTICS
PICKUP
RESET
(TIME OVERCURRENT
UNIT)...
OPERATING
TIME
BURDENS
CONSTRUCTION
DIRECTIONAL
UNIT
CONTACTS
TIME
OVERCURRENT
UNIT
TARGET SEAL-IN
UNIT
INSTANTANEOUS
UNIT
RECEIVING, HANDLING
AND
STORAGE
ACCEPTANCE
TESTS
VISUAL INSPECTION
MECHANICAL
INSPECTION
TOP
UNIT
(TOC)
BOTTOM UNIT (DIR)
TARGET
AND SEAL-IN UNIT!
INSTANTANEOUS
UNIT
13
DRAWOUT RELAYS,
GENERAL
14
POWER
REQUIREMENTS, GENERAL
14
TARGET
AND SEAL-IN UNIT
14
PICKUP
AND
DROPOUT
TEST
14
TIME
OVERCURRENT
UNIT
15
CURRENT
SETTING
15
TIME SETTING
16
PICKUP
TEST
16
TIME TEST
16
PAGE
3
DIRECTIONAL UNIT
17
4 CURRENT
POLARIZATION
17
5
POTENTIAL POLARIZATION
17
6 INSTANTANEOUS
UNIT
17
7
INSTALLATION
17
7
LOCATION
17
8
MOUNTING
18
8 CONNECTIONS
18
8
INSPECTION
18
8 CAUTION
18
9
OPERATION
18
9
TARGET AND SEAL-IN
UNIT
18
9
TIME OVERCURRENT
UNIT 18
11 DIRECTIONAL UNIT
19
11
CURRENT
POLARIZATION
19
11 POTENTIAL
POLARIZATION
19
11 INSTANTANEOUS
UNIT
ig
12 PERIODIC
CHECKS AND ROUTINE
12 MAINTENANCE
19
TARGET
AND
SEAL-IN UNIT
19
12
TIME OVERCURRENT
UNIT
19
13 DIRECTIONAL
UNIT
19
13 INSTANTANEOUS
UNIT
20
13 SERVICING
20
13 TARGET
AND
SEAL-IN
UNIT
20
13 TIME
OVERCURRENT
UNIT
20
DISK AND BEARINGS
20
CONTACT
ADJUSTMENT
20
CHARACTERISTICS
CHECK
AND
ADJUSTMENTS
20
DIRECTIONAL
UNIT
21
BEARINGS
21
CUP
AND STATOR
21
CONTACT ADJUSTMENTS
21
BIAS
TORQUE ADJUSTMENT
22
CLUTCH ADJUSTMENT
22
INSTANTANEOUS
UNIT
23
CONTACT
CLEANING
23
RENEWAL PARTS
23
CONTENTS
2

GEK—49822
GROUND
DIRECTIONAL
OVERCURRENT
RELAYS
TYPES
IBCG51M IBCG53M
IBCG77M
I
B
C
G 5
1
Fl
(
-
)
Y
1 A
I
BC
G
5
3M
(
-)
Y I A
I
BC 678
M
IBCG52M
IBCG54M
DESCRIPTION
The
Type
IBCG
relays
are
ground
directional
overcurrent
relays
used
primarily
for
the
protection
of
feeders
and
transmission
lines.
They
are available
with
either
inverse,
very
inverse
or
extremely
inverse
time
characteristics.
All
the
IBCG
relays
contain
a
time
overcurrent
unit
of
the
induction disk
type
and
an
instantaneous
directional
unit
of
the
induction
cup
type.
The directional
unit
can
be
potential polarized,
or
current
polarized,
or
both,
and
it
directionally
controls
the
operation
of
the
time
overcurrent
unit.
A
target
seal-in
unit
is
provided in
each
of
the
relays.
The
operating
coil
for
this
unit
is
connected
in
series
with
the
contacts
of
the
time
overcurrent
unit so
that
it
will
pick
up
whenever
the
time
overcurrent
unit operates.
The
contacts
of
the
seal-in
unit
are
connected
in
parallel
with
the
contacts
of
the
time
overcurrent
unit
to
provide
protection
for
them
and
their
associated
control springs.
Those
relays having
the
designation
Y1A
following
the
model
number
also contain
a
Hi—Seismic
instantaneous
overcurrent
unit
of the
hinged
armature
construction.
The
IBCG52M,
54M
and
the
78M
relay
models
are
the
two-contact
versions
of
the
IBCG51M,
53M
and
the
77M
relay
models
respectively.
All
the
IBCG
relays
are
mounted
in
standard
Ml
size
drawout
cases,
the
outline
and
panel
drilling
dimensions
for
which
are
given
in
Figure
26.
Internal connections
for
the
relays
are
given
in
Figure
5,
6,
7,
8
and
9.
Typical
external connections
are
shown by
Figures
10,
11
and
12.
Table
I
lists
the
various
models
and
ranges
that
are
available.
These
instructions
do
not
purport
to
cover
all
details or
variations
in
.quipaient
nor
to provide
for
every
possible
conttngency to
be
eet
In
connection with
installation,
operation or
,aint.nanc.. 5hould
further
infornation be
desired
or
should
particular problem
arise
which
are
not
covered
sufficxantly
for
the
purchaser’s
purposes, the
matter
should
be
referred
to
the
General
£I.ctrC Conça,29.
To
the
extent
required the
products described
herein
meet
applicable ANSI,
IEZ’E
and
RXNA
standards,
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly.
3

GEK—49822
TABLE
I
EXTENDED
RANGE
IBCG
RELAYS
• Relay
Time
Inst
Pickup
Range
mt
Model
Characteristic
Unit
Inst.
Time
Conn.
IBCG51M(-)A
Inverse
No
-
0.5-4,
2-16
Fig. 5
I IBCG52M(-)A
Inverse
No
-
0.5—4,
2-16
Fig.
7
II3CG51M(-)Y1A
Inverse
Yes
6-150
0.5—4,
2-16
Fig. 6
IBCG53M(-)A
Very
Inverse
No
-
0.5-4,
1.5-12 Fig.
5
IBCG54M(-)A
Very
Inverse
No
-
0.5-4,
1.5-12
Fig. 7
IBCG53M(—)Y1A
Very
Inverse
Yes
6-150 0.5-4,
1.5-12
Fig. 6
IBCG77M(-)A
Extremely
Inverse
No
- 0.5-4,
1.5-12
Fig.
8
IBCG78M(—)A
Extremely
Inverse
No
—
0.5—4,
1.5—12
Fig.
9
APPLICATION
The
Type
IBCG relays
are
ground
directional
overcurrent
relays
that
may
be
used
as
ground
fault
detectors
in
a transmission
line
protective
relaying
scheme.
The
relays
contain
a
time
overcurrent
unit
that
is
torque
controlled
by
an
instantaneous
directional
overcurrent
unit.
The
directional
unit
may
be polarized
from
a
source
of potential,
or
current,
or both
sources
may be
used to
dual
polarize
the
unit.
It
is
advantageous
to use
dual
polarization
because
changing
system
conditions
may
cause
current
polarization
to
be
favored at
some
times
whereas
voltage
polarization
might
be
favored at others.
Figure
13
illustrates
the
effect
of
using
dual
polarization
as
compared
to
polarization
from
a
source
of
voltage
or
current
alone.
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
extremely
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 current
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
operating
time
of
the time
overcurrent
unit for
any given
value of
current
and
tap setting
is determined
by
the
time-dial
setting.
The
operating
time is inversely
proportional
to the
current magnitude
as illustrated
by
the time
curves
in Figures
4

G[K-49822
15, 16
and 17.
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
8
ampere
tap as
for 50
amperes
on
the 5
ampere
tap, since
in
both
cases the current
is
10
times 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
ViA
relays
contain a
Hi-Seismic instantaneous
overcurrent
unit.
This unit may
be set high to
trip directly
for faults some
distance
down
the transmission
line.
In determining
the setting for
this
unit,
it
will
be necessary
to consider
faults
directly
behind
the relay
as
well
as
at the
remote
terminal, because
the
unit
is
non-directional.
The unit
should be set
with
a suitable amount
of
margin
above
the
maximum
external fault current.
The
effects
of
transient
overreach,
as
illustrated
in
Figure
19, should also
be taken into account
in
determining
the
setting.
RATINGS
The IBCG
relays described
in
this instruction
are available in
50 and 60
hertz
models.
The TOC (time
overcurrent)
units
have extended
(8-to—i) range
similar
to
the 800 series
IAC
relays. The
IOC (instantaneous
overcurrent)
units, when
used
(see
Table
I), have extended
(25—to-i) range.
Ratings
of
the
operating
current
circuits
of
the TOC,
JOC
and
the
directional units
are shown individually.
However,
since
all
operating
current circuits
are
normally connected
in
series, the
operating
coil ratings
of all units
should
be
considered in determining
the rating
of
the
entire
operating circuit.
TABLE H
ONE
SECOND RATING OF
TOC UNITS
Relay
Range
One
Second
Model
(Amps)
Rating (Amps)
IBCG51M
0.5-4.0
70
IBCG51M(—
)V1A
IBCG52M
2.0-16
260
IBCG53M
0.5—4.0
140
IBCG53M(-
)Y1A
IBCG54M
1.5-12
260
IBCG77M
0.5-4.0
125
IBCG78M
1.5-12
260
5

GEK—49822
TIME
OVERCURRENT
UNIT
The
1
second
ratings
of
the
TOC
units
are
given
in
Table
II.
The
continuous ratings
for
the
various
taps of
each
model
and
current
range
are
given
in
Tables
III,
IV
and
V.
TABLE
III
CONTINUOUS RATING
OF 0.5-4.0 AMP
TOC
UNITS
0.5-4.0
Amp
Range
Model
Tap
0.5
0.6
0.7 0.8
1.0
1.2
1.5
2.0
2.5 3.0 4.0
IBCG51M
IBCG51M(-)Y1A
Rating
1.6
1.8
2.0
2.1
2.3 2.7
3.0
3.5
4.0
4.5 5.0
IBCG5?M
(Amps)
IBCG53M
IBCG53M(—)Y1A
4.0
4.5
5.5
5.5
6.0 7.0 7.5
9.0
10.0
11.0 13.0
IBCG54M
IBCG77M
IBCG78M
3.5
3.7
4.0
4.5
5.0
5.5
6.0 7.0
8.0
9.0
10.0
TABLE
IV
CONTINUOUS
RATING
OF
1.5-12.0
AMP TOC
UNITS
1.5-12.0
Amp
Range
Model
Tap
1.5
2.0
2.5
3.0
4.0
5.0
6.0
7.0
8.0
10.0
12.0
IBCG53M
Rating
IBCG53M(-)Y1A
10.0
11.5
13.0
14.5
17.0
19.0
21.0 23.0
23.5 27.5
30.5
IBCG54M
(Amps)
r
IBCG77M
IBCG78M
9.5
10.5 11.5
12.5 14.0
15.5
17.0
18.0 19.0
20.0 20.0
6

GEK-49822
TABLE
V
CONTINUOUS RATING
OF
2-16.0 AMP TOC
UNITS
2-16.0
Amp
Range
Model Tap
2.0 2.5
3.0 4.0
5.0
6.0 7.0
8.0 10.0 12.0
16.0
IBCG51M
Rating
IBCG51M(-)Y1A
8.0
9.0 10.0
12.0
14.0 15.0
16.0
17.5
20.0 20.0
20.0
IBCG52M
(Amps)
9.5
10.5 11.5 12.5
14.0
15.5
17.0
18.0 19.0 20.0 20.0
DIRECTIONAL
UNIT
The
directional unit
current
polarizing
and operating
coils have a
continuous rating
of
5 amperes and a 1
second rating
of 150 amperes.
The potential
polarizing coils
will
withstand
120
volts continuously
and
360
volts
for 60
seconds.
INSTANTANEOUS
UNIT
The
instantaneous unit
coil is of
the
hinged
armature construction
and is
tapped
for
operation on either
one of two ranges
(H or L).
Selection of the
high or low
range
is
accomplished
by the
positioning of leads
T
and
E
at terminal
6.
See Table VI
and
the applicable
internal
connections
diagrams
referred
to in
Table
I.
For
the H
range,
connect lead
T
to
terminal 6
and
lead
E
to
the
auxiliary
terminal
that is
mounted on terminal
6.
For
range
L,
reverse
leads
T
and
E.
TABLE
VI
CONTINUOUS
AND ONE
SECOND
RATINGS
OF lOG
UNIT
One
Continuous
Second
Instantaneous
Range
Rating Rating
Unit
(Amps)
Range
(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—29,
28-150. There
will
always
be
at
least
1 ampere overlap between
the maximum
L
setting and
the
minimum
H setting.
Whenever
possible,
be sure
to select the higher range,
since it
has the higher continuous
rat i
n
g.
7

GEK-49822
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
VII.
The
tap
setting
used
will
depend
on
the
current
drawn
by
the
trip
coil.
TABLE
VII
SEAL-IN
UNIT
RATINGS
TAP
0.2
—
2.0
DC
RESISTANCE
+10%
(OHMS)
8.3
0.24
MIN
OPERATING
(AMPERES)
+0-25%
0.2 2.0
CARRY
CONT.
(AMPERES)
0.37
2.3
CARRY
30 AMPS
FOR
(SEC.)
0.05
2.2
CARRY
10
AMPS FOR
(sEC.)
0.45
20
60
Hz
IMPEDANCE
(OHMS)
50.0
0.65
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
2
amperes,
there
is
a
possibility
that
the
resistance
of
7
ohms
will
reduce
the
current
to
so
low
a
value
that
the
breaker
will
not
be
tripped.
The
2.0
ampere
tap
should
be
used
with
trip
coils
that
take
2
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
connec
tions
should
be
arranged
so
that
the
induction
unit
contacts
will
operate
an
auxili
ary
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.
CONTACTS
The
current-closing
rating
of
the
induction
unit
is
30
amperes
for voltages
not
exceeding
250
volts.
Their
current-carrying rating
is
limited
by
the
tap
rating
of
the
seal—in
unit.
CHARACTERISTI
Cs
PICKUP
When
potential polarized,
the
directional
unit
will
pick
up
at
3.6
volts-amperes
at
the
maximum
torque
angle
of
60°
lag
(current
lags
voltage).
When
current
polarized,
it
will
pick
up
at
approximately
0.5
ampere
with
the
operating
and
polarizing
coils
connected
in
series.
The
performance
of
the
unit
with
simultaneous
current
and
potential
polarization
is
typified
in
Figure
13.
8

GEK—49822
The
current
required
to close
the time
overcurrent
unit
contacts
will be
within
5%
of
the tap screw
setting.
RESET
(TIME
OVERCURRENT UNIT)
Inverse
time overcurrent
units reset at
90%
of
the
minimum
pickup
current, very
inverse
time
units at
80%,
and
extremely
inverse time
units
at
85%.
When the
relay is
de-energized,
the time required
for the disk
to
completely
reset
to the
number 10 time
dial
position
is approximately
6
seconds
for inverse time
relays,
and 60 seconds
for very
inverse
time and
extremely
inverse
time
relays.
OPERATING
TIME
The time curve
for the directional
unit is
shown
in Figure
14.
The
time
curves
of the
time
overcurrent
unit are shown in
Figures
15, 16
and 17,
respectively
for inverse,
very inverse
and extremely
inverse
time relays.
For the
same
operating
conditions, the
relay will operate
repeatedly
within
1
or 2%
of the
same
time.
The
time-current
characteristic
of
the Hi-Seismic
instantaneous
unit
is shown
by
Figure
18 and its
transient
overreach
characteristic is
shown
by Figure 19.
BURDENS
The
capacitive
burden of
the potential polarizing
circuit of
the directional
unit
at
60 cycles
and 120 volts
is
10
volt amperes
at 0.86
power factor. Table
VIII
gives
the
current
circuit burdens of
the directional
unit.
TABLE
VIII
DIRECTIONAL UNIT
CURRENT
CIRCUIT
BURDEN AT 60
CYLES AND 5
AMPERES
Circuit
Z
(Ohms) VA
P.F Watts
perating
0.46 12.0
0.52 6.24
Polarizing 0.24
6.0
0.95
5.27
Table
IX gives
the
current circuit
burdens
of
time
overcurrent
units.
Ordinarily
the potential
circuit
is in the
open
corner of
broken
delta potential
transformers
and
the
current
circuits
are in
the
residual
circuits
of
current
transformers.
The burden
is, therefore,
only
imposed
for
the
duration of
the
ground
fault
and need
be considered
only for this
brief
period. Table
X gives
the burden
of
the
instantaneous
unit.
9

GEK-49822
TABLE IX
CURRENT CIRCUIT
BURDENS AT
60
CYCLES OF THE TOC
UNIT
Tap Burdens at Minimum Pickup Ohms
Impedance at
*VA
Time
Range
Eff.Res. React.
**Imped
+Volt 3
Times 10
Times
At
Fivc
Characteristic
(Amps) (Ohms) (Ohms)
(Ohms) Amps
P.F. Mm P.U. Mm P.U.
Amperes
Inverse 0.5/4
5.60 21.0 22.0
5.5 0.25 10.80
5.00 555.0
Inverse 2/16 0.37 1.44
1.49 5.8
0.25 0.65
0.32
36.3
Very Inverse 0.5/4 1.40 3.90 4.15 1.0 0.33 4.20 2.90 104.0
Very
Inverse
1.5/12
0.23 0.53 0.58
1.3
0.40
0.58 0.36
14.5
Extr. Inverse 0.5/4 0.80 1.38 1.60 0.4 0.50
1.60 1.60 40.0
Extr. Inverse
1.5/12 0.005
0.147
0.17 0.4
0.50
0.17 0.17 4.25
**The
impedance
values
given are those
for the minimum 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
Type IBCG51M relay,
0.5/4
amperes, the impedance
of the 0.5
ampere
tap is 22
ohms.
The
impedance
of
the 1
ampere tap, at 1
ampere,
is
approximately
(0.5/1)2
x 22
= 5.5
ohms.
+
Some
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
5
amperes
is
used for this
purpose.
4
Calculated from
burden at
minimum pickup.
TABLE X
BURDEN
OF
THE INSTANTANEOUS UNIT
Inst.
Mm. Burden at
Mm Burden
Ohms
(Z)
Unit
Range
Pickup Pickup
(Ohms)
Times Pickup
Amps
Hz
Range
Amps Amps
R
Z
3 10 20
6-150 60
L 6-30
6
0.110 0.078
0.135 0.095
0.081 0.079
H
30-150 30 0.022 0.005
0.023 0.022 0.022 0.222
10