NATIONAL SWITCHGEAR HFC21B User manual
GEK
-
49826
CONTENTS
PAGE
3
DESCRIPTION
APPLICATION
CONSTRUCTION
RATINGS
CONTACTS
BURDENS
CHARACTERISTICS
RECEIVING
,
HANDLING
AND
STORAGE
ACCEPTANCE
TESTS
GENERAL
VISUAL
INSPECTION
MECHANICAL
INSPECTION
DRAWOUT
RELAYS
,
GENERAL
POWER
REQUIREMENTS
,
GENERAL
HI
-
SEISMIC
INSTANTANEOUS
UNIT
INSTALLATION
INSTALLATION
TESTS
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
CONTACT
CLEANING
COVER
CLEANING
SYSTEM
TEST
SERVICING
HI
-
SEISMIC
INSTANTANEOUS
UNIT
RENEWAL
PARTS
LIST
OF
FIGURES
3
4
4
5
5
5
6
6
6
7
7
7
7
8
8
8
9
9
9
9
9
9
10
11
(
Cover
Photo
8043211
)
2
Courtesy of NationalSwitchgear.com
GEK
-
49826
INSTANTANEOUS
OVERCURRENT
RELAYS
TYPES
:
HFCC
21
B
,
HFC
22
B
,
HFC
23
C
DESCRIPTION
The
Type
HFC
relays
covered
by
this
instruction
book
consist
of
one
or
more
hinged
armature
instantaneous
overcurrent
units
,
contacts
,
assembled
in
a
type
Cl
single
end
drawout
case
.
rating
and
are
identified
by
the
letters
"
Hi
-
G
"
molded
into
the
target
block
,
unit
includes
a
target
button
,
which
is
raised
into
view
and
latched
,
when
the
unit
picks
up
.
The
targets
are
manually
reset
by
a
button
on
the
front
of
the
relay
The
various
relay
types
differ
only
in
the
number
of
units
included
in
the
case
,
as
tabulated
below
:
each
with
two
electrically
separate
The
units
have
a
hi
-
seismic
Each
cover
.
RELAY
TYPE
NUMBER
OF
UNITS
HFC
21
B
HFC
22
B
HFC
23
C
1
2
3
APPLICATION
The
Type
HFC
relays
are
generally
applied
where
a
direct
trip
instantaneous
overcurrent
function
is
required
.
Typical
applications
are
on
transmission
lines
to
supplement
existing
distance
relays
,
or
pilot
schemes
,
with
instantaneous
overcurrent
relays
set
to
detect
severe
close
-
in
faults
;
or
in
the
distribution
area
,
in
combination
with
time
overcurrent
relays
,
and
an
automatic
reclosing
scheme
,
to
provide
coordination
with
branch
fuses
,
instantaneous
units
in
these
applications
,
their
transient
overreach
characteristic
(
shown
in
Figure
7
)
must
be
considered
.
The
percent
transient
overreach
must
be
applied
to
proportionately
increase
the
calculated
pickup
setting
so
that
the
instantaneous
units
will
not
overreach
a
downstream
device
,
thereby
causing
loss
of
coordination
in
the
system
protection
scheme
.
When
determining
the
pickup
setting
of
the
The
Type
HFC
21
B
can
be
applied
with
a
doughnut
-
type
current
transformer
encircling
the
three
phase
conductors
(
ground
sensor
scheme
)
,
to
provide
sensitive
ground
fault
protection
.
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
,
further
information
be
desired
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for
the
purchaser
'
s
purposes
,
the
matter
should
be
referred
to
the
General
Electric
Company
.
To
the
extent
required
the
products
described
herein
meet
applicable
ANSI
,
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
Should
IEEE
and
NEMA
standards
;
3
Courtesy of NationalSwitchgear.com
GEK
-
49826
The
Type
HFC
23
C
relay
can
be
used
to
provide
differential
protection
of
a
motor
,
usually
by
means
of
the
self
-
balancd
primary
current
scheme
shown
in
Figure
6
.
the
current
transformers
mounted
at
the
machine
terminals
,
as
indicated
in
this
figure
,
the
cables
between
the
circuit
breaker
and
the
machine
are
not
included
in
the
differential
zone
.
Therefore
,
the
switchgear
equipment
should
include
some
form
of
overcurrent
relaying
,
operating
from
current
transformers
located
at
the
circuit
breakers
,
for
protection
of
these
cables
.
With
CONSTRUCTION
The
Type
HFC
relays
consist
of
a
molded
case
,
cover
,
support
structure
assembly
and
a
connection
plug
to
make
up
the
electrical
connection
.
See
cover
figure
,
and
Figures
1
,
2
and
12
.
The
drawout
connection
/
test
system
for
the
Cl
case
,
shown
in
Figure
11
,
has
provisions
for
14
connection
points
,
and
a
visible
CT
shorting
bar
located
in
the
front
.
As
the
connection
plug
is
withdrawn
,
it
clears
the
shorter
contact
brushes
in
the
output
contact
circuits
first
.
Thus
,
the
trip
circuit
is
opened
before
any
other
circuits
are
disconnected
.
Next
,
the
current
circuit
brushes
on
the
case
connection
block
engage
the
shorting
bar
(
located
at
the
lower
front
of
the
case
)
to
short
circit
external
current
transformer
secondary
connections
.
The
window
provides
visual
confirmation
of
CT
shorting
.
The
connection
plug
then
clears
the
current
circuit
contact
brushes
on
the
case
,
and
finally
those
on
the
relay
support
structure
,
to
completely
de
-
energize
the
drawout
element
.
The
instantaneous
unit
is
a
small
hinged
or
armature
type
unit
,
with
two
electrically
separate
contacts
mounted
on
the
support
structure
,
instantaneous
unit
picks
up
,
it
raises
a
target
which
latches
up
and
remains
exposed
until
it
is
released
by
pressing
a
button
,
located
on
the
upper
left
side
of
the
cover
.
The
instantaneous
unit
has
the
letters
"
Hi
-
G
"
molded
into
the
target
block
to
distinguish
it
as
a
hi
-
seismic
unit
.
The
seismic
fragility
level
exceeds
peak
axial
acceleration
of
10
g
'
s
(
4
g
ZPA
)
when
tested
using
a
biaxial
multi
-
frequency
input
motion
to
produce
a
required
response
spectra
(
RRS
)
in
accordance
with
the
Standard
for
Seismic
Testing
of
Relays
,
ANSI
37.98
-
1978
.
When
the
RATINGS
The
relays
are
designed
for
operation
in
an
ambient
air
temperatures
from
minus
20
°
C
to
plus
55
°
C
.
Ranges
are
shown
in
Table
1
.
TABLE
1
Current
Range
(
Amperes
)
Frequency
(
Hertz
)
Relay
HFC
21
B
HFC
22
B
HFC
23
C
50
/
60
0.5
-
4
and
2
-
50
4
Courtesy of NationalSwitchgear.com
GEK
-
49826
The
instantaneous
units
have
a
tapped
coil
for
operation
on
either
one
or
two
ranges
,
HIGH
(
H
)
or
LOW
(
L
)
.
Selection
of
the
HIGH
or
LOW
range
is
determined
by
the
position
of
the
link
located
on
the
top
of
the
support
structure
(
see
Figure
1
and
Table
2
)
.
TABLE
2
*
*
*
0
ne
Second
Rating
(
Amps
)
Hi
-
Seismic
Instantaneous
Unit
(
Amps
)
Continuous
Rating
(
Amps
)
Link
Position
*
*
Range
(
Amps
)
K
0.5
-
2
0.75
L
8
,
836
94
0.5
-
4
1.5
H
2
4
10
3.7
2
L
16
,
900
130
2
-
50
10
-
50
H
7.5
*
*
The
range
is
approximate
,
which
means
that
the
2
-
10
amp
range
may
be
2
-
8
amps
,
and
the
10
-
50
amp
range
may
be
8
-
50
amps
.
There
will
always
be
at
least
one
ampere
overlap
between
the
maximum
L
setting
and
the
minimum
H
setting
.
Always
select
the
higher
range
whenever
possible
,
since
it
has
a
higher
continuous
rating
.
*
*
*
Higher
currents
may
be
applied
for
shorter
lengths
of
time
in
accordance
with
the
formula
:
I
=
/
KTF
CONTACTS
The
contacts
will
carry
30
amperes
trip
current
.
BURDENS
The
hi
-
seismic
instantaneous
unit
burdens
are
listed
in
Table
3
.
CHARACTERISTICS
The
instantaneous
units
have
either
a
25
to
1
or
an
8
to
1
range
with
a
tapped
coil
.
There
are
high
and
low
ranges
,
selected
by
means
of
links
located
on
the
top
of
the
support
structure
(
see
Figure
1
)
.
The
time
current
curve
for
the
instantaneous
units
is
shown
in
Figure
8
.
5
Courtesy of NationalSwitchgear.com
GEK
-
49826
TABLE
3
Burden
in
Ohms
(
Z
)
Times
Pickup
Hi
-
Seismic
Inst
.
Unit
(
Amps
)
Burden
at
Minimum
Pickup
(
Ohms
)
Minimum
Pickup
(
Amps
)
Link
Position
Range
(
Amps
)
JX
10
20
Hz
R
Z
3
10.63
9.81
8.56
7.80
L
0.5
-
2
2
-
4
14.44
0.5
9.77
0.5
-
4
60
4.18
H
6.21
4.26
5.13
4.66
2
3.49
0.480
0.071
0.457
0.070
2
-
10
10
-
50
0.634
0.072
L
2
0.750
0.070
0.650
0.024
0.992
0.074
2
-
50
60
H
10
7.13
6.50
8.18
L
0.5
-
2
2
-
4
8.14
12.03
0.5
8.86
0.5
-
4
50
3.48
3.55
H
2.91
5.18
3.88
4.28
2
0.380
0.058
0.400
0.059
0.528
0.060
L
2
-
10
10
-
50
0.827
0.062
2
0.625
0.0
58
0.542
0.020
2
-
50
50
H
10
RECEIVING
,
HANDLING
AND
STORAGE
These
relays
,
when
not
included
as
part
of
a
control
panel
will
be
shipped
in
cartons
designed
to
protect
them
against
damage
.
Immediately
upon
receipt
of
a
relay
,
examine
it
for
any
damage
sustained
in
transit
,
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
damaged
or
the
adjustments
disturbed
.
If
the
relays
are
not
to
be
installed
immediately
,
they
should
be
stored
in
their
original
cartons
in
a
place
that
is
free
from
moisture
,
dust
and
metallic
chips
.
Foreign
matter
collected
on
the
outside
of
the
case
may
find
its
way
inside
when
the
cover
is
removed
,
and
cause
trouble
in
the
operation
of
the
relay
.
If
damage
resulting
from
rough
ACCEPTANCE
TESTS
GENERAL
The
relay
should
be
examined
and
tested
upon
delivery
to
ensure
that
no
damage
has
been
sustained
in
shipment
and
that
the
relay
calibrations
have
not
been
disturbed
,
examination
or
test
indicates
that
a
readjustment
is
necessary
,
refer
to
the
section
on
SERVICING
.
If
6
Courtesy of NationalSwitchgear.com
GEK
-
49826
The
following
tests
may
be
performed
as
part
of
the
installation
of
the
relay
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
the
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
the
screws
are
tight
.
MECHANICAL
INSPECTION
The
armature
and
contacts
of
the
instantaneous
unit
should
move
freely
when
operated
by
hand
.
There
should
be
at
least
1
/
64
-
inch
wipe
on
the
instantaneous
contacts
.
1
.
The
target
in
the
instantaneous
unit
must
come
into
view
and
latch
when
the
armature
is
operated
by
hand
,
and
should
unlatch
when
the
target
release
button
is
operated
.
2
.
Make
sure
that
the
brushes
and
shorting
bars
agree
with
the
internal
connections
diagram
.
3
.
If
there
is
a
need
to
tighten
any
screws
,
DO
NOT
OVERTIGHTEN
.
Overtightening
may
cause
stripping
.
CAUTION
:
DRAWOUT
RELAYS
,
GENERAL
The
HFC
relays
may
be
tested
without
removing
them
from
the
panel
by
using
the
12
XCA
11
A
1
four
-
point
test
probes
.
These
test
probes
make
connections
to
both
the
relay
and
the
external
circuitry
,
which
provides
maximum
flexibility
,
but
requires
reasonable
care
in
use
,
since
a
CT
shorting
jumper
is
necessary
when
testing
.
The
CT
circuit
may
also
be
tested
by
using
an
ammeter
with
the
12
XCA
11
A
2
.
See
the
test
circuit
of
Figure
9
.
Figure
9
shows
test
connections
for
the
HFC
21
B
current
transformer
,
and
the
left
unit
current
transformer
of
the
HFC
22
B
and
HFC
23
C
.
To
test
the
CTs
of
the
HFC
22
B
and
HFC
23
C
,
refer
to
internal
connections
shown
in
Figures
4
and
5
,
respectively
.
NOTE
:
POWER
REQUIREMENTS
,
GENERAL
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
.
All
alternating
current
operated
devices
are
affected
by
frequency
.
7
Courtesy of NationalSwitchgear.com
GEK
-
49826
Therefore
,
in
order
to
properly
test
alternating
current
relays
it
is
essential
to
use
a
sine
wave
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
)
,
would
be
essentially
affected
by
non
-
sinusoidal
waveforms
.
Hence
a
resistance
-
limited
circuit
,
as
shown
in
Figure
10
,
is
recommended
.
HI
-
SEISMIC
INSTANTANEOUS
UNIT
Make
sure
that
the
instantaneous
unit
link
is
in
the
correct
position
for
the
range
in
which
it
is
to
operate
.
Use
the
higher
range
whenever
possible
,
since
the
higher
range
has
a
higher
continuous
rating
.
Test
connections
for
testing
pickup
and
operating
times
are
shown
in
Figure
10
.
Figure
10
shows
test
connections
for
the
HFC
21
B
and
the
left
unit
of
the
HFC
22
B
and
HFC
23
C
.
To
test
the
other
units
of
the
HFC
22
B
and
HFC
23
C
,
refer
to
internal
connections
shown
in
Figures
4
and
5
,
respectively
.
Setting
the
Hi
-
Seismic
Instantaneous
Unit
NOTE
:
The
instantaneous
unit
has
an
adjustable
core
located
at
the
top
of
the
unit
as
shown
in
Figure
1
.
To
set
the
instantaneous
unit
to
a
desired
pickup
,
loosen
the
locknut
and
adjust
the
core
.
Turning
the
core
clockwise
decreases
the
pickup
;
turning
it
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
.
REFER
TO
TABLE
2
FOR
THE
CONTINUOUS
AND
ONE
SECOND
RATINGS
OF
THE
INSTANTANEOUS
UNIT
.
DO
NOT
EXCEED
THESE
RATINGS
WHEN
APPLYING
CURRENT
TO
THE
INSTANTANEOUS
UNIT
.
CAUTION
:
The
range
of
the
instantaneous
unit
(
see
Table
2
)
must
be
obtained
between
a
core
position
of
one
-
eighth
of
a
turn
fully
clockwise
,
and
20
turns
counterclockwise
from
the
fully
clockwise
position
.
Do
not
leave
the
core
in
the
fully
clockwise
position
.
INSTALLATION
The
relay
should
be
installed
in
a
location
that
is
clean
,
dry
,
free
from
dust
,
and
well
lighted
to
facilitate
inspection
and
testing
.
The
relay
should
be
mounted
on
a
vertical
surface
.
The
outline
and
panel
drilling
dimensions
are
shown
in
Figures
12
and
13
.
Figure
12
shows
semi
-
flush
mounting
,
and
Figure
13
shows
various
methods
of
surface
mounting
.
The
internal
connections
diagrams
for
the
relays
are
shown
in
Figures
3
,
4
and
5
.
INSTALLATION
TESTS
The
following
tests
are
to
be
performed
at
the
time
of
installation
:
8
Courtesy of NationalSwitchgear.com
GEK
-
49826
Hi
-
Seismic
Instantaneous
Unit
Select
the
desired
range
by
setting
the
link
in
the
proper
position
(
see
Figure
1
and
the
internal
connections
diagram
)
.
Always
select
the
higher
range
whenever
possible
,
since
it
has
a
higher
continuous
rating
.
Set
the
instantaneous
unit
to
pick
up
at
the
desired
current
level
.
See
"
Setting
the
Instantaneous
Unit
"
in
the
ACCEPTANCE
TESTS
section
.
All
the
tests
described
under
INSTALLATION
must
be
performed
at
the
time
of
installation
.
In
addition
,
if
those
test
described
under
the
ACCEPTANCE
TESTS
section
were
not
performed
prior
to
installation
,
it
is
recommended
that
they
be
performed
at
this
time
.
1
.
2
,
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
,
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
.
The
interval
between
CONTACT
CLEANING
A
flexible
burnishing
tool
should
be
used
for
cleaning
relay
contacts
.
This
is
a
flexible
strip
of
metal
with
an
etched
-
roughened
surface
,
which
in
effect
resembles
a
superfine
file
.
The
polishing
action
of
this
file
is
so
delicate
that
no
scratches
are
left
on
the
contacts
,
yet
it
cleans
off
any
corrosion
thoroughly
and
rapidly
,
flexibility
of
the
tool
insures
the
cleaning
of
the
actual
points
of
contact
.
Do
not
use
knives
,
files
,
abrasive
paper
or
cloth
of
any
kind
to
clean
relay
contacts
.
The
COVER
CLEANING
Lexar
^
cover
should
be
cleaned
with
a
soft
cloth
and
water
only
.
Use
of
cleaning
solutions
other
than
water
may
No
The
clear
cleaning
solutions
should
be
used
,
damage
the
clear
cover
.
SYSTEM
TEST
Although
this
instruction
book
is
intended
primarily
to
check
and
set
the
HFC
relay
,
overall
functional
tests
to
check
the
system
'
s
operation
are
recommended
at
intervals
based
on
the
customer
'
s
experience
.
SERVICING
HI
-
SEISMIC
INSTANTANEOUS
UNIT
Both
contacts
should
close
at
the
same
time
.
1
.
©
Registered
trademark
of
the
General
Electric
Co
.
9
Courtesy of NationalSwitchgear.com
GEK
-
49826
With
the
armature
against
the
pole
piece
,
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
.
Contacts
should
close
with
the
feeler
gage
in
place
,
mechanical
adjustments
may
affect
the
seismic
fragility
level
,
it
is
advised
that
no
mechanical
adjustments
be
made
if
seismic
capability
is
of
concern
.
2
.
Since
RENEWAL
PARTS
Sufficient
quantities
of
renewal
parts
should
be
kept
in
stock
for
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
the
name
of
the
part
wanted
,
quantity
required
,
and
complete
nameplate
data
,
including
the
serial
number
,
of
the
relay
.
Since
the
last
edition
,
Figures
12
and
13
have
been
changed
.
10
Courtesy of NationalSwitchgear.com
GEK
-
49826
LIST
OF
FIGURES
PAGE
FIGURE
12
Type
HFC
23
B
Relay
Removed
from
Case
,
Front
View
Type
HFC
23
B
Relay
Removed
from
Case
,
Rear
View
Internal
Connections
for
Type
HFC
21
B
Relay
,
Front
View
Internal
Connections
for
Type
HFC
22
B
Relay
,
Front
View
1
12
2
3
13
4
14
5
Internal
Connections
for
Type
HFC
23
C
Relay
,
Front
View
15
External
Connections
for
Type
HFC
23
C
,
Self
-
Balancing
Primary
Current
Differential
Scheme
for
Motor
Protection
6
16
Transient
Overreach
Characteristics
of
the
Hi
-
Seismic
Instantaneous
Unit
7
17
Time
-
Current
Characteristics
of
the
Hi
-
Sesimic
Instantaneous
Unit
8
18
Test
Connections
for
Testing
Current
Transformer
Secondary
Used
with
the
HFC
Relay
9
19
10
Test
Connections
for
Testing
Pickup
and
Operating
Times
of
the
Type
HFC
Relay
Hi
-
Seismic
Instantaneous
Unit
20
11
Cross
Section
of
Type
HFC
Drawout
Case
Showing
Shorting
Bar
Outline
and
Panel
Drilling
for
Type
HFC
Relay
Outline
and
Panel
Drilling
for
Type
HFC
Relay
21
12
22
13
23
11
Courtesy of NationalSwitchgear.com
GEK
-
49826
RANGE
SELECTION
LINKS
INSTANTANEOUS
UNIT
ADJUSTABLE
CORE
INSTANTANEOUS
UNIT
TARGET
Figure
1
(
8043212
)
Type
HFC
23
B
Relay
,
Removed
From
Case
,
Front
View
RANGE
SELECTION
LINKS
INSTANTANEOUS
UNIT
ADJUSTABLE
CORE
TARGET
RESET
MECHANISM
SUPPORT
STRUCTURE
Figure
2
(
8043213
)
Type
HFC
23
B
Relay
,
Removed
from
Case
,
Rear
View
12
Courtesy of NationalSwitchgear.com
GEK
-
49826
I
NSTANTANEOIJS
UNITS
RIGHT
\
\
n
RIGHT
INST
.
LEFT
INST
.
B
B
LEFT
T
T
E
E
.
o
o
~
o
C
p
D
V
\
/
L
H
H
L
V
V
*
V
v
v
v
v
~
—
v
\
j
/
V
V
*
o
o
o
o
2
4
10
6
c
o
o
o
1
3
5
9
INST
.
SETTINGS
SET
LINK
TO
"
Hft
FOR
HIGH
RANGE
AND
TO
"
L
"
FOR
LOW
RANGE
.
LINK
SHOWN
IN
HIGH
RANGE
POSITION
.
=
SHORT
FINGERS
Figure
4
(
0275
A
1900
-
0
)
Type
HFC
228
Internal
Connections
Diagram
,
Front
View
14
Courtesy of NationalSwitchgear.com
GEK
-
49826
INSTANTANEOUS
UNITS
RIGHT
LEFT
INST
.
MIDDLE
INST
.
RIGHT
INST
.
MIDDLE
B
B
B
LEFT
T
T
T
E
E
E
o
at
)
O
QD
oat
)
H
L
L
H
L
H
V
V
.
v
V
—
V
v
—
-
v
v
—
v
V
V
-
8
10
4
2
6
12
0
o
o
o
o
o
3
5
7
9
I
I
INSTANTANEOUS
SETTINGS
SET
LINK
TO
"
H
‘
FOR
HIGH
RANGE
AND
TO
'
vL
"
FOR
LOW
RANGE
.
LINK
SHOWN
IN
HIGH
RANGE
POSITION
.
Figure
5
(
0285
A
6295
-
0
)
Internal
Connections
for
Rel
ay
Type
HFC
23
C
,
Front
View
15
Courtesy of NationalSwitchgear.com
GEK
-
49826
BUS
87
-
HFC
23
C
52
-
CIRCUIT
BREAKER
2
3
I
1
1
I
52
87
7
.
8
-
^
v
—
I I
.
1 2
—
—
r
-
£
;
E
“
1
{
+
)
ALARM
BUS
<
+
>
TRIP
BUS
6
t
3
<
N
0
TE
I
)
(
NOTE
I
)
4
MOTOR
d
=
Q
_
7
4
r
67
riz
87
^
87
-
Lg
2
-
1
-
87
2
5
-
1
-
52
a
TO
ALARM
NOTE
LAS
AN
OPTION
,
CONNECTING
STUD
3
TO
(
+
)
ALARM
BUS
WILL
PROVIDE
AN
ALARM
WHEN
RELAY
CONNECTION
PLUG
IS
REMOVED
.
DO
NOT
USE
THIS
KIND
OF
CONNECTION
ON
THE
TRIP
CIRCUIT
SINCE
A
FALSE
TRIP
WOULD
OCCUR
.
TC
(
-
)
Figure
6
(
0285
A
7123
-
0
)
External
Connections
for
Type
HFC
23
C
,
SelfBalancing
Primary
Current
Differential
Scheme
for
Motor
Protection
16
Courtesy of NationalSwitchgear.com
HI
SEISUC
RATED
INSTANTANEOUS
UNIT
TRANSIENT
OVERREACH
~
n
co
c
A
=
PICKUP
CURRENT
GRADUALLY
APPLI
ED
B
«
CURRENT
SUDDBJLY
APPLIED
PERCENT
OVERREACH
-
100
-
s
fD
50
o
rv
>
o
o
“
*
>
CO
5
-
^
IE
4
^
MO
S
—
i
i
ro
co
—
"
o
ct
ft
)
LU
Q
.
“
5
00
QJ
3
GD
m
00
o
7
*
9
H
-
H
CO
Z
5
13
00
rt
-
4
*
3
o
(
HI
-
SEISMIC
)
MINIMUM
PICK
-
UP
\
l
VO
I
00
sf
n
-
5
no
UJ
Oi
>
O
”
S
13
fD
fD
QJ
O
O
C
£
0
zr
l
/
>
<
D
cz
rs
D
)
r
+
OJ
O
r
+
fD
^
5
10
00
<
-
t
-
MAXIMUM
PICK
-
UP
(
HI
-
SEISMIC
)
o
C
/
>
T
93
10
60
0
uo
50
30
80
76
20
ANGLE
IN
DEGREES
LAG
Courtesy of NationalSwitchgear.com
GEK
-
49826
RELAY
COIL
NOT
IN
CIRCUIT
RELAY
COIL
IN
CIRCUIT
5
RELAY
TERMINALS
6
RELAY
SIDE
CASE
SIDE
RELAY
SIDE
CAS
E
“
SIDE
A
5
I
2
XGAIIAI
6
—
I
2
XCAIIAI
OR
5
6
12
XCAI
IA
2
A
TEST
CONNECTIONS
FOR
TESTING
GT
SECONDARY
USED
WITH
THE
IFC
RELAY
Figure
9
(
0269
A
1787
-
1
)
Test
Connections
for
Testing
Current
Transformer
Secondary
Used
with
the
Type
HFC
Relay
19
Courtesy of NationalSwitchgear.com
GEK
-
49826
TO
START
TIMER
4
\
A
VARIABLE
RESISTOR
7
erfo
MINIMUM
RECOMMENDED
VOLTS
,
120
AT
RATED
FREQ
.
7
I
I
I
<
y
^
o
TO
STOP
TIMER
/
J
\
/
N
TO
INDICATING
I
I
-
LIGHT
WHEN
CHECKING
PICKUP
RELAY
TERMINALS
-
!
2
3
4
5
6
o
o
o
o
o
o
RELAY
SIDE
CASE
”
SIDE
RELAY
SIDE
CASE
"
'
SIDE
RELAY
SIDE
_
CASE
-
SIDE
12
XCA
11
A
1
—
^
o
o
o
o
9
e
o
5
CT
JUMPER
TEST
CONNECTIONS
FOR
TESTING
PICKUP
AND
OPERATING
TIMES
OF
THE
HFC
RELAY
INSTAN
-
TANEOUS
UNIT
WITH
ELECTRICALLY
SEPARATE
CONTACTS
.
Figure
10
(
0275
A
1904
-
0
)
Test
Connections
for
Testing
Pickup
and
Operating
Times
of
Type
HFC
Relay
Hi
-
Seismic
Instantaneous
Unit
20
Courtesy of NationalSwitchgear.com
This manual suits for next models
2
Other NATIONAL SWITCHGEAR Circuit Breaker manuals
