GE NGV21A Series User manual
GEI
-
98326
VOLTAGE
RELAYS
TYPES
NGV
21
A
NGV
22
A
NGV
23
A
NGV
21
B
NGV
22
B
NGV
23
B
INTRODUCTION
This
supplement
,
together
with
instruction
book
GEI
-
90805
which
is
included
in
this
book
,
forms
the
instructions
for
the
various
models
listed
in
Table
A
.
TABLE
A
RELAY
NO
.
OF
UNITS
IN
CASE
NO
.
OF
TARGETS
TYPEOF
INTERNAL
FIGURE
CASE
NGV
21
A
NGV
21
B
NGV
22
A
NGV
22
B
NGV
23
A
NGV
23
B
0
S
2
1
3
3
2
S
2
2
2
0
S
2
3
2
2
S
2
4
1
SI
0
5
1
1
SI
6
DESCRIPTION
The
NGV
21
A
,
NGV
22
A
,
and
NGV
23
A
relays
are
similar
to
NGV
11
,
NGV
12
,
and
NGV
13
However
,
the
NGV
21
B
,
relays
in
principle
,
and
are
calibrated
in
pickup
volts
.
NGV
22
B
,
and
NGV
23
B
have
different
internal
connections
,
as
shown
in
Figures
1
thru
6
of
this
supplement
.
The
calibration
range
of
the
voltage
units
is
given
in
Table
B
.
TABLE
B
*
RATED
VOLTAGE
RANGE
OF
PICKUP
ADJUSTMENT
69
45
69
120
120
80
165
100
165
208
121
173
240
160
240
The
dropout
voltage
is
90
%
or
more
of
pickup
voltage
.
The
outline
and
panel
drilling
for
types
NGV
21
A
,
NGV
21
B
,
NGV
22
A
,
and
NGV
22
B
is
shown
in
Figure
10
of
GEI
-
90805
.
The
outline
and
panel
drilling
for
types
NGV
23
A
and
NGV
23
B
is
shown
in
Figure
11
of
GEI
-
90805
.
Revised
since
last
issue
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
provide
for
every
possible
contingency
to
be
met
in
connection
with
installation
,
operation
or
maintenance
.
Should
further
information
be
desired
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for
the
purchaser
’
s
purposes
,
the
matter
should
be
referred
to
the
General
Electric
Company
.
To
the
extent
required
the
products
described
herein
meet
applicable
ANSI
,
IEEE
and
NEMA
standards
;
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
3
Courtesy of NationalSwitchgear.com
GEI
-
90805
CONNECTING
PLUG
MAIN
BRUSH
CONNECTING
BLOCK
4
L
AUXILIARY
BRUSH
TERMINAL
BLOCK
SHORTING
BAR
-
NOTE
:
AFTER
ENGAGING
AUXILIARY
BRUSH
CONNECTING
PLUG
TRAVELS
V
4
INCH
BEFORE
ENGAGING
THE
MAIN
BRUSH
ON
THE
TERMINAL
BLOCK
Figure
1
(
8025039
)
Cross
Section
of
Drawout
Case
Showing
Position
of
Auxiliary
Brush
—
a
bfc
“
SR
CONTACTS
Snu
I
.
-
ri
FRAME
OPERATING
ARM
ARMATURE
RESIDUAL
SCREW
LOCKNUT
POLE
PIECE
m
p
l
"
'
"
u
Ei
HEELEN
D
OPERATING
ARM
STOP
COiL
Figure
2
(
8012106
)
Typical
Telephone
Type
Unit
Used
in
NGV
Relays
2
Courtesy of NationalSwitchgear.com
GEI
-
90805
UNDERVOLTAGE
RELAYS
TYPE
NGV
DESCRIPTION
The
NGV
relay
is
a
high
-
speed
relay
designed
to
be
used
wherever
undervoltage
protection
is
required
.
The
relay
is
designed
to
operate
continuously
picked
up
at
its
rated
voltage
if
required
.
Table
A
.
The
different
models
available
are
listed
in
TABLE
A
NGV
RELAY
MODELS
No
.
of
Units
in
Case
No
.
of
Targets
Type
of
Case
Relay
NGV
11
A
NGV
11
B
NGV
12
A
NGV
12
B
NGV
12
C
NGV
13
A
NGV
13
B
S
2
3
0
S
2
3
2
S
2
2
0
S
2
2
2
S
2
2
0
1
SI
0
1
1
SI
The
relay
undervoltage
element
consists
of
a
telephone
-
type
relay
in
series
with
a
zener
regulator
connected
across
a
full
wave
rectifier
.
A
capacitor
is
connected
across
the
rectifier
AC
supply
to
protect
the
rectifier
from
severe
voltage
surges
.
A
rheostat
is
connected
in
series
with
the
rectifier
to
provide
pickup
adjustment
.
Targets
mounted
in
the
drawout
case
are
available
as
indicated
in
Table
A
.
The
outline
and
drilling
dimensions
of
the
relay
are
depicted
in
Figures
10
and
11
.
APPLICATION
The
NGV
relay
is
intended
for
general
application
wherever
instantaneous
detection
of
undervoltage
is
required
.
Some
specific
applications
are
listed
below
:
Instantaneous
undervoltage
detection
for
preferred
-
emergency
throwover
control
equipment
.
1
.
Ground
fault
detection
for
faulted
-
phase
selection
on
ungrounded
systems
.
Phase
fault
detection
for
disabling
telephone
or
telemetering
services
at
stations
with
weak
backfeed
on
carrier
channels
used
for
relaying
.
2
.
3
.
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
,
IEEE
and
NEMA
standards
;
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
Should
3
Courtesy of NationalSwitchgear.com
GEI
-
90805
RATINGS
The
NGV
relay
potential
units
available
are
rated
at
69
to
240
volts
,
50
/
60
cycles
.
The
contacts
will
make
and
carry
30
amperes
for
tripping
duty
,
interrupting
capabilities
for
each
contact
for
repetitive
protective
duty
are
given
in
Table
B
.
The
The
target
units
are
current
operated
and
have
a
minimum
operating
rating
of
0.2
amperes
or
2.0
amperes
.
The
contacts
which
are
not
in
series
with
target
coils
will
carry
three
amperes
continuously
.
TABLE
B
CONTACT
INTERRUPTING
ABILITY
Interruption
Capability
(
Amps
)
Inductive
*
*
Volts
48
DC
125
DC
250
DC
115
-
60
cycles
230
-
60
cycles
1.0
0.5
0.25
0.75
0.5
*
*
Inductance
of
average
trip
coil
.
ratings
for
repetitive
protective
duty
are
approxi
-
mately
2
-
1
/
2
times
ratings
shown
in
the
table
.
The
non
-
inductive
CHARACTERISTICS
The
NGV
voltage
unit
is
a
hinged
armature
unit
which
drops
out
when
the
magnetic
pull
created
by
the
ampere
-
turns
in
the
operating
coil
is
less
than
the
force
of
the
opening
spring
.
The
drop
-
out
voltage
is
changed
by
adjusting
the
rheostat
and
the
voltage
range
is
given
in
Table
C
.
TABLE
C
VOLTAGE
RANGE
i
Rated
Volts
Range
of
Dropout
Adjustment
69
40
-
58
70
-
100
120
208
121
173
240
140
-
200
i
4
Courtesy of NationalSwitchgear.com
GEI
-
90805
The
pickup
voltage
is
110
percent
or
less
of
the
dropout
voltage
.
On
any
drop
-
out
operation
,
the
voltage
range
from
the
beginning
of
the
action
to
its
completion
is
about
one
percent
of
rated
voltage
.
The
relay
pickup
time
is
approximately
two
cycles
and
the
dropout
characteristic
(
voltage
against
time
)
is
shown
in
Figure
9
.
The
burden
of
the
voltage
unit
is
at
unity
power
factor
and
the
values
are
given
in
Table
D
.
TABLE
D
BURDENS
Rated
Voltage
Maximum
Burden
,
Watts
69
4
120
4.2
208
4.75
240
4.5
The
target
unit
coil
has
a
DC
resistance
of
7.5
ohms
for
the
0.2
ampere
unit
and
0.12
ohms
for
the
2
ampere
unit
.
Internal
connections
of
the
various
relays
are
shown
in
Figures
3
through
8
and
12
.
CONSTRUCTION
The
relay
components
are
mounted
in
a
cradle
assembly
which
is
latched
into
a
drawout
case
when
the
relay
is
in
operation
,
but
that
can
be
easily
removed
when
desired
.
To
remove
the
relay
from
its
case
,
first
disconnect
it
by
removing
the
connection
plug
that
completes
the
electrical
connections
between
the
case
block
and
the
cradle
block
.
This
connection
block
can
be
replaced
by
a
test
plug
to
test
the
relay
in
its
case
.
The
cover
,
which
is
attached
to
the
front
of
the
relay
case
,
contains
the
target
reset
mechanism
and
an
interlock
arm
which
prevents
the
cover
from
being
replaced
until
the
connection
plugs
have
been
inserted
.
The
relay
case
is
suitable
for
either
semi
-
flush
or
surface
mounting
on
all
panels
up
to
two
inches
thick
;
appropriate
hardware
is
available
,
insure
that
proper
hardware
will
be
included
,
panel
thickness
must
be
indicated
on
the
relay
order
.
For
outline
and
drilling
dimensions
,
see
Figures
10
and
11
.
Every
circuit
in
the
drawout
case
has
an
auxiliary
brush
,
as
shown
in
Figure
1
,
to
provide
adequate
overlap
when
the
connecting
plug
is
withdrawn
or
inserted
.
Some
circuits
are
equipped
with
shorting
bars
(
see
Figures
3
-
8
)
and
on
these
circuits
,
it
is
especially
important
that
the
auxiliary
brush
makes
contact
with
adequate
pressure
as
indicated
in
Figure
1
to
prevent
the
opening
of
interlock
circuits
.
However
,
to
5
Courtesy of NationalSwitchgear.com
GEI
-
90805
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
.
If
damage
resulting
from
rough
handling
is
evident
,
file
a
damage
claim
at
once
with
the
transportation
company
and
promptly
notify
the
nearest
General
Electric
Apparatus
Sales
Office
.
Use
reasonable
care
when
unpacking
the
relays
.
If
the
relays
are
not
to
be
installed
immediately
,
store
them
in
their
shipping
cartons
in
a
place
that
is
free
from
moisture
,
dust
and
metallic
chips
.
Foreign
matter
that
has
collected
on
the
outside
of
the
case
could
get
inside
when
the
cover
is
removed
and
cause
problems
in
the
operation
of
the
relay
.
Also
check
the
nameplate
stamping
to
insure
that
the
model
number
and
the
rating
of
the
relay
received
agree
with
the
requisition
,
manually
,
and
check
that
the
contact
gap
and
wipe
agree
with
values
given
in
the
section
on
ADJUSTMENTS
AND
INSPECTION
.
Check
the
operation
ADJUSTMENT
AND
INSPECTION
MECHANICAL
CHECK
Check
the
relay
for
mechanical
operation
before
installation
to
see
that
it
operates
smoothly
and
that
the
contacts
are
correctly
adjusted
.
With
the
relay
de
-
energized
,
each
normally
open
contact
should
have
a
gap
of
0.015
inch
or
more
.
Observe
the
wipe
on
each
normally
closed
contact
by
deflecting
the
stationary
contact
member
towards
the
frame
.
Wipe
should
be
approximately
0.005
inch
.
The
wipe
on
each
normally
open
contact
should
be
approximately
0.005
inch
.
Check
by
inserting
a
0.005
inch
shim
between
the
residual
screw
and
the
pole
piece
and
operating
the
armature
by
hand
.
The
normally
open
contacts
should
make
before
the
residual
screw
strikes
the
shim
.
ELECTRICAL
TEST
The
relay
should
be
tested
before
installation
and
periodically
thereafter
by
connecting
a
variable
source
of
voltage
at
rated
frequency
to
the
coil
studs
and
checking
the
pickup
and
dropout
voltages
.
Use
the
variable
rheostat
to
the
relay
,
and
if
necessary
,
the
residual
screw
to
adjust
to
the
values
required
.
Adjustment
of
the
ratio
of
pickup
to
dropout
is
made
,
if
necessary
,
with
the
residual
screw
;
in
most
applications
no
adjustment
of
this
ratio
will
be
required
.
A
variable
source
of
DC
power
should
be
connected
to
the
target
circuits
,
if
furnished
,
and
the
pickup
amperes
checked
.
6
Courtesy of NationalSwitchgear.com
GE
I
—
90805
SERVICING
In
view
of
the
vital
role
of
protective
relays
in
the
operation
of
a
power
system
it
is
important
to
follow
a
periodic
test
program
.
The
interval
between
periodic
checks
will
probably
vary
depending
upon
environment
,
the
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
individual
requirements
,
the
points
listed
under
ADJUSTMENT
AND
INSPECTION
should
be
checked
once
a
year
.
A
flexible
burnishing
tool
should
be
used
to
clean
fine
silver
contacts
.
This
tool
is
an
etched
-
roughened
strip
of
flexible
metal
,
resembling
in
effect
a
superfine
file
,
that
will
remove
corroded
material
quickly
and
thoroughly
without
scratching
the
surface
.
The
flexibility
of
the
tool
insures
the
cleaning
of
the
actual
points
of
contact
.
Knives
,
files
,
abrasive
paper
or
cloth
should
never
be
used
to
clean
fine
silver
contacts
.
The
burnishing
tool
described
above
can
be
obtained
from
the
factory
.
RENEWAL
PARTS
Sufficient
quantities
of
renewal
parts
should
be
carried
in
stock
for
prompt
replacement
of
any
parts
that
become
worn
,
broken
,
or
damaged
.
When
ordering
renewal
parts
,
address
the
nearest
Sales
Office
of
the
General
Electric
Company
,
specify
quantity
required
,
name
of
the
part
wanted
,
and
give
complete
nameplate
data
.
If
possible
,
give
the
General
Electric
requisition
number
on
which
the
relay
was
furnished
.
u
13
15
1
?
39
o
O
Q
O
14
16
18
20
A
A
A
A
A
A
AAA
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w
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-
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1
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1
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o
o
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u
2
6
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8
10
Figure
3
(
0195
A
4938
-
0
)
Internal
Connections
Diagram
for
the
NGV
11
A
Relay
(
Front
View
)
7
Courtesy of NationalSwitchgear.com
GE
1
-
90805
n
13
15
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?
19
o
r
-
9
„
Q
12
14
16
IB
c
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h
-
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MIDDLE
H
r
T
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VV
V
\
V
/
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/
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v
o
1
3
5
7
9
o
o
2
6
4
8
10
Figure
4
(
0195
A
4939
-
2
)
Internal
Connections
Diagram
for
the
NGV
11
B
Relay
(
Front
View
)
19
n
13
15
o
O
O
Q
20
12
U
16
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3
5
9
6
o
c
1
C
2
6
4
Figure
5
(
0178
A
9182
-
1
)
Internal
Connections
Diagram
for
the
NGV
12
A
Relay
(
Front
View
)
8
Courtesy of NationalSwitchgear.com
GEI
-
90805
l
*
13
If
,
U
C
20
16
1
1
1
o
A
i
r
t
J
*
A
IT
TR
\
J
LETT
I
L
RIGHT
o
LTI
'
f
X
'
v
V
V
v
1
3
5
6
c
o
C
ic
2
Figure
6
(
0195
A
4956
-
1
)
Internal
Connections
Diagram
for
the
NGV
12
B
Relay
(
Front
View
)
a
WHEN
USED
Cl
^
WHEN
USED
)
\
\
1
/
*
\
J
/
*
>
J
/
V
~
v
VV
V
“
V
1
5
7
9
O
O
o
o
o
2
4
6
8
10
*
=
SHORT
FINGER
Figure
7
(
0195
A
4940
-
4
)
Internal
Connections
Diagram
for
the
NGV
13
A
Relay
(
Front
View
)
9
Courtesy of NationalSwitchgear.com
GEI
-
90805
T
<
r
*
\
n
t
\
\
K
*
V
*
V
v
v
Y
v
V
-
*
-
V
*
V
Y
"
"
V
V
V
6
6
6
o
o
1
b
7
9
o
o
o
o
o
2
10
6
8
4
SHORT
FINGER
*
=
Figure
8
(
0195
A
4941
-
0
)
Internal
Connections
Diagram
for
the
NGV
13
B
Relay
(
Front
View
)
LINKS
SHOWN
WITH
TARGET
IN
CIRCUIT
1
-
2
A
.
-
—
*
e
lO
>
vQ
;
O
'
-
E
”
F
T
*
1
—
1
±
1
V
V
V
*
V
*
V
V
V
*
\
J
/
*
V
v
V
V
v
3
6
5
7
6
9
o
o
o
2
4
6
8
10
OTHER
LINK
POSITIONS
A
_
B
,
C
'
.
o
)
°
c
:
or
A
/
^
B
'
Q
'
.
SO
'
c
WITH
TARGET
Q
\
C
;
£
vO
.
1
1
,
0
J
NO
TARGET
IN
CIRCUIT
IN
CIRCUIT
3
“
4
(
FRONT
VIEW
)
*
=
SHORT
FINGERS
Figure
8
A
(
0275
A
4380
-
1
)
Internal
Connections
Diagram
for
the
NGV
13
B
-
Revision
A
Relay
(
Front
View
)
10
Courtesy of NationalSwitchgear.com
GEI
—
90805
PANEL
LOCATION
SEMI
-
FLUSH
,
MTG
.
(
2
)
5
/
16
-
18
STUDS
FDR
SURFACE
MTG
.
SURFACE
MTG
.
i
10
-
32
STUDS
,
6.625
168
MM
it
Q
19
17
15
13
11
o
o
o
o
o
o
o
o o
o
2018
16
14
12
9.875
250
MM
10.312
26
1
MM
(
4
)
10
-
32
X
3
/
8
MTG
.
SCREWS
STUD
NUMBERING
9
7
5
3
1
O
O
O
O
O
o o o
o
o
108642
T
0
-
32
STUDS
GLASS
_
i
1.125
29
MM
.
75
BACK
VIEW
CUTDUTS
MAY
REPLACE
IT
-
DRILLED
HOLES
1
9
MM
1
/
4
DRILL
4
HDLES
3
.
0
6.187
157
MM
76
MM
6
MM
f
I
AAo
%
4
,
875
123
MM
o
1
o
5
,
000
127
MM
5
/
8
DRILL
2
HDLES
15
MM
—
2.781
7
1
MM
J
1
.
75
46
MM
1
<
L
i
i
3.50
88
MM
%
I
1
9.75
247
MM
5
562
1
42
MM
CUThUT
~
1
10.000
254
MM
I
4.50
I
1
14
MM
f
,
I
i
o
o
1
,
468
37
MM
J
f
.
718
18
MM
.
250
'
2.843
'
72
MM
6
MM
.
218
.
218
-
.
500
12
MM
(
TYPICAL
)
5
MM
5.25
5
MM
i
i
5.687
133
MM
PANEL
144
MM
3
/
4
DRILL
20
HDLES
19
MM
11
PANEL
DRILLING
FDR
SURFACE
MOUNTING
FRDNT
VIEW
PANEL
DRILLING
FDR
SEMI
-
FLUSH
MOUNTING
FRDNT
VIEW
MB
CA
5
/
16
-
18
STUD
i
_
'
3.0
m
j
76
MM
VIEW
SHEWING
ASSEMBLY
FDR
SURFACE
MTG
.
DN
STEEL
PANELS
TYPICAL
DIM
.
INCHES
n
HARDWARE
LJ
r
MM
Figure
10
(
K
-
6209272
[
7
]
)
Outline
and
Panel
Drilling
Dimensions
for
Drawout
Relays
-
Size
S
2
Case
12
Courtesy of NationalSwitchgear.com
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