ABB 511 Series - Page 17

IB
-
7.2
.
1.7
-
1
PAGE
17
SOLID
-
STATE
OVERCURRENT
RELAYS
6.230
208.53
r
CIRCUIT
-
SHIELD
|
OVERCURRENT
RELAY
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6.362
164.66
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Suggested
arrangement
for
drawout
type
test
facilities
to
be
used
by
those
wishing
to
maintain their
conventional
test
procedures
when
checking
solid
-
state
overcurrent
relays
.
®
0
*
0
L
^
87
J
1
I
-
1
8
TU
0
NUMWC
88
(
RACK
view
)
60.88
4.623
<
46.28
This sketch shows
Westinghouse
’
s
Flexitest
Switch
.
However
,
G
.
E
.
,
States
,
Meter Devices
,
or
other
types
can
be
used
.
Fig
.
3
—
Typical
Test
Switch
Connections
OMHCNSION
3
ARC
-
JjSP
Fig
.
2
—
Overcurrent
Relay
Outline
and
Drilling
Use
the
following
conversion table
to
convert
60
Hz
curves
to
50
Hz
operation
.
This conversion
applies
only
to
relays
rated
50
/
60
Hz
.
FREQUENCY
RATING
Type
51
series
relays
with
a
nameplate
rating
of
50
/
60
Hz
are
suitable
for
operation
at
either
frequency
;
how
-
ever
,
the time
current
curves
shown
on
pages
7
-
16
apply only
to
60
Hz
operation
.
To determine
the
operat
-
ing
time
for
50
Hz
applications
use
the correction
factors
shown
here
.
60
HZ
MULTIPLE
50
HZ
MULTIPLE
1
1
2
2
3
3.18
4
4.38
Type
511
inverse
relays
with
a
nameplate
rating
of
50
Hz
(
only
)
will
perform
per
curve
TCC
605801
when
op
-
erated
at
50
Hz
.
The correction
factors
should
NOT
be
used
.
5
5.58
6
6.78
8
9.18
10
11.58
17.58
23.58
48.42
15
20
40
Plot
the
time
corresponding
to
a
multiple
of
current
in
the
60
Hz
column
against
the
multiple
in
the
50
Hz
column
.
EXAMPLE
:
Find
the time
corresponding
to
4
multiples
of
current
on
the
60
Hz
curve
in
the
instruction
book
.
Plot this
value
of
time
for
4.38
multiples
of
current
for
50
Hz
.
Courtesy of NationalSwitchgear.com