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GEK-34053
BURDENS
Burdens for the time—overcurrent unit are given in Table VIII.
TABLE VIII
RANGE
HZ
MIN.
BURDENS AT MIN.
BURDENS IN
V.A. AT 5 AMPS
TAP
PICKUP MIN. TAP
OHMS (1)
CALCULATED FROM
IMPEDANCE AT MIN.
PICKUP (121)
R
Z
3
10
20.0
TIMES TIMES TIMES
PICK- PICK- PICK
UP
UP
UP
0.5
-
0.4
60
0.5
5.60
21.0
22.0
10.80 5.00 3.66
550.0
2.0
-
15.0
60
2.0
0.37
1.44
1.45
0.65 0.32 0.24
36.3
NOTE:
The
impedance
values
given
are
those
for
the
minimum
tap
of
each
relay.
The
impedance
for
other
taps
at
pick
up
current
(tap
rating)
varies
inversely
(approximately)
as
the
square
of
the
tap
rating.
For
examp1e
for
a
relay
with
0.5-4.0
amp
range,
the
impedance
of
the
0.5
amp
tap
is given as
22.0
ohms.
The
impedance of
the
2.0
amp
tap
at 2.0 amperes is (.5/2)2 x 22
=
1.37 ohm.
The instantaneous unit burdens are listed in Table IX.
TABLE IX
BURDENS AT
MIN.
BURDENS IN
RANGE
tCON-
MIN.
PICKUP MIN. TAP
OHMS (1)
60
HZ
NEC-
TAP
RELAYS
TIONS
AMPS
R
Z
3
10
20.0
V.A. AT 5 AMPS
ONLY
OHMS OHMS
OHMS
TIMES TIMES TIMES
CALCULATED FROM
(AMPS)
PICK
PICK
PICK
IMPEDANCE AT MIN.
UP
UP
UP
PICKUP (12Z)
O 5—4 0
LOW
0.5
12.7
11.5
17.1
9.6
8.7
8.2
427.5
HIGH
1.0
3.18
2.87
4.28
2.40
2.18
2.04
107.0
2 0-16 0
LOW
2.0
0.76
0.72
1.05
0.59
0.53
0.50
26.25
HIGH
4.0
0.189 0.180
0.261
0.147 0.133 0.125
6.63
10 0-80 0
LOW
10.0
0.042 0.029
0.051
0.029 0.026 0.024
1.28
HIGH
20.0
0.010 0.007
0.013
0.007 0.007 0.006
0.33
20.0-160.0
LOW
20.0
0.015 0.008
0.017
0.010 0.009 0.008
0.43
HIGH
40.0
0.004 0.002
0.004
0.002 0.002 0.002
0.10
j- Low means two windings connected in series.
High means two windings connected in parallel.
See Internal-Connections diagram for additional information.
8
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