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TYPE
RANGES
OF
AVAILABLE
TAP
IIT
WITH CORE
SETTING
UNIT
ADJUSTMENT
2-7
2-7
2-48
7-14
7-14
14-48
14-48
6-20
6-20
6-144
20-40
20-40
40-144
40-144
NOTE 1. 50 Hz values for Z and OHMS are 96% to 100% of 60 Hz Values.
AMPERE
CONTINUOUS ONE SECOND POWER
RANGE
TAP
RATING
(AMPERES)
0.5
0.91
0.6
0.96
0.8
1.18
0.5/2.5
1.0
1.37
1.5
1.95
2.0
2.24
2.5
2.50
1.0
1.65
1.2
1.90
1.5
2.20
2.0
3.30
2.5
4.00
3.0
5.00
3.5
5.50
1/12
4.0
6.50
5.0
7.10
6.0
8.80
7.0
9.50
8.0
10.50
10.0
12.00
12.0
13.00
T
hermal capacities for short times other than one second may be calculated on the basis of times being inversely proportional to the
square of the current
ø
Degrees current lags voltage at tap value current
** Voltages taken with Rector type voltmeter
Courtesy of NationalSwitchgear.com
ENERGY REQUIREMENTS
INSTANTANEOUS TRIP UN IT(IIT)
60 HERTZ BURDEN (NOTE 1 FOR 50 HZ)
AT PICKUP
MINIUM
PICKUP
R
XL
Z
2
.68
.42
.8
7
.076
.048
.09
14
.032
.012
.035
6
108
.067
.127
20
.016
.008
.018
40
.007
.002
.007
CO-2 SHORT TIME RELAY
TAP VALUE
RATING
FACTOR
CURRENT
ø
(AMPERES)
ANGLE
28
58
28
57
28
53
28
50
28
40
28
36
28
29
28
55
28
54
28
53
28
54
56
56
56
55
56
54
56
53
230
53
230
50
230
48
230
46
230
40
230
35
OHMS
3
10
TIMES
TIMES
TIMES
PICKUP
PICKUP
PICKUP
.72
.67
.086
.075
.035
.035
.125
.125
.018
.018
.007
.007
60 HERTZ VOLT AMPERES**(x
AT
AT 3 TIMES
TAP VALUE
CURRENT
∆
∆
(
= 0.86)
(
= 0.88)
4.8
39.6
4.9
39.8
5.0
42.7
5.3
45.4
6.2
54.4
7.2
65.4
7.9
73.6
4.6
37.3
4.6
38.0
4.8
40.0
4.8
40.5
4.7
39.2
4.9
40.2
4.9
41.0
4.8
41.0
5.1
42.7
5.2
44.0
5.7
48.5
6.2
53.0
6.8
61.0
7.8
0
I.L. 41-100J
CONT.
1 SECO ND
20
RATING
RATING
AMPS
AMPS
.67
2.5
70
.075
7
140
.035
10
185
.100
7
88
.018
16
280
.007
25
460
∆
FOR 50 HZ)
AT 10 TIMES AT 20 TIMES
TAP VALUE
TAP VALUE
CURRENT
CURRENT
∆
∆
(
= 0.9)
(
= 0.91)
256
790
270
851
308
1024
348
1220
435
1740
580
2280
700
285
266
895
280
1000
310
1150
315
1180
282
970
295
1050
312
1125
325
1150
330
1200
360
1350
390
1600
475
1800
565
2500
680
3300
9
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