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