GE C70 Instruction Manual page 285
Capacitor bank protection and control system
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CHAPTER 5: SETTINGS
Multiplier
Current ( I / I
pickup
(TDM)
1.5
2.0
IAC Very Inverse
0.5
1.451
0.656
1.0
2.901
1.312
2.0
5.802
2.624
4.0
11.605
5.248
6.0
17.407
7.872
8.0
23.209
10.497
10.0
29.012
13.121
IAC Inverse
0.5
0.578
0.375
1.0
1.155
0.749
2.0
2.310
1.499
4.0
4.621
2.997
6.0
6.931
4.496
8.0
9.242
5.995
10.0
11.552
7.494
IAC Short Inverse
0.5
0.072
0.047
1.0
0.143
0.095
2.0
0.286
0.190
4.0
0.573
0.379
6.0
0.859
0.569
8.0
1.145
0.759
10.0
1.431
0.948
2
I
t curves
2
The I
t curves are derived as follows:
T
where
T = Operate time (in seconds)
TDM = Multiplier setting
I = Input current
I
= Pickup Current setting
pickup
T
= reset time in seconds (assuming energy capacity is 100% and RESET is "Timed")
RESET
2
Table 5-28: I
t curve trip times
Multiplier
Current ( I / I
(TDM)
1.5
0.01
0.44
0.10
4.44
1.00
44.44
10.00
444.44
100.00
4444.4
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
)
3.0
4.0
5.0
0.269
0.172
0.133
0.537
0.343
0.266
1.075
0.687
0.533
2.150
1.374
1.065
3.225
2.061
1.598
4.299
2.747
2.131
5.374
3.434
2.663
0.266
0.221
0.196
0.532
0.443
0.392
1.064
0.885
0.784
2.128
1.770
1.569
3.192
2.656
2.353
4.256
3.541
3.138
5.320
4.426
3.922
0.035
0.031
0.028
0.070
0.061
0.057
0.140
0.123
0.114
0.279
0.245
0.228
0.419
0.368
0.341
0.559
0.490
0.455
0.699
0.613
0.569
100
---------------------- -
2
=
TDM
×
I
,
T
------------- -
RESET
I
pickup
)
pickup
2.0
3.0
4.0
0.25
0.11
0.06
2.50
1.11
0.63
25.00
11.11
6.25
250.00
111.11
62.50
2500.0
1111.1
625.00
6.0
7.0
8.0
0.113
0.101
0.093
0.227
0.202
0.186
0.453
0.405
0.372
0.906
0.810
0.745
1.359
1.215
1.117
1.813
1.620
1.490
2.266
2.025
1.862
0.180
0.168
0.160
0.360
0.337
0.320
0.719
0.674
0.640
1.439
1.348
1.280
2.158
2.022
1.921
2.878
2.695
2.561
3.597
3.369
3.201
0.027
0.026
0.026
0.054
0.052
0.051
0.108
0.105
0.102
0.217
0.210
0.204
0.325
0.314
0.307
0.434
0.419
0.409
0.542
0.524
0.511
100
-------------------------
I
2
=
TDM
×
–
------------- -
I
pickup
5.0
6.0
7.0
0.04
0.03
0.02
0.40
0.28
0.20
4.00
2.78
2.04
40.00
27.78
20.41
400.00
277.78
204.08
GROUPED ELEMENTS
9.0
10.0
0.087
0.083
0.174
0.165
0.349
0.331
0.698
0.662
1.046
0.992
1.395
1.323
1.744
1.654
0.154
0.148
0.307
0.297
0.614
0.594
1.229
1.188
1.843
1.781
2.457
2.375
3.072
2.969
0.025
0.025
0.050
0.049
0.100
0.099
0.200
0.197
0.301
0.296
0.401
0.394
0.501
0.493
Eq. 5-10
8.0
9.0
10.0
0.02
0.01
0.01
0.16
0.12
0.10
1.56
1.23
1.00
15.63
12.35
10.00
156.25
123.46
100.00
5-161
5
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