GE L60 Instructions Manual page 455
Line phase comparison system
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CHAPTER 5: SETTINGS
Multiplier
Current ( I / I
pickup
(TDM)
1.5
2.0
1.00
3.058
1.778
IAC curves
The curves for the General Electric type IAC relay family are derived from the formulae:
where
T = operate time (in seconds)
TDM = Multiplier setting
I = Input current
I
= Pickup Current setting
pkp
A to E = constants defined in the table
t
= characteristic constant defined in the table
r
T
= reset time in seconds (assuming energy capacity is 100% and RESET is "Timed")
RESET
Table 5-32: GE type IAC inverse time curve constants
IAC curve shape
IAC Extreme Inverse
IAC Very Inverse
IAC Inverse
IAC Short Inverse
Table 5-33: GE type IAC curve trip times
Multiplier
Current ( I / I
pickup
(TDM)
1.5
2.0
IAC Extremely Inverse
0.5
1.699
0.749
1.0
3.398
1.498
2.0
6.796
2.997
4.0
13.591
5.993
6.0
20.387
8.990
8.0
27.183
11.987
10.0
33.979
14.983
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
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
)
3.0
4.0
5.0
1.113
0.877
0.752
A
B
C
0.0040
0.6379
0.6200
0.0900
0.7955
0.1000
0.2078
0.8630
0.8000
0.0428
0.0609
0.6200
)
3.0
4.0
5.0
0.303
0.178
0.123
0.606
0.356
0.246
1.212
0.711
0.491
2.423
1.422
0.983
3.635
2.133
1.474
4.846
2.844
1.966
6.058
3.555
2.457
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
6.0
7.0
8.0
0.673
0.618
0.576
D
E
1.7872
0.2461
–1.2885
7.9586
–0.4180
0.1947
–0.0010
0.0221
6.0
7.0
8.0
0.093
0.074
0.062
0.186
0.149
0.124
0.372
0.298
0.248
0.744
0.595
0.495
1.115
0.893
0.743
1.487
1.191
0.991
1.859
1.488
1.239
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
GROUPED ELEMENTS
9.0
10.0
0.544
0.518
Eq. 5-13
t
r
6.008
4.678
0.990
0.222
9.0
10.0
0.053
0.046
0.106
0.093
0.212
0.185
0.424
0.370
0.636
0.556
0.848
0.741
1.060
0.926
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
5-247
5
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