GE B30 Instruction Manual page 405
Bus differential system
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Also See for B30:
- Instruction manual (626 pages) ,
- Communications manual (532 pages) ,
- Technical reference manual (252 pages)
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CHAPTER 5: SETTINGS
Multiplier
Current ( I / I
pickup
(TDM)
1.5
2.0
0.10
6.400
2.667
0.20
12.800
5.333
0.40
25.600
10.667
0.60
38.400
16.000
0.80
51.200
21.333
1.00
64.000
26.667
IEC Short Inverse
0.05
0.153
0.089
0.10
0.306
0.178
0.20
0.612
0.356
0.40
1.223
0.711
0.60
1.835
1.067
0.80
2.446
1.423
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 5-29: GE type IAC inverse time curve constants
IAC curve shape
IAC Extreme Inverse
IAC Very Inverse
IAC Inverse
IAC Short Inverse
Table 5-30: 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
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
)
3.0
4.0
5.0
1.000
0.533
0.333
2.000
1.067
0.667
4.000
2.133
1.333
6.000
3.200
2.000
8.000
4.267
2.667
10.000
5.333
3.333
0.056
0.044
0.038
0.111
0.088
0.075
0.223
0.175
0.150
0.445
0.351
0.301
0.668
0.526
0.451
0.890
0.702
0.602
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
6.0
7.0
8.0
0.229
0.167
0.127
0.457
0.333
0.254
0.914
0.667
0.508
1.371
1.000
0.762
1.829
1.333
1.016
2.286
1.667
1.270
0.034
0.031
0.029
0.067
0.062
0.058
0.135
0.124
0.115
0.269
0.247
0.231
0.404
0.371
0.346
0.538
0.494
0.461
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
GROUPED ELEMENTS
9.0
10.0
0.100
0.081
0.200
0.162
0.400
0.323
0.600
0.485
0.800
0.646
1.000
0.808
0.027
0.026
0.054
0.052
0.109
0.104
0.218
0.207
0.327
0.311
0.435
0.415
0.544
0.518
Eq. 5-7
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
5-197
5
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