GE D90 Plus Instruction Manual page 239
Line distance protection system
Hide thumbs
Also See for D90 Plus:
- Instruction manual (688 pages) ,
- Communications manual (222 pages) ,
- Instruction manual (602 pages)
Table of Contents
Advertisement
CHAPTER 7: PROTECTION
IAC curves
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Multiplier
Current (I / I
pickup
(TDM)
1.5
2.0
0.80
13.755 8.023
1.00
17.194 10.029 6.302
IEC curve B
0.05
1.350
0.675
0.10
2.700
1.350
0.20
5.400
2.700
0.40
10.800 5.400
0.60
16.200 8.100
0.80
21.600 10.800 5.400
1.00
27.000 13.500 6.750
IEC curve C
0.05
3.200
1.333
0.10
6.400
2.667
0.20
12.800 5.333
0.40
25.600 10.667 4.000
0.60
38.400 16.000 6.000
0.80
51.200 21.333 8.000
1.00
64.000 26.667 10.000 5.333
IEC short time
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
The curves for the General Electric type IAC relay family are derived as follows.
The terms in the above equations are defined as follows.
•
T
represents the operate time in seconds.
operate
•
TDM represents the multiplier setting.
•
I represents the input current.
•
I
represents the pickup current setting value.
pickup
•
A to E are constants and are defined in the table below.
•
T
represents reset time in seconds, assuming the energy capacity is 100% and the
reset
reset mode is timed.
•
t
represents the characteristic constant and is defined in the table below.
r
)
3.0
4.0
5.0
6.0
5.042
3.984
3.424
3.070
4.980
4.280
3.837
0.338
0.225
0.169
0.135
0.675
0.450
0.338
0.270
1.350
0.900
0.675
0.540
2.700
1.800
1.350
1.080
4.050
2.700
2.025
1.620
3.600
2.700
2.160
4.500
3.375
2.700
0.500
0.267
0.167
0.114
1.000
0.533
0.333
0.229
2.000
1.067
0.667
0.457
2.133
1.333
0.914
3.200
2.000
1.371
4.267
2.667
1.829
3.333
2.286
0.056
0.044
0.038
0.034
0.111
0.088
0.075
0.067
0.223
0.175
0.150
0.135
0.445
0.351
0.301
0.269
0.668
0.526
0.451
0.404
0.890
0.702
0.602
0.538
1.113
0.877
0.752
0.673
GROUPED PROTECTION ELEMENTS
7.0
8.0
9.0
10.0
2.822
2.637
2.493
2.376
3.528
3.297
3.116
2.971
0.113
0.096
0.084
0.075
0.225
0.193
0.169
0.150
0.450
0.386
0.338
0.300
0.900
0.771
0.675
0.600
1.350
1.157
1.013
0.900
1.800
1.543
1.350
1.200
2.250
1.929
1.688
1.500
0.083
0.063
0.050
0.040
0.167
0.127
0.100
0.081
0.333
0.254
0.200
0.162
0.667
0.508
0.400
0.323
1.000
0.762
0.600
0.485
1.333
1.016
0.800
0.646
1.667
1.270
1.000
0.808
0.031
0.029
0.027
0.026
0.062
0.058
0.054
0.052
0.124
0.115
0.109
0.104
0.247
0.231
0.218
0.207
0.371
0.346
0.327
0.311
0.494
0.461
0.435
0.415
0.618
0.576
0.544
0.518
Eq. 14
Eq. 15
229
Advertisement
Table of Contents
