GE D90 Plus Instruction Manual page 200

GROUPED PROTECTION ELEMENTS
2
I t curves
192
Multiplier Current (I / I
pickup
(TDM)
1.5 2.0
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
The I t curves 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
• T represents reset time in seconds, assuming the energy capacity is 100% and the
reset
reset mode is timed.
2
Table 12: I t curve trip times (in seconds)
Multiplier Current (I / I
pickup
(TDM)
1.5 2.0
0.01 0.44 0.25
0.10 4.44 2.50
1.00 44.44 25.00
10.00 444.44 250.00 111.11 62.50
100.00 4444.4 2500.0 1111.1 625.00 400.00 277.78 204.08 156.25 123.46 100.00
600.00 26666. 15000.
7 0
)
3.0 4.0 5.0 6.0
1.064 0.885 0.784 0.719
2.128 1.770 1.569 1.439
3.192 2.656 2.353 2.158
4.256 3.541 3.138 2.878
5.320 4.426 3.922 3.597
0.035 0.031 0.028 0.027
0.070 0.061 0.057 0.054
0.140 0.123 0.114 0.108
0.279 0.245 0.228 0.217
0.419 0.368 0.341 0.325
0.559 0.490 0.455 0.434
0.699 0.613 0.569 0.542
)
3.0 4.0 5.0 6.0
0.11 0.06 0.04 0.03
1.11 0.63 0.40 0.28
11.11 6.25 4.00 2.78
40.00 27.78
6666.7 3750.0 2400.0 1666.7 1224.5 937.50 740.74 600.00
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
7.0 8.0 9.0 10.0
0.674 0.640 0.614 0.594
1.348 1.280 1.229 1.188
2.022 1.921 1.843 1.781
2.695 2.561 2.457 2.375
3.369 3.201 3.072 2.969
0.026 0.026 0.025 0.025
0.052 0.051 0.050 0.049
0.105 0.102 0.100 0.099
0.210 0.204 0.200 0.197
0.314 0.307 0.301 0.296
0.419 0.409 0.401 0.394
0.524 0.511 0.501 0.493
Eq. 14
Eq. 15
7.0 8.0 9.0 10.0
0.02 0.02 0.01 0.01
0.20 0.16 0.12 0.10
2.04 1.56 1.23 1.00
20.41 15.63 12.35 10.00