GE D90 Plus Instruction Manual page 244

GROUPED PROTECTION ELEMENTS
234
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
I t curves
2
The I t curves are derived as follows:
where
• T = operate time in seconds
operate
• TDM = multiplier setting
• I = input current
• I = pickup current setting
pickup
• T = 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. 16
Eq. 17
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