GE D30 Instruction Manual page 320
Line distance protection system
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GROUPED ELEMENTS
Multiplier
Current ( I / I
(TDM)
1.5
IAC Short Inverse
0.5
0.072
1.0
0.143
2.0
0.286
4.0
0.573
6.0
0.859
8.0
1.145
10.0
1.431
2
I
t curves
2
The I
t curves are derived as follows:
where
T = Operate time (in seconds)
TDM = Multiplier setting
I = Input current
I
= Pickup Current setting
5
pickup
T
= reset time in seconds (assuming energy capacity is 100% and RESET is "Timed")
RESET
2
Table 5-27: I
t curve trip times
Multiplier
(TDM)
0.01
0.10
1.00
10.00
100.00
600.00
FlexCurves
FlexCurves are described in the FlexCurves section later in this chapter. The curve shapes for the FlexCurves are derived
from the formulae:
where
T = operate time (in seconds)
TDM = Multiplier setting
I = Input Current
I
= Pickup Current setting
pickup
T
= Reset Time in seconds (assuming energy capacity is 100% and
RESET
5-188
)
pickup
2.0
3.0
4.0
0.047
0.035
0.031
0.095
0.070
0.061
0.190
0.140
0.123
0.379
0.279
0.245
0.569
0.419
0.368
0.759
0.559
0.490
0.948
0.699
0.613
100
---------------------- -
×
I
T
=
TDM
------------- -
I
pickup
Current ( I / I
)
pickup
1.5
2.0
3.0
0.44
0.25
0.11
4.44
2.50
1.11
44.44
25.00
11.11
444.44
250.00
111.11
4444.4
2500.0
1111.1
26666.7
15000.0
6666.7
T
=
TDM
×
FlexCurve Time at
T
=
TDM
×
FlexCurve Time at
RESET
5.0
6.0
7.0
0.028
0.027
0.026
0.057
0.054
0.052
0.114
0.108
0.105
0.228
0.217
0.210
0.341
0.325
0.314
0.455
0.434
0.419
0.569
0.542
0.524
100
-------------------------
2
,
×
I
T
=
TDM
------------- -
RESET
I
pickup
4.0
5.0
6.0
0.06
0.04
0.03
0.63
0.40
0.28
6.25
4.00
2.78
62.50
40.00
27.78
625.00
400.00
277.78
3750.0
2400.0
1666.7
I
I
------------- -
------------- -
when
I
I
pickup
pickup
I
------------- -
------------- -
when
I
I
pickup
pickup
: Timed)
RESET
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
8.0
9.0
0.026
0.025
0.051
0.050
0.102
0.100
0.204
0.200
0.307
0.301
0.409
0.401
0.511
0.501
2
–
7.0
8.0
9.0
0.02
0.02
0.01
0.20
0.16
0.12
2.04
1.56
1.23
20.41
15.63
12.35
204.08
156.25
123.46
1224.5
937.50
740.74
≥
1.00
I
≤
0.98
10.0
0.025
0.049
0.099
0.197
0.296
0.394
0.493
Eq. 5-10
10.0
0.01
0.10
1.00
10.00
100.00
600.00
Eq. 5-11
Eq. 5-12
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