GE Multilin
L30 Line Current Differential System
5-149
5 SETTINGS
5.6 GROUPED ELEMENTS
5
I2t CURVES:
The curves for the I
2
t are derived from the formulae:
,
(EQ 5.13)
where:
T
= Operate Time (sec.); TDM = Multiplier Setting;
I
= Input Current;
I
pickup
= Pickup Current Setting;
T
RESET
= Reset Time in sec. (assuming energy capacity is 100% and RESET: Timed)
FLEXCURVES™:
The custom FlexCurves are described in detail in the FlexCurves section of this chapter. The curve shapes for the Flex-
Curves are derived from the formulae:
(EQ 5.14)
(EQ 5.15)
where:
T
= Operate Time (sec.), TDM = Multiplier setting
I
= Input Current,
I
pickup
= Pickup Current setting
T
RESET
= Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
DEFINITE TIME CURVE:
The Definite Time curve shape operates as soon as the pickup level is exceeded for a specified period of time. The base
definite time curve delay is in seconds. The curve multiplier of 0.00 to 600.00 makes this delay adjustable from instanta-
neous to 600.00 seconds in steps of 10 ms.
(EQ 5.16)
(EQ 5.17)
where:
T
= Operate Time (sec.), TDM = Multiplier setting
I
= Input Current,
I
pickup
= Pickup Current setting
T
RESET
= Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
RECLOSER CURVES:
The L30 uses the FlexCurve feature to facilitate programming of 41 recloser curves. Please refer to the FlexCurve section
in this chapter for additional details.
Table 5–21: I
2
T CURVE TRIP TIMES
MULTIPLIER
(TDM)
CURRENT (
I
/
I
pickup
)
1.5
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
0.01
0.44
0.25
0.11
0.06
0.04
0.03
0.02
0.02
0.01
0.01
0.10
4.44
2.50
1.11
0.63
0.40
0.28
0.20
0.16
0.12
0.10
1.00
44.44
25.00
11.11
6.25
4.00
2.78
2.04
1.56
1.23
1.00
10.00
444.44
250.00
111.11
62.50
40.00
27.78
20.41
15.63
12.35
10.00
100.00
4444.4
2500.0
1111.1
625.00
400.00
277.78
204.08
156.25
123.46
100.00
600.00
26666.7
15000.0
6666.7
3750.0
2400.0
1666.7
1224.5
937.50
740.74
600.00
T
TDM
100
I
I
pickup
----------------
2
--------------------------
=
T
RESET
TDM
100
I
I
pickup
----------------
2
–
----------------------------
=
T
TDM
FlexCurve Time at
I
I
pickup
----------------
=
when
I
I
pickup
----------------
1.00
T
RESET
TDM
FlexCurve Time at
I
I
pickup
----------------
when
I
I
pickup
----------------
0.98
=
T
TDM in seconds, when
I I
pickup
=
T
RESET
TDM in seconds
=
Summary of Contents for L30
Page 10: ...x L30 Line Current Differential System GE Multilin TABLE OF CONTENTS ...
Page 30: ...1 20 L30 Line Current Differential System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 370: ...5 244 L30 Line Current Differential System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 464: ...A 10 L30 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 600: ...C 30 L30 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 610: ...D 10 L30 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 622: ...E 12 L30 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 634: ...F 12 L30 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Page 644: ...x L30 Line Current Differential System GE Multilin INDEX ...
