# GE UR Series Instruction Manual Page 169

Line differential relay.

5 SETTINGS
I2t CURVES:
2
The curves for the I
t are derived from the formulae:
100
×
T
=
TDM
------------------------ -
2
I
--------------- -
I
pickup
where: T = Operate Time (sec.)
TDM = Multiplier Setting
I = Input Current
I
= Pickup Current Setting
pickup
T
= Reset Time in sec. (assuming energy capacity is 100% and RESET: Timed)
RESET
2
Table 5–22: I
t CURVE TRIP TIMES
MULTIPLIER
(TDM)
1.5
0.01
0.44
0.10
4.44
1.00
44.44
10.00
444.44
100.00
4444.4
600.00
26666.7
FLEXCURVE™:
The custom FlexCurve™ is described in detail in the FLEXCURVE™ section of this chapter. The curve shapes for the Flex-
Curves™ are derived from the formulae:
×
T
TDM
FlexcurveTime@
=
×
T
=
TDM
FlexcurveTime@
RESET
where: T = Operate Time (sec.)
TDM = Multiplier Setting
I = Input Current
I
= Pickup Current Setting
pickup
T
= Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
RESET
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.
T = TDM in seconds, when I > I
T
= –TDM in seconds
RESET
where: T = Operate Time (sec.)
TDM = Multiplier Setting
I = Input Current
I
= Pickup Current Setting
pickup
T
= Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
RESET
GE Power Management
×
T
=
TDM
-------------------------- -
RESET
--------------- -
I
pickup
CURRENT ( I / I
2.0
3.0
4.0
0.25
0.11
0.06
2.50
1.11
0.63
25.00
11.11
6.25
250.00
111.11
62.50
2500.0
1111.1
625.00
15000.0
6666.7
3750.0
I
--------------- -
I
pickup
I
--------------- -
I
pickup
pickup
L90 Line Differential Relay
100
2
I
)
pickup
5.0
6.0
7.0
0.04
0.03
0.02
0.40
0.28
0.20
4.00
2.78
2.04
40.00
27.78
20.41
400.00
277.78
204.08
2400.0
1666.7
1224.5
I
When
1.00
--------------- -
I
pickup
I
When
--------------- -
I
pickup
5.5 GROUPED ELEMENTS
8.0
9.0
10.0
0.02
0.01
0.01
0.16
0.12
0.10
1.56
1.23
1.00
15.63
12.35
10.00
156.25
123.46
100.00
937.50
740.74
600.00
0.98
5-85
5 #### This manual is also suitable for:

L90 