GE D30 Instruction Manual page 311

5 SETTINGS
I2t CURVES:
2
The curves for the I t are derived from the formulae:
T
where: T = Operate Time (sec.); TDM = Multiplier Setting; I = Input Current; I
T = Reset Time in sec. (assuming energy capacity is 100% and RESET: Timed)
RESET
2
Table 5–25: 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
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:
T TDM
=
T
RESET
where: T = Operate Time (sec.), TDM = Multiplier setting
I = Input Current, I
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.
where: T = Operate Time (sec.), TDM = Multiplier setting
I = Input Current, I
pickup
T = Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
RESET
RECLOSER CURVES:
The D30 uses the FlexCurve feature to facilitate programming of 41 recloser curves. See the FlexCurve section in this
chapter for details.
GE Multilin
100
------------------------- -
2
TDM × I T
 
,
=
--------------- -
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

× --------------- -
FlexCurve Time at

I
pickup
×
TDM FlexCurve Time at
=
= Pickup Current setting
T TDM in seconds, when I I
=
T TDM in seconds
=
RESET
= Pickup Current setting
D30 Line Distance Protection System
100
----------------------------
2
TDM × I
  –
=
--------------- -
 
I
pickup
= Pickup Current Setting;
pickup
)
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 I
  
--------------- - ≥
when 1.00
  
I
pickup
I I
   
--------------- - --------------- - ≤
when 0.98
   
I I
pickup pickup
>
pickup
5.6 GROUPED ELEMENTS
(EQ 5.10)
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
(EQ 5.11)
(EQ 5.12)
(EQ 5.13)
(EQ 5.14)
5-175
5