GE c60 Instruction Manual page 310

GROUPED ELEMENTS
Multiplier Current ( I / I
(TDM)
1.5
10.0 1.431
2
I t curves
The curves for the I
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: Timed)
RESET
2
Table 5-33: I t curve trip times
Multiplier
(TDM)
0.01
0.10
5
1.00
10.00
100.00
600.00
FlexCurves
The custom FlexCurves are described in detail in the FlexCurves section of 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
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
instantaneous to 600.00 seconds in steps of 10 ms.
5-184
)
pickup
2.0 3.0 4.0
0.948 0.699 0.613
2
t are derived from the formulae:
100
---------------------- -

T = TDM I

------------- -

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
T = TDM in seconds, when I I
T
RESET
5.0 6.0 7.0
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
>
pickup
= TDM in seconds
C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
8.0 9.0
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
0.493
Eq. 5-11
10.0
0.01
0.10
1.00
10.00
100.00
600.00
Eq. 5-12
Eq. 5-13
Eq. 5-14
Eq. 5-15