GE M60 Instruction Manual page 339
Motor protection system
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CHAPTER 5: SETTINGS
2
I
t curves
2
The curves for the I
t are derived from the formulae:
T
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 5-32: I
t curve trip times
Multiplier
Current ( I / I
(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
FlexCurves are derived from the formulae:
T
=
T
RESET
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.
where
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
100
---------------------- -
I
2
=
TDM
,
T
------------- -
RESET
I
pickup
)
pickup
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
------------- -
TDM
FlexCurve Time at
I
pickup
=
TDM
FlexCurve Time at
T
=
TDM in seconds, when I I
T
=
TDM in seconds
RESET
100
-------------------------
2
=
TDM
I
–
------------- -
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
I
------------- -
when
1.00
I
pickup
I
I
------------- -
------------- -
when
0.98
I
I
pickup
pickup
: Timed)
RESET
>
pickup
GROUPED ELEMENTS
Eq. 5-34
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. 5-35
Eq. 5-36
Eq. 5-37
Eq. 5-38
5-211
5
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