GE MI-869 - Page 297

CHAPTER 4: SETPOINTS PROTECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–179
T
RESET
= reset time in seconds (assuming energy capacity is 100% and RESET is
“Timed”)
Table 4-29: I
4
T CURVE TRIP TIMES (IN SECONDS)
FLEXCURVES
The custom FlexCurves are described in detail in the FlexCurves section of this chapter. The
cur
ve shapes for the FlexCurves are derived from the formulae:
Where:
T = operate time (in seconds),
TDM =
Multiplier setting,
I = input current,
I
pickup
= Pickup Current setting,
T
RESET
= reset time in seconds (assuming energy capacity is 100% and RESET is
“Timed”)
DEFINITE TIME CURVES
The Definite Time curve shape operates as soon as the Pickup level is exceeded for a
specif
ied period of time. The base Definite Time curve delay is in seconds. The curve
multiplier of 0.05 to 600 makes this delay adjustable from 50 to 600000 milliseconds.
Where:
T = operate time (in seconds)
TDM =
Multiplier setting
I = input current
I
pickup
= Pickup Current setting
T
RESET
= reset time in seconds (assuming energy capacity is 100% and RESET is
“Timed”)
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 0.1975 0.0625 0.0123 0.0039 0.0016 0.0008 0.0004 0.0002 0.00015 0.0001
0.10 1.9753 0.6250 0.1235 0.0391 0.0160 0.0077 0.0042 0.0024 0.0015 0.0010
1.00 19.753 6.250 1.235 0.391 0.160 0.077 0.042 0.024 0.015 0.010
10.00 197.531 62.500 12.346 3.906 1.600 0.772 0.416 0.244 0.152 0.100
100.00 1975.31 625.00 123.46 39.06 16.00 7.72 4.16 2.44 1.52 1.00
600.00 11851.9 3750.0 740.7 234.4 96.00 46.3 25.0 14.65 9.14 6.00