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CHAPTER 4: SETPOINTS
2
Table 4-42: I
T CURVE TRIP TIMES (IN SECONDS)
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
4444.44
600.00
26666.7
4
Table 4-43: I
T CURVE TRIP TIMES (IN SECONDS)
MULTIPLIER
CURRENT (I/I
(TDM)
1.5
0.01
0.1975
0.10
1.9753
1.00
19.753
10.00
197.531
100.00
1975.31
600.00
11851.9
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
2
I
T CURVES
2
The curves for the I
t are derived from the formula:
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 is
RESET
"Timed")
)
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
2500.00
1111.1
625.00
15000.0
6666.7
3750.0
4
I
T CURVES
4
The curves for the I
t are derived from the formula:
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 is
RESET
"Timed")
)
pickup
2.0
3.0
4.0
0.0625
0.0123
0.0039
0.6250
0.1235
0.0391
6.250
1.235
0.391
62.500
12.346
3.906
625.00
123.46
39.06
3750.0
740.7
234.4
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
5.0
6.0
7.0
0.0016
0.0008
0.0004
0.0160
0.0077
0.0042
0.160
0.077
0.042
1.600
0.772
0.416
16.00
7.72
4.16
96.00
46.3
25.0
PROTECTION
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
123.5
10.00
156.25
123.46
100.00
937.50
740.74
600.00
8.0
9.0
10.0
0.0002
0.00015
0.0001
0.0024
0.0015
0.0010
0.024
0.015
0.010
0.244
0.152
0.100
2.44
1.52
1.00
14.65
9.14
6.00
4–121
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