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Times
the tap 0.5
1
INVERSE ANSI
1.05 8.61 17.23 34.46 51.69 68.91 86.14
1.50 2.14 4.28 8.57 12.85 17.14 21.42 25.71 29.99 34.27 38.56 42.84 51.41 59.98 68.55 77.12 85.68
2.00 0.88 1.77 3.53 5.30 7.06 8.83 10.59 12.36 14.12 15.89 17.66 21.19 24.72 28.25 31.78 35.31
3.00 0.38 0.75 1.51 2.26 3.02 3.77 4.52 5.28 6.03 6.79 7.54 9.05 10.55 12.06 13.57 15.08
4.00 0.26 0.51 1.03 1.54 2.05 2.56 3.08 3.59 4.10 4.61 5.13 6.15 7.18 8.20 9.23 10.25
5.00 0.20 0.41 0.81 1.22 1.63 2.03 2.44 2.85 3.25 3.66 4.07 4.88 5.70 6.51 7.32 8.14
6.00 0.17 0.34 0.69 1.03 1.38 1.72 2.07 2.41 2.76 3.10 3.44 4.13 4.82 5.51 6.20 6.89
7.00 0.15 0.30 0.60 0.91 1.21 1.51 1.81 2.11 2.42 2.72 3.02 3.62 4.23 4.83 5.43 6.04
8.00 0.14 0.27 0.54 0.81 1.08 1.35 1.62 1.89 2.16 2.43 2.70 3.24 3.79 4.33 4.87 5.41
9.00 0.12 0.25 0.49 0.74 0.98 1.23 1.48 1.72 1.97 2.21 2.46 2.95 3.44 3.93 4.43 4.92
10.00 0.11 0.23 0.45 0.68 0.90 1.13 1.36 1.58 1.81 2.03 2.26 2.71 3.16 3.62 4.07 4.52
VERY INVERSE ANSI
1.05 5.97 11.94 23.88 35.82 47.76 59.70 71.64 83.58 95.52
1.50 1.57 3.13 6.27 9.40 12.54 15.67 18.80 21.94 25.07 28.21 31.34 37.61 43.88 50.15 56.41 62.68
2.00 0.66 1.33 2.65 3.98 5.30 6.63 7.95 9.28 10.60 11.93 13.25 15.90 18.55 21.20 23.85 26.50
3.00 0.27 0.54 1.07 1.61 2.15 2.68 3.22 3.76 4.30 4.83 5.37 6.44 7.52 8.59 9.66 10.74
4.00 0.17 0.34 0.68 1.02 1.36 1.71 2.05 2.39 2.73 3.07 3.41 4.09 4.78 5.46 6.14 6.82
5.00 0.13 0.26 0.52 0.78 1.04 1.30 1.56 1.82 2.08 2.34 2.60 3.12 3.64 4.16 4.68 5.20
6.00 0.11 0.22 0.43 0.65 0.86 1.08 1.30 1.51 1.73 1.95 2.16 2.59 3.03 3.46 3.89 4.32
7.00 0.09 0.19 0.38 0.57 0.76 0.94 1.13 1.32 1.51 1.70 1.89 2.27 2.64 3.02 3.40 3.78
8.00 0.08 0.17 0.34 0.51 0.68 0.85 1.02 1.19 1.36 1.53 1.70 2.04 2.38 2.72 3.06 3.40
9.00 0.08 0.16 0.31 0.47 0.62 0.78 0.94 1.09 1.25 1.41 1.56 1.87 2.19 2.50 2.81 3.12
10.00 0.07 0.15 0.29 0.44 0.58 0.73 0.87 1.02 1.17 1.31 1.46 1.75 2.04 2.33 2.62 2.91
EXTREMELY INVERSE ANSI
1.05 7.37 14.75 29.49 44.24 58.98 73.73 88.48
1.50 2.00 4.00 8.00 12.00 16.00 20.00 24.01 28.01 32.01 36.01 40.01 48.01 56.01 64.01 72.02 80.02
2.00 0.87 1.74 3.49 5.23 6.98 8.72 10.47 12.21 13.95 15.70 17.44 20.93 24.42 27.91 31.40 34.89
3.00 0.33 0.66 1.32 1.98 2.64 3.30 3.96 4.62 5.28 5.93 6.59 7.91 9.23 10.55 11.87 13.19
4.00 0.18 0.37 0.74 1.10 1.47 1.84 2.21 2.58 2.94 3.31 3.68 4.42 5.15 5.89 6.62 7.36
5.00 0.12 0.25 0.49 0.74 0.99 1.24 1.48 1.73 1.98 2.23 2.47 2.97 3.46 3.96 4.45 4.95
6.00 0.09 0.19 0.37 0.56 0.74 0.93 1.11 1.30 1.48 1.67 1.85 2.23 2.60 2.97 3.34 3.71
7.00 0.07 0.15 0.30 0.45 0.60 0.75 0.89 1.04 1.19 1.34 1.49 1.79 2.09 2.38 2.68 2.98
8.00 0.06 0.13 0.25 0.38 0.50 0.63 0.75 0.88 1.01 1.13 1.26 1.51 1.76 2.01 2.26 2.51
9.00 0.05 0.11 0.22 0.33 0.44 0.55 0.66 0.77 0.88 0.99 1.10 1.32 1.54 1.76 1.97 2.19
10.00 0.05 0.10 0.20 0.29 0.39 0.49 0.59 0.69 0.79 0.88 0.98 1.18 1.38 1.57 1.77 1.96
The general equation for all ANSI curves is as follows:
Where:
GEK-106273L
ANNEX 2 TIME CURRENT CURVES FOR 51P AND 51N UNITS
TABLE A2-2. TRIP TIMES (IN SECONDS) FOR ANSI CURVES
2
3
4
5
103.3
⎡
=
+
⎢
T
M
*
A
⎣
MIF Digital Feeder Protection
Dial
6
7
8
9
120.6
137.8
155.0
172.2
7
0
3
6
107.4
119.4
6
103.2
117.9
132.7
147.4
2
7
2
B
D
+
+
−
−
2
(
V
C
)
(
V
C
)
10
12
14
16
206.7
241.2
275.6
310.1
9
4
0
6
143.2
167.1
191.0
214.9
0
8
7
5
176.9
206.4 235.9 265.4 294.9
6
5
⎤
E
⎥
−
3
⎦
(
V
C
)
18
20
344.5
2
7
238.8
3
1
12-9
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