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Times
the tap 0.05 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.20 1.40 1.60 1.80 2.00
INVERSE BS 142
1.05 7.17 14.34 28.68 43.02 57.36 71.70 86.04
1.50 0.86 1.72 3.44 5.16 6.88 8.60 10.32 12.04 13.76 15.47 17.19 20.63 24.07 27.51 30.95 34.39
2.00 0.50 1.00 2.01 3.01 4.01 5.01 6.02 7.02 8.02 9.03 10.03 12.03 14.04 16.05 18.05 20.06
3.00 0.32 0.63 1.26 1.89 2.52 3.15 3.78 4.41 5.04 5.67 6.30 7.56 8.82 10.08 11.34 12.60
4.00 0.25 0.50 1.00 1.49 1.99 2.49 2.99 3.49 3.98 4.48 4.98 5.98 6.97 7.97 8.96 9.96
5.00 0.21 0.43 0.86 1.28 1.71 2.14 2.57 3.00 3.42 3.85 4.28 5.14 5.99 6.85 7.70 8.56
6.00 0.19 0.38 0.77 1.15 1.53 1.92 2.30 2.69 3.07 3.45 3.84 4.60 5.37 6.14 6.91 7.67
7.00 0.18 0.35 0.71 1.06 1.41 1.76 2.12 2.47 2.82 3.17 3.53 4.23 4.94 5.64 6.35 7.06
8.00 0.16 0.33 0.66 0.99 1.32 1.65 1.98 2.31 2.64 2.97 3.30 3.96 4.62 5.27 5.93 6.59
9.00 0.16 0.31 0.62 0.93 1.25 1.56 1.87 2.18 2.49 2.80 3.12 3.74 4.36 4.99 5.61 6.23
10.00 0.15 0.30 0.59 0.89 1.19 1.49 1.78 2.08 2.38 2.67 2.97 3.56 4.16 4.75 5.35 5.94
VERY INVERSE BS 142
1.05 13.50 27.00 54.00 81.00
1.50 1.35 2.70 5.40 8.10 10.80 13.50 16.20 18.90 21.60 24.30 27.00 32.40 37.80 43.20 48.60 54.00
2.00 0.68 1.35 2.70 4.05 5.40 6.75 8.10 9.45 10.80 12.15 13.50 16.20 18.90 21.60 24.30 27.00
3.00 0.34 0.68 1.35 2.03 2.70 3.38 4.05 4.73 5.40 6.08 6.75 8.10 9.45 10.80 12.15 13.50
4.00 0.23 0.45 0.90 1.35 1.80 2.25 2.70 3.15 3.60 4.05 4.50 5.40 6.30 7.20 8.10 9.00
5.00 0.17 0.34 0.68 1.01 1.35 1.69 2.03 2.36 2.70 3.04 3.38 4.05 4.73 5.40 6.08 6.75
6.00 0.14 0.27 0.54 0.81 1.08 1.35 1.62 1.89 2.16 2.43 2.70 3.24 3.78 4.32 4.86 5.40
7.00 0.11 0.23 0.45 0.68 0.90 1.13 1.35 1.58 1.80 2.03 2.25 2.70 3.15 3.60 4.05 4.50
8.00 0.10 0.19 0.39 0.58 0.77 0.96 1.16 1.35 1.54 1.74 1.93 2.31 2.70 3.09 3.47 3.86
9.00 0.08 0.17 0.34 0.51 0.68 0.84 1.01 1.18 1.35 1.52 1.69 2.03 2.36 2.70 3.04 3.38
10.00 0.08 0.15 0.30 0.45 0.60 0.75 0.90 1.05 1.20 1.35 1.50 1.80 2.10 2.40 2.70 3.00
EXTREMELY INVERSE BS 142
156.1
1.05 39.02 78.05
1.50 3.20 6.40 12.80 19.20 25.60 32.00 38.40 44.80 51.20 57.60 64.00 76.80 89.60
2.00 1.33 2.67 5.33 8.00 10.67 13.33 16.00 18.67 21.33 24.00 26.67 32.00 37.33 42.67 48.00 53.33
3.00 0.50 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 12.00 14.00 16.00 18.00 20.00
4.00 0.27 0.53 1.07 1.60 2.13 2.67 3.20 3.73 4.27 4.80 5.33 6.40 7.47 8.53 9.60 10.67
5.00 0.17 0.33 0.67 1.00 1.33 1.67 2.00 2.33 2.67 3.00 3.33 4.00 4.67 5.33 6.00 6.67
6.00 0.11 0.23 0.46 0.69 0.91 1.14 1.37 1.60 1.83 2.06 2.29 2.74 3.20 3.66 4.11 4.57
7.00 0.08 0.17 0.33 0.50 0.67 0.83 1.00 1.17 1.33 1.50 1.67 2.00 2.33 2.67 3.00 3.33
8.00 0.06 0.13 0.25 0.38 0.51 0.63 0.76 0.89 1.02 1.14 1.27 1.52 1.78 2.03 2.29 2.54
9.00 0.05 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.20 1.40 1.60 1.80 2.00
10.00 0.04 0.08 0.16 0.24 0.32 0.40 0.48 0.57 0.65 0.73 0.81 0.97 1.13 1.29 1.45 1.62
The general equation for all IEC/B142 curves is as follows:
12-4
ANNEX 2 TIME CURRENT CURVES FOR 51P AND 51N UNITS
TABLE A2-1. TRIP TIMES (IN SECONDS) FOR BS142 CURVES
108.0
135.0
162.0
0
0
234.1
312.2
390.2
468.2
0
5
0
4
=
T
V
MIF Digital Feeder Protection
Dial
100.3
114.7
129.0
143.4
8
2
6
189.0
216.0
243.0
270.0
0
0
0
0
546.3
624.3
702.4
780.4
9
4
9
4
A
*
D
+
+
B
*
D
K
−
P
Q
172.0
200.7
229.4
258.1
0
8
6
4
324.0
378.0
432.0
486.0
0
0
0
0
936.5
1092.
1248.
1404.
9
9
7
8
102.4
115.2
0
286.8
2
0
540.0
0
0
1561.
9
0
128.0
0
0
GEK-106273L
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