Table 7 Response of protection scheme with variations in SCC of source, X/R ratio, voltage variation (±10 %), frequency variation (±5 %), power flow angle variation
Fault type | Voltage variation (±10 %) | Frequency variation (±5 %) | Power flow angle (δ) | Short circuit capacity of source (MVA) | X/R ratio | Output of classifier | Relay operation time (ms) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
a | b | c | d | e | f | g | |||||||
fg | 125 | 57 | 25 | 250 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 8.330 |
cfg | 127 | 57 | 26 | 450 | 2 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 8.330 |
bcfg | 130 | 58 | 27 | 750 | 3 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 8.330 |
bcdfg | 132 | 58 | 28 | 950 | 4 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 8.330 |
bcdefg | 136 | 59 | 29 | 1250 | 5 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 8.330 |
abcdefg | 139 | 60 | 30 | 1450 | 6 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7.497 |
bd | 141 | 60 | 31 | 1650 | 7 | 0 | 1 | 0 | 0.99 | 0 | 0 | 0 | 4.998 |
bcd | 144 | 61 | 32 | 1950 | 8 | 0 | 1 | 0.91 | 0.99 | 0 | 0 | 0 | 6.664 |
abdf | 147 | 61 | 33 | 1990 | 8 | 0.99 | 0.99 | 0 | 0.99 | 0 | 0.99 | 0 | 9.996 |
abcdf | 149 | 62 | 34 | 2000 | 9 | 0.97 | 0 | 0.93 | 0.61 | 0 | 0.97 | 0 | 9.163 |
abcdef | 150 | 60 | 35 | 1000 | 5 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7.497 |