Research Article
A New Hybrid Nelder-Mead Particle Swarm Optimization for Coordination Optimization of Directional Overcurrent Relays
Table 3
Operating time of P/B relays for an IEEE 8-bus test system (LP problem).
| Proposed NM-PSO method | Backup relay | Primary relay | Constraint value | No. | Operating time | No. | Operating time |
| 6 | 0.3134 | 1 | 0.1130 | 0.2004 | 9 | 1.0422 | 8 | 0.1110 | 0.9312 | 7 | 0.3413 | 8 | 0.1110 | 0.2303 | 1 | 1.6338 | 2 | 0.1412 | 1.4926 | 10 | 0.3875 | 9 | 0.1875 | 0.2000 | 7 | 0.3413 | 2 | 0.1412 | 0.2001 | 2 | 0.3551 | 3 | 0.1551 | 0.2000 | 11 | 0.3762 | 10 | 0.1760 | 0.2002 | 5 | 0.9522 | 6 | 0.1203 | 0.8319 | 14 | 0.6439 | 6 | 0.1203 | 0.5236 | 8 | 0.3320 | 13 | 0.1313 | 0.2007 | 9 | 1.0422 | 14 | 0.0808 | 0.9614 | 5 | 0.9522 | 7 | 0.0515 | 0.9007 | 1 | 1.6338 | 14 | 0.0808 | 1.5530 | 13 | 1.6758 | 7 | 0.0515 | 1.6243 | 3 | 0.3585 | 4 | 0.1584 | 0.2001 | 12 | 0.3848 | 11 | 0.1578 | 0.2270 | 4 | 0.4000 | 5 | 0.2000 | 0.2000 | 13 | 1.6758 | 12 | 0.1943 | 1.4815 | 14 | 0.6439 | 12 | 0.1943 | 0.4496 |
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