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