Implementation of Optimal Protection Coordination for Microgrids with Distributed Generations Using Quaternary Protection Scheme

Table 9

Dual-directional overcurrent relay settings for the quaternary protection coordination scheme.

Relay	DG operating	Grid-connected microgrid in forward direction		Grid-connected microgrid in reverse direction		Islanded microgrid in forward direction		Islanded microgrid in reverse direction
		Is (pu)	TMS (s)	Is (pu)	TMS (s)	Is (pu)	TMS (s)	Is (pu)	TMS (s)
R1	Status 1	0.908971	0.050000	0.830400	0.050000	0.870798	0.065532	0.774000	0.050000
	Status 2	0.920024	0.050000	0.752000	0.050000	0.926764	0.050706	0.812000	0.050000
	Status 3	0.816757	0.050000	0.891734	0.050000	0.651192	0.057826	0.578151	0.386953
R2	Status 1	0.842845	0.134825	0.961430	0.050535	0.774384	0.096503	0.892387	0.056220
	Status 2	0.772070	0.128937	0.832167	0.050000	0.813987	0.094885	0.822938	0.050000
	Status 3	0.851258	0.118257	0.970237	0.050000	0.552425	0.192863	0.582199	0.050016
R3	Status 1	0.922905	0.050000	0.870209	0.143880	0.841449	0.050000	0.857803	0.074514
	Status 2	0.808935	0.050000	0.888088	0.120719	0.902977	0.050000	0.803077	0.050000
	Status 3	0.859760	0.050000	0.929486	0.139762	0.895631	0.050187	0.819987	0.111881
R4	Status 1	0.738000	0.057891	0.771048	0.050004	0.761133	0.056368	0.767017	0.055154
	Status 2	0.847584	0.077759	0.869435	0.050000	0.804075	0.167440	0.859151	0.052559
	Status 3	0.811748	0.050000	0.850455	0.050000	0.769846	0.050000	0.880659	0.050052
R5	Status 1	0.990237	0.056325	0.901277	0.115700	0.833758	0.052783	0.890626	0.050322
	Status 2	0.729298	0.050000	0.728047	0.159616	0.796449	0.050000	0.901522	0.086345
	Status 3	0.818587	0.050000	0.726000	0.064150	0.869643	0.056577	0.801000	0.050000
R6	Status 1	0.739626	0.102973	0.777452	0.050251	0.811765	0.050000	0.869746	0.064470
	Status 2	0.750279	0.078815	0.850592	0.050000	0.800000	0.050000	0.953794	0.050007
	Status 3	0.715141	0.122780	0.760580	0.050000	0.860723	0.084716	0.810000	0.050000