u/Foreign-Main-5966

Hello.. I’ve been asked to perform coordination settings for IEEE-33 bus network including 2 PV generation, for down stream relays it works well but when I get close to source the issues emerged that is the relay should tripped isn’t the right one ( as per pics shown ) the R15 (directional OCR ) is supposed to trip first but the miscoordination happen that R13 & R14 trip earlier!

I changed the I pick-up and TMS but still have the same issue.

The contribution of PV makes the fault levels less than the FLA of R15 ,so I don’t know how to fix this ?