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Hello,

I'm working with a simulation focusing on load shedding methods, counting on load relay models, LVSHBL and LDSHAL.

Firstly, I found that only on load relay model can be applied on a single load, but I can configure both at the same bus by setting specific load id for one of it while setting no load id with a asterisk for the other. I don't know whether that would work because I haven't run it yet.

Secondly, this is what I met, I configured LVSHBL for each load bus and a LDSHAL model for All, but only LVSHBLs work even the frequency decreased beyond the shed point of LDSHAL. I delete all LVSHBL models and run again, then UFLS occurs. At last I exchanged the models, LDSHBL for every bus and LVSHAL for All loads, then simulation shows only LDSHBL works.

So, does it mean that only local load relay models can work, then the models set on the level of Area, Zone, All loads will be disabled?

Thank you for any help.