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Do the following:

1. Split the load bus and move the load to be tripped to the new bus (LBUS). Change the bus code to 2.
2. Add a dummy generator at the load bus with Mbase=0.01, Qmax = Qmin = 0.
3. Add dynamic model GENCLS to the dummy generator with H=0.001.
4. Add dynamic model FRQDCAT with ICON(M)=LBUS, ICON(M+1)=LBUS and ICON(M+2)=generator id.

The load is now connected to a fictitious generator bus and model FRQDCAT can be used to trip the bus at overfrequency.