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How to model over frequency relay tripping?

I am trying to model relay trip action to trip loads/feeders for over-frequency conditions in PSSE dynamic simulations. However, I can't seem to find any suitable model. Most relays are based on underfrequency

LDSHBL, LDSHOW, LDSHZN, LDSHAR, LDSHAL

The only over-frequency relay I found are the:

FRQDCAT, and FRQTPAT,

However, they only disconnect generators, or the whole bus. Is their any over-frequency relay that would trip a load or a percentage of a load?

Mohamed_M's avatar
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Mohamed_M
asked 2026-03-18 14:52:38 -0500, updated 2026-03-24 17:56:32 -0500
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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.

perolofl's avatar
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perolofl
answered 2026-03-31 11:49:26 -0500
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Thanks @perolofl

Mohamed_M's avatar Mohamed_M (2026-03-31 15:58:14 -0500) edit
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