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In your case, I would use four VTGDCAT/VTGTPAT models for each bus. The first two relays are for over voltage relay (i.e., the VL can be set at a very low value). The last two relays are for under voltage relay (i.e., the VU can be set at a very high value). For your particular example, it could be
Model 1: VU = 1.1, VL = 0.2, TP = 1.0, TB = 0.0
Model 2: VU = 1.05, VL = 0.2, TP = 5.0, TB = 0.0
Model 3: VU = 1.5, VL = 0.9, TP = 3.0, TB = 0.0
Model 4: VU = 1.5, VL = 0.7, TP = 2.0, TB = 0.0
TB is an arbitrary number that I put there. You can change it based on your real value.
