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I am hoping that there will be a simple answer to this, but I cannot seem to find anything in the manuals.

I am trying to test each bus in the working dynamic simulation case for over-voltage. I found the following python commands in the API and the corresponding description in the Program application guide (#2):

These are the commands and my understanding of them:

psspy.vltscn(status, vhi, vlo) #enables strict checking of high and low voltage thresholds
psspy.set_voltage_dip_check(args) # allows checking for undervoltage with some time delay to return to within acceptable bounds
psspy.set_voltage_rec_check(args) # allows user to check for recovery from a fault within an accpetable time frame both primary and secondary allowed.

The following picture is from the Program application Guide.

My understanding is:

1. V1 & t1 and V2&t2 correspond to the set_voltgae_rec_check() function
2. V3 & t3 correspond to the set_voltage_dip_check() function
3. V4 and V3 correspond to the vltscn() function -- assuming that Vhi = V4 and Vlow = V3.

My question is how to set up testing for the over voltage that occurs in time duration t4? This does not seem to be the functionality of set_voltage_dip_check() or set_voltgae_rec_check()..... and vltscn() does not have a time argument.

Any help would be much appreciated. Thanks.