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http://www.pqsoft.com/ferroview/

The program analyses the common problem where the transformer becomes isolated on a length of cable with one or two phases open. This can happen after a fault or when the unloaded transformer is being manually switched one phase at a time.

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FerroView handles 3-legged and 5-legged core designs as well as three uncoupled cores (triplex or bank of transformers). The primary connection can be grounded wye, ungrounded wye, or delta. The models cover typical modern designs, with customized versions available for an additional fee.

You can do some customization on your own by entering particular cable types and transformer sizes that are not already defined. An extensive Help system is included that also provides an excellent tutorial on ferroresonance.

You can adjust the following parameters:

Transformer core design and winding connection
Transformer size, impedance, and core losses
Cable capacitance and length
Open phase(s)
Voltage class
Per unit voltage
Starting voltage phase angle
Short circuit impedance
Resistive load