The scenario
A three-phase transformer bank is wired with primary windings in star and secondary windings in delta, providing a primary neutral and a standard 3-wire delta secondary.
What is in this drawing
Read the decisions behind it.
01
Ground the primary star point using net 0 for a stable reference
02
Connect secondary windings in a closed delta loop across terminals U, V, W
03
Add balanced line-to-line resistor loads to complete the secondary circuit
Use when a 3-phase transformer needs a neutral on the primary side but a standard delta service on the secondary; reconnect winding ends for star-star or delta-delta variants.
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