3 phase simulation problem

See: https://www.circuitlab.com/circuit/3w86b8wury72/3ph-yy/

This circuit is a 3 phase delta-Y connected system; ie 3 voltage sources configured 0 deg, 120 deg, 240 deg, all same voltage connected in a delta configuration and a balanced Y connected load with the Y point grounded. As shown the simulation will not work but if the voltage sources are connected in a Y configuration with the ground on either Y point or if a voltage source is removed making an open delta connection the simulation works as expected. Does anyone have any insight on this??

by Foxx
May 09, 2021

The best way to get an answer to a question is to compose a super rational way to ask it so here is my answer after overnight contemplation: The voltage between any two corners of the delta is doubly defined, first as the voltage of the signal generator connected between the two points and second as the vector sum of the other two signal generator voltages. The CircuitLab simulator cannot handle this so declares an error. The (perhaps kludgey) cure is to put an arbitrarily small resistor in series with one or more of the signal generators. The ground is best connected at the Y point of a Y connected load or even of a dedicated arbitrarily high resistance Y connected load. With these seemingly irrelevant additions the simulator seems to be satisfied.

by Foxx
May 10, 2021

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