I was working on a circuit which used the (maybe) old version of a Three-Phase-Delta generator. The problem I had then was that the voltage between the phases was 400 V instead of the upset 230 V. So I changed the generator and I'using now the new model. The problem now is that I cannot start the simulation, because no ground is connected. But for this type of application I do not need no ground. In the meantime I solved the problem that I'm using both models in the same sheet, but I leave the old model unconnected.