Transformer topology

Ground in EveryCircuit should be called zero volt reference, 0V reference, or ZVR. This just gives a reference point for EC to show values in relation to. If you have a Tesla coil circuit and the “hot” end of the Tesla coil was the ZVR then it would seem like the rest of the circuit is what’s experiencing the ultra-high voltages. This is why it’s important to have a ZVR. Since the transformer completely separates the two circuits in terms of DC it’s side of the circuit needs a ZVR too. If you have multiple ZVRs that are connected to each other by something other than a transformer then some current may need to flow into/out of each other to ensure that they are at 0V. This can be remedied by connected them up with a wire and removing all but one.

A bit more to the story, a lot of countries in the world do not have regulations that make it compulsory to use a grounded power supply fitment to a dwelling, all they have is a power supply in and a return wire. These countries normally use a two pin wall plug with no provision for grounding (these are used for equipment that is not double insulated also). The wiring in these situations is quite dangerous, least of all because no safety circuit can be added to provide protection to the occupants. Having worked in some of these countries, I have occasionally run across situations where people have complained about getting a boot from a device, these situations have been rectified by adding a MEN earth to their house wiring. And sometimes fitting an earth leakage device.

In this simulation the circuit only functions by grounding the neutral wire would cause a dead short the ground on a transformer is tied to the case for safety if you tied the neutral wire to ground as seen in the simulation it would 'short to ground '

Remove the transformer from the circuit you now have the equivalent to a table top lamp .on that lamp cord there are just 2 wires that power the lamp 'hot ' and 'neutral' no ground.

@jujuj smaller DC circuits just run from a battery and double insulated devices do not require an earth. This simulator, assumes that some where along the way any circuit shown on it will be connected to mains power in which case for safety sake it had better be earthed. So for safety reasons just live with that, and people's lives will be less at risk.