In a 3-phase, 4-wire wye connected system with a voltage range between 50V and 1000V, what is typically grounded?

In a 3-phase, 4-wire wye connected system, it is standard practice to ground the neutral conductor. This practice helps establish a reference point for the system voltages and enhances the safety of the electrical installation. Grounding the neutral conductor ensures that any fault currents can safely return to ground, minimizing the risk of electric shock or equipment damage.

Additionally, grounding the neutral can help maintain system voltage stability during unbalanced load conditions and can facilitate protective relaying schemes that can detect faults more effectively. This is particularly important in three-phase systems where unbalanced loading can lead to significant overvoltages on the phases if proper grounding is not implemented.

Grounding only the phase or ground conductors is not typical in wye systems, as it would not provide the same level of protection or stabilize the system's voltage levels effectively as grounding the neutral would do.