On which side of the TCUL transformer is the no load tap changer installed?

The no load tap changer on a transformer is primarily installed on the high side. This is because the high side of the transformer is where the higher voltage and current fluctuations typically occur. By placing the tap changer on the high side, it allows for adjustments in voltage without needing to interrupt the load, which is crucial for maintaining stable operation and ensuring efficient power delivery. Making voltage adjustments on the high side can help manage varying load conditions and improve the quality of power delivered through the system.

Furthermore, installing the no load tap changer on the high side helps in minimizing disturbances to the grid during voltage adjustments. On the low side, the focus is generally on distribution rather than the control of voltage levels, which is why tap changers are not utilized there. The neutral and ground side options refer to parts of the system that serve different purposes, like reference points for voltage measurements and path for fault currents, rather than for dynamic voltage regulation like tap changers.