What is the high side coil voltage for the 13800 3-phase 4-wire 10 kVA transformer?

To determine the high side coil voltage of a 13800 3-phase 4-wire 10 kVA transformer, it is essential to understand the specifications of the transformer. The high side voltage typically refers to the primary side of the transformer, in this case, which is rated at 13800 volts.

The confusion could stem from calculating transformer voltages during a particular scenario, such as load calculations or voltage drops, where the effective operating voltage may differ from the rated voltage. However, when considering the nominal or rated voltage for the transforming unit, the high side of a transformer rated at 13800 volts will indeed be 13800 volts under normal operating conditions.

When addressing the choice of 7960 volts, this figure may reflect a specific condition based on load or configuration such as a calculation for voltage drop or phase-to-phase versus phase-to-neutral considerations in a delta-wye connection scenario. However, in standard transformer operation for a 13800 volt rated transformer, the high side remains at 13800 volts.

To summarize, the high side coil voltage for a transformer rated at 13800 volts is indeed 13800 volts, as that is the established nominal voltage for operation without further context or modifications.