What is the approximate voltage to ground of a "high Leg" or "Stinger Leg" on a three-phase open Delta system?

In a three-phase open delta system, the "high leg" or "stinger leg" refers to one of the phases that is derived from a delta configuration. In this configuration, voltage measurements are taken relative to the ground. The high leg is typically connected to a voltage that is higher than the standard phase-to-ground voltages.

For a common application where the system operates at 240/480 volts, the line-to-ground voltage of the high leg would indeed approximate 208 volts. This value arises from the way the phases are configured and the relationships between the line-to-line and line-to-ground voltages in a delta system. Specifically, in a typical three-phase system with one phase at the neutral point and the other phases “stinger” and "high," the voltage is determined based on the geometry of the triangular (delta) system.

Understanding this, the high leg of an open delta system is effectively utilizing one of the line-to-line voltages, 480 volts, divided by √3 (approximately 1.732) to get the corresponding line-to-ground voltages. When calculated, this results in about 277 volts for the higher phase and around 208 volts for the lower phase in relation to ground. This makes 208