If the higher voltage of a slash-rated three-phase voltage system equals twice the lower voltage, how is the system configured?

In a three-phase voltage system, the configuration determines the relationship between the line voltage and the phase voltage. In a delta connection, the line voltage is equal to the phase voltage, whereas in a wye connection, the line voltage is equal to the phase voltage multiplied by the square root of three (approximately 1.732).

When considering a system where the higher voltage equals twice the lower voltage, this suggests a distinct relationship between the line and phase voltages characteristic of a delta configuration. Here, if the line voltage is the higher voltage, it indicates that the phase voltage must be lower but specifically half of the line voltage in this situation. This results in each phase maintaining a voltage level that is compatible with such an expression.

In this context, the other options, such as wye connection, would not support this voltage relationship, as the wye configuration inherently creates a situation where the line voltage is greater than the phase voltage, not allowing the condition of one voltage being double the other to be satisfied. Star connection typically refers to the same structure as wye, leading to similar conclusions regarding voltage relationships. Loop-connected systems do not fit within standard configuration definitions for three-phase systems regarding specific voltage ratios. Hence, a delta connection is the only configuration