In which configuration are line voltage and phase voltage the same?

In a delta configuration, the line voltage and phase voltage are indeed the same. To grasp this concept, it's important to understand the structure of a delta configuration. In a three-phase delta system, each of the three phases is connected end to end, forming a closed loop or triangle shape. Because the voltage is measured across the terminals of each phase, the voltage that appears on the line connecting two phases is the same as the voltage across any one phase.

When you analyze the relationship between line voltage and phase voltage in delta connections, you'll find that each phase effectively experiences the same voltage as the line voltage. This characteristic distinguishes the delta configuration from other types, such as the star or Y configuration, where phase voltage is a fraction of the line voltage, specifically ( \text{Phase Voltage} = \frac{\text{Line Voltage}}{\sqrt{3}} ).

Understanding these differences is crucial for electrical engineers and technicians, especially when designing and troubleshooting three-phase power systems.