Station service transformers provide single-phase power for lighting and three-phase power for equipment. Which statement best describes their output?

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Prepare for the LADWP Electric Station Operator Test with questions on circuit breakers, disconnects, and transformers. Study with multiple-choice questions and detailed explanations to excel in your exam!

Multiple Choice

Station service transformers provide single-phase power for lighting and three-phase power for equipment. Which statement best describes their output?

Explanation:
These transformers are designed to serve both lighting and equipment loads in a station. The three-phase secondary powers motors and other three-phase equipment, while a derived single-phase circuit (from one phase to neutral or from a dedicated single-phase winding) feeds lighting. Because of this dual capability, the output can supply both single-phase and three-phase loads, which is why this option is the best description.

These transformers are designed to serve both lighting and equipment loads in a station. The three-phase secondary powers motors and other three-phase equipment, while a derived single-phase circuit (from one phase to neutral or from a dedicated single-phase winding) feeds lighting. Because of this dual capability, the output can supply both single-phase and three-phase loads, which is why this option is the best description.

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