LADWP Electric Station Operator – Circuit Breakers, Disconnects, Transformers Practice Test

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

Only single-phase for lighting

Only three-phase for equipment

Both single-phase and three-phase loads

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.

Neither

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