How are power lines balanced when they are more than 3% out of phase?

The best approach to ensure that power lines are balanced when they are more than 3% out of phase involves multiple steps, as suggested by the correct answer. Each of the actions mentioned plays a crucial role in achieving this balance.

First, retesting the phases for proper phase balance with a power analyzer meter is essential. By using a power analyzer, one can accurately measure the phase angles and voltages across the lines, allowing for a comprehensive understanding of any imbalances that exist. This is a critical first step because it provides objective data to inform any corrective measures needed.

Taking current measurements on all single-phase power lines is another important action. This ensures that the current flowing through each line is known, allowing for the identification of any line that may be experiencing overload. Understanding the currents helps in diagnosing problems related to phase imbalances and prepares for informed adjustments.

Lastly, removing the load from the overloaded line and redistributing it to lines that are not overloaded addresses the issue directly. This step is practical and necessary for correcting imbalance problems, as it alleviates the stress on individual lines and helps in achieving an even distribution of loads across the power system.

By combining these actions—measurement, analysis, and load redistribution—the overall power system can be effectively balanced