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Electric Power Distribution Engineering, 3rd Edition by Turan Gonen

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Chapter 7

Voltage-Drop and Power-Loss Calculations

Any man may make a mistake; none but a fool will stick to it.

M.T. Cicero, 51 B.C.

Time is the wisest counselor.

Pericles, 450 B.C.

When others agree wth me, I wonder what is wrong!

Author Unknown

7.1 Three-Phase Balanced Primary Lines

As discussed in Chapter 5, a utility company strives to achieve a well-balanced distribution system in order to improve system voltage regulation by means of equally loading each phase. Figure 7.1 shows a primary system with either a three-phase three-wire or a three-phase four-wire main. The laterals can be either (1) three-phase three-wire, (2) three-phase four-wire, (3) single phase with line-to-line voltage, ungrounded, (4) single phase with line-to-neutral ...

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