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Electric Power Distribution Engineering, 3rd Edition by Turan Gonen

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7.4 Percent Power (or Copper) Loss

The percent power (or conductor) loss of a circuit can be expressed as

% I 2 R = P LS P r ×100 = I 2 R P r ×100 (7.59)

where

PLS is the power loss of a circuit, kW

= I2R

Pr is the power delivered by the circuit, kW

The conductor I2R losses at a load factor of 0.6 can readily be found from Table 7.5 for various voltage levels.

Table 7.5

Conductor I2R Losses, kWh/(mi year), at 7.2/12.5 kV and a Load Factor of 0.6

Single Phase

“V” Phase

Three Phase

Annual Peak

6Copper

4Copper

2Copper

6Copper

4Copper

2Copper

6Copper

4Copper

2Copper

1Copper

1/0Copper

2/0Copper

Load (kW)

8 Copper

4 ACSR

2 ACSR

1/0ACSR

8Copper

4 ACSR

2 ACSR

1/0ACSR

4 ACSR

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