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

$\begin{array}{llll}\%{I}^{2}R\hfill & =\hfill & \frac{{P}_{\text{LS}}}{{P}_{r}}\times 100\hfill & \hfill \\ \hfill & =\hfill & \frac{{I}^{2}R}{{P}_{r}}\times 100\hfill & (7.59)\hfill \end{array}$

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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