Electric Power Generation, Transmission, and Distribution

As an example of calculating a load estimate at a point in a circuit, assume the following (where for
simplicity, weather considerations have been neglected):

.Below the point selected, the circuit is radial.

.It is desired to estimate the peak-kW of the group of customers for a weekday in February. It is

also desired to calculate the combined kW load of the two customers at 2 pm on a weekday in

February.

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

Number of customers

123456789101112131415161718192021

Diversified factor

FIGURE 24.8 Diversity factor curve for residential class for weekdays during February at normal weather
conditions.

0.0

1.6

− 10

Weather condition

Scaling factor

10 30 50 70 90

1.2

0.2

0.4

0.6

0.8

1.0

1.4

FIGURE 24.9 Representative variation of load scaling factors for residential customers as a function of weather
condition.