Diversity factor is defined as the ratio of the sum of individual demand to the max demand on the power station. The diversity factor (DF) is inversely related to the maximum demand (MD). A higher DF indicates that MD will be lower and thus the investment on the station will be lower. It is often desirable to obtain the DF as high as possible.
Example 1: A hydroelectric power station powers 6 feeders having their individual demands 10, 20, 5, 3, 18, and 22 MW each. The overall maximum demand is 50 MW. Calculate the DF.
Sum of individual maximum demands = 10 + 20 + 5 + 3 + 18 + 22 = 78 MW
From the DF equation DF = 78/50 = 1.56
Remember that diversity factor is always larger than 1.
Example 2: A thermal power plant is responsible to power 2 industrial consumers who have their maximum demands of 10 and 30 MW. It also supplies the municipal grid whose maximum demand is 15 MW. The overall maximum demand is 35 MW. Find the DF
Sum of individual demands = 10 + 30 + 15 = 55 MW
DF = 55/35 = 1.57
Other useful formulas: