Question

At the end of a power distribution system, a certain feeder supplies three distribution transformer, each one supplying a group of customers whose connected loads are as under: Transformer Load Demand factor Diversity factor Transformer No. 1 10kW 0.65 1.5 Transformer No. 2 12kW 0.6 3.5 Transformer No. 3 15kW 0.7 1.5 If the diversity factor among the transformer is 1.3; find the maximum load on the feeder.

Answer 1

Answer:

≈ 18.62 kw

Explanation:

Given data :

Diversity factor among transformer = 1.3

No of transformers       load      demand factor   diversity factor

Transformer 1               10 kw      0.65                    1.5

Transformer 2              12 kw      0.6                       3.5

Transformer 3               15 kw      0.7                      1.5

calculate the maximum load on the feeder

demand factor = max demand /  load

Max demand = demand factor * load

max demands:

Transformer 1 = 0.65 * 10 = 6.5

Transformer 2 = 0.6 * 12 = 7.2

Transformer 3 = 0.7 * 15 = 10.5

Diversity factor = ( summation of max demands ) / maximum load on feeder

  1.3 = ( 6.5 +7.2 + 10.5 ) / max load on feeder

hence : max load on feeder = 24.2 / 1.3 = 18.62 kw