Use the data given in Example 2.6 and also consider the following added new load. Suppose that several buildings that have electric air-conditioning are converted from gas-fired heating to electric heating. Let the new electric heating load average 200 kW during 6 months of heating (and off-peak) season. Assume that off-peak energy delivered to these primary feeders costs the NL&NP Company 2 cents/kWh and that the capacity cost of the power system remains at $3.00/kW per month.
a. Find the new annual load factor on the substation.
b. Find the total annual cost to NL&NP to serve this new load.
c. Why is it that the hypothetical but illustrative energy cost is smaller in this problem than the one in Example 2.8?
Example 2.6
Use the data given in Example 2.1 for the NL&NP's load curve. Note that the peak occurs at 4 PM. Determine the following:
a. The class contribution factors for each of the three load classes
b. The diversity factor for the primary feeder
c. The diversified maximum demand of the load group
d. The coincidence factor of the load group
Example 2.8
Assume that the Riverside distribution substation of the NL&NP Company supplying Ghost Town, which is a small city, experiences an annual peak load of 3500 kW. The total annual energy supplied to the primary feeder circuits is 10,000,000 kWh. The peak demand occurs in July or August and is due to air-conditioning load.
a. Find the annual average power demand.
b. Find the annual load factor.