Question

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(6) The following table shows the readings of the kWh meter of a factory for 8 hours. The ratings of all of the loads in the factory total to 1000 kVA at 0.85 lagging power factor. Time Meter reading (k Wh) Time Meter reading (kWh) 00:30 100 04:30 1850 01:00 210 05:00 2200 01:30 310 05:30 2530 02:00 1450 06:00 2850 02:30 620 06:30 3130 03:00 850 07:00 3350 03:30 11 00 07:30 3550 04:00 1450 08:00 3700 (k Wh meter reading starts at 0 kWh at time 00:00) The average power factor is recorded to be 0.76 lagging. (a) If the maximum demand interval specified by the utility is 30 minutes (i) Calculate the maximum demand incurred by the factory for the 8-hour period. (ii) Determine the demand factor and load factor for the 8-hour period. (iii)If the above 8 hours represent the daily operation of a factory, calculate the monthly charges (30-day month) when the customer have a contracted capacity of 780 kW and the charges are as follow: Usage Charge 15¢ / kWh Contracted Capacity Charge/month $9/ kW Uncontracted Capacity Charge/month $12/kW Reactive Power Charge 0.50c / kVarh * Applicable only to reactive units (kVArh) in excess of 62% of the kWh usage. d to 1 hour and the average power factor is (b) Repeat (a) if the demand interval is revise improved to 0.80 lagging. (Ans: (a) 6) 800 kW;(i1) 0.94, 0.578(ii) $24,040.50 (b) (0) 750 kw: (ii) 0.617; () 0.88,0.617: (ii) $23,742.15)

Answer 1

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