QUESTION
a) Give five desirable characteristics of a tariff. (5 marks)
b) Calculate annual bill of a customer whose maximum demand is 100kw,p.f = 0.8 lagging and a load
factor of 60%.The tariff used is Ksh.75 per Kva of maximum demand plus 15 cts per kWh consumed.
(3 marks)
c) Explain the following methods of tariff;
(i)Block rate
(ii)Two-part tariffs (2 marks)
d) A tariff in force is Ksh.50 per Kva of maximum demand per year plus 10 cts per kWh.A consumer has a maximum demand of 10 Kw with a load factor of 60% and a p.f of 0.8 lag. Show the effect of improving the load factor to 80% with the same maximum demand and p.f on the total cost per kWh. (4 marks)
QUESTION
4 a) Explain four disadvantages of low power factor. (4 marks)
b) A 3-phase induction motor operates on full load with efficiency of 89% and a p.f of 0.85 lagging. Calculate the Kva rating of capacitor bank required to raise full load the power factor at 0.95 lagging. What will be the capacitance per phase if the capacitors are connected in (i) delta (ii) star (6 marks)
c) Show that for consumer taking power of P Kw at a power factor cos?1 charged at Ksh A per kVA maximum demand plus a flat rate per kWh,the most economical power factor after installing a power factor improvement equipment should be;
cos?2 =
Where cos?2 = power factor after correction
B = the cost of per Kvar of the p.f correction equipment. (4 marks)
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