So my first attempt is clearly well off, but I think I need to find the corrected reactive power in order to calculate the new P.F.
cosø = MW/MVA
Active power of load MVAcosø = 11*10^6 * 0.6 = 6.6MW
Reactive power of load MVAsinø = 11*10^6 * 0.8 = 8.8MVAr lagging
Active power of synchronous...
So I understood 1 unit of billed electricity to = 1000W, so 1KW consumed in an hour would = 1KWhr
Your calculation makes obvious sense now, the surcharge costs calculates to £4160.00
3% of this cost combined with the unit charge gives me £514.80 * (0.8 - 0.6)/0.05 = £2059.20
All three costs...
Thanks for the response, so for the max demand surcharge I have taken this to be an additional two-part cost,
Part one, max demand of 18MW will be at standard charge of 2.5pence per unit, so to convert 18MW to units, (18*10^6)/1000 = 18000 units
18000 units at 2.5pence per unit then converted...
So finally getting some time to come back to this, for (ii) think there are essentially 3 costs to calculate,
Pence per unit charge:
Unit cost, (520000 * 2.5)/100 = £13,000
Max demand surcharge:
(18*10^6)/1000 = 18000 units
18000*2.5 = 45000/100 = £450.00
(2*10^6)/1000 = 2000 UNITS...
Homework Statement
A factory has an average demand of 520 000 units per week. The
maximum demand is 25 MVA at 0.8 power factor and the minimum
power factor of 0.6 occurs when the demand is 11 MVA.
The factory is charged at 2.5 pence per unit with a surcharge of 0.2 pence
per unit for each 500...