A generating station supplies the following loads: 15000 kW, 12000 kW, 8500 kW, 6000 kW and 450 kW. The station has a maximum demand of 22000 kW. The annual load factor of the station is 48%. Calculate (i) the number of units supplied annually (i) the diversity factor and (iii) the demand factor.
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- A generating station supplies the following loads : 15000 kW, 12000 kW, 8500kW, 6000 kW and 450 kW. The station has a maximum demand of 22000 kW. The annual loadfactor of the station is 48%.Calculate (i) the number of units supplied annually (ii) the diversity factor and (iii) the demandfactor.A system is working at its maximum kVA capacity with a lagging power factor 0·7. An anticipated increase of load can be met by one of the following two methods: By raising the p.f. of the system to 0·866 by installing phase advancing equipment. By installing extra generating plant. If the total cost of generating plant is Rs 100 per kVA, estimate the limiting cost per kVA of phase advancing equipment to make its use more economical than the additional generating plant. Interest and depreciation charges may be assumed 10% in each case.A generating station supplied the following loads: 150 MW, 120 MW, 85 MW, 60 MW, and 5 MW. The station has a maximum demand of 220 MW. The annual load factor of the station is 48%. Calculate : 1) the number of units supplied annually 2) diversity factor 3) demand factor
- 2) The net inlet to a factory powered by a 2300 volt infinite busis measured as 765 A, for a lag 0.92 power factor. although mostloads is inductive, the input power factor has been improved by installing asynchronous capacitor operating at its nominal value of 1000 KVA. Determine the factor oforiginal factory power.The yearly load duration curve of a certain power station can be approximated as a straight line ; the maximum and minimum loads being 80 MW and 40 MW respectively. To meet this load, three turbine generator units, two rated at 20 MW each and one at 10 MW are installed. Determine (i) installed capacity (ii) plant factor (iii) kWh output per year (iv) load factor.A generating station supplies the following loads: 15000 kW, 12000 kW, 8500 kW, 6000 kW and 450 kW. The station has a maximum demand of 22000 kw. The annual load factor of the station is 48%. Calculate (i) the number of units supplied annually (ii) the diversity factor and (ii) the demand factor.
- (II) If 35 MW of power at 45 kV (rms) arrives at a town froma generator via 4.6Ω transmission lines, calculate (a) theemf at the generator end of the lines, and (b) the fractionof the power generated that is wasted in the lines.A 100KVA, 220V, a star-connected alternator is loaded at full load and at 60% pf lagging.The effective AC resistance per phase is 0.01411Ω. If the synchronous reactance is 4.5times the effect of the armature leakage reactance wherein the later is 0.046 Ω perphase, find(a) the phase voltage that would be generated at the load if the circuit were operating normally(b) What no-load open-circuit phase voltage must be present in order to circulate full-load current in short-circuit state while maintaining the same speed and field current?(c) What is the terminal phase voltage of the alternator when it is under a shorted load condition? Give an explanation in support of your response using just one sentence. The IA phasor should be used as the reference one.. A power station has a connected load of 48 MW. The energy generated for the year is 61,500 MWh. If the station has a load factor of 35%, solve the demand factor of the station. Answer: 0.4179 or 41.79% Subject: Distribution System and Substation Design
- A three-phase system includes a 346.4 V line-to-line supplying a three-phase motor rated 15KVA 0.8pf lag plus additional balanced constant impedance loads. The single-phase representation of the system is shown below. Assume that sources and loads are Y-connected. 1. What is the RMS value of the line current, I in A? 2. If this set of loads will be supplied through a service transformer. What should the minimum size of the transformer in kVA? 3. What should be the size of three-phase capacitor(that will be added to the load mix) to improve power factor to almost 0.95 lag?If for example communication power is often normalized by assuming R to be a unity in Ohms, although R may be another value in actual circuit. If the actual value of the power is required, it is worked out by de-normalization of the normalized value. Use the above to determine the instantaneous power, given time interval to be (-4,4) and x = 2 + t2.1. Voltage between 1 kV and 50 kV is defined as: A.Very High Voltage B.Medium Voltage C.Low Voltage D.High Voltage A factory consumes 400, 000 kVAh in a year witth the yearly average power factor 0.75. Calculate the average demand and percentage of annual load factor if the maximum demand is 120kW. A.Average demand = 44.25kW, Load factor = 29% B.Average demand = 44.25kW, Load factor = 39% C.Average demand = 34.25kW, Load factor = 29% D.Average demand = 34.25kW, Load factor = 39% The example of low voltage system is: A.Three-phase, 4-wire, 415 V, up to 45 kVA maximum demand B.Three-phase, 3-wire, 66 kV, 132 kV and 275 kV for exceptionally large load of 25 MVA maximum demand C.Three-phase, 3-wire, 11 kV for load of 1000 kVA maximum demand and above D.Three-phase, 3-wire, 22 kV or 33 kV for load of 5000 kVA maximum demand and above A load rises from zero to 20 kW instantaneosly and stays constant for 2 minutes, then rises about 40…