B) Four regions of peak loads 5 MW, 7 MW, 8 MW and 10 MW are supplied by a generating station. The average annual load factor is 0.6 and the diversity factor at the station is 1.5. Calculate: (i) Annual energy supplied by the station (ii) The maximum demand on the station. (iii) If the installed capacity is greater than maximum demand by 20%, suggest the best number of units should be used to cover the load curve
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- 2. a) Explain the terms load factor and diversity factor. b) Discuss the advantages of interconnected grid system. c) A generating station is to supply four regions of load whose peak loads are 10 MW, 5 MW, 8 MW and 7 MW. The diversity factor at the station is 1-5 and the average annual load factor is 60%. Calculate: (i) the maximum demand on the station, (ii) annual energy supplied by the station and (iii) suggest the installed capacity and the number of units.Equal area criteria is a method used to calculate: Select one: O a. None of the answers b. Critical clearing angle and time for transient faults O c. Critical clearing voltage angle for transient faults d. Transient stability current limit O e. Steady state stability power limitsTable Q2a Time (hours) 0-6 6-12 12-14 14-18 18-24 Load (MW) 45 90 135 150 75 Referring to the Table Q2a; i) Draw the load curve and the load duration curve [Use the graph paper provided] ii) Indicate the base load and the peak load on the graph. Determine the values for both loads. iii) Choose the suitable generating units to supply the load and list their operating schedules. Later, compute the total installed capacity. iv) Calculate the load factor and the plant capacity factor. Discuss the impact on the operating schedule if the plant capacity factor increases to 0.9.
- The peak load on a 50 MW power station is 39 MW. It supplies power through for transformers whose connected loads are 17, 12,9 and 10 MW. The maximum demands on these transformers are 15, 10, 8 and 9 MW respectively. The annual load factor is 50% and the plant is operating for 65% of the period in a year. 102. The average load on the station is (A) 50000 kW (C) 39000 kW (B) 19500 kW (D) 48000 kW. 103. The energy supplied per year is (A) 438 x 106 kWh (C) 170.82 x 106 kWh (B) 341.64 x 106 kWh (D) 420.48 x 106 kWh.2. When a large shunt capacitor is suddenly connected in parallel with the load bus in the distribution feeder, what would happen to this bus current? O A. Increase B. Decrease D. None of AboveWhat effects are produced by change in voltage? 1. Iron los..........varies approximately as V². 2. Cu loss..........it also varies as V² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa.
- A generator operating at 50 Hz delivers 1 p.u. power to an infinite bus through a transmission circuit in which resistance is ignored. A fault takes place reducing the maximum power transferable to 0.5 p.u. Where as before the fault, this power was 2.5 p.u. and after the clearance of the fault, it is 2 p.u. The value of 8 is max7. TY Hat CHICL Ans. 1. Iron los.........varies approximately as V². 2. Cu loss..........it also varies as ² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa. quemsThe busbars of a gonerating station are divided into two soctions A and B by a busbar reactor rated at 8000KVA with 9% reactive drop. On busbar A there are two generators each of 8000 KVA with 12.5% reactance and on busbar B there are two generatore each of 10,000KVA with 10% reactance. Feeders are taken. from sections A and B separately. Calculate the rupturing capacity of each foeder switchgear for 3-phase faults which may occur on any feeder. Ans: Feeder A 189 MVA; Feeder B 252 MVA
- The bus bars of a power station are in two sections A and Bseparated by a reactor. Connected in section A are two 12MVA generators of 15% reactance each and to B, 8 MVAgenerator of reactance 10%. The reactor is rated 8 MVA and15% reactance. Two feeders are connected to bus bar Athrough transformers, each rated at 4 MVA and 5% reactance.Determine the maximum short circuit MVA with which circuitbreakers on the outgoing side of the transformers have todeal.Q1. 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 urbine 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 factorThere are 144 fuel cells are joined in a series through interconnects.there will be 4 stacks having 36 cell in each stack.these stacks are then oragnised in series and parallel combination to form a single module to deliver required voltage and output power.this SOFCs module then combined with CHP system to get thermal . From this data answer the following questions. a)Calculate voltage losses of module?.this question is very compulsory. b)Electrical efficiency of module? C)Thermal efficiency when module combine with CHP system? D)Combined electrical and thermal efficiency? The input parameters of single cell are given below: Ocv=1.020 Current density=2250mA/cm2 Power density=850mw/cm2 Cell active area= 121cm2 Net power=15kw System fuel utilization=80% Operating temp=550°c Cell voltage=0.8v Power of single cell=103 watt.