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- Suppose two generators supplying a load. Generator-1 has a no-load frequency of 61.5 Hz and a slopesp1 of 1 MW/Hz. Generator-2 has a no-load frequency of 62 Hz and a slope sp2 of 1MW/Hz. The twogenerators are supplying a real load totaling 2.5 MW at 0.8 PF lagging. Draw the resulting systempower-frequency or house-diagrams. Determine (a) at what frequency is the system operating, andhow much power is supplied by each of the generators? (b) if an additional 0.75-MW load wereattached to this power system. What would the new system frequency be, and how much powerwould the each generator supply now? (c) with the system in the configuration described in part (b),what will the system frequency and generators power be if the governor set points on generator-1 areincreased by 0.5 Hz?a short three phase transmission line connected to 33kv 50 hertz generating station at starting and is required to supply a load of 10 MW at pointed start lagging power factor at 30 KV addresses in that is the minimum transmission efficiency is to be determined96% estimate the per face value of resistance and inductance of a lineA 3 phase, wye-connected salient-pole generator has on per phase basis Xd = 2 ohms, Xq = 1.5 ohms and R∅ = 0. When delivering its maximum power output to an infinite bus bar, the terminal and excitation voltages/phase are 1,430 V and 1,495 V, respectively. Find the power angle in electrical degrees at the above conditions
- A generating station has a maximum demand of 25,000 kW. Calculate the cost per unit generatedfrom the following data: Capital cost = P 120M; Annual load factor = 45%; Annual cost of fuel and oil = P6.5M ; Taxes, wagesand salaries etc. = P6M and Interest and depreciation = 13%Two generating stations A and B have the capacities 500MW and 800MW respectively are interconnected by a short line. The percentage speed regulations from no load to full load of the two stations are 2 and 3 respectively. Find the power generation at each station and power transfer through the line if the load on bus of each station in 200MW.Discuss about generator modeling and drive the formula for the real and reactive power supply it .
- Explain the effect of load power factor on the transmission efficiency? Subject Power Transmission and DistributionEstimate the distance over which a load of 15000 KW at p.f-0.8 lagging can be delivered by a 3-phase T.L having conductor each of resistance 0.8 2 per km the voltage at the receiving end is to be 132 KV and the losses in the line is to be 5% of received powerCAN YOU EXPLAIN THE OPERATIONS IN SENTENCES? For the maximum average power transfer in the circuit shown in Figure 2, use the impedance ZLand ZLFind the value of the maximum average power transferred to ?
- While the instantaneous electric power delivered by a single-phase generator under balanced steady-state conditions is a function of time havi ng two components of a constant and a double-frequency sinusoid, the total instantaneous electric power delivered by a three-phase generator under balanced steady-state conditions is a constant. (a) True (b) FalseConsider two interconnected voltage sources connected by a line of impedance Z=jX, as shown in Figure 2.27. (a) Obtain expressions for P12 and Q12. (b) Determine the maximum power transfer and the condition for it toA single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)
