Hydro power plant costs Tk. 45×101º with maximum capacity of (x+6) MW.

For a power station the yearly load duration curve is a straight line from 50,000 to 4000 kw. To meet the load three turbogenerators are installed. The capacity of two generators is 20,000 kw each and the 3rd is rated at 7,000 kw. a. Draw the annual load duration curve b. Determine the following the Energy generated per year, Load factor and Annual Capacity factor.

A generator supplying a load is shown in the figure. A second load is to be connected in parallel with the first one. The generator has a no-load frequency of 61.0 Hz and a slope S, of 1 MW/Hz. Load I consumed a real power of 1000 kW at 0.8 PF lagging while load 2 consumes a real power of 800 kW at 0.707 PF lagging. a) Before the switch is closed, what is the operating frequency of the system? b) After load 2 is connected, what is the operating frequency of the system? c) After load 2 is connected, what action could an operator take to restore the system frequency to 60 Hz? Load 1 Turbine generator Load 2

A customer's plant has two loads in parallel connected to the distribution lines of the power plant. The first load consists of 50 KW of heating and is resistive. The second load is a set of motors operating at 0.86 retarding power factor. The motor load is 100 KVA. Power is fed to the plant at 10,000 volts rms. Determine the total current flowing from the facility lines in the plant and the power factor of the entire plant.

A 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.)

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) False

3. A yearly load duration curve of a gas turbine power plant is a straight line from 50,000 to 5,000 kW. The load is taken by a power plant that consists of two units of 30,000 kW each and one unit of 20,000 kW. Determine: (a) Installed capacity (b) Plant factor (c) Maximum demand (d) load factor and (e) utilization factor of the plant.

Two identical 2000 kVA alternators operate in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz. What is the maximum unity pf load that can be delivered without overloading either machine

Problem 3 An electric table saw, a wood shaper, and a motor load of a workshop establish an 18 kVA power demand at 50 percent lagging power factor on a 220 V, 60 Hz supply. a) Establish the power triangle for the load. b) Determine the power-factor capacitor that must be place in parallel with the load to raise the power factor to 90 percent lagging.

6. Two alternators running in parallel supply a lighting load of 2000KW and a motor load of 4000KW at p.f. 0.8 lagging. One machine is loaded to 2400KW at p.f. 0.95 lagging. What is the output and power factor of the second machine? (Ans. 3600 Kw, 2211.16 KVAR, 0.8521 lag.)