A generation station of 3 MW supply a two regions A & B .The line losses are neglected and the load variation of these regions is as follow: Region A (Time) 11 a.m From 11 a.m to 6 p.m No-load From midnight to From 5 a.m to From 8 a.m to Load (kw) 5 a.m No-load 8 a.m 1200 800 Region B (Time) From From midnight to 6 a.m to 3 p.m to 7 p.m to 6 a.m 3 p.m 7p.m 9 p.m Load (kw) 400 900 No-load 1800 From From From 6 p.m to midnight 600 From 9 p.m to midnight 200 1-Plot The daily load curve of the total system. 2-Find the load factor, diversity factor,plant user factor and the actual generation by the station in kwh in the day for the total system.

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.)

Let a 100V sinusoidal source be connected to a series combination of a 3 resistor, an 8 inductor, and a 4 capacitor. (a) Draw the circuit diagram. (b) Compute the series impedance. (C) Determine the current I delivered by the source. Is the current lagging or leading the source voltage? What is the power factor of this circuit?

60. An RLC series circuit connected to a 110-volt and 50-cycle AC source, contains the following series resistances and reactances: R1=10 ohm, R2= 15, XL1=20 ohms, XL2=25 ohms, XC= 40 ohms. Find the real power. a. 65.3899 b. 392.4372 c. 397.848 d. 588.6559

what are load values in this power flow system

Show the solution Using 24v AC source design a 24v unregulated power supply circuit that will power a 1kohms load with 50mv ripple. Draw your designed unregulated power supply circuit

8. The total power supplied to a balance delta load is found in the same way as for a balance wye load. True False Either Neither 12. A load of 20 + j35 ohms is connected across a 220 V, 60 Hz supply. Find the reactive power of the load in var. 595 2420 1042 1382 13. A type of DC source where the characteristic output voltage has perfect unidirectional waveform and is based on electrochemical principle. Generator Inverter Converter Battery 14. Calculate the Rf of a circuit whose impedance is 20+j35 and current of 2A. 0.86 0.91 0.50 0.71 15. What capacitor shall be installed in parallel with a circuit to achieve a unity power factor if the reactive power of a circuit is 200VARS and the voltage is 100V. 80.45 microfarad 53.05 microfarad It's already in unity 62.45 microfarad

two generators supplying a load. Generator I has a no-load frequency of 62.5 Hz and a slope Sp1 of I MW/Hz. Generator 2 has a no-load frequency of 62.0 Hz and a slope sp2 of I MW/Hz. The two generators are supplying a real load totaling 2.5 MW at 0.8 PF lagging. (a) At what frequency is this system operating, and how much power is supplied by each of the two generators? (b) Suppose an additional I-MW load were attached to this power system. What would the new system frequency be, and how much power would Gl and G2 supply now? Generator 1 VT V2 Generator 2 VTí KVAR KVAR

Assume that the voltage applied to a load is V = 208- 30° V and the current flowing through the load is I = 5415° A a. Calculate the complex power S consumed by this load. b. Is this load inductive or capacitive? c. Calculate the power factor of this load. d. Calculate the reactive power consumed or supplied by this load. Does the load consume reactive power from the source or supply it to the source?

A generating station has the following daily load cycle: [10] Time 0-6 6-10 10-12 12-16 16-20 20-24 (Hours) Load 40 50 60 50 70 40 (MW) Draw the load curve and find (i) maximum demand (ii) units generated per day (iii) average load and (iv) load factor.