The instantaneous voltage and current for the network in series having a voltage and current describe by v(t)=-100 sin (120zt-60°) V and i(t) = 10 cos(120nt -30°) A. (a) Calculate the value of average power (P) flowing into the network and (b) determine the values of a series-connected R-L that model the network.
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- Find the following: the power drawn by the 100ohm variable resistor If the variable resistor is set to 200-ohms, instead of 100-ohms, What is the power drawn by the 200-ohms resistor? total current of the system Is the circuit inductive, capacitive, or neither (resistive)? NOTE: Polar form for Voltage & Current. Rectangular form for Impedancelow voltage systems In the circuit given below, single-phase powers connected to the single-phase network are given. If the effective value of the applied voltage is 220 V, the amplitude of the current drawn from the network(I) how many A?(Note: - sign indicates phasor state) A)142,85 B)119,34 C)129,16 D)137,86A network is supplied by a 120 V rms, 60-Hz voltage source. An ammeter and a wattmeter indicate that 12 A rms is drawn from the source and 800 W are consumed by the network. Determine: a. The network power factor b. The network phase angle c. The network impedance d. The equivalent resistance and reactance of the network
- A ower system is operating at 1000Mw, 132kV, 50Hz, with 0.8 p.f. laging in parallelwith another line at 750OMW, 132kV, 50Hz with 0.707 p.f. lagging. Both are interconnectedat the station and when the compensating device is on, the overall power factor isimproved to 0.9 lagging. Suggest suitable capacitors, shunt and series. Individual loadsand combined load are to improve power factor to 0.9 in all cases.Circuit elements with an inductance of 200 mH, a capacity of 50 μF and a resistance of 10 Ω are connected in parallel. If the average value of 198 V sinusoidal AC voltage is applied to this system, find the line current, impedance and phase angle of the circuit. (Take the frequency as 60 Hz.)A series circuit of RLC with following parameters, R=15 ohm, L=20 m H & C=100 micro Farad. VT=169.7 sin (337t-30) Volt. Find the following: Zt, , It, Voltage across each element, Power factor, apparent power, real or average power and reactive power and the total phasor diagram and power phasor diagram
- A transmission line with impedance of 0.085 + j 0.32 Ω is used to deliver power to a load. The load is inductive and the load voltage is 200∠0° Vrms at 60Hz. If the load operates at 20 kVA with a power factor of 0.75 determine the real and quadrature power losses in both the load and the line and the source voltage phasor.The sending-end voltage in the circuit seen is adjusted so that the load voltage is always 13,800 V(rms). The variable capacitor is adjusted until the average power dissipated in the line resistance is minimum. 1. a) If the frequency of the sinusoidal source is 60 Hz, what is thevalue of the capacitance in microfarads?2. b) If the capacitor is removed from the circuit, what percentageincrease in the magnitude of Vs is necessary to maintain 13,800V(rms) at the load?3. c) If the capacitor is removed from the circuit, what is thepercentage increase in line loss?PLS USE 4 DECIMAL PLACES FOR THE FINAL ANSWERS An inductive reactance of 10 ohms is connected in parallel with the capacitive reactance of 30 ohms. If the combination is connected in series with a 10 ohm resistance. The given voltage is 200V. *What is the total real power of the system in magnitude with unit of kW? *What is the total real power of the system in magnitude with unit of kVAR? *What is the total impedance in polar form in ohms? *What is the total real power of the system in magnitude with unit of kVA? *What is the total current in polar form in A?
- a) You have been employed as an electrical engineer by a power transmission company to design a short transmission line to supply power to a light-industrial load consumer with power system specification as follows, a 3-ph, 60Hz overhead short transmission line with a line-to-line voltage of 23KV at the load end, line impedance of 2.48 ±j6.57Ω/phase, the industry has a cumulative consumption of 9MW with a power factor of 0.85 of lagging as a result of several induction motor on its production lines.As part of the regulations for connections to the grid, you are to provide justifications and values to the Energy Commission of Ghana.(i) What would be value of the voltage between the live conductor and the neutral, between live and live voltages at the industrial premises of the factory?(ii) What load angle would expect the factory to be operating at?S.2) The serial impedance of the 300 km power transmission line is 23 + j75 ohm / phase and the shunt acceptance is j500 microS / phase. A power of 50 MW with a power factor of 0.88 under 220 kV interphase voltage from the end of the power transmission line being shot. Using these data of the energy transmission line, a) Characteristic impedance of the energy transmission line, b) Natural apparent power of the energy transmission line according to the 220 kV interphase operating voltage, c) The values of the line parameters A, B, C and D of the transmission line using hyperbolic functions, d) Calculate the maximum power that the power transmission line can transmit.Find the total impedance, total current drawn by the system, total power (apparent) delivered by the voltage source, Draw the phasor diagram of the voltage and current at the source.