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Assume that the voltage drop across the resistor,
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Delmar's Standard Textbook Of Electricity
- For a 152 kV, 60 Hz system, the capacitance up to the location of the circuit breaker is 0.020 micro Farad and the frequency of oscillation is 15 kHz respectively. Calculate the following : (i) inductive reactance of the line (ii) The maximum value of restriking voltage across the contacts of the circuit breaker. (iii) The maximum value of RRRV. ( expected time 10 minutes)arrow_forwardA 3-phase overhead transmission line is being supported by three disc insulators. The potentials across top unit and middle unit are 9 kV and 11 kV respectively. Calculate: a. The ratio of capacitance between pin and earth to the self-capacitance of each unit. b. The line voltage. c. String efficiency. JAns: a. 0.22 b. 35.444 kV c. 76%]arrow_forwardA series circuit composed of a resistance of 24 ohms, an inductance of 0.09 henry and a capacitance of 8 microfarad, is connected to a 120-volt 50-Hz supply. Calculate (a) the line current, (b) impedance of the circuit, (c) voltage drop, (d) total reactive power, (e) power factor.arrow_forward
- A single phase full wave AC voltage controller has an inductive load with R=5 Ohms and L=13 mH. The input voltage is 240V (RMS), 50 Hz and the delay angles of both thyristors are equal to 30 degrees. The thyristor T1 is turned off at 200 degrees. The load magnitude is 6.46 Ohms, its angle theta is 39.24 deg and the frequency w is equal to 314.59 rad/s. The average thyristor current Ia is equal to: (you need to integrate the instantaneous current) Select one: a. 36 A b. 16A c. 26A d. None of thesearrow_forwardThree conductors of a 3-phase overhead line are arranged in a horizontal plane 6 m apart. The diameter of each conductor is 1·24 cm. Find the capacitance of each conductor to neutral per 100 km of the line. [0·785 μF]arrow_forwardPlease answer quickly "In series-connected ac circuit, the total voltage across the circuit is always equal to the sum of the magnitude (only) of the individual voltage across each element." True False The power factor is equal to cosine of the phase difference. True False A leading power factor means that the circuit is predominantly capacitive in nature. True False "Since most loads are resistive in nature (e.g. motors), improvement of power factor is done by connecting capacitor banks or a synchronous condenser " True Falsearrow_forward
- In a 132 kV, 3-phase, power system, the line to ground capacitance is 0.04 μF and the inductance is 9.0 H. Calculate(1) Voltage appearing across the circuit breaker pole when a magnetizing current of 10 A (instantaneous value) is interrupted.(2) Resistance to be connected across the contacts to eliminate the restriking voltagearrow_forwardThe total kVA rating of capacitors required to raise the full-load power factor of a 3-phase, 440 V, 50 Hz induction motor from 0.75 to 0.85 lagging is Qc = 15 KVAR. Capacitors are delta connected. (i) Determine the line current drawn by the capacitor bank (ii) Determine the phase current of the capacitor bank (iii) Determine the capacitive reactance per phase Xc (iv) What will be the capacitance per phase if the capacitors are delta connected ?arrow_forwardS.4) the length of a three-phase power transmission line with a Nominal operating voltage of 69 kV is 16km. The impedance of the transmission line per unit length is 0.125 + j0.4375 ohm/km. From the end of the line, a 56 MW star connected load is fed with a power coefficient of 0.8 back under a 64 kV interphase voltage. If the line head voltage of the transmission line is 69 kV, calculate the capacity and power of the star-connected capacitor to be shunted into the load connected to the end of the line.arrow_forward
- COURSE: Electrical EngineeringSUBJECT: Electrical ApparatusINSTRUCTIONS:• Write the GIVEN with their respective symbols and units.• Do not skip the SOLUTIONS, do it step-by-step with their respective symbols and units• Round up to 3 three decimal places the FINAL ANSWERS and BOX it. PROBLEM: A source delivers 50 kVA to a load with a power factor of 65 percent lagging. Find the load’s average and reactive powers.arrow_forwardA three-phase 150 kVA, 4160 V, 0.8 lagging pf load is to be supplied by three single-phase transformers having a turns ratio of 2. Calculate the current that flows in the primary windings if the transformers are connected delta-delta. Subject: Electrical Apparatus and Divices BOX THE FINAL ANSWERarrow_forwardAC electrical circuit is below: (refer picture below) a. Determine the current flowing in the load. b. If it is desired that the system power factor be 0.9. With system frequency = 50 Hz. Determine how large the capacitor is must be installed? Which one is correct? A/B/others answer A. C = 7.7015 mF B. C = 35.243 µF c. Please Draw all the phasor. Please give complete, details, and correct answer. Please do step by step, draw the phasor Please using handwriting (not typing ). THANK YOU, I WILL GIVE MANY THUMBS UP.arrow_forward
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