Q2. A small industrial user was fed from a 500 kVA, 11 kV/433 V transformer with a leakage impedanceof 4.75% and negligible resistance. He had a 400 kVA 6-pulse rectifier load and site measurements showedexcessive levels of harmonic distortion. The user had a 95 kVA power factor correction capacitor bank andthe harmonic measurements were carried out with and without this unit, at full load.A significant increase in distortion levels was detected with the PF correction capacitor bank in the circuit.Transformer and capacitor values indicated resonance at about 500 Hz. The difference between measuredlevels of harmonics with and without the PFC unit was greatest at the 11" harmonic.Calculate the resonant frequency and the THD with and without the power factor correction unit.

Answered: Image /qna-images/answer/981929f7-0df3-4aa5-8b38-272f6456adc1.jpg

Answered: Q2. A small industrial user was fed…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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In the full-wave rectifier circuit of figure, the transformer has a turns ratio of 1:2. The transformer primary winding is connected across an AC source of 230v (rms), 50 Hz. The load resistor is 50ohms. For this circuit, determine the peak-to- peak ripple in the output voltage * Di v: = VmSin ot Vs V. + Vy = VSin ot D2 Full-wave rectifier. Circuit operation during positive half cycle ell + ミ」
a. A 80 V rms is stepped down to 18V rms by a transformer. The output from the transformer is rectified using a half wave rectifier circuit and connected to a 47.5 2 load resistor. Draw a circuit diagram of this arrangement and the waveform at each stage.
A single-phase half wave uncontrolled rectifier circuit is operating with a purely inductive load and a source voltage of 100 sin (277t) V. An ideal PMMC ammeter is connected in series with the inductive load reads 20 A. Calculate the distortion factor of the rectifier. Answer Choices: a. 0.866 b. 0.707 c. 0.577 d. 0.816
Q5. For the following center tapped transformer, show the waveform across each half of the secondary winding and across Ri, when a 100 V peak sine wave is applied to the primarywinding. What is the PIV rating must the diode have? (Use constant voltage drop model for the Silicon diode) IN4001 Ry OV 10k) D IN4001
In the full-wave rectifier circuit of figure, the transformer has a turns ratio of 1:2. The transformer primary winding is connected across an AC source of 230V (rms), 50 Hz. The load resistor is 50ohms. For this circuit, determine the peak-to- peak ripple in the output voltage * Di i v2 = VmSin ot RL Vs(N V1 Vo + V3 = VmSin ot D2 Full-wave rectifier- Circuit operation during positive half cycle 460 V 207 V 325.3 V None of the above ell ell
Design a half-wave rectifier fed from 225-V line through a step-up transformer (5:8). The load requires an average voltage of 25 V and average power of 9 W. Use 15% safety factor.
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Design a bridge type full-wave rectifier fed from 220-V line through a step-down transformer (7:3). The load requires an average voltage of 17 V and average power of 9 W. Use a safety factor of 25%
Which of the following statements about bridge tip rectifiers is false? A) If the 1-phase type has source inductance, the average value of the output voltage is lower than in the absence of the inductance. B) The average output voltage value of the 1-phase type is 0.9 times the peak voltage of the network. C) none D) There are only odd harmonics in the current drawn by the 1-phase type from the mains. E) The average value of the output voltage of the 3-phase type is larger as the 3-phase and 1-phase types are compared
1) AC power in a load can be controlled by using a. Two SCR's in parallel opposition b. Two SCR's in series c. Three SCR's in series d. Four SCR's in series 2) The advantage of using free - wheeling diode in half controlled bridge converter is that a. There is always a path for the ac current independent of the ac line b. There is always a path for the dc current independent of the ac line c. There is always a path for the dc current dependent of the ac line d. There is always a path for the ac current dependent of the ac line 3) Silicon controlled rectifier can be turned on a. By applying a gate pulse and turned off only when current becomes zero b. And turned off by applying gate pulse c. By applying a gate pulse and turned off by removing the gate pulse d. By making current non zero and turned off by making current zero
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