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Q2. A small industrial user was fed from a 500 kVA, 11 kV/433 V transformer with a leakage impedance of 4.75% and negligible resistance. He had a 400 kVA 6-pulse rectifier load and site measurements showed excessive levels of harmonic distortion. The user had a 95 kVA power factor correction capacitor bank and the 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 measured levels 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.

Q2. A small industrial user was fed from a 500 kVA, 11 kV/433 V transformer with a leakage impedance of 4.75% and negligible resistance. He had a 400 kVA 6-pulse rectifier load and site measurements showed excessive levels of harmonic distortion. The user had a 95 kVA power factor correction capacitor bank and the 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 measured levels 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.

Introductory Circuit Analysis (13th Edition)
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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Q2. A small industrial user was fed from a 500 kVA, 11 kV/433 V transformer with a leakage impedance of 4.75% and negligible resistance. He had a 400 kVA 6-pulse rectifier load and site measurements showed excessive levels of harmonic distortion. The user had a 95 kVA power factor correction capacitor bank and the 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 measured levels 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.
Transcribed Image Text:Q2. A small industrial user was fed from a 500 kVA, 11 kV/433 V transformer with a leakage impedance of 4.75% and negligible resistance. He had a 400 kVA 6-pulse rectifier load and site measurements showed excessive levels of harmonic distortion. The user had a 95 kVA power factor correction capacitor bank and the 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 measured levels 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.
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