At a 12.47 kV (line to line) distribution system the communication interference (CI) was observed due to 5% of 5th harmonic currents generated by a 3000 kVA arc furnace. In order to avoid CI it is required to convert an existing 600 KVAR capacitor to 5th harmonic filter considering the total kVAr should not exceed 135%. Calculate the following: (i) Capacitor reactance (ii) Reactance of the series reactor (iii) Fundamental frequency current (iv) 5th harmonic frequency current (v) Tuned frequency voltage (vi) Total rms current (vii) Fundamental frequency voltage (viii) Voltage (rms) across the capacitor bank (ix) Check whether the filter kVAr rating is within limit? (x) Comment how the existing capacitor bank is converted to filter

At a 12.47 kV (line to line) distribution system the communication interference (CI) was observed due to 5% of 5th harmonic currents generated by a 3000 kVA arc furnace. In order to avoid CI it is required to convert an existing 600 KVAR capacitor to 5th harmonic filter considering the total kVAr should not exceed 135%. Calculate the following: (i) Capacitor reactance (ii) Reactance of the series reactor (iii) Fundamental frequency current (iv) 5th harmonic frequency current (v) Tuned frequency voltage (vi) Total rms current (vii) Fundamental frequency voltage (viii) Voltage (rms) across the capacitor bank (ix) Check whether the filter kVAr rating is within limit? (x) Comment how the existing capacitor bank is converted to filter

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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Concept explainers

Compensation Techniques

The compensation techniques are the methods that are employed in the electrical control systems to enhance the performance of the system. The performance are generally affected by the factors like lag in the compensating devices, slow response of the system of the components like sensors used in the control system. The basic compensation technique involves lag compensation, lead compensation or the combination of the both.

Question

At a 12.47 kV (line to line) distribution system the
communication interference (CI) was observed due to 5% of 5th
harmonic currents generated by a 3000 kVA arc furnace. In order
to avoid CI it is required to convert an existing 600 KVAR
capacitor to 5th harmonic filter considering the total kVAr should
not exceed 135%. Calculate the following:
(i) Capacitor reactance
(ii) Reactance of the series reactor
(iii) Fundamental frequency current
(iv) 5th harmonic frequency current
(v) Tuned frequency voltage
(vi) Total rms current
(vii) Fundamental frequency voltage
(viii) Voltage (rms) across the capacitor bank
(ix) Check whether the filter kVAr rating is within limit?
(x) Comment how the existing capacitor bank is converted
to filter

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