A factory takes a steady load of 0.22 MW at a 82% lagging (pf). The tariff is Rp 18000 per kVA of maximum demand per anmim plus Rp 10 per kWh. The phase advancing plant costs Rp 92000 per kVAR and the anmual interest and depreciation together amount to 0.15. Find: (i) the value to which the power factor be improved so that anmual expenditure is minimum (ii) the capacity of the phase advancing plant (iii) the new bill for energy, if the factory works for 4800 hours per annum.

A factory takes a steady load of 0.22 MW at a 82% lagging (pf). The tariff is Rp 18000 per kVA of maximum demand per anmim plus Rp 10 per kWh. The phase advancing plant costs Rp 92000 per kVAR and the anmual interest and depreciation together amount to 0.15. Find: (i) the value to which the power factor be improved so that anmual expenditure is minimum (ii) the capacity of the phase advancing plant (iii) the new bill for energy, if the factory works for 4800 hours per annum.

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

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

Question

A factory takes a steady load of 0.22 MW at a 82% lagging (pf). The tariff is Rp 18000 per kVA of maximum demand per annum plus Rp 10 per kWh. The phase advancing plant costs Rp 92000 per kVAR and the annual interest and depreciation together amount to 0.15.

Find:
(i) the value to which the power factor be improved so that annual expenditure is minimum
(ii) the capacity of the phase advancing plant
(iii) the new bill for energy, if the factory works for 4800 hours per annum.

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