Learning PortalReports -e-Services -Academic DepartmentsETC -CIMSCourses -In the balanced three phase power measurement using two wattmeter method, each wattmeter reads 22 kW when the pf is unity. What does each wattmeterreads when the pf falls to () 0.866 lag and (i) 0.906 lag. The total three-phase power remains unchanged.O W1 at 0.866 lag) W2 at 0.866 lag(1) W1 at 0.906 lag(1) W2 at 0.906 lagA 4000 V / 230 V 50HZ single-phase transformer is to have an approximate emf per turn of 10 V and cross sectional area of 330 cm². Calculate (a) the numberof primary turns (b) number of secondary turns (c) maximum value of flux anc (d) the maximum value of flux densityNumber of turns in PrimaryNumber of turns in SecondaryMaximum value of fluxMaximum value of flux density

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In the balanced three phase power measurement using two wattmeter method, each wattmeter reads 22 kW, when the pf is unity. What does each wattmeter reads when the pf falls to (0 0.866 lag and (i) 0.906 lag. The total three-phase power remains unchanged. O W1 at 0.866 lag (O W2 at 0.866 lag (1) W1 at 0.906 lag (1) W2 at 0.906 lag

In the balanced three phase power measurement using two wattmeter method, each wattmeter reads 22 kW, when the pf is unity. What does each wattmeter reads when the pf falls to (0 0.866 lag and (i) 0.906 lag. The total three-phase power remains unchanged. O W1 at 0.866 lag (O W2 at 0.866 lag (1) W1 at 0.906 lag (1) W2 at 0.906 lag

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.23P: A single-phase source has a terminal voltage V=1200volts and a currentI=1530, which leaves the...

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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.

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In the balanced three phase power measurement using two wattmeter method, each wattmeter reads 22 kW when the pf is unity. What does each wattmeter
reads when the pf falls to () 0.866 lag and (i) 0.906 lag. The total three-phase power remains unchanged.
O W1 at 0.866 lag
) W2 at 0.866 lag
(1) W1 at 0.906 lag
(1) W2 at 0.906 lag
A 4000 V / 230 V 50HZ single-phase transformer is to have an approximate emf per turn of 10 V and cross sectional area of 330 cm². Calculate (a) the number
of primary turns (b) number of secondary turns (c) maximum value of flux anc (d) the maximum value of flux density
Number of turns in Primary
Number of turns in Secondary
Maximum value of flux
Maximum value of flux density

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