current - 1=?, and the power factor - cosp =?.4.An out of balance three phase star connected load has the following complex currents:I₁ = lejº,A, I₂ =le¯6⁰,A and I₁=1e¹j6⁰, A. This load is supplied by a four wirepower line from a balance voltage source. Find the r.m.s. value of the neutral current Io =?Waitto th The total resistance of a series wound DC motor is ER*=0.52. This machine has anelectromagnetic constant of CEM=1.85. When this motor is supplied by a DC voltage sourceof UM-200V and is loaded, it takes current of I=30A and operates with magnetic flux ofp=0.1 Wb. If its additional power losses are 4PAD=100W, and its iron power losses in thearmature are 4PIR(a)=50W find: the induced e.m.f. in the armature winding - Ea=?, therevolution speed at this load n=?, and the efficiency at this load n =?

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4. An out of balance three phase star connected load has the following complex currents: I₁ = le¹j⁰, A, I₂ =le¯j60° ,A and I₂ =1e¹j6⁰, A. This load is supplied by a four wire power line from a balance voltage source. Find the r.m.s. value of the neutral current Io =?

4. An out of balance three phase star connected load has the following complex currents: I₁ = le¹j⁰, A, I₂ =le¯j60° ,A and I₂ =1e¹j6⁰, A. This load is supplied by a four wire power line from a balance voltage source. Find the r.m.s. value of the neutral current Io =?

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 2.16P: A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and...

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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

current - 1=?, and the power factor - cosp =?.
4.
An out of balance three phase star connected load has the following complex currents:
I₁ = lejº,A, I₂ =le¯6⁰,A and I₁=1e¹j6⁰, A. This load is supplied by a four wire
power line from a balance voltage source. Find the r.m.s. value of the neutral current Io =?
Wait
to th

The total resistance of a series wound DC motor is ER*=0.52. This machine has an
electromagnetic constant of CEM=1.85. When this motor is supplied by a DC voltage source
of UM-200V and is loaded, it takes current of I=30A and operates with magnetic flux of
p=0.1 Wb. If its additional power losses are 4PAD=100W, and its iron power losses in the
armature are 4PIR(a)=50W find: the induced e.m.f. in the armature winding - Ea=?, the
revolution speed at this load n=?, and the efficiency at this load n =?

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