4. A balanced Y-connected 400V voltage source is applied to two balanced loads in parallel, where Z, = 20 - j40 and Z2 = 3+ j45 Ohms and Z, is Y-connected and Z2 is A- connected. Using base values of Spase 3-phase calculate the source current in per unit. %3D 10KVA and Vbase L-N = 100V,

4. A balanced Y-connected 400V voltage source is applied to two balanced loads in parallel, where Z, = 20 - j40 and Z2 = 3+ j45 Ohms and Z, is Y-connected and Z2 is A- connected. Using base values of Spase 3-phase calculate the source current in per unit. %3D 10KVA and Vbase L-N = 100V,

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

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.22P: A balanced Y-connected voltage source with Eag=2770volts is applied to a balanced-Y load in parallel...

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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

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4. A balanced Y-connected 400V voltage source is applied to two balanced loads in parallel
where Z, =
20 - j40 and Z2 = 3+ j45 Ohms and Z, is Y-connected and Z2 is A-
connected. Using base values of Spase 3-phase = 10KA and Vase L-N = 100V,
calculate the source current in per unit.

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