Answered: At a 115kV substation the PT raatio is…

At a 115kV substation the PT raatio is 1000:1 and CT ratio is 1,200:5. The potential going into the wattmeter is 115V. What is the actual MW consumed when the wattmeter reads 736W hint: P=V*I

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter3: Determining The Required Number Of Branch Circuits, Lighting Outlets, And Receptacle Outlets

Section: Chapter Questions

Problem 6R: What is the unit load per square foot for dwelling units? See Table 220.12. __________

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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

At a 115kV substation the PT raatio is 1000:1 and CT ratio is 1,200:5. The potential going into the wattmeter is 115V. What is the actual MW consumed when the wattmeter reads 736W hint: P=V*I

Use four decimal places for final answer if necessary.

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