Calculate the voltage, current and power readings, Electrical Engineering

Assignment Help:

Qestions:

a)  Draw the approximate equivalent circuit for a single phase power transformer. Identify all circuit elements and briefly explain their physical relevance.

b)  Short Circuit and Open Circuit tests have been conducted on a single-phase 19.2 kVA 480V/120V 50 Hz transformer, and the following values have been calculated from the results of these tests for the primary referred approximate equivalent circuit for this transformer:

 Req = 0.4 ω          Xeq = 0.88 ω          Ro = 512 ω                   Xo = 360

[i]  Calculate the voltage, current and power readings that would be expected from the open-circuit test on this transformer if the primary side was energised at rated voltage.

[ii] Calculate the voltage, current and power readings that would be expected from the short-circuit test on this transformer if the primary side was energised at rated current.

c)  The transformer of part (b) is supplied at rated primary voltage, and supplies a load current of 128A (measured on the secondary output side) with a lagging power factor of 0.866. Determine:

[i]   the secondary output voltage.

[ii]  The transformer efficiency.

d)  The tertiary, delta-connected winding in a Yy-connected three-phase transformer has a dual role.

Explain briefly the two reasons for its existence.


Related Discussions:- Calculate the voltage, current and power readings

Electrical and electronic principles, 12. A capacitor is to be constructed ...

12. A capacitor is to be constructed so that its capacitance is 0.2µF and to take a p.d. of 1.25kV across its terminals. The dielectric is to be mica which, after allowing a safety

What do these 8086 instructions do, What do these 8086 instructions do? ...

What do these 8086 instructions do? STD-Set  Direction Flag. when the instruction is implemented ,the direction flag of 8086 is set to 1. IRET-Interrupt Return. This instruc

Current relations in common emitter configuration, Q. What are the Current ...

Q. What are the Current relations in common emitter configuration? In a CB configuration Ie is the input current and Ic is the output current. These currents are relayed throug

Power system, recent trends in power system

recent trends in power system

What is the desirable properties of an insulation material, What is the des...

What is the desirable properties of an insulation material? Insulation materials have the desirable properties are as follows: 1. Very fine dielectric strength such as of mi

General equivalent circuits, What we have seen for practical power supplies...

What we have seen for practical power supplies applies to any  electrical circuit provided it contains only linear components

Pdc, disadvantages of shunt&series clippers

disadvantages of shunt&series clippers

Draw the impedance diagram of the system, The one line diagram of a simple ...

The one line diagram of a simple power system is shown below.  The data of the system are given in the table below.  (a) Draw the impedance diagram of the system and mark all im

Power plant, A power company is developing an upgrade to an existing power ...

A power company is developing an upgrade to an existing power plant and needs to make a requirements decision with respect to the maximum power output capacity for the upgrade. Thi

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd