Transformers, Electrical Engineering

Assignment Help:

Three transformers are provided with the following rating values:

1) 2400/240 V, 55kVA, Req1 = (0.1 + 0.0Y) Ohm and Xeq1 = (0.15 + 0.XX) Ohm.

2) 240/120 V, 25kVA, Req1 = (0.15 + 0.0Y) Ohm and Xeq1 = (0.30 + 0.XX) Ohm.

3) 240/120 V, 20kVA, Req1 = (0.20 + 0.0Y) Ohm and Xeq1 = (0.40 + 0.XX) Ohm.

All impedances are referred to the 240 V side. Transformer no. 1 can be operated as an autotransformer (Notice; the equivalent impedance as an autotransformer is calculated by dividing the original impedance over the turn's ratio of the autotransformer).

A 240 V, 60 kW, 0.9 power factor lagging load is to be supplied by the above transformers. The load will be connected for one full week, and the energy cost is 0.10 SR / kWh. As it can be observed, the load has to be supplied by a combination of the transformers. Assume that both 2640 V and 120 V supplies are available.

Determine the best design (best combination) to supply the load so that the operating cost is minimum. Show all the steps in your calculation.

Note:

 "XX" is the 7th and 8th digit of student ID, like (200891XX0).

"Y" is your section number (e.g., 01, 02).


Related Discussions:- Transformers

History - field-effect transistor, History - Field-Effect Transistor: ...

History - Field-Effect Transistor: The principle of field-effect transistors was very first patented by Julius Edgar Lilienfeld in the year 1925 and by Oskar Heil in the year

Define abcd propagation , ABCD propagation of an optical ray through a s...

ABCD propagation of an optical ray through a system can be described by a straightforward two by two  matrix. In ray optics, the feature of a system is known by the correspondin

Change management in power distribution, Change Management in Power Distrib...

Change Management in Power Distribution: Organisational change might be described as an organisation-wide effort to augment the effectiveness of an organisation through str

Explain the asynchronous decade counter, Explain the Asynchronous Decade Co...

Explain the Asynchronous Decade Counter? The binary counters earlier introduced have two to the power n states. But the counters with states less than this number are as well

UJT Help, What''s the formula for the VB2'' in a UJT?

What''s the formula for the VB2'' in a UJT?

#speed control, explain speed control of dc motor

explain speed control of dc motor

Show advantages of oscillators, Q. Show Advantages of Oscillators? Alth...

Q. Show Advantages of Oscillators? Although oscillations can be produced by mechanical devices (e.g. alternators), but electronic oscillators have the following advantages:

Differentiate between an integrator and differentiator, Q . Differentiate b...

Q . Differentiate between an integrator and differentiator? Integrators 1 Integrators are circuits in which output voltage is proportional to the integral of the input.

Installed in circuit board, Can we measure the resistor if it is installed ...

Can we measure the resistor if it is installed in circuit board? Ans) You can calculate a resistor in a circuit but the circuit will most likely affect the value read (general

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