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).

Posted Date: 2/20/2013 1:07:03 AM | Location : United States

Ask an Expert

Related Discussions:- Transformers, Assignment Help, Ask Question on Transformers, Get Answer, Expert's Help, Transformers Discussions

Write discussion on Transformers
Your posts are moderated

Write your message here..

Related Questions

Write explanatory notes on 8284 clock generator, Write explanatory notes on... Write explanatory notes on 8284 Clock generator. The 8284 is an ancillary element to the microprocessors. Without this clock generator, a few additional circuits are needed to

Explain in brief the functions of clock generator chip, Explain in brief th... Explain in brief the functions of the clock generator chip, 8284. 8284 Clock generator: The 8284 is an ancillary element to the microprocessors. Without any clock generato

Torque slip characteristics, all about ans in this topic all about ans in this topic

Ferromagnatic transformer, uses of ferromagnatic transformer uses of ferromagnatic transformer

Energy stored in a switched inductor, The increase in the current is buildi... The increase in the current is building up the magnetic field surrounding the coil. Energy is stored in that field. Consider the energy supplied by the voltage source during the

Purpose of compensation and space charge neutrality, My question about abov... My question about above topic is"what is the use of the of this process" why we do compensation and space charge carrier

Compute the signal-to-noise ratio, Q. (a) An ampli?er with F 0 = 3 or 4.77... Q. (a) An ampli?er with F 0 = 3 or 4.77 dB, f 0 = 4 GHz, and BN = 14 MHz is used with an antenna forwhich T a =200K. The connecting path loss is 1.45, or 1.61 dB at a physical t

Effective mass, Effective Mass The electrons' "wave-particle" motio... Effective Mass The electrons' "wave-particle" motion in a lattice is not the same as that for a free electron, because of the interaction with the periodic potential of the

Determine the complete response for capacitance, Consider the circuit of Fi... Consider the circuit of Figure for t> 0 with zero initial conditions, v Th (t) = 1 V (dc), and R Th = 2 ; L = 1 H. Determine the complete response for vC(t) for capacitance value

Comparison with vacuum tubes, Comparison with vacuum tubes: Prior to t... Comparison with vacuum tubes: Prior to the growth of transistors, vacuum (electron) tubes (or in the UK (United Kingdom) "thermionic valves" or just "valves") were the major a