How to calculate the bus - bar voltage and kilowatt output., Electrical Engineering

Assignment Help:

Q. Two shunt wound generators running in parallel supply a total load current of 4000 A. Each generator has an armature resistance of 0.02? and a field of 40?. The fiels are excited so that the emf induced in one generator is 480 V and in another 490 V, find the bus - bar voltage and kilowatt output of each machine.

 

Sol.            V = bus bar voltage

 

                  I1 = current output of generator 1

 

                  I2 = current output of generator 2

 

             I1 + I2 =  4000

               Ish = V/Rsh

 

       Bus - bar voltage

 

       In each machine

 

       Bus bar voltage + voltage

 

       Drop in armature = EMF generated

 

       for  generated 1, E1 = V + Ia1 Ra

 

                 480 = V + (I1 + V/40) × 0.02

 

               (Ia1 = I1 + Ish)

 

      for  generated 2 490 =  V + (I2 + V/40) × 0.02

 

      Subtrating both with each other we get,

 

            0.0212 - 0.0211 = 10

 

  or      I2 - I1 = 500

 

  or      (4000 - I1) - I1 = 500

 

             I1 = 1750A and I2 = 4000 - 1750 = 2250A

 

Now          480 = V + (I1 + V/40) × 0.02    or      490 =  V + (I2 + V/40) × 0.02

 

                On solving V = 444.8 volts

 

           Kilowatt output

 

               kW output of gen. 1, VI1/1000 = 444.8 × 1750/1000 = 778.4kW

 

               kW output of gen. 2, VI1/1000 = 444.8 × 2250/1000 = 1001kW 


Related Discussions:- How to calculate the bus - bar voltage and kilowatt output.

Obtain complete solution for the current for given circuit, For the circuit...

For the circuit of Figure(a), obtain the complete solution for the current i L (t) through the 5-H inductor and the voltage v x (t) across the 6- resistor.

Calculate total internal resistance, One battery having of four cells, conn...

One battery having of four cells, connected in series. Emf of each cell is 1.45V and internal resistance of 0.04Ω. if a load resistance of 5Ω is connected to the battery, draw the

find the value of the slip and air gap power, The Thevenin equivalent circ...

The Thevenin equivalent circuit at the terminals of R2 / S for a 60 hz, 6 pole induction motor is shown below. a) Find the value of the slip for maximum torque and the maximum t

Hall effect experiment, Hall Effect experiment: Prob. Write short not...

Hall Effect experiment: Prob. Write short note on Hall Effect and its applications. What properties of a semiconductor are determined from a Hall Effect experiment? Sol.

Explain how materials can be classified in three groups, Explain how materi...

Explain how materials can be classified into three groups on the basis of atomic structure. An atom has a positively charged nucleus surrounded through a group of negatively ch

Dual trace and dual beam cro, what is difference between dual trace and dua...

what is difference between dual trace and dual beam cro?

Project, electrical project produse eneargy desingn

electrical project produse eneargy desingn

Transmission and swiching systems, using a combination of uniselectors and ...

using a combination of uniselectors and two motion selectors, draw a schematic of thousand line exchange and explain its working

#title.superposition theorem, .coments on the limitation of the superpositi...

.coments on the limitation of the superposition theorem

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