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.

What are the main embedded system components, What are the main embedded sy...

What are the main embedded system components? Main Embedded System Components a. Embeds hardware to provide computer as functionalities b. Embeds major application softw

Multimeter probes, different types of probes used in multimeter

different types of probes used in multimeter

Details of a distribution transformer, Electrical network details: 1  ...

Electrical network details: 1          single line diagrams with conductor sizes, transformer locations, consumer location, lengths, capacitors, and load, etc., 2

Live human detection robot, which simulation software is better for this p...

which simulation software is better for this project, and how can i simulate it?

What is the purpose of carry flag and zero flag, What is the purpose of car...

What is the purpose of carry (c) flag and zero (z) flag? Carry flag conatins the carry after addition or borrow after subtraction. This carry flag also shows error conditions,

Meter field testing - sealing points, Meter Field Testing - Sealing Points ...

Meter Field Testing - Sealing Points The meter seal should be tamper proof. The consumer should be briefed about seals. The sealing of all metering systems should be completed

Biasing, Biasing: Bipolar transistor amplifiers have to be properly bi...

Biasing: Bipolar transistor amplifiers have to be properly biased to operate properly. In circuits made up with individual devices (discrete circuits), biasing networks contai

Systemic requirements - gis technology, Systemic Requirements: A robu...

Systemic Requirements: A robust GIS solution for a distribution utility comprises the subsequent: GIS application and database software should be OGC (Open Geospatial

Standby mode, Standby mode:In this mode, one processor is active and other ...

Standby mode:In this mode, one processor is active and other is on standby, both software and hardware wise. Standby processor brought online when active processor fails. A vital r

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