Ask Question, Ask an Expert


Ask Electrical & Electronics Expert

A three generator power supply system is connected to a bus network operating at a common voltage of 220 kV. The network is shown in first Figure below.

The neutral of each generator is grounded through ay'0.065 p.u. reactor. The generators are not loaded and are running at rated frequency and voltage. The system sequence impedance data on a common base of 220 kV and 100 MVA are given in Table Qla. A double line to ground fault occurs, between the phases detailed in Table second and ground, at the bus shown in first Figure, through a fault impedance ofy'0.085 p.u.. Assuming the prefault bus voltages as 1 p.u., find out

a) The 9x9 admittance matrices for the zero, positive and negative sequence circuits;

b) Zkk for each of the zero, positive and negative sequence, where k is the number of the bus on which the fault occurs.

c) The fault current;

d) The current delivered during the fault by the generator detailed in second Table ;

e) The voltage at the bus detailed in second Table during the fault; and

f) The current in the line detailed in second Table during the fault.

Software that may be used is Matlab, Mathematica or Excel.
The format of file names submitted is to be as follows:

"StudentName StudentNumber.file extension'

2107_Power system.jpg

Table: Power system parameters

1425_Power system parameters.jpg

               Fault       b) Generator       c) Bus d)       Inter bus
Name        phases    current               voltage         current
Bari           a, b           2                        1               5,6

Q2 A single phase transmission line consists of 5 conductors as shown Figure below.

1756_Transmission line.jpg

Conductors A1 to A3 are solid with a radius of 2.0 cm each and conductors B l and B2 are the return conductors, which are also solid, with a radius of 2.5 cm each.

A good approximation for the inductance of the circuit is given by

L=μ0/2π =ln GMD/GMRA0/2π InGMD/GMRB.

The inductance so find outd is predicated on equal current distribution in the A conductors and in the B conductors. Starting with Equation


find out a more accurate value for the inductance that does not rely on this assumption and hence find out the current distribution within each of the A and B conductors. State any assumptions made and the justification for the assumption.

The circuit is not transposed and the effects of earth may be neglected. The current may be assumed to be uniformly distributed throughout the conductor, i.e. skin and proximity effects may be neglected.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M91597

Have any Question? 

Related Questions in Electrical & Electronics

In a switch using the token bucket algorithm tokens are

In a switch using the token bucket algorithm, tokens are added to the bucket at a rate of r = 5 tokens/second. The capacity of the token bucket is c = 10. The switch has a buffer that can hold only eight packets (for the ...

1 implement a 3-to-8 decoder using not and and gates in

1. Implement a 3-to-8 decoder using NOT and AND gates in Logisim. Show that it is correct by showing it generates the same output as a 3-to-8 Decoder found in the Plexors menu of Logisim. 2. In Logisim, implement a 3-to- ...

1 define standing wave ratio swr what are the standing wave

1. Define standing wave ratio (SWR). What are the standing wave ratios for (a) an infinitely long line, (b) a short-circuited line, (c) an open-circuited line, and (d) a line terminated by its characteristic impedance? 2 ...

1 two point charges each of mass m and charge q are

1. Two point charges each of mass m and charge q are suspended by strings of length l from a common point. Find the value of q for which the angle made by the strings at the common point is 90°. 2. Point charges Q and ar ...

Assignmentpart 1 conductors1 a type tw cable containing two

Assignment: Part 1: Conductors 1. A type TW cable containing two No. 12 copper conductors has a maximum overcurrent protection of A. 15 A. B. 25 A. C. 30 A. D. 20 A. 2. Which one of the following types of wire can be use ...

Identify the variables associated with given problem and

Identify the variables associated with given Problem and find the dimensionless parameters. Problem The device in the schematic diagram below is a viscosity pump. It consists of a rotating drum inside of a stationary cas ...

1 discuss the consequence of the frequency dependence of

1. Discuss the consequence of the frequency dependence of the phase velocity of a wave in a material medium. 2. What is loss tangent? Discuss its significance. 3. What is the intrinsic impedance of a material medium? Wha ...

1 two immiscible fluids of different density and viscosity

1. Two immiscible fluids of different density and viscosity are flowing between two parallel plates. Express the boundary conditions at the interface between the two fluids. 2. Determine the velocity profile for fluid fl ...

In a real-time multimedia communication assume we have one

In a real-time multimedia communication, assume we have one sender and ten receivers. If the sender is sending multimedia data at 1 Mbps, how many RTCP packets can be sent by the sender and each receiver in a second? Ass ...

Through a series of tests on pipe flow h darcy derived an

Through a series of tests on pipe flow, H. Darcy derived an equation for the friction loss in pipe flow as in which f is a dimensionless coefficient that depends on (a) the average velocity v of the pipe flow; (b) the pi ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen