Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Physics Expert

Sketch per-phase equivalent circuit of power system, find excitation on the generator and short circuit current.

A 3-phase synchronous generator is connected to a step-up transformer T1, which is connected to a 60km long transmission line.  As far end of the line, a step-down transformer bank T2 is connected.  The secondary of T2 supplies two loads L1 and L2.

The ratings for the various parts of system are as follows:

Generator

10 MVA, 12kV,  X = 20%, star connected

T1

5 MVA, 12/69 kV, X = 10%

T2

5 MVA, 69/4.16 kV, X=10%

L1

2000 kVA at 0.8 pf lagging

L2

1000 kVA at 0.75 pf lagging

Transmission Line

X = 0.5 W/km  (R is negligible)

A.      Draw per-phase equivalent circuit of the power system showing all reactances in per unit and show the base voltages used at various parts of the network.  Use 10 MVA and 12 kV as base quantities in the generator circuit.

B.      If the voltage on the load bus bar has to be maintained at 4.16 kV, find the required excitation on the generator.

C.      For this excitation, establish the short circuit current (in amperes) when a three-phase fault occurs on the secondary winding of transformer T2.

Physics, Academics

  • Category:- Physics
  • Reference No.:- M918004

Have any Question? 


Related Questions in Physics

See if you can prove that k-means always converges hint

See if you can prove that K-means always converges. [Hint: find a physical analogy and an associated Lyapunov function.] [A Lyapunov function is a function of the state of the algorithm that decreases whenever the state ...

At 20ccelsius a sphere of iron has a diameter of 25545cm

At 20C(Celsius) a sphere of iron has a diameter of 2.5545cm and a sphere of brass has a diameter of 2.5507cm. (a) What will be the diameter of each at 50C? (b) At what temperature will the two sphere have identical volum ...

A electron mass m1 911 x 10-31 kg and a proton mass m2

An electron (mass m1 = 9.11 x 10-31 kg) and a proton (mass m 2 = 1.67 x10 -27 kg) attract each other via an electrical force. Suppose that an electron and a proton are released from rest with an initial separation d = 3. ...

1 find the equations of the tangent lines at x 2 to the

1. Find the equations of the tangent lines at x = 2 to the ellipse 2. Find the equation of the tangent line to the curve y = x 2 at x = 1. Show that this line is also a tangent to a circle centered at (8, 0) and find the ...

1 sketch the graph of the height of a particle against time

1. Sketch the graph of the height of a particle against time if velocity is positive and acceleration is negative. 2. The position of a particle moving along the x-axis is given by s(t)=5t 2 + 3. Use difference quotients ...

On the surface of planet mars the acceleration of gravity

On the surface of planet Mars the acceleration of gravity is estimated as g = 3.7 m/s2. Find the potential energy of a 7 kg stone at the height of 8 m above Mars' surface.

What is the increase in entropy when one gram of ice at

What is the increase in entropy when one gram of ice at 0° C is melted and heated to water vapor at 500° C?

In low-speed incompressible flow the peak pressure

In low-speed incompressible flow, the peak pressure coefficient (at the minimum pressure point) on an aerofoil is 0.41. Estimate the critical Mach number for this airfoil, using the Prandtl-Glauert Rule.

1 the practical depth limit for a suited diver is about 185

1. The practical depth limit for a suited diver is about 185 m. What is the gage pressure in sea water at that depth? The specific gravity of sea water is 1.025. 2. Matter is attracted to the center of Earth with a force ...

1 sketch to scale the longitudinal and transverse

1. Sketch to scale the longitudinal and transverse displacement waves on a monoatomic one-dimensional lattice at a wavelength of λ-4a. Locate the vibration frequency of these two acoustical modes on the ω q  -q diagram s ...

  • 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