Unit II Modeling and Performance of Transmission Lines
Classification of lines: Short line, medium line and long
line; equivalent circuits,
Attenuation constant, phase constant, surge
impedance;
transmission efficiency and voltage regulation;
real and
STRUCTURE OF ELECTRIC POWER
SYSTEM
Generation ,Transmission,Distribution
3 ph,3 wire a.c system GEN,TRN of ele power
3ph,4 wire a.c system Disbn of ele power
under gnd systemexpensive
Overhead systemmostly adopted in our
country.
Transmission and
Skin effect
When a conductor is carrying steady state direct
current (D.C), this current is uniformly distributed
over the whole Xsection of the conductor.
However, an alternating current flowing through
the conductor does not distribute uniformly,
rat
Unit I Transmission Line Parameters:syllabus
Parameters of single and three phase transmission lines
with single and double circuits:
Resistance, inductance and capacitance of solid, stranded
and bundled conductors:
Symmetrical and unsymmetrical spacin
Jan
th
28
2015
Calculation of time and energy loss in
transient operations
Calculation of time and energy loss in transient
operations
Transient operations
Starting, braking, speed change and speed
reversal are transient operations.
Time taken and energ
January 23rd
Component of load torques(Tl)
Friction torque
Friction Torque (TF): Friction will be present at
the motor shaft and also in various parts of
the load.
The friction torque (TF) is the equivalent value
of various friction torques referred to
February 6th
Load Equalization
Load Equalization Introduction
In pressing machines, a large torque of short
duration is required during pressing operation,
otherwise the torque is nearly zero.
Other examples are Electric Hammer, steel rolling
mills and
February
th
11
Recapload equalization
The method of equalizing the load is known as
load equalization and results in smoothening
out the fluctuating loads.
This requires storing of energy during light
loads which can be made to give out during
the peak
February
th
4
Steady state stability
Condition for equilibrium point to be
stable
An equilibrium point will be stable when an
increase in speed causes load torque to
exceed the motor torque.
When at equilibrium point following condition
is satisfied.
Pr
February 16th
Thermal modeling
Substituting the value of p2 in (1) and rearranging
equations,
Whd/dt=p1dA (3)
C=Wh
D=dA
C Thermal capacity of the machine in
watts/degree centigrade
Dthe heat dissipation constant in watts/degree
centigrade
Cd/dt
Converter fed dc motor drives
9th March 2015
Prepared By Sreedevi.V.T/VIT CHENNAI
Syllabus
Single and three phase controlled converter
fed separately excited DC motor drive
Prepared By Sreedevi.V.T/VIT CHENNAI
Syllabus
Steady state analysis and problem
Electrical Braking February
20th
Introduction
In braking, the motor works as a generator developing
a negative torque which opposes the motion.
Many modern electric drive vehicles including electric
locomotives and HEVs have regenerative braking
systems
Elevators and lifts
Lift system description
PREPARED BY SREEDEVI.V.T,
VIT UNIVERSITY
2/24/2015
Introduction
Historically, lift systems were operated using
motor generator sets and WardLeonard
multimotor control.
With the development of drive technology
Jan 21st
Fundamental torque equation
Motor drives a load through a transmission
system.
Motor always rotate, load may rotate or undergo
a translational motion.
Load speed may be different from that of motor.
Fundamental torque equation
The basic equat
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Practical feedback control systems are often reqllired to satisfy design specification in u1e
transient as well as steady state regions.
This is
D.C, POSITION CONTROL
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OBJECT
To
study
the
performance
characteristics
of a d.c.
motor
angular
position
control
system.
2. EQUIPMENT
A major
portion
the study
of d.c. position
around
been
confined
similar
and
DESCRIPTION
to analog
other
near
units.
A
LINEAR SYSTEM SIMULATOR
1. OBJECT
,
To study the time response of a variety of simulated
studies 'with theoretical results.
2. EQUIPMENT
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DESCRIPTION
The present set up has been designed to provide a convenient means of ver
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D.C. SPEED CONTROL
1. OBJECT
To study the performance
characteristics
of a d.c. motor speed control system.
2. EQUIPMENT DESCRIPTION
Speed control is a very common requirement in many industrial applications such as
rolling mills, spinning mills, p
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TEMPERATURE CONTROL SYSTEM
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LABORATORY
INSTRUCTION
MANUAL
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TEMPERATURE
CONTROL SYSTEM
1. OBJECT
To study the perfonnance
temperature of an oven.
of various types of controllers
used to control the
2. SY
3/29/2010
CTM Example: Frequency Design Metho
Example: Frequency Design Method for DC Motor
Speed Control
Drawing the original Bode plot
Adding proportional gain
Plotting the closedloop response
Adding a lag controller
From the main problem, the dynamic
3/29/2010
CTM Example: PID Design Method for D
Example: PID Design Method for DC Motor Speed
Control
Proportional control
PID control
Tuning the gains
From the main problem, the dynamic equations and the openloop transfer function of the DC Motor are:
an
3/29/2010
CTM Example: Root Locus Design Meth
Example: Root Locus Design Method for DC Motor
Speed Control
Drawing the openloop root locus
Finding the gain using the rlocfind command
Adding a lag controller
Plotting the closedloop response
From the main
8/2/2010
CTM Example: Frequency Design Meth
Example: Frequency Design Method for DC Motor
Speed Control
Drawing the original Bode plot
Adding proportional gain
Plotting the closedloop response
Adding a lag controller
From the main problem, the dynamic eq