Part 4 Flashcards
Parameters of Transmission Line
Resistance
Inductance
Capacitance
Conductance
is the opposition of line conductors to the
current flow
RESISTANCE
is the material property of the conductor.
does not depend on the shape or size of the conductor
Varies with temperature
Uses a stranded conductor in transmission line
Resistivity
Length of the line used
Length
Area of a circle that has the same radius as the wire
Inversely proportional to the resistance (based from the formula R = pL/A)
Cross sectional Area
The frequency of the AC voltage produces
a second effect on the conductor resistance due to the
nonuniform distribution of the current
Frequency effect and also called as skin effect
As frequency increases, the current tends to _______ and the current density ______
Go toward the surface of the conductor, decreases at the center
Skin effect _________ used by the current and thus the effective resistance _________
Reduces the effective cross section area, increases
Formula for resistance of a line
R = pL/A where p denotes the resistivity of the conducting material
A denotes the cross sectional area of the transmission line
L denotes the length of the transmission
property of electrical conductors that
describes how much they oppose changes in electric current.
Inductance
When a current flows through a conductor, a _____ is created. The ________ generated follows any change in current
Magnetic field
From Faraday’s Law of induction, any change in magnetic
field through a circuit induces an ______
Electromotive Force (EMF)
in the conductors.
The induced voltage has the effect of
opposing the change in current. This tendency of an
electrical conductor to oppose a change in electrical current
flowing through it is called…..
Inductance
When designing the space between conductors, it is important to consider the
Inductance
device consisting of two electrical
conductors that are separated by a non conducting
substance.
Capacitor
Non conducting substance can be _______
Any insulator or even air
In transmission lines, we have conductors separated by air.
This means that they act as ______ and the effect of capacitor is also known as ________
Capacitors, capacitance
Normally due to the leakage over the line insulator
Conductance
In a transmission line, this refers to the measure of how easily current can flow through the insulating
material between the conductors
Conductance
Propoerties of a conductor that are connected in series
Resistance and inductance
Properties of dielectric material or insulators between conductors that are considered to be shunt elements
Capacitance and conductance
Parameters specifically resistance, inductance, conductance and capacitance are __________ along the whole length of the line
Uniformly distributed
It is always neglected in overhead transmission lines
Shunt conductance
Unit of resistance
Ohm
