TOPIC 3:TRANSMISSION PARAMETERS

• Resistance

• Inductance

• Capacitance

• Conductance

PARAMETERS OF

TRANSMISSION LINE

Resistance:

is the opposition of line conductors to the current flow

Resistivity (ρ):

• is the material property of the conductor

Resistivity (ρ):

It does not depend on the shape or size of the conductor but varies with temperature

Resistivity (ρ):

Uses a stranded conductor in transmission line. For stranded conductors, alternate layers of strands spirals in opposite directions

Cross Sectional Area (A);

the area of a circle that has the same radius as the wireinversely proportional to the resistance

Cross Sectional Area (A);

inversely proportional to the resistance

•  skin effect

The frequency of the AC voltage produces a second effect on the conductor resistance due to the nonuniform distribution of the current and it is called

Inductance:

• is a property of electrical conductors that describes how much they oppose changes in electric current

magnetic field:

• When a current flows through a conductor, a Magnetic field is created. The magnetic field generated follows any change in current

Electromotive Force (EMF):

From Faraday ’ s Law of induction, any change in magnetic field through a circuit induces an __ in the conductors

Inductance:

This tendency of an electrical conductor to oppose a change in electrical current flowing through it is called

Capacitor

• is a device consisting of two electrical conductors that are separated by a non conducting substance. Non conducting substance can be any insulator or even air

Capacitance:

• In transmission lines, we have conductors separated by air. This means that they act as capacitors. The effect of capacitor is also known as

Conductance:

is normally due to the leakage over the line insulator

Conductance:

 refers to the measure of how easily current can flow through the insulating material between the conductors