What is the effect of unsymmetrical spacing of conductors in a 3phase transmission line?

Unsymmetrical spacing of overhead line conductors give rise to unequal voltage in the individual phases at the receiving end even though the flow of current in each phases are same. This unequal voltage is due to difference in inductance of each phase conductor.

What is the purpose of transmission line transposition?

The basic definition for transposition of transmission line is to rotate the conductors which result in the conductor or a phase being moved to next physical location in a regular sequence. In electrical power transmission lines, the conductor arranges unequal space.

Why the transposition of conductors in a three phase transmission line is essential?

Transposition of line conductor in transmission line is essential to counter the unbalancing effects of irregular spacing of line connector. When the transmission line is more than 100 km long, then, as per electrical requirements three phases needed to be transposed.

When the conductors of a 3 phase transmission line are Unsymmetrically spaced and transposed it results in?

When conductors are unsymmetrically spaced in a 3-phase line, the flux linkage and inductance per phase are not identical, and knowing the inductance of each phase becomes complicated and it results in an unbalanced circuit.

What effect does a decrease in the phase spacing of conductors in a single phase or three phase overhead line have on the the inductance per phase?

Decreasing of distance between line phases leads to increasing of mutual capacitance (and mutual electromagnetic influence).

In which type of line transposition is done?

The transposition is mainly done in the switching station and the substations.

Why all overhead lines use ACSR conductors?

Aluminium conductor steel-reinforced cable (ACSR) is a type of high-capacity, high-strength stranded conductor typically used in overhead power lines. The outer strands are high-purity aluminium, chosen for its good conductivity, low weight, low cost, resistance to corrosion and decent mechanical stress resistance.

How capacitance is formed in transmission line?

Capacitance in a transmission line results due to the potential difference between the conductors. The conductors get charged in the same way as the parallel plates of a capacitor. Capacitance between two parallel conductors depends on the size and the spacing between the conductors.

How do they impact in increasing and decreasing with lengths of transmission lines?

For higher lengths of lines takes place higher charging reactive power (VAr-s) conditioned by capacitance between phases and earth. Increasing of length leads to decreasing of line’s conductivity.

What is meant by transposition of transmission line?

When the high voltage applied capacitance created between the conductors and conductor and ground. transposition of transmission line are used to transpose the phase conductors in three sections in such a way that each phase by rotation occupies each of the three phase positions in a circuit.

Why transposition arrangement of high voltage lines is important?

The transposition arrangement of high voltage lines also helps to reduce the system power loss. In addition to this, we have developed Transposition System for Single circuit tower using same tension tower with reduced deviation angle. Transposition arrangement of power line also helps to reduce the effect of inductive coupling.

Why are voltage drops in transmission lines not the same everywhere?

So the voltage drops are not same as one place to another. To eliminate this effect can simply do by interchange the conductor position which is known as transposition. When the transmission line is more than 100 km long, then, as per electrical requirements three phases needed to be transposed.

How to show the transposition arrangement of the conductor?

The transposition arrangement of the conductor can simply show in the following the figure. The conductor in Position 1, Position 2 and Position 3 changes in a specific arrangement to reduce the effect of capacitance and the electrostatic unbalanced voltages.