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

Less distances between components of split phase conductors correspond to higher inductance. Alike this increasing of distances between line’s phases leads to decreasing of line’s inductance. Decreasing of distance between line phases leads to increasing of mutual capacitance (and mutual electromagnetic influence).

What happens if the radius of the three phases of the transmission line conductors is increased?

If the diameter of the conductor is increased, radius will increase and inductance is decreased. Proximity effect occurs due to current in mutual conductors. Accumulation of current on the surface of the conductor is called skin effect. Due to skin effect the area of current flowing path is reduced.

What is the effect of unsymmetrical spacing?

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 effect of inductance is the distance between the terms increases?

By increasing the spacing between conductors in a transmission line, inductance will increase. This is because there will be lesser cancellation of fluxes produced by the two conductors.

What is the effect on corona if the spacing between the conductors is increased *?

By increasing the spacing between conductors, the voltage at which corona occurs is raised and hence corona effects can be eliminated.

What is the effect of capacitance 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 inductance and capacitance of a transmission lines are affected by the spacing between the conductors?

Detailed Solution. The spacing between the conductors in an overhead line is directly proportional to inductance and inversely proportional to capacitance. Hence as spacing of overhead line is increase, the line capacitance decreases but line inductance increases.

What is the effect of earth on the capacitance of the line?

Earth affects the calculation of capacitance of three-phase lines as its presence alters the electric field lines. Usually the height of the conductors placed on transmission towers is much larger than the spacing between the conductors.

What is meant by symmetrical spacing?

* Symmetrical Spacing : If the three conductors A, B and C are placed symmetrically at the corners of an equilateral triangle of side d, then d1= d2= d3 =d. * Asymmetrical Spacing : When 3phase line conductors are not equidistant from each other, the conductor spacing is said to be unsymmetrical.

What is transposition transmission line?

Transposition is the periodic swapping of positions of the conductors of a transmission line, in order to reduce crosstalk and otherwise improve transmission. Transposition also equalizes their impedance relative to the ground, thus avoiding one-sided loads in three-phase electric power systems.

What is the effect of unsymmetrical spacing between three phase conductors?

The flux linkage of each phase conductors for unsymmetrical spacing are not same. Due to this the inductance of the three phase conductors will be different. Because of this, there will be unequal voltage drop in the three phases even though the currents in phase conductors are balanced.

Why is the inductance of 3 phase line conductors the same?

As the conductors are symmetrically spaced from each other therefore the flux linkage of each conductor will be same. Due to this, the inductance of each phase conductor will be same. Therefore for symmetrical spacing of 3-phase line conductors,

What is the flux linkage of 3-phase line conductors?

As the conductors are symmetrically spaced from each other therefore the flux linkage of each conductor will be same. Due to this, the inductance of each phase conductor will be same. Therefore for symmetrical spacing of 3-phase line conductors, The flux linkage of each phase conductors for unsymmetrical spacing are not same.

Why voltage at the receiving end is not the same for three-phase?

Due to this the inductance of the three phase conductors will be different. Because of this, there will be unequal voltage drop in the three phases even though the currents in phase conductors are balanced. Thus the voltage at the receiving end will not be same for the three phases.