Electrical Design of Overhead Lines

Electrical Design of Overhead Lines:

Capacitance of a Single Phase Two Wire Line : Consider a Capacitance of a Single Phase Two Wire Line consisting of two parallel conductors A and B spaced d metres apart in air. Suppose that radius of each conductor is r metres is shown in Fig. 9.21. …


Capacitance of Three Phase Overhead Line : In a Capacitance of Three Phase Overhead Line, the capacitance of each conductor is considered instead of capacitance from conductor to conductor. Here, again two cases arise viz., symmetrical spacing and unsym­metrical spacing. 1.Symmetrical Spacing: Fig. 9.24 shows the three con­ductors …


Constants of a Transmission Line : A transmission line has resistance, inductance and capacitance uniformly distributed along the whole length of the line. Before we pass on to the methods of finding these Constants of a Transmission Line, it is profitable to understand them thoroughly. Resistance: It is the …


Electric Potential Definition : The Electric Potential point due to a charge is the work done in bringing a unit positive charge from infinity to that point. The concept of electric potential is extremely important for the determination of capacitance in a circuit since the latter is …


Flux Linkage : The inductance of a circuit is defined as the flux linkage per unit current. Therefore, in order to find the inductance of a circuit, the determination of flux linkage is of primary importance. We shall discuss two important cases of flux linkages. 1.Flux linkage due …


Inductance of 3 Phase Overhead Line : Fig. 9.8 shows the three conductors A, B and C of a Inductance of 3 Phase Overhead Line carrying currents IA, IB and IC respectively. Let d1, d2 and d3 be the spacings between the conductors as shown. Let us further …


Inductance of Single Phase Two Wire System : A Inductance of Single Phase Two Wire System consists of two parallel conductors which form a rectangular loop of one turn. When an alternating current flows through such a loop, a changing magnetic flux is set up. The changing …


Self GMD and Mutual GMD : Self GMD and Mutual GMD – The use of self geometrical mean distance (abbreviated as Self GMD) and mutual geometrical mean distance (Mutual GMD) simplifies the inductance calculations, particularly relating to multiconduc­tor arrangements. The symbols used for these are respectively Ds …


Skin Effect in Transmission Lines : Skin Effect in Transmission Lines – When a conductor is carrying steady direct current (d.c.), this current is uniformly distributed over the whole X-section of the conductor. However, an alternating current flowing through the conductor does not distribute uniformly, rather it …


Updated: April 30, 2020 — 5:34 pm