Capacitance of Two Wire Line: Consider a Capacitance of Two Wire Line shown in Fig. 3.3 excited from a single-phase source. The Capacitance of Two Wire Line develops equal and opposite sinusoidal charges on the two conductors which can be represented as phasors qa and qb so that qa = – qb. The potential difference […]
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Potential Difference between a and b: Figure 3.2 shows a group of parallel charged conductors. It is assumed that the conductors are far removed from the ground and are sufficiently removed from each other, i.e. the conductor radii are much smaller than the distances between them. The spacing commonly used in overhead power transmission lines
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Electric Field Inside a Conductor: Imagine an infinitely long straight conductor far removed from other conductors (including earth) carrying a uniform charge of q coulomb/metre length. By symmetry, the equipotential surfaces will be concentric cylinders, while the lines of electrostatic stress will be radial. The Electric Field Inside a Conductor at a distance y from
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What is Skin Effect and Proximity Effect?: What is Skin Effect and Proximity Effect? – The distribution of current throughout the cross-section of a conductor is uniform only when DC is passing through it. On the contrary when AC is flowing through a conductor, the current is non-uniformly distributed over the cross-section in a manner
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AC Resistance and DC Resistance Relation: Though the contribution of line resistance to series line impedance can be neglected in most cases, it is the main source of line power loss. Thus while considering transmission line economy, the presence of line resistance must be considered. The effective AC resistance is given by Where I is
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Bundled Conductors in EHV Transmission Lines: It is economical to transmit large chunks of power over long distances by employing EHV lines. However, the line voltages that can be used are severely limited by the phenomenon of corona. Corona, in fact, is the result of ionization of the atmosphere when a certain field intensity (about
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Inductance of Double Circuit Three Phase Line: It is common practice to build double circuit three phase Line so as to increase transmission reliability at somewhat enhanced cost. From the point of view of power transfer from one end of the line to the other, it is desirable to build the two lines with as
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Inductance of Three Phase Line with Unsymmetrical Spacing: The basic equations developed can, however, be easily adapted to the calculation of the Inductance of three phase line. Figure 2.10 shows the conductors of a three phase line with unsymmetrical spacing. Assume that there is no neutral wire, so that Unsymmetrical spacing causes the flux linkages
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Inductance of Composite Conductor Lines: Future 2.6 shows such a single-phase line comprising inductance of composite conductor lines A and B with A having n parallel filaments and B having m’ parallel filaments. Though the inductance of each filament will be somewhat different (their resistances will be equal if conductor diameters are chosen to be
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Flux Linkage of n Parallel Conductors Carrying Current: As shown in Fig. 2.5, consider a group of n parallel conductors carrying current I1, I2 ,…, In whose sum equals zero. Distances of these conductors from a remote point P are indicated as D1, D2 ,…, Dn. Let us obtain an expression for the total Flux
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