Performance of Power Transmission

Power Flow through Transmission Line

Power Flow through Transmission Line: So far the transmission line performance equation was presented in the form of voltage and current relationships between sending-and receiving-ends. Since loads are more often expressed in terms of real (watts/kW) and reactive (VARs/kVAR) power, it is convenient to deal with transmission line equations in the form of sending- and …

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Tuned Power Lines in Transmission

Tuned Power Lines in Transmission: Equation (5.23) characterizes the performance of a Tuned Power Lines in long Transmission line. For an overhead line shunt conductance G is always negligible and it is sufficiently accurate to neglect line resistance R as well. With this approximation Hence Eq. (5.23) simplifies to Now if ωl√LC = nπ, n …

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Ferranti Effect in Transmission Line

Ferranti Effect in Transmission Line: The effect of the line capacitance is to cause the no-load receiving-end voltage to be more than the sending-end voltage. The effect becomes more pronounced as the line length increases. This phenomenon is known as the Ferranti Effect in Transmission Line. A general explanation of this effect is advanced below: …

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Transmission Lines and Waveguides

Transmission Lines and Waveguides: As we know already that, γ is a complex number of Transmission Lines and Waveguides which can be expressed as The real part α is called the attenuation constant and the imaginary part β is called the phase constant. Now Vx can be written as where The instantaneous voltage vx(t) can …

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Long Transmission Line

Long Transmission Line: For lines over 250 km, the fact that the parameters of a line are not lumped but distributed uniformly throughout its length, must be considered. Figure 5.10 shows one phase and the neutral return (of zero impedance) of a Long Transmission Line. Let dx be an elemental section of the line at …

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Medium Transmission Line

Medium Transmission Line: For lines more than 100 km long, charging currents due to shunt admittance cannot be neglected. For lines in range 100 km to 250 km length, it is sufficiently accurate to lump all the line admittance at the receiving-end resulting in the equivalent diagram of Medium Transmission Line shown in Fig. 5.7. …

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