Equivalent Circuit of Long Transmission Line | π and T network: So far as the end conditions are concerned, the Equivalent Circuit of Long Transmission Line can be established in the form of a T- or π-network. The parameters of the equivalent network are easily obtained by comparing the performance equations of a π-network and […]
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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: 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: 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: 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: 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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Voltage Regulation of Transmission Line: Voltage Regulation of Transmission Line is defined as the rise in voltage at the receiving-end, expressed as percentage of full load voltage, when full load at a specified power factor is thrown off, i.e. where |VR0| = magnitude of no load receiving-end voltage |VRL| = magnitude of full load receiving-end
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Equivalent Circuit of Short Transmission Line | Phasor Diagram of Short Transmission Line: For Short Transmission Line of length 100 km or less, the total 50 Hz shunt admittance (jωCl) is small enough to be negligible resulting in the simple Equivalent Circuit of Short Transmission Line is shown in Fig. 5.1. This being a simple series
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Introduction to Power Transmission Line: Introduction to Power Transmission Line deals primarily with the characteristics and performance of transmission lines. A problem of major importance in power systems is the flow of load over transmission lines such that the voltage at various nodes is maintained within specified limits. Transmission lines are normally operated with a
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What is Load Curve?: Load drawn by consumers is the toughest parameter to assess scientifically. The magnitude of the load, in fact, changes continuously so that the load forecasting problem is truly a statistical one. A typical daily Representation of Load Curve is shown in Fig. 1.1. The loads are generally composed of industrial and
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