Salient Pole Synchronous Generator: A Salient Pole Synchronous Generator, as shown in Fig. 4.29, is distinguished from a round rotor machine by constructional features of field poles which project with a large interpolar air gap. This type of construction is commonly employed in machines coupled to hydroelectric turbines which are inherently slow-speed ones so that […]
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Phasor Diagram of Synchronous Motor: The Phasor Diagram of Synchronous Motor is the most important element of a power system. It converts mechanical power into electrical form and feeds it into the power network or, in the case of a motor, it draws electrical power from the network and converts it into the mechanical form.
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Complex Power Flow in a Single Phase Load: Here we are going to discuss about complex power flow in a single phase load. Consider a single phase load fed from a source as in Fig. 4.9. Let When θ is positive, the current lags behind voltage. This is a convenient choice of sign of θ
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Per Unit System in Power System: Per Unit System in power system is usual to express voltage, current, voltamperes and impedance of an electrical circuit in per unit (or percentage) of base or reference values of these quantities. The per unit value of any quantity is defined as: The Per Unit System in Power System
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Single Line Diagram of Power System and Impedance or Reactance Diagram: A single line diagram of power system shows the main connections and arrangements of components. Any particular component may or may not be shown depending on the information required in a system study, e.g. circuit breakers need not be shown in a load flow
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Balanced Three Phase Circuit: The solution of a balanced three phase circuit is easily carried out by solving the single-phase network corresponding to the reference phase. Figure 4.1 shows a simple, balanced three phase circuit. The generator and load neutrals are therefore at the same potential, so that In = 0. Thus the neutral impedance
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Use of Bundled Conductors in Transmission Line: A Bundled Conductors in Transmission Line is shown in Fig. 3.13. The conductors of any one bundle are in parallel, and it is assumed that the charge per bundle divides equally among the conductors of the bundle as D12 ≫ d. Also D12 – d ≈
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Effect of Earth on Capacitance of Transmission Line: In calculating the Effect of Earth on Capacitance of Transmission Line, the presence of earth was ignored, so far. The effect of earth on Capacitance of Transmission Line can be conveniently taken into account by the method of images. Method of Images: The electric field of transmission
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Capacitance of Three Phase Line with Unsymmetrical Spacing: Figure 3.7 shows the three identical conductors of radius r of a Capacitance of Three Phase Line with Unsymmetrical Spacing. It is assumed that the line is fully transposed. As the conductors are rotated cyclically in the three sections of the transposition cycle, correspondingly three expressions can
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Capacitance of Three Phase Transmission Line with Equilateral Spacing: Figure 3.5 shows a Capacitance of Three Phase Transmission Line with Equilateral Spacing composed of three identical conductors of radius r placed in equilateral configuration. Using Eq. (3.2) we can write the expressions for Vab and Vac as Adding Eqs. (3.8) and (3 9), we get
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