Note: The Solution is handwritten.
FIGURE 3(a) represents a 50 Hz, three-phase, high-voltage, transmission line. For one phase, the relationships between the sending end voltage and current and the receiving end voltage are given by the complex ABCD equations:
where VS is the sending-end voltage, IS the sending-end current and VR is the magnitude of the open-circuit receiving end voltage.
(a) Given the parameter values in TABLE A and if the magnitude of the receiving-end line voltage VRL is measured as 154 kV when feeding a balanced load of 40 MVA at a power factor of 0.9, calculate the value of the sending-end phase voltage VSP and sending-end phase
[N.B. VSL = â??3 Ã- VSP and the total power in a three-phase load is given by P = â??3VI cos ?.]
(b) Hence or otherwise calculate the sending-end power and thus the power lost in the cable.
(c) If the line is modelled by the ?-circuit of FIGURE 3(b), see if you can estimate the primary line coefficients R, L, G and C. The line is 50 km long.
Please answer in full and show all working.© BrainMass Inc. brainmass.com October 25, 2018, 5:57 am ad1c9bdddf
This problem provides the solution of how to model a high voltage transmission line by a two port network.
Lock-and-key model of synaptic transmission, transducers, cortical arousal, brainwaves that characterize the deeper stages of sleep, drive-reduction theory, main goal of psychophysics, sense of vision, visual system sharpens, visual system of frogs, bug detectors
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2) Which of these are transducers? Eardrum, the jnd, hair cells.
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4) Which brainwaves characterize the deeper stages of sleep? Those that are high voltage/low frequency, high voltage/high frequency, low voltage/low frequency, low voltage/high frequency
5) According to drive-reduction theory, what is intrinsically awarding about sex? Is it the innate reinforcing quality of sexual stimulation and orgasm, the satisfaction that comes from innate need to reproduce, the rise in tension that occurs during sexual stimulation, or the removal of tension after orgasm?
6) What is the main goal of psychophysics? Is it to relate physical intensity of stimuli to neuronal functioning, to understand the processes of transduction, to understand how psychological processes can result in physical actions, or to relate the properties of stimuli to attributes of sensation?
7)If a psychologist asserts that a certain animal's sense of vision is more sensitive than its sense of hearing, what does that mean? The animal's absolute threshold for vision is lower than its absolute threshold for hearing, the animal's difference of threshold for vision is smaller than its difference threshold for hearing, the animal's Weber fraction for vision is smaller than its Weber fraction for hearing, or all three?
8) When the visual system sharpens fuzzy boundaries by creating sharp boundaries where physically, none is present, what is this effect exemplified by? Is it the brightness contrast, the stabilized image, the mach bands, or both the brightness contrast and the mach bands?
9) At what level of the visual system do frogs' so-called bug detectors operate? Is it at the level of the receptors, at the level of the ganglion cells, at the level of the superior colliculus, or at the level of the visual cortex?
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