By Jerry C. Whitaker
Right operation of delicate apparatus calls for recognition to brief disturbances, grounding practices, and standby strength wishes. This moment version of the winning AC strength structures guide makes a speciality of engineering know-how necessary to the layout, upkeep, and operation of alternating present energy supplies.What's New within the moment Edition?oExpanded dialogue on power-system componentsoNew bankruptcy on grounding practicesoAppendix masking engineering information and tablesoUpdated fabric in all chaptersServing engineering group of workers considering the specification, set up, and upkeep of digital apparatus for undefined, this revision comprehensively examines the layout and upkeep of ac strength platforms for critical-use functions. AC energy structures guide additionally displays the elevated circulation towards microelectronic apparatus and microprocessor-based structures in addition to the elevated precedence between electronics engineers at the defense of such platforms.
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High pressure, at about 2235 psi, prevents boiling. Pressure is maintained by a pressurizer, and the water is circulated by a pump through a heat exchanger. The heat exchanger evaporates the feedwater and generates steam, which supplies a system similar to a conventional power plant. The advantage of this two-loop system is the separation of the potentially radioactive reactor cooling fluid from the water-steam system. The reactor core consists of fuel and control rods. Grids hold both the control and fuel rods.
The water is evenly distributed along the periphery of the runner by a concrete spiral case and regulated by adjustable wicket blades. The water is discharged from the turbine through an elbow-shaped draft tube. The conical profile of the tube reduces the water speed from the discharge speed of 10 to 30 ft/s to 1 ft/s to increase turbine efficiency. The hydrogenerator is a low-speed (usually 120 to 360 rpm) salient-pole machine with a vertical shaft. The typical number of poles ranges from 20 to 72.
The turbine converts the heat energy of the steam into mechanical energy. Modern power plants typically use one high-pressure and one or two lower-pressure turbines. High-pressure steam enters the high-pressure turbine to flow through and drive the turbine. The exhaust is reheated in the boiler and returned to the lower-pressure units. Both the rotor and the stationary part of the turbine have blades. The length of the blades increases from the steam entrance to the exhaust. 36 shows the blade arrangement of an impulse-type turbine.
AC Power Systems Handbook by Jerry C. Whitaker