AC power systems by Whitaker, Jerry C

By Whitaker, Jerry C

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35. The feedwater enters through the economizer to the boiler, which consists of riser tubes that line the furnace wall. All the water is converted to steam and fed directly to the superheater. The latter increases the steam temperature above the critical temperature of the water and drives the turbine. The construction of these steam generators is more expensive than the drum-type units but has a higher overall operating efficiency. The turbine converts the heat energy of the steam into mechanical energy.

7 A typical electrical power-generation and distribution system. Although this schematic diagram is linear, in practice power lines branch at each voltage reduction to establish the distribution network. (From [5]. 1 Basic Principles In 1831, English physicist Michael Faraday demonstrated the phenomenon of electromagnetic induction. The concept is best understood in terms of lines of force, a convention Faraday introduced to describe the direction and strength of a magnetic field. 8. When a second, independent loop of wire is immersed in a changing magnetic field, a voltage will be induced in the loop.

FLPI is a measure of the ability of a transformer to maintain its rated voltage with a varying load. The lower the FLPI, the better the regulation. FLPI also determines the maximum fault current that the transformer can deliver. For example, if a 5 percent FLPI transformer supplying 5 A nominal at the secondary is short-circuited, the device can, theoretically, supply 100 A at full voltage. A similar transformer with a 10 percent FLPI can supply only 50 A when short-circuited. 1. 4 Design Considerations As touched upon previously, permeability µ describes the ease with which magnetic flux can be produced in a given material.

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