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Many years of experience with extra-high-voltage DC (EHVDC) transmission lines has demonstrated that DC voltages as high as 800 to 1000 kV could be sent cost-effectively over long distances with minimal line losses It was also found that EHVDC can overcome some problems that restricted the use of alternating-current systems over the
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same route In the United States 800-kV HVDC systems are now operating, but a 1000-kV system is operating in Sweden The greatest disadvantage of EHVDC is the need for costly AC-to-DC conversion equipment to convert incoming AC power to DC power and later reconvert it to AC for distribution to consumers at useful voltage levels The development of solid-state rectifiers has made overhead HVDC economical for distances of more than 400 mi (650 km), but underground HVDC transmission lines are a far shorter 25 to 30 mi (40 to 50 km)
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POWER SYSTEM EQUIPMENT
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CONTENTS AT A GLANCE Overview Transformers, General Transformer Characteristics Glossary of Transformer Terms Kilovarmeters High-Voltage Circuit Breakers Synchronous Condensers Circuit Switchers Phase Converters Reclosers Power Semiconductor Devices Interrupter Switches Voltage Regulators Power Factor Primary and Secondary Power Capacitors
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Copyright 2003, 1997 by The McGraw-Hill Companies, Inc Click Here for Terms of Use
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POWER SYSTEM EQUIPMENT
Overview
This chapter covers the functions performed by high-voltage power transmission and distribution equipment in the electrical power industry Basic transformer theory is discussed here to highlight the similarities in construction and operation of all transformers, whether they are low-power units or high-voltage transformers used in transmission and distribution The transformer configurations used in single-phase and three-phase applications are discussed In addition, the more specialized voltage and current transformers for high-voltage instruments as well as autotransformers are explained The transformer section of this chapter includes a glossary of transformer terms for ready reference The circuit breakers discussed in this chapter are rated for more than 600 V They operate on different principles than the more familiar low-voltage units and have different distinguishing features (Residential low-voltage circuit breakers are discussed in Chap 5) The functions of high-voltage circuit switchers, reclosers, interrupter switches, and voltage regulators in power transmission and distribution systems are explained To make the most effective use of AC power, it is important that inductive reactances be minimized to bring the voltage and current waveforms into a closer phase relationship The subjects of power factor and power factor correction are discussed, and the role of power capacitors in power factor correction is explained The use of the kilovarmeter to monitor power factor and capacitive reactance during typical 24-hr periods is discussed The way in which rotary or static phase converters convert single-phase to threephase power is explained Power semiconductors are playing an increasingly important role in power rectification and control The semiconductor devices most widely used in the performance of those functions are identified and explained
Transformers, General
A transformer is a static electrical component with no moving parts that is used for stepping voltage up or down or isolating one circuit from another Transformers have the ability to convert low-voltage, high-current AC to high-voltage, low-current AC, or vice versa, with minimal energy losses Minimizing energy losses is critical in all power generation, transmission, and distribution systems Transformers work only with AC in accordance with the physical laws of magnetic induction, and they are inherently low-loss components The simplest low-voltage transformers can be made by winding separate coils of insulated wire around a ferromagnetic core, typically a stack of steel laminations When one coil or winding, called the primary or input coil, is energized, the core is magnetized so that the resulting magnetic flux induces a voltage in the second winding, called the secondary or output coil The change in voltage (voltage ratio) between the primary and secondary coils depends on the number of turns in each winding Transformers are widely used in electrical power and lighting circuits as well as many low-voltage electronic products The large transformers in power generation sta-
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