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000000262 037__ $$aENY-ARTICLE-2008-208
000000262 041__ $$aeng
000000262 100__ $$aMarkiewicz, H$$uWroclaw University of Technology
000000262 245__ $$aImproving Reliability with Standby Power Supplies
000000262 260__ $$c2003-05-11
000000262 300__ $$a20p
000000262 500__ $$aCopyright© European Copper Institute, Wroclaw University of Technology and Copper Development Association.
000000262 520__ $$aThe design of electrical power supply systems is a compromise between the interests of consumers - reliability and quality of supply - and those of the supply industry - realistic investment levels and operating costs. The flexibility allowed to deviate from ‘perfect’ power quality should be used to allow cheaper and simpler supply systems; it should not be wasted by permitting poor maintenance and operating procedures to compromise reliability. Electrical equipment is designed to operate optimally under normal conditions, i.e. with a supply voltage that is within rated voltage and frequency tolerances with low voltage distortion and good phase balance and within the manufacturer’s specified environmental conditions. Operation outside these limits can result in increased losses, poor efficiency and unpredictable operation. Large deviations can cause disruption due to the false operation of protection devices. Voltage quality has a decisive influence on the operation of equipment. The voltage quality at the origin of the installation (the point of common coupling) is reduced further by the effects of other loads in the installation and the resistance of the cabling, so the voltage quality at the equipment terminals is much poorer. This is especially true in cases where loads with non-linear voltage-current characteristics are present. Disruption caused by power interruption or poor voltage quality is always inconvenient and can be serious. In hospitals there is an obvious risk to patients undergoing operations or in intensive care. Public buildings, such as cinemas, theatres, exhibition halls, etc, where people are concentrated in relatively confined and unfamiliar areas, pose a particular risk during a power failure. Manufacturing industries, especially continuous process manufacturing (paper, steel) or high technology manufacturing (semiconductors), suffer long recovery cycles following any loss of power.
000000262 700__ $$aKlajn, A$$uWroclaw University of Technology
000000262 8560_ $$
000000262 8564_ $$u$$zAccess to Fulltext
000000262 909CO $$$$pglobal
000000262 980__ $$aARTICLE