第1个回答 2012-06-26
Electric power industry is the foundation of the national economy, is the important industry, it and national rise and fall of the people's health and have a close relationship. 220 kV substations is China's current power grid system of main node, with large capacity, cover an area of small, investment relative economic advantages.Out of these a few respects consideration, this paper designed a 220 kV buck substations, the substation has two voltage level, a is 66 kV, one is 10 kV. This design including load calculation, transformer choice, the main electrical wiring design, short circuit calculation and electrical equipment choice; According to the design of the actual situation, the first need coefficient method for the load material analysis, according to load calculation results, choose the two transformer, use dark spare tied for operation mode operation; Comprehensive exam ?
第2个回答 2012-06-28
Thepower industry isthe foundation of the national economy,is an importantpillar industry,itis closely related tothe rise and fallofthecountryand the people'swell-being.220kV substationisthe mainnodeofthe current gridsystem,with large capacity,small footprint, investmentrelativeeconomic advantages.
Fortheseconsiderations,thispaperdesignofa220kVstep-downsubstation,thesubstationhas twovoltage levels,a66kV,a10kV.Thedesign includesload calculations, transformerselection,choiceofmain electrical wiringdesign, short circuitcalculations,aswellaselectrical equipment;accordingtothedesign ofthe actual situation, first of allneedcoefficient methodtoloaddataanalysiscalculation,loadcalculations,thetwo transformers,darkstandbyparallel operationoperation;consideredthemain wiringand other aspectsofeconomy and reliabilityfactors,determinethe220kVside of theformofwiringwithin thebridge, 66kVterminalform ofdual bussegment;unit valuemethodtocalculatetheshort-circuit currentselecthigh-electrical equipment, according toshort-circuit currentcalculationsand thustheactionofthe stability ofcalibration,and thermalstability of thecalibration;usingthelightning rodto prevent thesubstationdestructionbylightning directly stroke, the use ofsurge arrestersto prevent thesubstationbythelightningdamage;transformersetgas protection,longitudinaldifferential protection,overcurrent protectionandotherprotection devices.In the design process,wiring,electrical equipment,reactivecompensationdevices,protection devices,and strive to achievereliable operation,simple operation, convenient, economical and reasonable, withtheexpansionofthe possibility offlexibilityandchange the operation mode,make it morefittotheactual,more practical significance.