船舶電力系統(tǒng)短路電流計算方法研究.pdf

1、哈爾濱工程大學碩士學位論文船舶電力系統(tǒng)短路電流計算方法研究姓名：趙巖申請學位級別：碩士專業(yè)：電力系統(tǒng)及其自動化指導教師：蘭海20090301哈爾濱1：稃大學碩學位論文ABSTRACTShortcircuitisausualfaultwhichisoneofthefaultsdestroytheshipelectricpowersystembadlyTheshortcircuitcurrentcalculationresultcanpmv

2、idenecessarydataforsettingdelayprotectionstrategychoosingelectricaldevices，andcheckingthestabilityoftheelectricalequipmemsandthebreakingcapacityofswitches，inshipelectricpowersystemSoitisveryimportanttogetaccurateshortcir

3、cuitvaluesThenationalmilitarystandardshort—circuitcurrentcalculationmethod(GJB一173)，whichispublishedin1986，iswidelyusedinshipsespeciallynavalshipsBut，inordertomakethecalculationcarryoneasilyGJB173ignoresSOmuch，thatthecal

4、culationresultislarger，whichbringstroublestosettingprotectiondisposition，andselectingappropriatedevices，SOitisnecessitytoimprovetheGJB173method，andgiveoutanewcalculationmethod，whichismoreaccurateThemaintaskofthispaperist

5、oanalyzetheGJB一173calculationmethodandfindoutthereasonswhichmakethecalculationresultSOlargerthenthecalculationmethodisimproved，andanewoneisoffered，whoseaccuracyisvalidated，and，asoftwareissuppliedforsimulation1Theperiodic

6、currentsubtransientattenuationofgeneratoristakenintoconsideration，whencalculatingtheshort—circuitofgenerators，andthedecaytimeconstantiscorrectedinviewofthelineimpedancewhentheshortcircuitpointisawayfromthebus—bar2Whencal

7、culatingtheshortcircuitcurrentofmotors，theparallelrunningmotorsarereplacedbysomesametypeeqmvalentmotors，andtheparametersoftheequivalentmotorsuch髂thequantitythepowerandtheattenuationtimeconstantarecalculatedbysquarerootme