电气工程及其自动化专业英语翻译
f电气工程及其自动化专业英语翻译
fElectricPowerSystemsThemoder
societydepe
dso
theelectricitysupplymoreheavilytha
everbeforeItca
otbeimagi
edwhattheworldshouldbeiftheelectricitysupplywerei
terruptedallovertheworldElectricpowersystemsorelectrice
ergysystemsprovidi
gelectricitytothemoder
societyhavebecomei
dispe
sablecompo
e
tsofthei
dustrialworldThefirstcompleteelectricpowersystemcomprisi
gage
eratorcablefusemetera
dloadswasbuiltbyThomasEdiso
thehistoricPearlStreetStatio
i
NewYorkCitywhichbega
operatio
i
September1882ThiswasaDCsystemco
sisti
gofasteame
gi
edrive
DCge
eratorsupplyi
gpowerto59customerswithi
a
arearoughly15kmi
radiusTheloadwhichco
sistede
tirelyofi
ca
desce
tlampswassuppliedat110Vthrougha
u
dergrou
dcablesystemWithi
afewyearssimilarsystemswerei
operatio
i
mostlargecitiesthroughouttheworldWiththedevelopme
tofmotorsbyFra
kSpraguei
1884motorloadswereaddedtosuchsystemsThiswasthebegi
i
gofwhatwoulddevelopi
too
eofthelargesti
dustriesi
theworldI
spiteofthei
itialwidespreaduseofDCsystemstheywerealmostcompletelysupersededbyACsystemsBy1886thelimitatio
sofDCsystemswerebecomi
gi
creasi
glyappare
tTheycoulddeliverpowero
lyashortdista
cefromge
eratorsTokeeptra
smissio
powerlossesI2Ra
dvoltagedropstoacceptablelevelsvoltagelevelshadtobehighforlo
gdista
cepowertra
smissio
Suchhighvoltageswere
otacceptableforge
eratio
a
dco
sumptio
ofpowerthereforeaco
ve
ie
tmea
sforvoltagetra
sformatio
becamea
ecessityThedevelopme
tofthetra
sformera
dACtra
smissio
byLGaularda
dJDGibbsofParisFra
celedtoACelectricpowersystemsI
1889thefirstACtra
smissio
li
ei
NorthAmericawasputi
tooperatio
i
Orego
betwee
WillametteFallsa
dPortla
dItwasasi
glephaseli
etra
smitti
gpowerat4000Voveradista
ceof21kmWiththedevelopme
tofpolyphasesystemsbyNikolaTeslatheACsystembecameeve
moreattractiveBy1888Teslaheldseveralpate
tso
ACmotorsge
eratorstra
sformersa
dtra
smissio
systemsWesti
ghouseboughtthepate
tstotheseearlyi
ve
tio
sa
dtheyformedthebasisoftheprese
tdayACsystemsI
the1890stherewasco
siderableco
troversyoverwhethertheelectricutilityi
dustryshouldbesta
dardizedo
DCorACBythetur
ofthece
turytheACsystemhadwo
outovertheDCsystemforthefollowi
greaso
s（1）Voltagelevelsca
beeasilytra
sformedi
ACsystemsthus
providi
gtheflexibilityforuseofdiffere
tvoltagesforge
eratio
tra
smissio
a
dco
sumptio
（2）ACge
eratorsaremuchsimplertha
DCge
erators（3）ACmotorsaremuchsimplera
dcheapertha
DCmotorsThefirsttr