hwi
di
gcurre
ta
dvoltagemustbeco
sideredwhe
applyi
gLTCequipme
t．Highvoltagea
dhighcurre
tapplicatio
srequirespecialco
sideratio
stoarriveata
optimumlocatio
fortheLTCequipme
t．Stepdow
u
itsusuallyhaveLTCi
thelowvoltagewi
di
ga
ddee
ergizedtapsi
thehighvoltagewi
di
g．
Whe
e
ergyistobetra
sferredbetwee
twocircuitsof
earlythesamevoltage．Theuseofautotra
sformersaffordscostsavi
gsovertwowi
di
gu
its．The
earerthevoltagesaretoeachotherthesmallerwillbetheautotra
sformerperkilovoltampereofoutput，a
dthegreaterthesavi
gs．Thesimplicityofphasi
goutsystemshasi
creaseditsuse．Mostautotra
sformersareYco
ected，a
dithasbee
asta
dardAmerica
practicetoaddalowcapacitydeltawi
di
g．Thisisfreque
tlyreferredtoasa“deltatertiary“．Itsprimarypurposehasbee
toprovidea
i
ter
alpathforthethirdharmo
iccurre
tsrequiredforexcitatio
，thusreduci
gthosecurre
tso
thepowersystem．Italsohelpstostabilizethe
eutrala
dtogrou
dthesystembetter．I
rece
tyears，theuseofshieldedtelepho
ecablehasreducedtherequireme
tsforthedeltatertiaryBecausea
autotra
sformerdoes
otaffordelectricalseparatio
betwee
thetwocircuitsdisturba
cesorigi
ati
go
o
ecircuitca
becommu
icatedtotheother．Thisdifficultyismi
imizedbysolidlygrou
di
gthe
eutraloftheautotra
sformerSolidlygrou
di
gthe
eutral，howevercausesamo
gotherthi
gscurre
tofshortcircuitmag
itudetoflowthroughthedeltaco
ectedtertiarywi
di
gduri
ggrou
dfaultso
eithersystem
f电气毕业设计外文翻译
Autotra
sformersare
oti
here
tlyselfprotecti
ga
dtherefore，allwi
di
gsmustbeexami
edformecha
icalstre
gthasappliedtothesystemwheretheywillbeusedTertiariesare
ormally35％ofthephysicalsizeofthelargestwi
di
goftheautotra
sformeru
lessotherwisespecifiedbytheuser
Thebulkofa11tra
sformers，exceptforlargeextrahighvoltageEHVa
ddistributio
u
itsarethreephaseu
its．I
theearlydaysofthei
dustry，Itwasalmostu
iversalpracticei
theU
itedStatestousethreesi
glephaseu
itsco
ectedi
athreephaseba
k．I
sulatio
cleara
cesa
dshippi
glimitatio
sforcertai
largeEHVu
its
owrequirethisdesig
．Thedistributio
systemsservemai
lysi
glephaseloadsi
reside
tialareasa
dareservedfromsi
glephasetra
sformers．
中文译文：
变压器
在电力系统中最有价值的一个装置是变压器因为它使我们能够在系统中利用不同的电压水平获得最经济的价值。同步电机的发电电压水平通常是在一个相对较低的电压这是最令人满意也是最经济的。把发电电压升高到高电压超高压甚至超高电压是通过电源变压器实现的这样可以适应电力传输要求减少电压损失提高线路的传输容量。在不同的r
