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SIEMffiNS
'lhc
prirrrr'lruovcrs
aro
tl
icscl
r:lqilr:s
Ty;te
:
14y44f
Iil
/
W,4€RrJ/L4€
and
steatn
turbi
ne
rype
:
pEraR SRoruflHocJ-t
1.1.1
Construction
All
dlternators are rotatinq-fie1d
uachines
jn
which
the
cylindrical
rotor
carryinq the d.c.-excited
fjeld
winding and the
dantper r.rinding
rotates inside lhe stator
wltich
carries thc
a.c.
output
vrindin13.
The
alternators
incorporate an
a.c. cxciler
ancl
r0tating rectifiers
tllountcd
0n
lh0
sh,rf
t,
vihich provldr-.
Lhc
rxr:
jl-atiorr
currert
for
1.lre nrain
uach
i
ne.
.
Tlle
sh0rt-cjrcuit cu|renl
nccessaty
for
selectivc tri;'rltinq
is
provrderl
by
the
brushle
ss
TilYlllPAR'[ exci
t,rtion
syst.er)l.
The vol
lage
in
the excit,rtion
circuiL
for
l.he
excitcr
is
regulateo
oy
a
thyristor
fequl
a
Lor.
1.
1.2
!_o_l tq_rJ_e_..i.onll9_1.
V0ltage
accLrracy
static jn
the
rangc
bet$,een
no
l0ctd
t0
raLed
load
and
rated
por,/er
factor,
when runnirrrr
alone (r.rithout droop
contpensa
ljon
device)
Uru
I
0.5?1
for
1[C5 352
to
1l:C5 636
wjth
blushless
l'l Yt{lPAilI-exci1.a1-ion,
r",
I
0,5,,,l,J'r,
fsr
lFG4 184
t.,
lF64
316
ui++-+ram-i+ter-regt|}&{:ef.
rvlien
lunning
is
parallel
U"
1.
2.57,1
for lf#6-te-*F€.4-:*6
(
*++*r-tt-+roop-conrfrcrrsaffun--dsv-ir:e
),
1FC5
352
to
1FC5
F,36
(with
a
droop
conrl>ensation
device).
Th'i
s
norrirally
.r'l
lows
for
tlre
speed
of
the
prinre nrover
to
i
ncreasr:
by
5%
urhen
the loild
is
reduced fronr
ful
l-load to
no-load.
The nrcthod
of
excitertion
used
for
the
frachines
gjves
thetr]
very rapi.l
resp0nse
whjch
results in
the
volt.rge drop
ccrused
by
sLrclden
large
ctr.rnges
in
laotl
with a
high reactive
currer'rt
colrponenL
bein(j
d.Irped
out
r,rj
I,hin
a
few
cycles.
This
characteristic
is
beneficial
for
lhe
direct-ol-l
irre
5tartjn(l
of
re)atively larqc
squirrcl-cage
Inot0rs.
1.1.3
Voltage drop r.,ijth load
increase
'the
fol
lovring diagranls enable
the
nragnitude
of
the
sudden
output
vol
t-age
drop
to
be estjfilated.
The
graphs
assunre
that
the
loacl
is
p'r
aced
o
the
Inachine when
rur'rn
j
ncl
aI
no load
and
excited
to
ralted
voltaqe
and
there
is
no
resultarrt
dro1.r
in
speed.
The diagrarns shows
curves
for 0, C.5,0.i]
and
1.0
povrer
frlc'L0r
of
thc
appl
ied 1oad.
The
values
for
intenlediate
,ralues
of
the
por./er
factor'
can be estinrated.
-2
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