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SHffiMffiIWS
A standard
feature
of
the
al
ternator's
+Fffi+fr/1FC5
352-636
is
the current
contDensation
unrt.
Sirrrrlar
d1)d
ciissillilar
al
lernat.ors
c,tn
run
parallel
r'rjthout
I
inritalion
at
a
Llnifornr acijusted volla(e-contpensatio
Thus
an equal rcactr've
l)orler
range
;
this
.rlso
appl
ies
if
equa
1
.
sharincl
is
achjeved
over the
entjre
loa,.l
1.he
dcLive
loa(
sharinq
is
not
exacl)y
I
f
const-ant.
p,rra1
lel
ol'(lcr.
operat.i0n
is
|cqui|crl
,
lhis
rrus
l.
be stnl.ed
jrr lllr
lrt ordeI
to
cnsure ft'eetlo|r
f|o
e
l
e
c
l.
r
o
-
t
I
e
c
h
a
n i
c
a
l
vibt'aljon,
the
ncltura
l
frequencies
of
the
set-s
rlusl
be
sul'l'icienLl,v
far
f
rorl
the
sjrtgle-syl inder
and
nulti-cylinder
excitirrg
pulses
of
tl.re
prine
ntover.
so
that
resonance can be
avoidecl
.
.l
lre brushless
altefnalors
do
n0t
re(lui
rc
l.ralal'l
el
corrrrr-'ctjons
for
1.hr:
trcil{ ' cil-LitlS.
l.
l.
11.
i lletrtrol
cornc(tions
lf
1-he
neutral points
of
the altern,rlors
jn
a
systen
are
irterconncr:l:ed
and/or
connec Led
directly to
those
of
transl'ornlers and
loads, currerls
of
three
tines
sysLent
fre(luericy can
0ccur.
Theif
nraqnitude nrust
be
ttteasured
jn
tlre allernator neutral
conduc
t;u|s
unclr:r
al1
possi[r'l
e
]oarl
conditiorts
to
be nret
in service.
In ordor that
the .rlternators
cdn not
be
overheated. these
currenls ol' tlrree tjlres
systern frecluency
rrust
not
exceed
approxinrately 501
of
the
rcs
rective alternalor
currenl..
Ixcr:,,s
jve
currents should be
linrited, e.q.
by
near)s
ol' ncutral reactors
ur
sirrrilar;
a
spcci
f
ic
crluir',v
is
rrecr:ssary
for
l.ltos,c il.olrs.
1..1
.12
Speed
and
dilcction
of
rat.rt-ion
'lhe
noninarl
fretluency
of
60liz
is
procluccd a1.
the rated
speed.
Unless othenvise
stated
il
speed
th€ rated
value
to
zero
wtll
be
tage
control'
)
rise
of
5"
rrhen
1.he
lo.rd
is
reduced
l'r'orl
assunred
(as
Uiven
in
lhe para.
on "Vol-
1.1.13
L1.14
Jhe
al
terncrtors are supplied
for
clockujsc
ancl
anti-clockli
ise
rot,rt-i{)n.
The
lerrtinal
sequence
U,V.\,/.
jn
thc tenrirral
box corresponds
to
Lhr:
plrase
rotation
to
VDt 0530
for
clocllr'ri
se
roLaLi0n.
lnsulation
Class
I
insulation
is
used
as (r
sL,]nddrd featrrle
for
the alternators.
an0
va
p0Ltr5
,
0Lis
L
occurring
in
narirrc
This prolects tlre
r.rinding
against corrosive
gases
and
oil,
and
is
suitable
for
the genrral
str'esses
application,
i
!!q-!q'-y:$ru
The three-
phase
connec
ted
.
The
and exci
tation
stdtor-
f/indjng
is
of
three
vri nd
i
ng ends
Ul
connections
F1 and
F2
lhe
double-1ayer
type
arrd
star
,
V1,
l'I1
,
the
neutral point
11
are
b
rouqh
t
out
to
the
cal16e
-10-
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