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SEffiMffifiSS
t.r.7
.2
Efficiency
dependent
0n
pov/er
factor
Ifficiency
n
1.0
dpprox.
at
poyrer
factor
0.9
approx.
NQ
approx.
0.7
a
ppr0x.
)nz
rJ+1
?
-
Is
I.1.3
l)o-
r.rc
r
consultption
^
_
S
x p.i. x 100
c
f
= ., -,--)------ -----
J
an
Po
Prirre unver
povier
output
S
/\l
l.ernator
l)ower
output-
i
U
Vol
t-aqe
in
V
I)
x
n
=!,
j
I
n
p.f, x
l0a)
i
n
kll
n
kVA
S
x
l0il0
=
-
.-::-
-----
-
V3
x
ll
Current
in
A
[ l'f ir:i ency
i
r
li,
1.1.9
Short-circuit current
and
short-circuit
riit-incl
I.
1.
10
Jlte corttinuous
sh0rt-circuit
current
of
lhe
brrtshless itlternators
'i
s
annrox. 3
tirne
s
rated current.
'Ihe n.rxinurn
v,r'l
ue
of jnitial
short-cirr:ui l. currt:rrl
l,tid
dor;in by
Vl)1
0Ii30,
2l
Lirrrcs
l.hc
rurs
valttc
ttl'
llur
rat.prl
crlrronl.
(etluir
I
Lo
J5
[irrrc5 peak raLed
value) r'elat.ivc
t.o
l"]t0
Vt)[ outl]Lrt
is
noL
excr:r:rlcd.
l'he contjnous
slr0rt-circuj
L currer.rt
nust be tripped
after
2
or
].5s
for
the
al
ternators type
iFC5 352-lFC5 63ti
or tF€#lt!HBl-J*6
The
.rlternators are able to
vrithstand
the
stresses
caused
by
the
short-circuit,
as long as
such
short-circujts
occur
only
scldonr.
The
alternaL.ors
have
a
particular
lovi sub-transjent reactarce v/itlr
gives
'1
or,r
values
of
transient
voltaqe
drop
when
load
is
applied,
arrd
also a rapid rate
of
volta!te
recovery.
lt
dlso
rrreans
that
the
.rl
terrrators
c
h
a
r
a
c
t
e
r
i
s
t j
c
a
I
I
y
c.rrry a
relativcly
hiilh
fault
cr-rrrcrt
in
the evcnl
of
short-cifcuj
t,
urhich
pcnnjts
selecl:jvity irr
proL{rcLiorr.
_ry-pe"s
of
el_c]-qljg_I,rl-D_LrlJ]f.]€ss
_!ytL9_lLl-0-!.!o$=q_ll-Cltfqf_S!!
The
brushless
synchronous
a'l
ternators consist
of
the
rotat-
jng field
nrachjne
(arnrature)
with a
non-salient pole(c.ylindrical
rotor),
exciter
(external
synchronous gen-erator)
ar.rcl
the
excitation systern.
Al
lernators
1FC5
352
to
1FC5
636
are
eouipped
with
the
brushless
T
H
Y
II
I
P
A
R
I
-
e
x
c
i t
a
-
t
i
on,
aftern+t+e+-+pE++W*nri*ert*x1-te1-b.r1re
i"eS+l-a+er
ry,
as
a
standarcl
.
A reference value
setter
for
instal
lation
in
the
suitchboard
is
sutrtrlies
viith the cquipnrcnt.
lt
pernri
ts
the voltage
to
be
set
accurately
to
+
5[
vrhen
the
povier
factor
1s betueen
0.8
and 1.0.
-1
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