Toshiba VK-6M32A Installation Operation & Maintenance page 15

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Table
1
.
RATINGS
Numbol6
ITIOTES:
Basis,
ANSI C37.06)
r€fer
to
the
r)
2l
3)
ANSI
C37.OB
does
not
define
thes€
r6tings.
MEximum voltage
for
which
lhe
circuit
breaker i6
d€signed and th6 upper
limit for
operation.
K ic
the latio of
rSted maximum vollage
to
th6 lowar limit
of
the
range
ot
opetating
vohage in which tha roguir€d symm€trical
and asymmefiical interrupting cap8bilitiss
vary in inv€rs€ proportion to the oper€ting
voltSge.
To
obtain
the
requked
symmetrical
interrupting capability of
citcuit
breaker at
an operEting
voltsga betwsBn 1/K times
Irted
m€ximum
voltage
snd
ratad
maximum vohage,
the tollowing
formulS
shall be
usBd:
Required
Symmetrical lfierruptlng
(vmex)
Capability=(SCA)X*-*
(vop)
where:
SCA = Short-Circuit rms
Currant Rating from Table (kAl
Vmax= Faled Maximum
rms
Voltega {kV}
from Table
Vop
=
Measured operating voltage (kV)
5)
Crlrrsnt veluas
in
thb
column are not to
be
excEeded
even
{or
operatihg voltages
below
1/K
tim6s rated maximum voltage'
For voltages bstwBsn
the ratad maximum
voltage
8nd
l/K
times rated
maximum
voltage,
lollow
{4) above,
4)