58-16 Chemical Variables
HPLC is also used for evaluation of the quality of mineral insulating oil [27,28]. e presence of
ce
rtain
ch
aracteristic
ch
emical
co
mpounds
is of co
nsiderable
im
portance
in th
e
el
ectric
in
dustry
. i
s
te
chnique
is al
so
us
ed
to id
entify
th
e
pr
esence
of so
me
by
-products
of oi
l
un
der
el
ectric
st
ress,
su
ch
as
x-
wax
an
d
u
orescence
ma
terials
. Po
lar
co
mpounds,
su
ch
as ac
ids
an
d
al
dehydes,
ar
e
al
so
pr
oducts
of
ox
idation
of oi
l
an
d
th
ey
ca
n
al
so
be de
termined
by HP
LC
. Ea
rly
de
tection
of su
ch
pr
oducts
is im
por-
tant
in tr
ansformer
co
ndition
mo
nitoring
to pr
ovide
pr
ior
wa
rning
of a de
veloping
fa
ult
an
d
to en
able
ap
propriate
c
orrective
a
ction
to b
e
t
aken
.
HPLC is also used for health and safety monitoring of the polyaromatic hy