25-6 Electrical Variables
25.3.3 Voltage and Current Adapters for AC Electronic Energy Meters
e most common devices to process ac signals for static energy meters are the traditional voltage and
cu
rrent
tr
ansformers
. e
y
mu
st
be ma
de
wi
th
pr
oper
co
mponents
to ac
hieve
th
e
ri
ght
am
plitude
of
th
e
vo
ltage
in
puts
(b
y
no
nreactive
sh
unts
fo
r
th
e
cu
rrent
tr
ansformers
an
d
no
nreactive
vo
ltage
di
vid-
ers
fo
r
th
e
vo
ltage
tr
ansformers)
. A
er
th
e
tr
ansformers,
an
d
re
lated
de
vices,
a se
cond
bl
ock,
ba
sed
on
el
ectronic
am
pliers,
pr
ovides
th
e
n
al
an
alog
pr
ocessing
of th
e
in
put
sig
nals,
as fo
r
th
e
dc co
ndition-
ing systems. It is useful to introduce this second processing element because analog lters are generally
re
quired
w
hen
t
he
i
nput
si
gnals
n
eed
to b ...