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ABB Modures LZ92-1 - WIRING VERIFICATION CHECKS; CT CONNECTIONS

ABB Modures LZ92-1
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5.
INSTALLATION
AND
WIRING
5.1
Relay
location
and
ambient
conditions
Since
every
piece
of
technical
equipment
can
be
damaged
or
destroyed
by
inadmis-
sible
ambient
conditions,
the
relay
location
should
not
be
exposed
to
excessive
air
pollution
(dust,
aggressive
substances)
-
severe
vibration,
extreme
changes
of
temperature,
high
levels
of
humidity,
surge
voltages
of
high
arnpli
tude
and
short
rise
time
and
powerful
magnetic
fields
should
be
avoided
as
far
as
possible.
In
any
event
it
is
essential
for
the
limits
and
ranges
given
in
the
section
"General
Data"
of
the
corresponding
Data
Sheet
to
be
observed.
5.2
Checking
the
wiring
-
Check
that
the
relay
has
been
wired
in
strict
accordance
with
the
correspon-
ding
wiring
diagram
(see
appendicies).
-
Check
that
the
phase
references
of
c.t.
and
p.t.
connections
correspond.
-
Check
that
the
ratings
of
c.t's,
p.t's
and
auxiliary
supply
agree
with
the
those
of
the
relay
(EW91,
DC/DC
converter
and
optp-coupler
unit).
-
Check
that
the
same
phase
is
used
as
R
phase
in
all
the
stations.
-
Check
that
the
phase-sequence
is
correctly
R-S-T.
5.3
C.t.
connections
Generally
the
c.t's
are
wound
in
the
sense
and
have
the
terminal
designations
shown
in
Fig.
5
.1.
With
the
normal
arrangement
of
K
connected
towards
the
busbar
and
L
towards
the
line,
the
secondary
terminals
k
and
1
are
connected
in
strict
accordance
with
the
wiring
diagram.
Should
the
primary
of
a
winding
be
connected
in
the
reverse
sense,
i.e.
L
towards
the
busbar
and
K
towards
the
line,
the
secondary
connections
to
the
terminals
k
and
1
must
also
be
reversed.
Should
there
be
any
doubt
as
to
the
sense
of
any
of
the
windings,
the
following
method
can
be
used
to
determine
the
polarity
of
the
secondaries.
Terminals
K
and
L
are
connected
to
a
d.c.
source
of
about
4 V
and
k
and
1
to
a
polarized
voltmeter
as
shown
in
Fig.
5.1.
The
polarity
is
correct,
if
there
is
a
positive
deflection
when
the
switch
S
is
closed.
27

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