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ABB Modures LZ92-1 - Page 21

ABB Modures LZ92-1
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The
zone
reactances
x.
can
now
be
calculated:
1
x.
=
XLi •
kx
1
xl
=
0.267
Ohm,
x2
=
0.4
Ohm,
x3
=
0.533
Ohm
Calculating
the
setting
factors
m.
and
N.
---------------------------------%------%
The
factors
m.
and
N.
can
be
calculated
from
the
following
formula
by
inser-
ting
the
reactances
-l.
and
the
relay
ratings:
1
x.
1
where
H
rn.
1
N.
J_
i
H
100
=--
m.·
---·-
I
1
N.
N
1
(1)
factor
depending
on
the
rated
voltage,
H = 1
for
UN
=
100
to
130
V
H = 2
for
UN
200
to
260 V
(see
ordering
code
U
.•
on
the
rating
label)
relay
rated
current
1 A, 2 A, 5 A
(see
ordering
code
A
..
on
the
rating
label)
impedance
measuring
range
(see
Table
3.13)
"percentage"
impedance
setting
for
the
distance
zones
index
denoting
the
distance
zone,
i = 1
for
zone
1
etc.
The
quotient
H/IN
takes
the
relay
ratings
into
account,
so
that
the
same
setting
formula
can
be
used
for
all
the
relays.
The
setting
range
m
can
be
set
individually
for
each
of
the
zones
on
the
frontplate
of
the
KI91,
KZ91
respectively
KZ91-1
(see
Table
3.13
and
Figures
9.
5
to
9.
8) .
-·
Switch
m.
setting
I
II
III
1
ml
0.1 0.5
5
m2
or
m
3
0.1
1 10
-
Table
3.13
-
Values
of
the
factor
m
for
zones
1
to
3
represented
by
the
settings
of
switch
m.
1
The
percentage
N
can
also
be
set
from
0
to
99
in
steps
of
1
individually
for
each
zone.
The
reciprocal
setting
has
the
advantage
of
a
fine
setting
for
short
zones.
The
m
setting
should
permit
N
to
be
set
as
accurately
as
possible,
i.e.
the
value
of
N
should
be
as
high
as
possible.
An
N
of
100
is
therefore
inserted
initially
in
order
to
determine
the
best
setting
range
m.
19

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