Functions
6-53
7SA522 Manual
C53000-G1176-C119-2
For the first zone, Z1, an additional tilt
α
(figure 6-25) can be set by means of the pa-
rameter in address
. This setting is required if short circuits
with a large fault resistance (e.g. overhead lines without earth/shield wire) are expect-
ed on lines with an infeed at both ends and load transfer in the direction of the line (ex-
port).
Different delay times can be set for single- and multiple-phase faults in the first zone:
(address
) and
(address
). The first zone
is typically set to operate without additional time delay.
The corresponding parameters for the higher zones are:
5=
(address
),
;=
(address
),
5(=
(address
);
5=
(address
),
;=
(address
),
5(=
(address
);
5=
(address
),
;=
(address
),
5(=
(address
);
5=
(address
),
;=
(address
) for forward direction, X-
=
) for reverse direction,
5(=
(address
);
For the second zone it is also possible to set separate delay times for single- and multi-
phase faults. In general the delay times are set the same. If stability problems are ex-
pected during multiple-phase faults, a shorter time delay
(address
) may be considered under the given circumstances while a higher setting for
(address
) for single-phase faults may be tolerated.
The zone timers for the remaining zones are set with the parameters
(ad-
dress
),
(address
) and
(address
).
If the device is provided with the capability to trip single-pole, single-pole tripping is
then possible in the zones Z1 and Z2. While single-pole tripping then usually applies
to single-phase faults in Z1(if the other conditions for single-pole tripping are satisfied),
this may also be selected for the second zone with address
Single pole tripping in zone 2 is only possible if this address is set to
<(6
The pre-
setting is
12
.
Controlled Zone
Z1B
The overreaching zone Z1B is a controlled zone. The normal zones Z1 to Z5 are not
influenced by Z1B. There is therefore no zone switching, but rather the overreaching
zone is activated or deactivated by the corresponding criteria. Z1B can also be select-
ed in address
to be
=
)RUZDUG
,
5HYHUVH
or
1RQ'LUHF
WLRQDO
. If this stage is not required, it is set to
,QDFWLYH
in address
. The set-
ting options are similar to those of zone Z1: address
, address
, address
. The delay times for single-phase and
multiple-phase faults can again be set separately:
(address
) and
(address
).
Note:
For fast tripping (undelayed) in the forward direction the first zone Z1 should always
be used, as only the Z1 and Z1B are guaranteed to trip with the shortest operating
time of the device. The further zones should be used sequentially for grading in the
forward direction.
If fast tripping (undelayed) is required in the reverse direction, the zone Z3 should be
used for this purpose, as only this zone is guaranteed to trip with the shortest device
operating time for faults in the reverse direction. Zone Z3 is also recommended as re-
verse looking zone in teleprotection Blocking schemes.
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