Setting Of Zone 1 - ABB REL670 2.2 IEC Applications Manual

Section 8
Impedance protection
8.4.3.2
8.4.3.3
8.4.3.4
250
The setting values of all parameters that belong to ZMHPDIS must correspond to
the parameters of the protected line and be coordinated to the selectivity plan for
the network.
Use different setting groups for the cases when the parallel line is in operation, out
of service and not earthed and out of service and earthed in both ends. In this way it
is possible to optimize the settings for each system condition.
Appropriate selection of zero sequence compensation factor KNMagx and KNAngx
(where x=1-5) when parallel line can be in service, out of service, or out of service
and earthed at both ends.
When Directional impedance element for mho characteristic
(ZDMRDIR) is used together with Fullscheme distance protection,
mho characteristic (ZMHPDIS) the following settings for parameter
DirEvalType in ZDMRDIR is vital:
• alternative Comparator is strongly recommended
• alternative Imp/Comp should generally not be used
• alternative Impedance should not be used. This alternative is
intended for use together with Distance protection zone,
quadrilateral characteristic (ZMQPDIS)

Setting of zone 1

The zone 1 distance elements must be set to underreach a protected circuit to
ensure external fault security.
The different errors mentioned earlier usually require a limitation of the
underreaching zone (normally zone 1) to 75 - 90% of the protected line.
In case of parallel lines, consider the influence of the mutual coupling according to
section "Setting of zones for parallel line application" and select the case(s) /
options that are valid in the particular application.
By proper setting it is possible to compensate for the cases when the parallel line is
in operation, out of service and not earthed and out of service and earthed in both
ends.
Setting of overreaching zone
Setting of zone 2
Zone 2 distance elements must be set according to the following criteria:
1MRK 506 369-UEN B
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Line distance protection REL670 2.2 IEC
Application manual