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7.3
Distance measuring zones, quadrilateral characteristic
ZMQPDIS, ZMQAPDIS, ZDRDIR
IP14498-1 v4
7.3.1
Identification
M14852-1 v6
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Distance protection zone,
quadrilateral characteristic (zone 1)
ZMQPDIS
S00346 V1 EN-US
21
Distance protection zone,
quadrilateral characteristic (zone
2-5)
ZMQAPDIS
S00346 V1 EN-US
21
Directional impedance quadrilateral
ZDRDIR
Z<->
IEC09000167 V1 EN-US
21D
7.3.2
Application
IP14961-1 v2
M17048-3 v7
Sub-transmission networks are being extended and often become more and more complex,
consisting of a high number of multi-circuit and/or multi terminal lines of very different
lengths. These changes in the network will normally impose more stringent demands on the
fault clearing equipment in order to maintain an unchanged or increased security level of the
power system.
The distance protection function in the IED is designed to meet basic requirements for
application on transmission and sub-transmission lines (solid earthed systems) although it
also can be used on distribution levels.
The two inputs I3P — Three phase group signal for current and U3P — Three
phase group signal for voltage, must be connected to non-adaptive SMAI
blocks if ANY OF THE ZONES are set for directional operation. That is, the
parameter
DFTReference in used SMAI must be set to InternalDFTRef. If
adaptive SMAI block is used this might result in a wrong directional and reach
evaluation.
7.3.2.1
System earthing
M17048-9 v4
The type of system earthing plays an important role when designing the protection system.
Some hints with respect to distance protection are highlighted below.
Solidly earthed networks
M17048-12 v6
In solidly earthed systems, the transformer neutrals are connected directly to earth without
any impedance between the transformer neutral and earth.
1MRK 505 343-UEN B
Section 7
Impedance protection
197
Application manual
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