Distance Measuring Zones, Quadrilateral Characteristic Zmqpdis, Zmqapdis, Zdrdir; Identification; Application; System Earthing - ABB RELION 670 Series Applications Manual

1MRK 504 152-UEN B
7.3 Distance measuring zones, quadrilateral characteristic
ZMQPDIS, ZMQAPDIS, ZDRDIR
7.3.1

Identification

Function description
Distance protection zone,
quadrilateral characteristic (zone 1)
Distance protection zone,
quadrilateral characteristic (zone
2-5)
Directional impedance quadrilateral
7.3.2

Application

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.
7.3.2.1

System earthing

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
In solidly earthed systems, the transformer neutrals are connected directly to earth without
any impedance between the transformer neutral and earth.
Application manual
IEC 61850
identification
ZMQPDIS
ZMQAPDIS
ZDRDIR
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
DFTReference in used SMAI must be set to InternalDFTRef . If
parameter
adaptive SMAI block is used this might result in a wrong directional and reach
evaluation.
IEC 60617 ANSI/IEEE C37.2
identification device number
21
S00346 V1 EN-US
21
S00346 V1 EN-US
21D
Z<->
IEC09000167 V1 EN-US
Section 7
Impedance protection
IP14498-1 v4
M14852-1 v6
IP14961-1 v2
M17048-3 v7
M17048-9 v4
M17048-12 v6
197