ABB RELION RET670 - Distance Measuring Zones, Quadrilateral Characteristic ZMQPDIS 21), ZMQAPDIS (21), ZDRDIR (21 D)

8.3 Distance measuring zones, quadrilateral characteristic
ZMQPDIS (21), ZMQAPDIS (21)
, ZDRDIR (21D)
IP14498-1 v4
8.3.1 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
8.3.2 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
grounded systems)
although it also can be used on distribution levels.
8.3.2.1 System grounding
M17048-9 v4
The type of system grounding plays an important role when designing the protection
system. Some hints with respect to distance protection are highlighted below.
Solidly grounded networks
M17048-12 v6
In solidly grounded systems, the transformer neutrals are connected directly to ground
without any impedance between the transformer neutral and ground.
1MRK 504 163-UUS A Section 8
Impedance protection
Transformer protection RET670 2.2 ANSI 257
Application manual