ABB Relion 670 series - Identification; Application; System Grounding

8.9.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Distance protection zone, quadrilateral
characteristic, separate settings (zone
1)
ZMRPDIS
S00346 V1 EN
21
Distance protection zone, quadrilateral
characteristic, separate settings (zone
2-5)
ZMRAPDIS
S00346 V1 EN
21
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional impedance quadrilateral ZDRDIR Z<-> 21D
8.9.2 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 although it also can be used on
distribution levels.
8.9.2.1 System grounding
The type of system grounding plays an important role when designing the protection
system. Some hints with respect to distance protection are highlighted below.
Solid grounded networks
In solidly grounded systems, the transformer neutrals are connected solidly to ground
without any impedance between the transformer neutral and ground.
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 309
Application manual