Identification; Application; System Grounding - ABB RELION 670 SERIES Applications Manual

1MRK 506 369-UUS -
8.9.1
8.9.2
8.9.2.1
Line distance protection REL670 2.2 ANSI
Application manual

Identification

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

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.

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.
Impedance protection
IEC 61850 IEC 60617
identification identification
ZMRPDIS
S00346 V1 EN
ZMRAPDIS
S00346 V1 EN
IEC 61850 IEC 60617
identification identification
ZDRDIR Z<->
Section 8
ANSI/IEEE C37.2
device number
21
21
ANSI/IEEE C37.2
device number
21D
309