Full-Scheme Distance Protection, Quadrilateral For Earth Faults Zmmpdis (21), Zmmapdis (21); Zmmpdis (21), Zmmapdis (21); Application - ABB RET670 Applications Manual

1MRK504116-UUS C
3.6.5
3.6.5.1
Application manual
Full-scheme distance protection, quadrilateral for earth faults

ZMMPDIS (21), ZMMAPDIS (21)

Function description
Fullscheme distance protection,
quadrilateral for earth faults (zone 1)
Fullscheme distance protection,
quadrilateral for earth faults (zone 2-5)

Application

Introduction
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 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.
System grounding
The type of system grounding plays an important roll when designing the protection
system. In the following some hints with respect to distance protection are highlighted.
Solid grounded networks
In solid grounded systems the transformer neutrals are connected solidly to ground
without any impedance between the transformer neutral and ground.
IEC 61850 IEC 60617
identification identification
ZMMPDIS
S00346 V1 EN
ZMMAPDIS
S00346 V1 EN
Section 3
IED application
ANSI/IEEE C37.2
device number
21
21
283