ABB REL670 2.2 IEC - High Speed Distance Protection for Series Compensated Lines ZMFCPDIS

ZMax
Estimated maximum impedance value. An impedance that is higher than ZMax has
the quality attribute as “Out of Range”.
ZMin
Estimated minimum impedance value. An impedance that is lower than ZMin has
the quality attribute as “Out of Range”.
8.13 High speed distance protection for series
compensated lines ZMFCPDIS
GUID-ED71CF5A-1453-4F2F-9C64-3A73C59EA948 v4
8.13.1 Identification
GUID-0F03DA72-0687-4762-91CB-EC8E59B86E06 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
High speed distance protection zone
(zone 1-6)
ZMFCPDIS
S00346 V1 EN-US
21
8.13.2 Application
IP14961-1 v2
GUID-12188AB4-5922-428B-86F5-5F3897D29807 v4
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 high speed distance protection function (ZMFCPDIS) in the IED is designed to
provide sub-cycle, down to half-cycle operate time for basic faults. At the same
time, it is specifically designed for extra care during difficult conditions in high
voltage transmission networks, like faults on long heavily loaded lines and faults
generating heavily distorted signals. These faults are handled with utmost security
and dependability, although sometimes with reduced operating speed.
8.13.2.1 System earthing
GUID-FC9BF10E-8CA1-4B23-887D-2EAB6A2A0A6E v1
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
GUID-6870F6A8-EB28-47CF-AF26-7CE758BF934E v1
In solidly earthed systems, the transformer neutrals are connected directly to earth
without any impedance between the transformer neutral and earth.
1MRK 506 369-UEN B Section 8
Impedance protection
Line distance protection REL670 2.2 IEC 359
Application manual