ABB Relion 650 Series Technical Manual page 107

1MRK 506 326-UUS B
5.3 Five zone distance protection, mho characteristic
ZMOPDIS (21)
5.3.1 Identification
Function description
Five zone distance protection, mho
characteristic
5.3.2 Functionality
The numerical mho line distance protection is a five zone full scheme protection for detection of
short circuit and ground faults. The full scheme technique provides protection of power lines with
high sensitivity and low requirement on remote end communication. The five zones have fully
independent measuring and settings, which gives high flexibility for all types of lines.
The IED can be used up to high voltage levels. It is suitable for the protection of heavily loaded
lines and multi-terminal lines where the requirement for fast three-phase tripping is wanted.
Built-in adaptive load compensation algorithm prevents overreaching at phase-to-ground faults
on heavily loaded power lines, see figure 55.
Operation area
No operation area
IEC07000117 V1 EN-US
Figure 55: Load encroachment influence on the offset mho characteristic
The distance protection zones can operate, independent of each other, in directional (forward or
reverse) or non-directional mode (offset). This makes them suitable, together with different
Line distance protection REL650
Technical manual
IEC 61850
identification
jX
Operation area
R
Operation area
No operation area
en07000117.vsd
© Copyright 2011 ABB Power Grids. All rights reserved
IEC 60617
identification
ZMOPDIS
S00346 V1 EN-US
Section 5
Impedance protection
GUID-5A32CA48-5BDE-4E6F-B48A-78E96637C386 v1
SEMOD154447-2 v2
ANSI/IEEE
C37.2 device
number
21
SEMOD175459-4 v8
101