Phase Selection, Quadrilateral Characteristic With Fixed Angle; Full-Scheme Distance Measuring, Mho Characteristic Zmhpdis - ABB RED670 Product Manual

Line differential protection RED670 ANSI
Customized
Product version: 1.2
X
operation
Reverse
operation
IEC05000034 V1 EN
Figure 7. Typical quadrilateral distance protection zone with load
encroachment function activated
The independent measurement of impedance for each fault loop
together with a sensitive and reliable built in phase selection
makes the function suitable in applications with single phase
auto-reclosing.
Built-in adaptive load compensation algorithm for the
quadrilateral function prevents overreaching of zone1 at load
exporting end at phase to ground-faults on heavily loaded
power lines.
The distance protection zones can operate, independent of
each other, in directional (forward or reverse) or non-directional
mode. This makes them suitable, together with different
communication schemes, for the protection of power lines and
cables in complex network configurations, such as parallel lines,
multi-terminal lines.

Phase selection, quadrilateral characteristic with fixed angle

FDPSPDIS (21)
The operation of transmission networks today is in many cases
close to the stability limit. Due to environmental considerations,
the rate of expansion and reinforcement of the power system is
reduced, for example, difficulties to get permission to build new
power lines. The ability to accurately and reliably classify the
different types of fault, so that single pole tripping and
autoreclosing can be used plays an important role in this
matter.Phase selection, quadrilateral characteristic with fixed
angle FDPSPDIS is designed to accurately select the proper
fault loop in the distance function dependent on the fault type.
The heavy load transfer that is common in many transmission
networks may make fault resistance coverage difficult to
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achieve. Therefore, FDPSPDIS (21) has a built-in algorithm for
load encroachment, which gives the possibility to enlarge the
resistive setting of both the phase selection and the measuring
zones without interfering with the load.
The extensive output signals from the phase selection gives
also important information about faulty phase(s), which can be
used for fault analysis.
A current-based phase selection is also included. The
measuring elements continuously measure three phase currents
and the residual current and, compare them with the set values.

Full-scheme distance measuring, Mho characteristic ZMHPDIS

(21)
The numerical mho line distance protection is a five zone full
scheme protection for back-up detection of short circuit and
ground faults. The full scheme technique provides back-up
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 the highest voltage levels. It is
suitable for the protection of heavily loaded lines and multi-
terminal lines where the requirement for tripping is one-, two-
and/or three-pole.
The independent measurement of impedance for each fault loop
together with a sensitive and reliable built in phase selection
makes the function suitable in applications with single phase
autoreclosing.
Built-in adaptive load compensation algorithm prevents
overreaching at phase-to-ground faults on heavily loaded power
lines, see figure 8.
1MRK505226-BUS D
ABB