ABB RELION RED670 Series Product Manual page 32

Line differential protection RED670 2.2
Product version: 2.2
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 earth-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
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
achieve. Therefore, FDPSPDIS 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
The numerical mho line distance protection is an up to five
(depending on product variant) zone full scheme protection of
short circuit and earth faults.
The 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.
32
The independent measurement of impedance for each fault
loop together with a sensitive and reliable phase selection
makes the function suitable in applications with single phase
autoreclosing.
Built-in selectable zone timer logic is also provided in the
function.
Adaptive load compensation algorithm prevents overreaching
at phase-to-earth faults on heavily loaded power lines, see
Figure 13.
Operation area
M13139-3 v9
Operation area
No operation area
IEC07000117 V2 EN-US
Figure 13. 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 communication schemes, for the protection of
power lines and cables in complex network configurations,
such as parallel lines, multi-terminal lines and so on.
The possibility to use the phase-to-earth quadrilateral
impedance characteristic together with the mho characteristic
increases the possibility to overcome eventual lack of
sensitivity of the mho element due to the shaping of the curve
at remote end faults.
The integrated control and monitoring functions offer effective
solutions for operating and monitoring all types of
transmission and sub-transmission lines.
SEMOD175459-4 v12
Full-scheme distance protection, quadrilateral for earth faults
ZMMPDIS, ZMMAPDIS
The line distance protection is an up to five (depending on
product variant) zone full scheme protection function with
three fault loops for phase-to-earth fault for each of the
independent zones. Individual settings for each zone resistive
and reactive reach give flexibility for use on overhead lines
and cables of different types and lengths.
The Full-scheme distance protection, quadrilateral for earth
fault functions have functionality for load encroachment,
1MRK 505 379-BEN C
jX
Operation area
R
No operation area
IEC07000117-2-en.vsd
SEMOD154544-4 v7
ABB