ABB REL670 Product Manual page 27

Line distance protection REL670 2.2
Product version: 2.2
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. Each zone is an
individual function block available for independent configuration
in ACT.
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 phase selection
makes the function suitable in applications with single phase
autoreclosing.
ABB
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 9.
Load compensation algorithm prevents overreaching at phase-
to-earth faults on heavily loaded power lines, see Figure 9. This
Load encroachment characteristic is taken from the FMPSPDIS
function.
jX
Operation area Operation area
Operation area
No operation area No operation area
IEC07000117-2-en.vsd
IEC07000117 V2 EN
Figure 9. 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 integrated control and monitoring functions offer effective
solutions for operating and monitoring all types of transmission
and sub-transmission lines.
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, which
increases the possibility to detect high resistive faults on heavily
loaded lines , see Figure 7.
1MRK 506 372-BEN -
R
27