ABB RED670 Product Manual page 25

Line differential protection RED670 2.1 IEC
Product version: 2.1
X
Reverse
operation
IEC05000034 V1 EN
Figure 11. Typical quadrilateral distance protection zone with Phase
selection with load encroachment function FDPSPDIS
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 autoreclosing.
Built-in adaptive load compensation algorithm prevents
overreaching of zone 1 at load exporting end at phase-to-earth
faults on heavily loaded power lines.
The distance protection zones can operate independently 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.
Distance measuring zone, quadrilateral characteristic for
series compensated lines ZMCPDIS, ZMCAPDIS
The line distance protection is a five three zone full scheme
protection with three fault loops for phase-to-phase faults and
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.
Quadrilateral characteristic is available.
ZMCPDIS function has functionality for load encroachment
which increases the possibility to detect high resistive faults on
heavily loaded lines.
ABB
Forward
operation
R
en05000034.vsd
X
Reverse
operation
IEC05000034 V1 EN
Figure 12. 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 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.
1MRK 505 346-BEN -
Forward
operation
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en05000034.vsd
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