Quadrilateral characteristic is available.
Distance measuring zone, quadrilateral characteristic
for series compensated lines (ZMCPDIS) function has
functionality for load encroachment which increases the
possibility to detect high resistive faults on heavily
loaded lines.
en05000034.vsd
R
X
Forward
operation
Reverse
operation
IEC05000034 V1 EN-US
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
M13139-3 v9
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
SEMOD175459-4 v12
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.
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.
Line differential protection RED670
1MRK 505 379-BEN N
Hitachi Power Grids 33
© Copyright 2017 Hitachi Power Grids. All rights reserved
To Next Page
Loading...
