Hitachi Relion REL670 Product Manual page 37

Line distance protection REL670
Version 2.2
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 10.
X
Reverse
operation
IEC05000034 V1 EN-US
Figure 10. Typical quadrilateral distance protection zone with Phase
selection, quadrilateral characteristic with settable angle
function FRPSPDIS 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.
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.
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Forward
operation
R
en05000034.vsd
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Directional impedance element for Mho characteristic
ZDMRDIR
The phase-to-earth impedance elements can be optionally
supervised by a phase unselective directional function
(phase unselective, because it is based on symmetrical
components).
Mho impedance supervision logic ZSMGAPC
The Mho impedance supervision logic (ZSMGAPC) includes
features for fault inception detection and high SIR detection.
It also includes the functionality for loss of potential logic as
well as for the pilot channel blocking scheme.
ZSMGAPC can mainly be decomposed in two different
SEMOD154544-4 v7
parts:
1. A fault inception detection logic
2. High SIR detection logic
Faulty phase identification with load encroachment
FMPSPDIS
The ability to accurately and reliably classify different types
of fault so that single phase tripping and autoreclosing can
be used plays an important roll in today's power systems.
The phase selection function is design to accurately select
the proper fault loop(s) in the distance function dependent
on the fault type.
The heavy load transfer that is common in many
transmission networks may in some cases interfere with the
distance protection zone reach and cause unwanted
operation. Therefore the function has a built in algorithm for
load encroachment, which gives the possibility to enlarge
the resistive setting of the measuring zones without
interfering with the load.
The output signals from the phase selection function
produce important information about faulty phase(s), which
can be used for fault analysis as well.
Distance measuring zone, quad characteristic
separate Ph-Ph and Ph-E settings ZMRPDIS,
ZMRAPDIS
The line distance protection is up to five 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 in
resistive and reactive reach gives flexibility for use as back-
up protection for transformer connected to overhead lines
and cables of different types and lengths.
Mho alternative quadrilateral characteristic is available.
Distance protection zone, quadrilateral characteristic
(ZMRPDIS) together with Phase selection, quadrilateral
characteristic with settable angle (FRPSPDIS) has
functionality for load encroachment, which increases the
1MRK 506 372-BEN Q
SEMOD175532-4 v2
SEMOD153843-5 v3
SEMOD153825-5 v7
GUID-014501E7-EE0D-440F-8DC8-C44B848E49D3 v4
37