en05000034.vsd
R
X
Forward
operation
Reverse
operation
IEC05000034 V1 EN
Figure 87:
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 ground-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.
6.2.2
Principle of operation
6.2.2.1
Full scheme measurement
The execution of the different fault loops within the IED are of full scheme type, which
means that ground fault loop for phase-to-ground faults and phase-to-phase faults for
forward and reverse faults are executed in parallel.
presents an outline of the different measuring loops for the basic five,
impedance-measuring zones.
Section 6
1MRK505222-UUS C
Impedance protection
196
Technical reference manual
Summary of Contents for Relion 670 series
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