en05000034.vsd
R
X
Forward
operation
Reverse
operation
IEC05000034 V1 EN
Figure 156: Typical quadrilateral distance protection zone with Phase selection,
quadrilateral characteristic with settable angle function FRPSPDIS (21)
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 pole tripping and autoreclosing.
Built-in adaptive load compensation algorithm prevents overreaching of zone 1 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 and so on.
6.9.2 Principle of operation
6.9.2.1 Full scheme measurement
The execution of the different fault loops within the IED are of full scheme type, which
means that each fault loop for phase-to-ground faults and phase-to-phase faults for
forward and reverse faults are executed in parallel.
Figure
74 presents an outline of the different measuring loops for up to five, impedance-
measuring zones. There are 3 to 5 zones depending on product type and variant.
1MRK505222-UUS C Section 6
Impedance protection
305
Technical reference manual
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