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The zones can operate independently of each other. Zones 3 to 5 in directional (forward or reverse)
or non-directional mode. Zone1 and zone2 are designed to measure in forward direction only,
while one zone (ZRV) is designed to measure in the reverse direction. This makes them suitable,
together with a communication scheme, for protection of power lines and cables in complex
network configurations, such as parallel lines, multi-terminal lines, and so on.
A built-in adaptive load compensation algorithm prevents overreaching of the distance zones in
the load exporting end during phase-to-ground faults on heavily loaded power lines. It also
reduces underreach in the importing end.
The ZMFPDIS function block itself incorporates a phase-selection element and a directional
element, contrary to previous designs in the 600-series, where these elements were represented
with separate function-blocks.
The operation of the phase-selection element is primarily based on current change criteria (i.e.
delta quantities), with significantly increased dependability. Naturally, there is also a phase
selection criterion operating in parallel which bases its operation only on voltage and current
phasors.
The directional element utilizes a set of well-established quantities to provide fast and correct
directional decision during various power system operating conditions, including close-in three-
phase faults, simultaneous faults and faults with only zero-sequence in-feed.
Section 7
1MRK 502 066-UUS B
Impedance protection
292
Technical manual
Содержание Relion 670 series
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