Zone 2 phase to ground loop gives trip.
7. Set OpModetPPZ2 to Enabled.
Zone 2 phase to phase loop gives trip.
8. Set time delays to trip.
Zone 2 phase to ground loops gives trip
8.1. Set tPPZ2 to 0.400 s
Zone 2 phase to phase loop gives trip after a short delay.
8.2. Set tPEZ2 to 0.400 s
Zone 2 phase to ground loop gives trip after a short delay.
TimerSelZx is set to Timers seperated but can be set to other options as explained in
Calculating settings for zone 1.
Choose the time delay for zone 2 with margin to assure selectivity to zone 1 of
adjacent lines. A delay time difference of 0.4 s between the zones is sufficient. The
time delay for zone 2 is therefore chosen to 0 s (delay zone 1) + 0.4 s.
3.1.3.4 Calculating settings for zone 3
Zone 3 should preferably be set so that the required back-up zones are covered. See figure
10.
Zone 1
Zone 2
Zone 3
Zone 4
Zone 1
REL 650
REL 650
Z 1 = R 1 + jX 1
Z 0 = R 0 + jX0
A B
Y
Y
C
ANSI11000110_1_en.vsd
ANSI11000110 V1 EN
Figure 10: Impedance zones reach for zone 3
The reach of zone 3 might come into conflict with the apparent impedance due to the
maximum load current out on the line. This current mainly influences the resistive reach.
In order to prevent unwanted operation due to the load current, the load encroachment
function with quadrilateral characteristic (FMPSPDIS) (setting below) is used.
1MRK 506 334-UUS A Section 3
REL650 setting examples
53
Application manual
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