With the
Echo & Trip
setting, the logic sends an echo according to above. Further, it
activates the TRWEI signal to trip the breaker if the echo conditions are fulfilled and the
neutral point voltage is above the set operate value for
3V0PU
.
The voltage signal that is used to calculate the zero sequence voltage is set in the ground-
fault function that is in operation.
CRL
BLOCK
WEIBLK1
TRWEI
CBOPEN
AND
AND
ECHO
WEI = Echo&Trip
AND
3V0PU
AND
ANSI09000020-2-en.vsd
200 ms
0
0
200 ms
50 ms
0
100 ms
ANSI09000020 V2 EN
Figure 251:
Simplified logic diagram, weak-end infeed - Echo & Trip
The weak-end infeed echo sent to the strong line end has a maximum duration of 200 ms.
When this time period has elapsed, the conditions that enable the echo signal to be sent are
set to zero for a time period greater than 50 ms. This avoids ringing action if the weak-end
echo is selected for both line ends.
12.6.7
Technical data
Table 361:
ECRWPSCH (85) technical data
Function
Range or value
Accuracy
Operating mode of WEI logic
Disabled
Echo
Echo & Trip
-
Operate voltage 3V
o
for WEI trip
(5-70)% of VBase
± 1.0% of Vn
Operate time for current reversal
logic
(0.000-60.000) s
± 0.5% ± 25 ms
Delay time for current reversal
(0.000-60.000) s
± 0.5% ± 25 ms
Coordination time for weak-end
infeed logic
(0.000–60.000) s
± 0.5% ± 25 ms
1MRK 506 335-UUS A
Section 12
Scheme communication
527
Technical manual
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