ABB Relion 650 Series Technical Manual page 366

Section 11
Scheme communication
BLOCK
WEIBLK1
CRL
IEC09000032 V1 EN-US
Figure 194: Simplified logic diagram, weak-end infeed - Echo
With 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
The voltage signal that is used to calculate the zero sequence voltage is set in the ground-fault
function that is in operation.
BLOCK
WEIBLK1
CRL
WEI = Echo&Trip
ST3U0
CBOPEN
IEC09000020 V1 EN-US
Figure 195: 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 of 50 ms. This avoids ringing action if the weak-end echo is selected for both line
ends.
11.5.7 Technical data
Table 296: ECRWPSCH (85) technical data
Function
Operating mode of WEI logic
Operate voltage 3V
trip
Operate time for current
reversal logic
Delay time for current reversal
Coordination time for weak-
end infeed logic
360
200 ms
t
WEI = Echo
Echo & Trip setting, the logic sends an echo according to above. Further, it activates the
3V0PU .
200 ms
t
AND
Range or value
Disabled
Echo
Echo & Trip
for WEI (5-70)% of VBase
o
(0.000-60.000) s
(0.000-60.000) s
(0.000–60.000) s
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50 ms 200 ms
&
t
t
50 ms 200 ms
AND
t
t
AND
AND
Accuracy
ECHO
AND
IEC09000032-1-en.vsd
ECHO
TRWEI
IEC09000020-1-en.vsd
-
± 1.0% of Vn
± 0.5% ± 25 ms
± 0.5% ± 25 ms
± 0.5% ± 25 ms
Line distance protection REL650
1MRK 506 326-UUS B
M16051-2 v7
Technical manual