Technical Data - ABB REL650 series Technical Manual

1MRK 506 335-UUS A
12.6.7
Technical manual
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.
BLOCK
WEIBLK1
0
200 ms
CRL
WEI = Echo&Trip
3V0PU
CBOPEN
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.

Technical data

Table 361: ECRWPSCH (85) technical data
Function
Operating mode of WEI logic
Operate voltage 3V for WEI trip
o
Operate time for current reversal
logic
Delay time for current reversal
Coordination time for weak-end
infeed logic
0 200 ms
AND
50 ms
100 ms
AND
Range or value
Disabled
Echo
Echo & Trip
(5-70)% of VBase
(0.000-60.000) s
(0.000-60.000) s
(0.000–60.000) s
Section 12
Scheme communication
AND
0
AND
ANSI09000020-2-en.vsd
Accuracy
-
± 1.0% of Vn
± 0.5% ± 25 ms
± 0.5% ± 25 ms
± 0.5% ± 25 ms
ECHO
TRWEI
527