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.
13.5.7 Technical data
M16051-2 v11
Table 248: ECRWPSCH technical data
Function Range or value Accuracy
Operate mode of WEI logic Off
Echo
Echo & Trip
-
Operate voltage 3U0 for WEI trip (5-70)% of UBase ±0.5% of U
r
Operate time for current reversal
logic
(0.000-60.000) s ±0.2% or ±30 ms whichever
is greater
Delay time for current reversal (0.000-60.000) s ±0.2% or ±30 ms whichever
is greater
Coordination time for weak-end
infeed logic
(0.000–60.000) s ±0.2% or ±30 ms whichever
is greater
1MRK 505 394-UEN A Section 13
Scheme communication
Line differential protection RED650 2.2 IEC 429
Technical manual
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