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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.
12.5.7
Technical data
M16051-2 v11
Table 273:
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 506 382-UEN A
Section 12
Scheme communication
Line distance protection REL650 2.2 IEC
461
Technical manual
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