ABB Relion 670 series REC670 - Page 56

Table 58. Current reversal and weak-end infeed logic for residual overcurrent protection ECRWPSCH
Function Range or value Accuracy
Operating mode of WEI logic Off
Echo
Echo & Trip
-
Operate voltage 3U
o
for WEI trip (5-70)% of UBase ± 0.5% of U
r
Reset ratio >95% -
Operate time for current reversal
logic
(0.000-60.000) s ± 0.5% ± 10 ms
Delay time for current reversal (0.000-60.000) s ± 0.5% ± 10 ms
Coordination time for weak-end
infeed logic
(0.000–60.000) s ± 0.5% ± 10 ms
Bay control REC670
1MRK511232-BEN E
Pre-configured
Product version: 1.2
56 ABB