Table 57. 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
± 1.0% 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
Logic
Table 58. Tripping logic SMPPTRC
Function
Range or value
Accuracy
Trip action
3-ph, 1/3-ph, 1/2/3-ph
-
Minimum trip pulse length (0.000-60.000) s
± 0.5% ± 10 ms
Timers
(0.000-60.000) s
± 0.5% ± 10 ms
Transformer protection RET670
1MRK 504 091-BEN B
Pre-configured
Product version: 1.1
Issued: June 2010
74
ABB
Содержание RELION RET670
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