ABB RELION 670 Series Product Manual page 100

Transformer protection RET670 2.1 IEC
Scheme communication
Table 79. Scheme communication logic for residual overcurrent protection ECPSCH
Function
Scheme type
Communication scheme
coordination time
Table 80. Current reversal and weak-end infeed logic for residual overcurrent protection ECRWPSCH
Function
Operate mode of WEI logic
Operate voltage 3U0 for WEI
trip
Operate time for current
reversal logic
Delay time for current reversal
Coordination time for weak-
end infeed logic
100
M16049-1 v9
Range or value
Permissive Underreaching
Permissive Overreaching
Blocking
(0.000-60.000) s
M16051-2 v11
Range or value
Off
Echo
Echo & Trip
(5-70)% of UBase
(0.000-60.000) s
(0.000-60.000) s
(0.000–60.000) s
Accuracy
-
±0.2% or ±20 ms whichever is greater
Accuracy
-
±0.5% of U
r
±0.2% or ±30 ms whichever is greater
±0.2% or ±30 ms whichever is greater
±0.2% or ±30 ms whichever is greater
1MRK 504 155-BEN F
ABB