Scheme Communication; Scheme Communication Logic For Residual Overcurrent Protection - ABB RET670 Product Manual

Transformer protection RET670 2.0
Product version: 2.0

Scheme communication

Table 73. Scheme communication logic for residual overcurrent protection ECPSCH
Function
Scheme type
Communication scheme
coordination time
Table 74. 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
ABB
Range or value
Permissive Underreaching
Permissive Overreaching
Blocking
(0.000-60.000) s
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 504 141-BEN C
85