ABB RET670 - Scheme Communication Logic for Residual Overcurrent Protection; Scheme Communication

Scheme communication
Table 73. Scheme communication logic for residual overcurrent protection ECPSCH
Function Range or value Accuracy
Scheme type Permissive Underreaching
Permissive Overreaching
Blocking
-
Communication scheme
coordination time
(0.000-60.000) s ±0.2% or ±20 ms whichever is greater
Table 74. Current reversal and weak-end infeed logic for residual overcurrent protection ECRWPSCH
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
Transformer protection RET670 2.0
1MRK 504 141-BEN C
Product version: 2.0
ABB 85