ABB REL 551-C1*2.5 - Technical Data

61
Line differential protection, phase segregated
(DIFL)
Chapter 4
Line differential protection
Path in local HMI-tree: Configuration/TerminalCom/RemTermCom
Table 72: Setting parameters for remote terminal communication
Path in local HMI-tree: Configuration/DiffFunction
Table 73: Setting parameter for synchronisation of the local clocks
1.7 Technical data
Table 74: DIFL - Line differential protection, phase segregated
Parameter Range Default Unit Description
AsymDelay 0.00 - 5.00
Step: 0.01
0.00 ms Asymmetric delay for line differential
Parameter Range Default Unit Description
DiffSync Master,
Slave
Master - Select if the terminal shall be Master
or Slave
Function Setting range Accuracy
Current scaling, CTFactor (0.40-1.00) in steps of 0.01 -
Minimum operate current, IMinOp (20-150) % of (CTFactor x I
r
) in steps
of 1%
±10% of I
r
at I ≤I
r
±10% of I at I >I
r
Slope 1 (20-150) % of I
bias
in steps of 1% ±5%
Slope 2 (30-150) % of I
bias
in steps of 1% ±5%
Slope 1/Slope 2 intersection (100-1000) % of (CTFactor x I
r
) in
steps of 1%
±10% of I
r
at I ≤I
r
±10% of I at I>I
r
Slope at saturation 1.60 x I
bias
±5%
Saturation min current (100-1000) % of (CTFactor x I
r
) in
steps of 1%
±10% of I
r
at I ≤I
r
±10% of I at I >I
r
Function Value
Operate
time
I
diff
> 2 x I
bias
and I
diff
>4
x IMinOp
Typical 28 ms
Reset time at I
diff
= 0 Max 55 ms
Transfer trip operate time Max 35 ms