ABB Relion 670 Series Applications Manual page 422

Section 15
Scheme communication
Avoid using WEI function at both line ends. It shall only be activated at the weak-end.
15.2.3 Setting guidelines
The parameters for the current reversal logic and the weak-end infeed logic (WEI) function are set
via the local HMI or PCM600.
Common base IED values for the primary current (
SBase ) are set in global base values for settings function GBASVAL.
power (
GlobalBaseSel : Selects the global base value group used by the function to define IBase , VBase and
SBase . Note that this function will only use IBase value.
15.2.3.1 Current reversal logic
CurrRev to Enabled to activate the function.
Set
tDelayRev timer of the maximum reset time for the communication equipment that gives the
Set
carrier receive (CRL) signal plus 30 ms. A minimum setting of 40 ms is recommended, typical 60
ms.
tDelayRev setting increases security against unwanted tripping, but delays the fault
A long
clearing time in case of a fault from one line that evolves to the other one. The probability of this
type of fault is small. Therefore set
Set the pick-up delay
communication delay time, but with a minimum of 20 ms.
15.2.3.2 Weak-end infeed logic
Set WEI to Echo , to activate the weak-end infeed function with only echo function.
WEI to Echo&Trip to obtain echo with trip.
Set
tPickUpWEI is the on-time delay to activate the weak-end infeed function. Set tPickUpWEI to
The
10 ms, a short delay is recommended to avoid that spurious carrier received signals will activate
WEI and cause unwanted carrier send (ECHO) signals.
416
The forward zone timer must be set longer than the
tDelayRev with a good margin.
tPickUpRev to <80% of the minimum sum of breaker operate time +
When single pole tripping is required, a detailed study of the voltages during
phase-to-phase and phase-to-ground faults should be done, at different fault
locations.
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IBase ), primary voltage ( VBase ) and primary
tDelayRev set value.
1MRK 511 401-UUS F
IP15024-1 v1
M13856-4 v6
M13856-6 v7
M13856-10 v8
Bay control REC670
Application manual