ABB Relion 670 Series Applications Manual page 449

1MRK 511 401-UEN Rev. K
signal would block the operation of the distance protection at the remote line end and in
this way prevents the correct operation of a complete protection scheme.
• A separate direct intertrip channel must be arranged from the remote end when a trip or
accelerated trip is given there. The intertrip receive signal is connect to input CRL.
• The WEI function shall be set to
phase selection and trip the local breaker.
Avoid using WEI function at both line ends. It shall only be activated at the weak-end.
16.2.3 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 (
power (
GlobalBaseSel : Selects the global base value group used by the function to define IBase , UBase
SBase . Note that this function will only use IBase value.
and
16.2.3.1 Current reversal logic
CurrRev to On to activate the function.
Set
tDelayRev timer of the maximum reset time for the communication equipment that gives
Set
the 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.
16.2.3.2 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
The
to 10 ms, a short delay is recommended to avoid that spurious carrier received signals will
activate WEI and cause unwanted carrier send (ECHO) signals.
Bay control REC670
Application manual
SBase ) are set in global base values for settings function GBASVAL.
The forward zone timer must be set longer than the
tPickUpRev to <80% of the minimum sum of breaker operate time +
When single phase tripping is required, a detailed study of the voltages during
phase-to-phase and phase-to-earth faults should be done, at different fault
locations.
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WEI=Echo&Trip . The WEI function block will then give
IBase ), primary voltage ( UBase ) and primary
tDelayRev with a good margin.
Section 16
Scheme communication
IP15024-1 v1
M13856-4 v6
M13856-6 v7
tDelayRev set value.
M13856-10 v8
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