ABB Relion 670 Series Applications Manual page 396

Section 14
Scheme communication
In case of single-pole tripping, the phase voltages are used as phase selectors together with the
received signal CRLn.
Together with the blocking teleprotection scheme some limitations apply:
• Only the trip part of the function can be used together with the blocking scheme. It is not
possible to use the echo function to send the echo signal to the remote line IED. The echo
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 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
selection and trip the local breaker.
Avoid using WEI function at both line ends. It shall only be activated at the weak-end.
14.2.3 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 primary current (
SBase ) are set in a Global base values for settings function GBASVAL.
(
GlobalBaseSel : It is used to select a GBASVAL function for reference of base values.
14.2.3.1 Current reversal logic
CurrRev to Enabled to activate the function.
Set
tDelayRev timer at 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 delay the fault clearing
A long
in case of a fault developing 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
ms.
14.2.3.2 Weak-end infeed logic
WEI to Echo , to activate the weak-end infeed function with only echo function.
Set
WEI to Echo&Trip to obtain echo with trip.
Set
Set tPickUpWEI 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.
Set the voltage criterion
voltage
the voltage that occurs for fault on the protected line. The phase-to-phase elements must be
verified to not operate for phase to ground faults.
390
tPickUpRev to <80% of the breaker operate time, but with a minimum of 20
PU27PP and PU27PN for the weak-end trip to 70% of the system base
VBase . The setting should be below the minimum operate voltage of the system but above
WEI=Echo&Trip . The WEI function block will then give phase
IBase ), primary voltage ( VBase ) and primary power
tDelayRev with a good margin.
1MRK 511 358-UUS A
IP15024-1 v1
M13856-4 v5
M13856-6 v5
M13856-10 v6
Application manual