Setting Guidelines - ABB REC670 Applications Manual

Section 15
Scheme communication
15.2.3
15.2.3.1
476
when zone 1 is not available, weak-end infeed tripping logic is used. The weak end
infeed function only works together with permissive overreach communication
schemes as the carrier send signal must cover the complete line length.
The WEI function sends back (echoes) the received signal under the condition that no
fault has been detected on the weak-end by different fault detection elements (distance
protection in forward and reverse direction).
Also, the WEI function can be extended to trip the breaker in the weak side. The trip is
achieved when one or more phase voltages are low during an echo function.
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 WEI=Echo&Trip. The WEI function block will
then give phase selection and trip the local breaker.
Avoid using WEI function at both line ends. It shall only be activated at the weak-end.

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 (IBase), primary voltage (VBase) and
primary power (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.
Current reversal logic
Set CurrRev to Enabled to activate the function.
1MRK 511 401-UUS A
IP15024-1 v1
M13856-4 v5
M13856-6 v6
Bay control REC670 2.2 ANSI
Application manual