ABB RELION REX640 Technical Manual page 1271

1MRS759142 F
Setting guidelines for weak-end infeed logic
The WEI function returns the received carrier signal with the ECHO output when
it receives the carrier signal (CR) if no fault has been detected by forward- and
reverselooking zones and the signal duration is longer than the
coordination time delay setting. Set the
spurious carrier received signals that activate the WEI logic and cause unwanted
communication.
Set the voltage criteria
trip to 70 percent of the system's base voltage. The setting should be below the
minimum operate voltage of the system but above the voltage that occurs for a
fault on the protected feeder. The phase-to-phase elements must be verified not to
operate for the phase-to-earth faults.
5.12.7 Signals
5.12.7.1 CRWPSCH Input signals
Table 1199: CRWPSCH Input signals
Name
U3P
BLOCK
BLK_IRV
BLK_WEI1
BLK_WEI2
IRV
FF
CB_OPEN
CR
CR
REX640
Technical Manual
Wei Crd time = "0.010" s to avoid the
PPV level for Wei and PhV level for Wei for the weak-end
Type Default
SIGNAL -
BOOLEAN 0=False
BOOLEAN 0=False
BOOLEAN 0=False
BOOLEAN 0=False
BOOLEAN 0=False
BOOLEAN 0=False
BOOLEAN 0=False
BOOLEAN 0=False
BOOLEAN 0=False
Protection related functions
Wei Crd time
Description
Three-phase voltages
Block signal for acti-
vating the blocking
mode
Block of current rever-
sal function
Block of WEI Logic
Block of WEI logic due
to operation of other
protections
Activation of current
reversal logic
Block of trip from
WEI logic through
fuse-failure function
Block of trip from
WEI logic by an open
breaker
POR Carrier receive
for WEI logic
POR Carrier signal re-
ceived from remote
end
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