Signals - ABB RELION REX640 Technical Manual

1MRS759142 C
5.12.7
REX640
Technical Manual
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 reverse-
looking zones and the signal duration is longer than the Wei Crd time coordination
time delay setting. Set the Wei Crd time = "0.010" s to avoid the spurious carrier
received signals that activate the WEI logic and cause unwanted communication.
Set the voltage criteria PPV level for Wei and PhV level for Wei for the weak-end 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.

Signals

Table 1092: CRWPSCH Input signals
Name Type
U3P SIGNAL
BLOCK BOOLEAN
BLK_IRV BOOLEAN
BLK_WEI1 BOOLEAN
BLK_WEI2 BOOLEAN
IRV BOOLEAN
FF BOOLEAN
CB_OPEN BOOLEAN
CR BOOLEAN
Table 1093: CRWPSCH Output signals
Name Type
OPR_IRV BOOLEAN
OPR_WEI BOOLEAN
ECHO BOOLEAN
CR BOOLEAN
Protection related functions
Default Description
- Three-phase voltages
0=False Block signal for activating the blocking mode
0=False Block of current reversal function
0=False Block of WEI Logic
0=False Block of WEI logic due to operation of other
protections
0=False Activation of current reversal logic
0=False Block of trip from WEI logic through fuse-failure
function
0=False Block of trip from WEI logic by an open breaker
0=False POR Carrier receive for WEI logic
Description
Operation of WEI logic in phase B
Operation of WEI logic in phase C
Carrier send by WEI logic
POR Carrier signal received from remote end
Section 5
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