4 Protection Functions and Specifications
4-22
L-PRO 4000 User Manual
D02706R02.30
Weak Infeed
(WI)
Weak Infeed provides tripping if fault levels are too low to activate the distance
units. If enabled, this function sends a permissive trip signal even if the fault
level seen by the relay is very low as when the line breaker is open. The posi-
tive sequence and zero sequence voltage detectors allow the relay to echo back
a permissive signal to allow the end with fault current to trip quickly without
the need for an auxiliary b contact.
Aux Breaker Status
EI1 to EI 20, PL1 to PL24, VI1 to VI30 (This setting shall
be enabled when the Breaker signal setting selected as
Status Monitoring & ring bus configuration is enabled)
SOTF Enabled Duration (B1,
Pick-up timer)
0.0 to 999.9 Seconds
Device 50 Pickup
0.5 to 50.0 A secondary (5 A)
0.1 to 10.0 A secondary (1 A)
Device 50N Pickup
0.5 to 50.0 A secondary (5 A)
0.1 to 10.0 A secondary (1 A)
Second Harmonica Restraint
Logic
Enabled/Disabled
I
2
/
I
1
Ratio
0.0 to 10.0
Table 4.7: Switch On To Fault Settings
Table 4.8: Weak Infeed Settings
Weak Infeed
Enable/Disable
Device 27 V1 Pickup
0.0 to 69.0 V secondary
Device 59 3V0 Pickup
0.0 to 100.0 V secondary
Zone 2/Zone 4 Reset Delay (TWD1)
0.02 to 0.20 seconds
Communication Cycle Reset Delay
(TWD2)
0.02 to 0.20 seconds
Communication Reset Time Delay
(TW3)
0.02 to 1.0 seconds
Summary of Contents for L-PRO 4000
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