As a reminder, Line Differential relays have distance-to-fault capabilities (assuming you have purchased the versions with optional VT inputs), where distance-to-fault can be displayed on the relay, or reported to SCADA – without the need to extract fault records and run files through SIGRA. This provides immediate information on fault location to operational staff.
July’s release of DIGSI/SIPROTEC 5 version 7.9 will add an option for improved ‘two ended’ fault location, called “FL plus”. For situations where there is back-feed from the remote-end into the fault, the new algorithm measures that remote-end fault-current, and communicates it to the main source end for that relay to account for it.
To further improve the accuracy of the result, the new feature also allows more line sections to be entered into the setup, allowing different cable/overhead sections to be more accurately modelled.
‘FL plus’ requires 45 function points to operate.
Fault Location is also available in SIPROTEC 5 Overcurrent relays.
SIPROTEC 5 - with improved distance to fault.
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