Application - ABB RELION Series Technical Manual

Section 6
Supervision functions
6.4.5
532
General output U_DEAD is activated when setting Num of phases matches the number
of phases where voltage is below the set low level setting. U_DEAD output is
deactivated immediately after voltage dead condition is no longer met.
The activation of the BLOCK input deactivates all outputs.

Application

PHSVPR can be used to detect which one of the MV feeders is energized for feeding
the MV/LV transformer. This can reduce the needed time to restore the power after a
fault occurs in the distribution network and power needs to be manually re-routed.
GUID-9CD263BF-4825-4D73-89F3-86750F87564F V1 EN
Figure 278: Detect live line to feed MV/LV transformer
PHSVPR can be used in addition to the other indications to detect if it is safe to start
working on the line (for example service work).
Never use PHSVPR as the only indication to check if the line is dead.
If the protection relay is used for the fault indication purposes only, then there might
be need to confirm the upstream breaker tripping. PHSVPR can be used for this
purpose together with protection and generic counter functions.
1MRS758755 A
REC615 and RER615
Technical Manual