Phase selection logic
General output U_LIVE is activated when setting
Num of phases
matches the
number of phases where voltage is set above high level setting. U_LIVE output
is deactivated immediately after voltage live condition is no longer met.
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.
6.4.5 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.
Figure 277: 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.
Supervision functions
1MRS758755 C
548 REC615 & RER615
Technical Manual
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