Hello,
in our company we have 6kV resonant grounded grid. The issue is that between neutral point of 6kV transformer winding and Petersen coil are 2x 80A fuses (those fuses are paralel, so they will hold 160A). Those fuses are there since begining (aprox. 40-50 yrs).
Petersen coil is protected against faults in itself by Buchholz relay, that will shutdown whole transformer. So we doubt it could be useful there.
I think it could cause just problems.
Could someone please bring some light into this? Does it have some pros? What could cause disconnection (by fuse) of Petersen coil during earth fault? (i think it may cause to strike arc in place of ground fault)
Thanks for every reply.
in our company we have 6kV resonant grounded grid. The issue is that between neutral point of 6kV transformer winding and Petersen coil are 2x 80A fuses (those fuses are paralel, so they will hold 160A). Those fuses are there since begining (aprox. 40-50 yrs).
Petersen coil is protected against faults in itself by Buchholz relay, that will shutdown whole transformer. So we doubt it could be useful there.
I think it could cause just problems.
Could someone please bring some light into this? Does it have some pros? What could cause disconnection (by fuse) of Petersen coil during earth fault? (i think it may cause to strike arc in place of ground fault)
Thanks for every reply.