11kV switchgear neutral is earthed through NER(400A, 10sec). One of the outgoing feeder of 11kV switchgear is having YNyn0 transformer (11/0.433kV) with primary side neutral connection is floating and secondary side neutral is solidly grounded. we understand that keeping neutral floated on 11kV side is better compared to either solidly grounded or NER grounded.
Could you please suggest what type of earthing shall be considered on transformer primary side(i.e. 11kV ).and also explain type of protections to be considered for proposed earthing system.
Could you please suggest what type of earthing shall be considered on transformer primary side(i.e. 11kV ).and also explain type of protections to be considered for proposed earthing system.
