Basic protection scheme for 11kV industrial plant
Basic protection scheme for 11kV industrial plant
(OP)
Hi All,
I am developing a concept design for 11kV power distribution system. It is a basic system with 11kV supply from the distributor (250MVA fault level) feeding 3-off 300 kVA 11/0.4kV TFs and 1-off 1.0MVA 11/0.4kV TF.
It's just a bus topology, no ring, etc.
I need to select the appropriate switchgears for the job. At the moment I have switch fuses for both the service isolator and protecting the TFs, but, the service isolator (100A) will blow when I energise the 1MVA TF.
How does one get around this problem? (this is likely a very elementary problem)...
I am developing a concept design for 11kV power distribution system. It is a basic system with 11kV supply from the distributor (250MVA fault level) feeding 3-off 300 kVA 11/0.4kV TFs and 1-off 1.0MVA 11/0.4kV TF.
It's just a bus topology, no ring, etc.
I need to select the appropriate switchgears for the job. At the moment I have switch fuses for both the service isolator and protecting the TFs, but, the service isolator (100A) will blow when I energise the 1MVA TF.
How does one get around this problem? (this is likely a very elementary problem)...






RE: Basic protection scheme for 11kV industrial plant
I recommend you purchase the IEEE Red Book and read it as a starting point if you are trying to design an electrical system.
RE: Basic protection scheme for 11kV industrial plant
Or, as dpc posted, use a fuse that will not blow. You have to take more than just the rated load into account when sizing this stuff.
RE: Basic protection scheme for 11kV industrial plant