voltage transformer protection

Home Electrical Engineering Forum General Discussion voltage transformer protection

Viewing 2 posts - 1 through 2 (of 2 total)
  • Author
  • #10703

    dear friend,

    I want to protect voltage transformer by fuse.

    voltage transformer : 6.3kv/110v ac,10vA,cl 0.5+3p

    i have a fuse with 3.15A ,12kV

    as you see the voltage rating of both is different

    is it possible that protect this fuse with voltage transformer?


    Anthony Jarmie

    Hello there,


    The 10VA & 110VA are called steady state ratings. Find out the transient kVA requirement from this transformer. This will be the aggregate of the inrush VA of all the components – that are expected to be simultaneously switched ON – connected to the control transformer secondary winding. Find out transient current from: Transient kVA/Secondary Voltage. Find out the duration of this inrush current. Whatever fuse you select, find out the trip time from the I-t curve of the fuse – for this transient current. You should select such a fuse that the tripping time of the fuse for the transient current should be more than the inrush duration.



    Anthony Jarmie

Viewing 2 posts - 1 through 2 (of 2 total)
  • You must be logged in to reply to this topic.