At present

there are no fuses that can protect the voltage transformer completely in the world

neither relevant IEC standards. This paper developed a new kind of vacuum hybrid full-range current-limiting fuse to protect voltage transformer. The fuse consists of a vacuum fuse in series with a current-limiting fuse

and is moulded by APG technique. In terms of the basic working principle of a fuse

it makes use of the very fast time-current characteristic of the vacuum fuse to break small overload current

and adopts the current-limiting fuse to break large overload current and short circuit current. The experimental results indicate that the new fuse can work normally when the rated voltage factor is within the range of 1～1.2

and work reliably in 30 seconds when the rated voltage factor is 1.9. It has successfully broken the short circuit current of 31.5 kA to provide a proper protection for the voltage transformer. This fuse is safe and reliable with a new structure and a high performance-cost ratio.