High-Voltage Fusing of Transformer Banks

The paper summarizes some 15 years´ experience with the high-side fusing of 11-, 22-, and some 66-kv transformer banks. The original purpose of fusing has through this experience been expanded to cover functions that are deemed desirable, and the authors feel that their approach to the specific protection field served by fuses has resulted in satisfactory protection at minimum cost. The results of some faults occurring in fused and unfused banks are described briefly, and the various factors taken into consideration in selecting the proper fuse to use are discussed. The conclusions drawn are that fuses, when applicable, are a satisfactory economical means of obtaining reasonable coverage for faults in and beyond transformer banks.