Fuse Protection of High-Voltage Power Transformers

Power fuses are being used in increasing numbers for the safe protection of power transformers and associated equipment. This increased usage can be attributed to the low installation cost, simplicity of maintenance, and generally reliable protection. Their use does require an understanding of fuse types, characteristics, application, and transformer short-circuit current. A major aspect of the application is the co-ordination of the power fuse with other significant protective devices in the entire protective scheme. This paper attempts to review concepts of the present state of the art of fuse application based on study of their performances over 30 years.