Design of Full Range Current Limit Fuse for Oil Immersed Distribution Transformers

• Main Authors: Chen-Yi Chiu, 邱正義
• Other Authors: Horng-Ching Hsiao
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/08474773812482517002

碩士 === 國立臺灣科技大學 === 電機工程系 === 96 === Electric power fuses have been used for protecting equipments in electric power system for over hundred years. Although other new protecting equipments have been provided with much more complex functions, power fuses are still very important equipments in electric power system. The simple construction, high reliability and fastest current cutout properties make it be used widely of the world. Traditional power fuses are sufficiently used for breaking high current, such as fault current, but insensitvely for low overload current (i.e. less than five times the rate value). Full range current limit fuses are designed for both high breaking zone and low overload breaking zone protections. The study for full range current limit fuse was beginning from rating requirements of fuse characteristics, electrical arcing and circuit modeling, then calculating and designing constructions and sizes of fuse element were investigated. The protocol samples were made and tested to check design performances including dielectric, interrupting, temperature rise, time-current, liquid tightness. This study provides the technical design theory above of full range current limit fuses for oil immersed distribution transformer. Three type fuses made according to this study, were tested according to IEEE Std C37.41-2000, which could be used in oil immersed transformer for external power distribution system.