Selection Guide - S & C Electric

Selection Guide For Transformer Primary Fuses in Medium- and High-Voltage Utility and Industrial Substations S&C Power Fuses Types SMD-1A, SMD-2B, SMD-2C, SMD-3, and SMD-50. Outdoor Transmission ( kV through 138 kV). S&C Electric COMPANY. Table of Contents Section Page Number General.. 3. Application Principles Select the Primary Fuse Rating.. 5. Accommodate Expected Loading Levels.. 6. Withstand Inrush Currents.. 7. Protect Transformer Against Damaging Overcurrents.. 14. Coordinate with Other Protective Devices.. 25. Protect Downstream Conductors Against Damaging Overcurrents.. 39. The Fuse- Selection Tables Introduction to Fuse- Selection Tables.. 41. Basis for Listings in the Fuse- Selection Tables .. 42. How to Use the Fuse- Selection Tables.. 44. Fuse- Selection Tables .. 51. 2. General This information bulletin is a Guide for the Selection , former or when line-to-line or line-to-ground voltage exists application, and coordination of S&C Type SMD across the fuse. They also will detect or interrupt faults Power Fuses when applied on the primary side of small regardless of whether the transformer is adjacent to the to medium-sized transformers installed in utility and fuse or connected to it via a cable from a remote location, industrial substations.

Selection Guide S&C EL E C T RIC C OMP A NY S&C Power Fuses Types SMD-1A, SMD-2B, SMD-2C, SMD-3, and SMD-50 Outdoor Transmission (34.5 kV through 138 kV)

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