FUSED COUPLER ASSEMBLY

• US 3,781,745 A
• Filed: 09/10/1969
• Issued: 12/25/1973
• Est. Priority Date: 09/10/1969
• Status: Expired due to Term

• Current Assignee: Joslyn Corp. (Danaher Corporation)
• Original Assignee: Ramanlal R. Vadnagara
• Inventors: Vadnagara, Ramanlal R.
• Primary Examiner(s): Broome, Harold
• Application Number:
  US04/856,691
• Time in Patent Office: 1,567 Days
• Field of Search: 337/201,224,199 174/73
• US Class Current: 337/199
• CPC Class Codes: H01H 2085/0225 Means for preventing discharge, e.g. corona ring
• CPC Class Codes: H01H 85/042 General constructions or structure of high voltage fuses, i.e. above 1000 V

Abstract

A fused coupler assembly includes a submersible conductive housing used in underground distribution systems. The housing contains a dielectric filler in which a cylindrical resistor shield encompassing a fuse element is located. The cylindrical shield is formed of a tube coated with a resistance material so that a shield is formed of sufficiently low resistance to prevent corona from occurring between the tube and the fuse element. The coating shield also is of sufficiently high resistance to minimize line-to-ground leakage when the fuse element is blown during a fault condition.

Claims

1. A fused coupler assembly for use in an underground distribution system comprising:

a conductive grounding housing, a cylindrical tube defining a tube cartridge within said housing, a fuse element disposed within said tube, a coating helically wound on said tube, said coating being connected to line potential at least at one end and being of sufficiently low resistance to prevent corona occurring between said tube and said fuse element; and

a dielectric filler in the space between said tube and said housing, said filler being in void-free interfacial engagement with said tube and said housing.