Enclosed insulator assembly for high-voltage distribution systems
An enclosed insulator assembly has a generally cylindrical polysiloxane body, a tubular Durethan® core with upper and lower terminals, Multilam™ contacts within the terminals, an arc-quenching tube, and a manually removable handle. Entrance holes in the body accommodate the coupling of external cables to the terminals. A threaded cylinder positioned on the handle's interior accommodates one of an interchangeable cutout fuse tube assembly and disconnect tube assembly and permits the assembly to be inserted into the core as the handle is positioned on the body. Both assemblies have top and bottom fittings with O-rings that prevent weather corrosion between the fittings and terminals. A grooved load interrupter is attached to the bottom fitting of the assemblies to suppress arcing when the assembly is pulled out from the body.
1. An enclosed insulator assembly for high-voltage distribution systems comprising:
a generally tubular axially-extending outer body formed from a non-brittle, electrically insulative thermoplastic material lighter in weight than porcelain and having a manually removable handle, the outer body having at least one entranceway for permitting cables electrically coupled to the distribution system to enter into the interior of the body;
a threaded cylinder mounted generally coaxially onto the inside of the handle and affixed thereto with epoxy;
an axially-extending threaded tube assembly threadably and securely engaging said cylinder so as to be removable with said handle as a detachably integral component thereof, said tube assembly being selected from the group comprising of cutout fuse tube assemblies and disconnect tube assemblies;
an axially extending load interrupter coupled to the tube assembly axially opposite the handle, the load interrupter having a generally tube-shaped body formed from epoxy material and having a plurality of axially extending grooves on its outer periphery, and
a plastic tube mounted within the outer body and having first and second terminal means adapted to be electrically coupled to the cables, the plastic tube having an inner dimension accommodating the insertion therein of the tube assembly, the tube assembly having first and second connection means for electrically coupling to the distribution system via the first and second terminal means of the plastic tube, the internal dimension of the plastic tube and the external dimension of the load interrupter being such that any electric arc created as the tube assembly is withdrawn from the plastic tube is compressed and suppressed therebetween; and
a pair of sealing rings respectively positioned with respect to the plastic tube and tube assembly to inhibit air flow in the regions where the first and second terminal means are coupled to the first and second connection means.