Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific transmission line
Patent
1998-02-20
1999-04-27
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific transmission line
361 1, 174 45TD, 174 40TD, 248 64, H02H 700
Patent
active
058985581
ABSTRACT:
A protective overload device (POD) that absorbs energy and reduces the damage to transmission towers resulting from sudden conductor, shield wire, insulator, or conductor suspension failures is herein disclosed. The POD is positioned between the non-energized end of the insulator and the tower or support structure, or between the energized end of the insulator and the conductor. The POD consists of a top lid, a bottom plate, and a ductile load fuse refill disk. The top lid is slotted at regular intervals to allow for transverse deformation of the individual fingers that hold the bottom plate. The ductile load fuse refill disk consists of a filler material in which a steel cable is embedded. The POD acts as a passive rigid link under normal conditions. In the event of a dynamic shock that could fail a tower or tower arm, the fingers of the top lid will move outward along the sliding plane of the bottom plate until the bottom plate separates from the top lid. At this time all the load is transferred to the refill disk which will disintegrate as the steel cable is pulled through the refill disk's material. Once the device has been activated, the POD can be reset by fitting the device with a new refill disk and reassembling the device by pressing the top lid and bottom plate together.
REFERENCES:
patent: 3711049 (1973-01-01), Grannis
patent: 4195192 (1980-03-01), Hackney et al.
United States Department of Energy Final Report entitled "Test Verification of a Device for Reduction of Severe Dynamic Loads in Electric Transmission Towers", prepared by Anco Engineers, Inc. (1989).
Electric Power Research Institute Research Report EL-643, entitled Longitudinal Unbalaced Loads on Transmission Line Structures (1978).
Electric Power Research Institute Inc.
Gaffin Jeffrey
Galliani William S.
Sherry Michael J.
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