Surface modified overhead conductor

• US 9,859,038 B2
• Filed: 04/16/2013
• Issued: 01/02/2018
• Est. Priority Date: 08/10/2012
• Status: Active Grant

• Current Assignee: General Cable Technologies Corporation (General Cable Corporation)
• Original Assignee: General Cable Technologies Corporation (General Cable Corporation)
• Inventors: Davis, Cody R., Ranganathan, Sathish Kumar, Andersen, Ryan, Mhetar, Vijay, Temple, William S., Siripurapu, Srinivas, Baker, Gordon, Freestone, James, Doss, Dennis L.
• Primary Examiner(s): Murata, Austin
• Application Number:
  US13/863,902
• Publication Number:
  US 20140041925A1
• Time in Patent Office: 1,722 Days
• CPC Class Codes: H01B 13/30 Drying; Impregnating H01B13/32 takes precedence
• CPC Class Codes: H01B 3/008 Other insulating material
• CPC Class Codes: H01B 3/02 mainly consisting of inorganic substances
• CPC Class Codes: H01B 3/10 metallic oxides ceramics H01B3/12
• CPC Class Codes: H01B 3/46 silicones
• CPC Class Codes: H01B 5/002 Auxiliary arrangements
• CPC Class Codes: H01B 7/29 Protection against damage caused by extremes of temperature or by flame heat dissipation or conduction H01B7/42
• CPC Class Codes: H01B 7/421 for heat dissipation
• CPC Class Codes: H01B 9/006 Constructional features relating to the conductors
• CPC Class Codes: H01B 9/008 for overhead application

Abstract

The present invention relates to a surface modified overhead conductor with a coating that allows the conductor to operate at lower temperatures. The coating is an inorganic, non-white coating having durable heat and wet aging characteristics. The coating preferably contains a heat radiating agent with desirable properties, and an appropriate binder/suspension agent. In a preferred embodiment, the coating has L* value of less than 80, a heat emissivity of greater than or equal to 0.5, and/or a solar absorptivity coefficient of greater than 0.3.

Claims

1. A method for making a surface modified overhead conductor comprising the steps of:

(a) preparing a bare conductor, wherein step (a) comprises the steps of sand blasting the bare conductor, passing the bare conductor through an air wipe, and heating the bare conductor after the air wipe, wherein the heating is by direct flame exposure;

(b) applying a liquid coating mixture on the surface of the bare conductor to form a coated conductor; and

(c) drying the coated conductor.

2. The method of claim 1, wherein after the air wipe, the number of particles, that are greater than 10 microns in size, on the surface of the bare conductor are lower than 1,000 per square feet of the conductor surface.

3. A method for making a surface modified overhead conductor comprising the steps of:

(a) preparing a bare conductor;

(b) applying a liquid coating mixture on the surface of the bare conductor to form a coated conductor, wherein step (b) further comprises passing the bare conductor through a flooded die and then through an air wipe; and

(c) drying the coated conductor.

4. The method of claim 3, wherein the flooded die comprises an annular shaped portion with a center opening through which the bare conductor passes.

5. The method of claim 4, wherein the flooded die further comprises a tube for carrying the liquid coating mixture to the die.

6. The method of claim 4, wherein the flooded die comprises opening ports through which the liquid coating mixture is deposited on to the bare conductor.

7. A method for making a surface modified overhead conductor comprising the steps of:

(a) preparing a bare conductor;

(b) applying a liquid coating mixture on the surface of the bare conductor to form a coated conductor; and

(c) drying the coated conductor, wherein step (c) comprises heating the conductor, and wherein the heating is by direct flame exposure.