High-voltage cable

Patent metadata

Field	Value
Publication number	US-10811167-B2
Application number	US-201515115361-A
Country	US
Kind code	B2
Filing date	Jan 9, 2015
Priority date	Jan 30, 2014
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

A high-voltage cable for electrostatically charging a coating agent in an electrostatic coating plant is provided. The cable includes a centrally arranged cable core and an electrically insulating jacket which sheaths the cable core. The cable core has a moderate electrical resistance according to the principles of the present disclosure. The cable core includes fibers that form a non-woven fabric, and at least one strip of the non-woven fabric of the cable core is twisted.

First claim

The invention claimed is:

1. A high-voltage cable for charging a coating agent in an electrostatic coating plant, the cable comprising:
a radially central cable core consisting of a plurality of twisted strips of nonwoven fabric, each strip of nonwoven fabric composed of a plurality of electrically conductive filaments, the cable core having an electrical resistance in the range of 10 kΩ/m-100 kΩ/m;
a first electrically insulating jacket layer sheathing the cable core;
an electrical shield layer surrounding the first electrically insulating jacket layer, the electrical shield layer having an electrical resistance less than the electrical resistance of the cable core; and
a field smoothing element sheathing the cable core at junctions spaced from each other along the cable, the field-smoothing element arranged between the cable core and the first electrically insulating jacket layer, the field-smoothing element lying directly on the twisted strips of the cable core.

2. The high-voltage cable of claim 1 , wherein the filaments each include an electrically insulating material impregnated with electrically conductive carbon, the fabric having a moderate electrical resistance configured for use in an electrostatic coating plant for electrostatically charging a coating agent.

3. The high-voltage cable of claim 1 , wherein at least part of the filament is made of an electrically conductive plastics material.

4. The high-voltage cable of claim 1 , wherein the nonwoven fabric strips of the cable core are configured with a coarseness for providing gaps therebetween, respectively, the gaps substantially limiting capillary forces thereat to be substantially insufficient to draw petroleum jelly into the gaps.

5. The high-voltage cable of claim 1 , wherein the nonwoven fabric strips are twisted sufficiently tightly to be substantially free of gaps between the strips thereof.

6. The high-voltage cable of claim 1 , wherein the field-smoothing element is made of a plastics material.

7. The high-voltage cable according to claim 6 , wherein the plastics material is polyolefin.

8. The high-voltage cable of claim 1 , wherein the field-smoothing element has a moderate electrical resistance configured for use in an electrostatic coating plant for electrostatically charging a coating agent, and the electrical resistance of the field-smoothing element is greater than the electrical resistance of the cable core, and the electrical resistance of the field-smoothing element is less than an electrical resistance of the first electrically insulating jacket layer.

9. The high-voltage cable of claim 1 , further comprising:
an electrically insulating outer jacket sheathing the cable core, the first electrically insulating jacket layer and the electrical shield layer.

10. The high-voltage cable according to claim 9 , wherein the outer jacket is made of a plastics material.

11. The high-voltage cable of claim 1 , wherein the first electrically insulating jacket layer is made of a plastics material, and the cable includes a second electrically insulating jacket layer coaxial to the first electrically insulating jacket layer.

12. The high-voltage cable of claim 1 , wherein one or more of the plurality of electrically conductive filaments abut the field smoothing element.

Assignees

• Duerr Systems Gmbh
• Duerr Systems Ag

Inventors

• Poppe Siegfried
• Kamp Heiko

Classifications

• H01B7/295

  using material resistant to flame · CPC title

• H01B7/0054 Primary

  Cables with incorporated electric resistances · CPC title

• H01B7/28

  {Protection against damage caused} by moisture, corrosion, chemical attack or weather · CPC title

• H01B7/282

  Preventing penetration of fluid {, e.g. water or humidity,} into conductor or cable · CPC title

• H01B7/0009

  Details relating to the conductive cores · CPC title