Shielded wire for high voltage skin effect trace heating

A skin effect and voltage technology, applied in ohmic resistance heating, ohmic resistance heating parts, electric heating devices, etc., can solve the problems of insulation device breakdown, corrosion of solid insulation devices, etc.

Pending Publication Date: 2019-03-01
NVENT SERVICES GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prolonged partial discharges can corrode solid insulation and eventually lead to breakdown of the insulation at the point of contact

Method used

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  • Shielded wire for high voltage skin effect trace heating
  • Shielded wire for high voltage skin effect trace heating
  • Shielded wire for high voltage skin effect trace heating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Referring now to the figure, figure 1 A heating cable 100 is shown according to various embodiments. The illustrated heating cable 100 is shown with each layer subsequently stripped away to clearly illustrate its construction in accordance with at least one embodiment. The heating cable 100 comprises a conductor 102 at its core. Conductor 102 may be any suitable conductive material, including tin-plated copper, nickel-plated copper, aluminum, steel, gold, platinum, silver, and others. The conductor 102 may be a solid wire or may be a stranded wire. Conductor 102 is encapsulated within an electrically insulating layer 104 that is not conductive. Electrically insulating layer 104 may be any suitable material, including silicone, PFA, EDPM, XPLE, and others. In some embodiments, the periphery of conductor 102 physically contacts electrically insulating layer 104 entirely. In other embodiments, the conductor 102 is encapsulated within the inner semiconducting layer 106...

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PUM

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Abstract

A skin effect heating system for long pipelines includes a heater cable disposed in a ferromagnetic or other conductive heat tube, the heater cable and heat tube cooperating to produce heat that is applied to the carrier pipe. The heater cable includes a conductor surrounded by an insulating layer, and then a semiconductive outer layer or "jacket." The semiconductive jacket contacts the inner surface of the heat tube, where the charge density of the return current carried by the heat tube is at its highest. The semiconductive jacket material has a resistivity that is sufficiently low to reduceor eliminate arcing events such as corona discharge by allowing accumulated charge on the heat tube to dissipate. The resistivity is also high enough to prevent the return current from flowing into or through the semiconductive outer layer, so that heat production capacity of the system is maximized.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority to US Provisional Patent Application No. 62 / 334346, filed May 10, 2016 under the same title and hereby incorporated by reference in its entirety. Background technique [0003] The field of the invention is high voltage heating cables. More specifically, the present invention relates to wire designs for components of skin effect heat tracing systems. [0004] In the oil and gas industry, pipelines must be heated over distances of many miles. Skin effect electrothermal tracing systems are ideally suited for long transfer lines up to 12 miles (20 kilometers) per circuit. The system was designed for this particular application. Applications for this system include material transfer piping, snow melting and deicing, tank base heating, subsea transfer piping and prefabricated pre-insulated piping. In skin effect heating systems, heat is generated on the inner surface of a fer...

Claims

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Application Information

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IPC IPC(8): F16L53/38H05B3/04F16L59/00
CPCH05B3/0004H05B2214/02H05B2214/03H05B3/56H05B2203/021F16L53/38H01B7/02H01B7/17
Inventor W·董P·贝克
Owner NVENT SERVICES GMBH
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