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Ultra compact Electric Power Transmission or Distribution Cable Using, for example, YBCO High Temperature Superconductor

IP.com Disclosure Number: IPCOM000124288D
Publication Date: 2005-Apr-14
Document File: 4 page(s) / 104K

Publishing Venue

The IP.com Prior Art Database

Related People

SuperPower, Inc.: OWNER

Abstract

Present day high temperature superconducting (HTS) underground power transmission line cables under development using BSCCO HTS have major shortcomings. There is a very strong conflict for BSCCO between a) the desire to reduce cable core diameters to make a small enough cable to fit into existing ducts, and b) windability without damage in the cable construction, c) acceptable ac loss, and d) cost performance that would make the HTS cable feasible. We propose a compact, relatively small-diameter cable that solves the problem posed in (a) of making cables smaller to fit into a larger number of existing ducts. To achieve this compactness, this cable uses a relatively thin conductor tape having a very thin very high critical current density superconducting layer, such that problems (b), (c) and (d) are also solved. One example of this type of tape is a relatively flexible and low-cost, high critical current density YBCO thin film HTS superconductor.

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       Superpower, Inc. Publication of Intellectual Property

www.ip.com

Date: January 2002 ID#: 165

Publication Title: Ultra Compact Electric Power Transmission or

Distribution Cable Using, for example, YBCO High Temperature Superconductor

Author(s)/Inventor(s): Michael S. Walker, Drew W. Hazelton, Chandra T. Reis

SuperPower, Inc. 450 Duane Ave., Schenectady, NY 12304 Tel.: 518-346-1414 e-mail: dhazelton@igc.com or creis@igc.com

Document Abstract:

Present day high temperature superconducting (HTS) underground power transmission line cables under development using BSCCO HTS have major shortcomings. There is a very strong conflict for BSCCO between
a) the desire to reduce cable core diameters to make a small enough cable to fit into existing ducts, and
b) windability without damage in the cable construction,
c) acceptable ac loss, and
d) cost performance that would make the HTS cable feasible.

We propose a compact, relatively small-diameter cable that solves the problem posed in (a) of making cables smaller to fit into a larger number of existing ducts. To achieve this compactness, this cable uses a relatively thin conductor tape having a very thin very high critical current density superconducting layer, such that problems (b), (c) and (d) are also solved. One example of this type of tape is a relatively flexible and low-cost, high critical current density YBCO thin film HTS superconductor.

The Invention:

I. Statement of the Problem

The successful manufacture and use of HTS underground power transmission cables depends on several factors. Present day cables under development using BSCCO HTS have major shortcomings:

(a) Cable Size: A major advantage and a major part of the market for superconducting underground power transmission cables stems from the ability to use the very high current capacity of these cables to supply additional power through ductwork that already exists for conventional cables. That is because most underground cables are installed in cities where the cost of new or additional rights of way and the cost of building new ductwork are very high.

It is very difficult and in many cases impossible to make HTS cables that will fit into existing conventional ducts using the high temperature superconductors presently being manufactured; that is using powder-in-tube Bi2Sr2Ca2Cu3Ox high temperature superconducting (HTS) tapes (BSCCO). For example, consider a127 mm (5 inch) inside diameter duct commonly found in the ductwork of many utilities.

The BSCCO cable shown in Fig. 1 was designed to be as compact as it could reasonably be, but its 141 mm (5.55 inch) diameter simply will not allow its installation in the 127 mm inside-diameter duct.

                 SuperPower, Inc. 450 Duane Avenue Schenectady, New York 12304 Tel. (518) 346-1414 Fax (518) 346-6080 www.igc-superpower.com

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Confidential Information

Conceptual Design of a 34.5kV, 1,200A, 75MVA Cold Dielectric HTS Cable

Fig. 1

A potential solution would be to make the cable core an...