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Automatic Current Limiting Reactor for Transformers

IP.com Disclosure Number: IPCOM000124609D
Publication Date: 2005-Apr-29
Document File: 9 page(s) / 334K

Publishing Venue

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Related People

SuperPower, Inc.: CONTACT

Abstract

This invention is an automatic current limiting reactor (ACLR) for transformers for use within an electric power grid system (EPGS). The ACLR for transformers provides fault current protection to both the high-voltage primary circuit and to one or more low-voltage secondary circuits that each include a conventional step-down transformer whose secondary winding is arranged in parallel with a well-known fault current controller (FCC) unit, and where the primary and secondary windings of the step-down transformer are arranged in series with the primary and secondary windings of the power transformer, respectively. Since the FCC is connected in the stepped down portion of the grid, the FCC may include low voltage-rated power electronics. A single ACLR device in accordance with the invention provides fault current protection to both the high voltage primary circuit and the lower voltage secondary circuit, and further protects the power transformer that couples the two circuits.

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       Superpower, Inc. Publication of Intellectual Property

www.ip.com

Date: 8/10/2001 ID#: 88 (SP-145)

Publication Title: Automatic Current Limiting Reactor for

Transformers

Author(s)/Inventor(s): SuperPower, Inc.

450 Duane Ave., Schenectady, NY 12304 Tel.: 518-346-1414 e-mail: superpower@igc.com

Document Abstract:

The present invention is an automatic current limiting reactor (ACLR) for transformers for use within an electric power grid system (EPGS). The ACLR for transformers provides fault current protection to both the high-voltage primary circuit and to one or more low-voltage secondary circuits that each include a conventional step-down transformer whose secondary winding is arranged in parallel with a well-known fault current controller (FCC) unit, and where the primary and secondary windings of the step-down transformer are arranged in series with the primary and secondary windings of the power transformer, respectively. Since the FCC is connected in the stepped down portion of the grid, the FCC may include low voltage-rated power electronics. A single ACLR device in accordance with the invention provides fault current protection to both the high voltage primary circuit and the lower voltage secondary circuit, and further protects the power transformer that couples the two circuits.

The Invention:

FIELD OF THE INVENTION

The present invention relates to an automatic current limiting reactor (ACLR) that includes a fault current controller (FCC) used in conjunction with a transformer that provides fault current protection to both the high voltage and the low voltage portions of a utility grid magnetically coupled by a power transformer that is connected electrically in series with the aforementioned transformer.

BACKGROUND OF THE INVENTION

In the past three decades, electricity has risen from 25% to 40% of end-use energy consumption in the United States. With this rising demand for power comes an increasingly critical requirement for highly reliable, high quality power. As power demands continue to grow, older urban power systems in particular are being pushed to the limit of performance, requiring new solutions. In power transmission and distribution systems, a fault current condition may result from lightning striking a transmission line, or downed trees or utility poles shorting the transmission lines to ground. Such events create a surge of power through the. electric power grid system (EPGS) that can cause serious damage to EPGS equipment. As a result, the system's circuit breakers shut down the affected part of the EPGS. Serious faults can generate

                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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surge currents more than one hundred times the normal operating current. Severe faults can cause uncontrollable arcing within the breaker, hindering its effectiveness and even destroying it and other utility or customer equipment.

An ACLR is des...