Current-limiting and power-flow control device

Patent metadata

Field	Value
Publication number	US-9762051-B2
Application number	US-201414770998-A
Country	US
Kind code	B2
Filing date	Mar 26, 2014
Priority date	Apr 1, 2013
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A current-limiting and power-flow control device according to the present invention includes a superconducting current-limiting element including a superconductor, a series capacitor, and a parallel circuit. The series capacitor is connected in series with the superconducting current-limiting element. The parallel circuit includes a reactor connected in parallel with a series circuit including the superconducting current-limiting element and the series capacitor. Accordingly, overcurrent at the time of occurrence of a fault causes transition of the superconductor of the superconducting current-limiting element to the normal conducting state, and thus causes autonomous current-limiting operation of the superconducting current-limiting element. Thus, application of an excessive load across the terminals of the series capacitor due to the aforementioned fault can surely be prevented. Accordingly, unlike the conventional device, it is unnecessary to install an arrester for protection of the series capacitor and the configuration of the current-limiting and power-flow control device can be simplified.

First claim

The invention claimed is:

1. A current-limiting and power-flow control device in which a superconductor is used, comprising:
a superconducting current-limiting element including said superconductor;
a capacitor connected in series with said superconducting current-limiting element; and
a parallel circuit including a reactor connected in parallel with a series circuit including said superconducting current-limiting element and said capacitor.

2. The current-limiting and power-flow control device according to claim 1 , wherein said reactor included in said parallel circuit functions as a current-limiting reactor.

3. The current-limiting and power-flow control device according to claim 1 , wherein said parallel circuit includes a thyristor switch connected in series with said reactor.

4. The current-limiting and power-flow control device according to claim 1 , wherein said parallel circuit includes a tapped reactor connected in series with said reactor.

Assignees

• Sumitomo Electric Industries

Inventors

• Isojima Shigeki
• Nogawa Shuichi
• Noguchi Kouji
• Kuroda Kazuhiro

Classifications

• H02H9/021

  Current limitation using saturable reactors (H02H9/023 takes precedence) · CPC title

• H02H9/023 Primary

  Current limitation using superconducting elements · CPC title

• H02H3/08

  responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04) · CPC title

• Y02E40/69

  Cross-Sectional Technologies · mapped topic

• Y02E40/68

  Cross-Sectional Technologies · mapped topic