US 10,418,210 B2Granted

DC circuit breaker

AssigneeHyosung Heavy Industries Corporation

InventorsByung Choul Kim, Se Hee Han, Jung Ki Hong, Young Seong Han

Life of this patent

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Abstract

Disclosed is a DC circuit breaker capable of interrupting fault currents flowing in both forward and backward directions. The DC circuit breaker includes: a first mechanical switch for interrupting a current in a DC transmission line; a first diode connected in parallel with the first mechanical switch; a second mechanical switch, connected in series with the first mechanical switch, for interrupting a current in the DC transmission line; a second diode connected in parallel with the second mechanical switch; an LC circuit connected in parallel with the first and second mechanical switches and including a capacitor and a reactor connected in series to induce LC resonance; a first unidirectional switching device connected in parallel with the LC circuit and switching a current to induce LC resonance; and a bidirectional switching device connected in series with the LC circuit and switching currents flowing in both forward and backward directions.

Claims11

Dependent claims

A DC circuit breaker comprising:

a first mechanical switch installed on a DC transmission line and being opened to interrupt a current in the DC transmission line when a fault occurs at one side thereof on the DC transmission line;
a first diode connected in parallel with the first mechanical switch;
a second mechanical switch connected in series with the first mechanical switch and being opened to interrupt a current in the DC transmission line when a fault occurs at the remaining side thereof on the DC transmission line;
a second diode connected in parallel with the second mechanical switch;
an LC circuit connected in parallel with the first and second mechanical switches and including a capacitor and a reactor connected in series with each other to induce LC resonance;
a first unidirectional switching device, connected in parallel with the LC circuit, for switching a current flowing in one direction, to induce LC resonance;
and
a bidirectional switching device, connected in series with the LC circuit, for switching currents flowing in both forward and backward directions.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/540,953Filed 24 Dec 2015
Priority: KR 10-2014-019274129 Dec 2014
Published: US 2018/0019084 A118 Jan 2018
Granted: 17 Sep 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H01H 33/596
Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the…:…
H02H 3/087
Responsive to excess current: for DC applications
H01H 33/143
Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc: of different construction or type
H01H 33/703
Characterised by an insulating tubular gas flow enhancing nozzle: having special gas flow directing elements, e.g. grooves, extensions