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CURRENT INTERRUPTION DEVICE AND CURRENT INTERRUPTION METHOD

外国特許コード F210010401
整理番号 (S2019-0563-N0)
掲載日 2021年5月7日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2020JP034978
国際公開番号 WO 2021054338
国際出願日 令和2年9月15日(2020.9.15)
国際公開日 令和3年3月25日(2021.3.25)
優先権データ
  • 特願2019-168601 (2019.9.17) JP
発明の名称 (英語) CURRENT INTERRUPTION DEVICE AND CURRENT INTERRUPTION METHOD
発明の概要(英語) Provided is a current interruption device equipped with: a current limiting element that is provided in a power supply path from a predetermined power source to a load device and exerts a current limiting action if a current flowing through the power supply path exceeds a first current threshold; a commutation path switch capable of on/off switching of electric conduction in a commutation path connected in parallel to the power supply path; and a control unit that controls on/off of the commutation path switch. The control unit switches the commutation path switch from off to on when detecting that the current flowing to the current limiting element has been limited to a second current threshold after exceeding the first current threshold, and switches the commutation path switch again to off when a predetermined switch-on maintaining time has elapsed since the commutation path switch was switched to on.
従来技術、競合技術の概要(英語) BACKGROUND ART
Conventionally, in electrical equipment such as a power system for power transmission and distribution, a breaker (a switch) that shuts off an electrical path in a power system to protect electrical equipment from excessive abnormal current caused by accidental events such as lightning strikes has been known. Such conventional breakers include magnetic breakers (arc chutes), vacuum breakers, gas breakers, and the like.
Furthermore, in the conventional breaker described above, arc discharge occurs when the internal electrical path is opened. Here, at the timing (current zero point) when the current in the power system becomes zero, the power supply to the arc temporarily becomes zero. Thus, the arc extinguishing point (cutoff point) and the current zero often coincide. Therefore, in the conventional breaker described above, it is necessary to passively wait for a current zero point, or to perform a positive operation of bringing the current in the power system close to zero (current limiting operation by injection of reverse current, arc extinguishing, or the like).
However, in a case where the cutoff is performed after waiting for the current zero point, a certain amount of time or longer may be required before the timing of the cutoff, and electrical equipment in the power system may be exposed to excessive abnormal currents and damaged.
In addition, in a case where an abnormal current is generated and cutoff is performed through a current-limiting operation, it is necessary to separately provide a reverse current injection circuit or the like for the current-limiting operation in addition to the cutoff function. As a result, the overall size of the shutoff device tends to increase.
Meanwhile, breaking devices that use current limiting fuses to limit and break current in power systems are also known. For example, in JP2008/59967A, a breaking device including a current-limiting fuse is proposed. In the breaking device in this JP2008/59967A, when abnormal current occurs, the electrical path breaker blocks an electrical path functioning as a normal power transmission path, and the abnormal current is diverted to the current-limiting fuse. Then, the arc discharge is extinguished by the current-limiting fuse, and thus the current is limited until the cutoff is substantially complete, in which the abnormal current becomes zero.
Also in JP6456575B, DC breakers have been proposed that cut off large currents using fuses. This DC breaker includes a fuse breaking portion and a high-speed interrupter disposed in parallel to each other, and when an accident current is detected, the high-speed interruption circuit opens, causing a large current to flow to the fuse, thereby breaking the DC breaker.
The shutoff devices in JP2008/59967A and JP6456575B each have a simpler configuration than the arc chute, the vacuum breaker, and the gas breaker described above, and can also be reduced in size as a whole.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • SAITAMA UNIVERSITY
  • TOKYO INSTITUTE OF TECHNOLOGY
  • THE UNIVERSITY OF TOKYO
  • 発明者(英語)
  • INADA, Yuki
  • YAMANO, Yasushi
  • MAEYAMA, Mitsuaki
  • ZEN, Shungo
  • OHNISHI, Wataru
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS IT JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN WS ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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