JP2015198547A - Hybrid-type power source switching device - Google Patents

Hybrid-type power source switching device Download PDF

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JP2015198547A
JP2015198547A JP2014076665A JP2014076665A JP2015198547A JP 2015198547 A JP2015198547 A JP 2015198547A JP 2014076665 A JP2014076665 A JP 2014076665A JP 2014076665 A JP2014076665 A JP 2014076665A JP 2015198547 A JP2015198547 A JP 2015198547A
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power source
switch
power supply
power
source switching
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久幸 長瀬
Hisayuki Nagase
久幸 長瀬
崇敏 池田
Takatoshi Ikeda
崇敏 池田
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SHIN AICHI DENKI SEISAKUSHO KK
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SHIN AICHI DENKI SEISAKUSHO KK
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies

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Abstract

PROBLEM TO BE SOLVED: To provide a hybrid-type power source switching device that is compact, requires no large installation space, and has excellent working efficiency for maintenance.SOLUTION: A hybrid-type power source switching device permits independent drawing of: a circuit breaker part unit 1 accommodating a power source switching circuit breaker therein; a semiconductor switch unit 2 accommodating a semiconductor switch therein; and a control part unit 3 accommodating a power source switching controller therein. Bypass switches are preferably respectively mounted on bypass circuits on both power source sides of the power source switching circuit breaker.

Description

本発明は、Ａ電源とＢ電源との間で電源切替を高速で行うことができるハイブリッド形電源切替装置に関するものである。   The present invention relates to a hybrid power supply switching device that can perform power supply switching between an A power supply and a B power supply at high speed.

電源切替装置は、負荷への給電をＡ、Ｂ両電源間で切替えるための装置であり、例えばＡ電源を商用電源、Ｂ電源を蓄電池、太陽光発電装置、非常用発電装置などの分散電源としておけば、商用電源が停電したときに、電源切替スイッチを瞬時に分散電源に切り替えることにより、負荷への給電を継続することができる。   The power source switching device is a device for switching power supply to the load between the A and B power sources. For example, the A power source is a commercial power source, the B power source is a distributed power source such as a storage battery, a solar power generation device, an emergency power generation device, etc. In this case, when the commercial power supply fails, power supply to the load can be continued by instantaneously switching the power supply switch to the distributed power supply.

近年、重要施設においては２系統の電源などの冗長回路を用意している。電源切替装置としては、従来から永年にわたり有接点スイッチを使用したものが使用されてきたが、停電時の切り替えには、有接点スイッチは電源切替に数１０ｍｓを要し、コンピュータ等の負荷に対しては悪影響が生ずるおそれがある。このため最近では特許文献１に示されるように、半導体スイッチを使用した電源切替装置が用いられている。半導体スイッチを用いれば、電源の切替時間を数μs程度にまで大幅に短縮することができる。   In recent years, redundant facilities such as two power sources have been prepared in important facilities. As a power supply switching device, a device using a contact switch has been used for many years. However, a contact switch requires several tens of ms to switch the power supply in the event of a power failure. May cause adverse effects. For this reason, recently, as shown in Patent Document 1, a power supply switching device using a semiconductor switch has been used. If a semiconductor switch is used, the switching time of the power source can be greatly reduced to about several μs.

しかしながら、電流量が大きい場合には半導体スイッチを通じて通電を継続していると半導体が発熱するため、大型の冷却装置を用いて冷却しなければならず、装置が大型化するという問題がある。   However, when the amount of current is large, the semiconductor generates heat when energization is continued through the semiconductor switch. Therefore, there is a problem that the apparatus needs to be cooled using a large cooling device and the device becomes large.

そこで常時は有接点スイッチを通じて負荷への給電を行ない、電源切替時にのみ半導体スイッチを用いるハイブリッド形電源切替装置が実用化されている。しかし有接点スイッチは機械式であり、定期的な保守・点検を行わなければならない。負荷への給電を行いながら有接点スイッチの保守・点検を行うために、バイパス回路用のバイパススイッチを納めたブレーカ盤を別途必要となり、設置スペースが大型化するという問題があった。この問題は特に停電が許されないデータセンターにハイブリッド形電源切替装置を設置する場合に重要であり、小型であってメンテナンス作業も行い易い電源切替装置が求められていた。   In view of this, a hybrid power supply switching apparatus that supplies power to a load through a contact switch at all times and uses a semiconductor switch only at the time of power supply switching has been put into practical use. However, reed switches are mechanical and require regular maintenance and inspection. In order to perform maintenance / inspection of the reed switch while supplying power to the load, a breaker panel containing a bypass switch for the bypass circuit is required separately, resulting in a problem that the installation space is increased. This problem is particularly important when a hybrid power switching device is installed in a data center where a power failure is not allowed, and a power switching device that is small in size and easy to perform maintenance work has been demanded.

特開平１０−３２２９３３号公報JP-A-10-322933

従って本発明の目的は上記した従来の問題点を解決し、コンパクトであって広い設置スペースを必要とせず、しかもメンテナンスの作業性にも優れたハイブリッド形電源切替装置を提供することである。   Accordingly, an object of the present invention is to solve the above-described conventional problems, and to provide a hybrid power source switching apparatus that is compact, does not require a large installation space, and is excellent in maintenance workability.

上記の課題を解決するためになされた本発明のハイブリッド形電源切替装置は、電源切替開閉器を収納した開閉器部ユニットと、半導体スイッチを収納した半導体スイッチユニットと、電源切替コントローラを収納した制御部ユニットとを、個別に引出し可能にしたことを特徴とするものである。   The hybrid power switching device of the present invention made to solve the above problems includes a switch unit that houses a power switching switch, a semiconductor switch unit that houses a semiconductor switch, and a control that houses a power switching controller. It is characterized in that the unit unit can be pulled out individually.

なお請求項２のように、前記開閉器部ユニットは、電源切替開閉器の両側のバイパス回路に、それぞれバイパススイッチを搭載したものとすることが好ましい。   As in claim 2, the switch unit preferably includes a bypass switch in each bypass circuit on both sides of the power switch.

本発明のハイブリッド形電源切替装置は、電源切替開閉器を収納した開閉器部ユニットと、半導体スイッチを収納した半導体スイッチユニットと、電源切替コントローラを収納した制御部ユニットとを、個別に引出し可能にしたコンパクトな構造であるため、広い設置スペースを必要としない。従ってデータセンター等に設置する場合に有利である。   The hybrid power supply switching device of the present invention can individually pull out a switch unit that stores a power switch, a semiconductor switch unit that stores a semiconductor switch, and a control unit that stores a power switch controller. Because of its compact structure, it does not require a large installation space. Therefore, it is advantageous when installed in a data center or the like.

また本発明のハイブリッド形電源切替装置は、それぞれのユニットを個別に引出し可能にしたので、引き出して各ユニット毎にメンテナンス作業を行うことができ、作業性に優れる。しかもユニットは自由に配置することができ、配置の自由度を高めることができる。   Moreover, since the hybrid type power supply switching device of the present invention enables each unit to be pulled out individually, it can be pulled out to perform maintenance work for each unit, and is excellent in workability. Moreover, the units can be arranged freely, and the degree of freedom of arrangement can be increased.

請求項２の発明によれば、電源切替開閉器の両側のバイパス回路に、それぞれバイパススイッチを搭載したので、負荷への給電がＡ、Ｂ何れの電源からなされている状態においても、負荷への給電を継続したままの状態で、メンテナンス作業を行うことができる利点がある。   According to the second aspect of the present invention, since the bypass switch is mounted on each of the bypass circuits on both sides of the power supply switching switch, even when power is supplied to the load from either the A or B power source, There is an advantage that maintenance work can be performed in a state where power feeding is continued.

実施形態のハイブリッド形電源切替装置の単線結線図である。It is a single line connection diagram of the hybrid type power supply switching device of an embodiment. 配置例を示す正面図である。It is a front view which shows the example of arrangement | positioning. 配置例を示す側面図である。It is a side view which shows the example of arrangement | positioning. 半導体スイッチユニットの内部構成を示す側面図である。It is a side view which shows the internal structure of a semiconductor switch unit.

以下に本発明の実施形態を説明する。
図１は実施形態のハイブリッド形電源切替装置の単線結線図である。図示のように、この装置は、開閉器部ユニット１と、半導体スイッチユニット２と、制御部ユニット３とから構成されている。 Embodiments of the present invention will be described below.
FIG. 1 is a single-line diagram of a hybrid power supply switching apparatus according to an embodiment. As shown in the figure, this apparatus is composed of a switch unit 1, a semiconductor switch unit 2, and a control unit 3.

開閉器部ユニット１の内部には、有接点の電源切替開閉器４とＡ電源側のバイパススイッチ１１、Ｂ電源側のバイパススイッチ１２が収納されている。この電源切替開閉器４は、可動接触子６，７を揺動させてＡ接点５aとＢ接点５ｂの何れかに選択的に接触させる構造であり、それ自体は公知の機器である。接点５a，５ｂは負荷電源端子８に接続されており、Ａ側可動接触子６はＡ電源側端子９に、Ｂ側可動接触子７はＢ電源側端子１０にそれぞれ接続されている。このため、可動接触子６，７を作動させることにより電源回路を切り替えることができるが、１５ｍｓ程度の電源切替え時間を要することは、前述したとおりである。   In the switch unit 1, a contact power switching switch 4, a bypass switch 11 on the A power supply side, and a bypass switch 12 on the B power supply side are housed. The power supply switching switch 4 has a structure in which the movable contacts 6 and 7 are oscillated to selectively come into contact with either the A contact 5a or the B contact 5b, and is itself a known device. The contacts 5a and 5b are connected to a load power source terminal 8, the A side movable contact 6 is connected to the A power source side terminal 9, and the B side movable contact 7 is connected to the B power source side terminal 10. For this reason, although the power supply circuit can be switched by operating the movable contacts 6 and 7, as described above, the power supply switching time of about 15 ms is required.

また、Ａ電源側端子９と負荷電源端子８との間にはＡ電源側のバイパススイッチ１１が、Ｂ電源側端子１０と負荷電源端子８との間にはＢ電源側のバイパススイッチ１２がそれぞれ設けられている。これらのバイパススイッチ１１、１２としては、通電能力を備えた手動負荷開閉器を用いている。図１の状態では可動接触子６がＡ接点５ａと接触しているので、Ａ電源側端子９と負荷電源端子８とは導通状態にあり、Ａ電源（例えば商用電源）から負荷に給電されている。しかしＡ電源側のバイパススイッチ１１をオンとすれば、Ａ電源から負荷への給電を継続したままで可動接触子６をＡ側端子９から切り離すことができる。同様にＢ電源側のバイパススイッチ１２をオンとすれば、Ｂ電源から負荷への給電を継続したままで可動接触子７をＢ側端子１０から切り離すことができる。このように両バイパス方式としたので、Ａ、Ｂ両電源側でバイパス経路を形成することができる。   Further, a bypass switch 11 on the A power supply side is provided between the A power supply side terminal 9 and the load power supply terminal 8, and a bypass switch 12 on the B power supply side is provided between the B power supply side terminal 10 and the load power supply terminal 8. Is provided. As these bypass switches 11 and 12, manual load switches having energization capability are used. In the state of FIG. 1, since the movable contact 6 is in contact with the A contact 5a, the A power supply side terminal 9 and the load power supply terminal 8 are in a conductive state, and power is supplied from the A power supply (for example, commercial power supply) to the load. Yes. However, if the bypass switch 11 on the A power source side is turned on, the movable contact 6 can be disconnected from the A side terminal 9 while the power supply from the A power source to the load is continued. Similarly, if the bypass switch 12 on the B power source side is turned on, the movable contact 7 can be disconnected from the B side terminal 10 while the power supply from the B power source to the load is continued. Since both bypass systems are used in this way, a bypass path can be formed on both the A and B power sources.

半導体スイッチユニット２の内部には、Ａ電源側の半導体スイッチ１３、Ｂ電源側の半導体スイッチ１４、Ａ電源側の電磁接触器１５、Ｂ電源側の電磁接触器１６が収納されている。半導体スイッチ１３はＡ電源側主回路１８によってＡ電源側端子９に接続されており、半導体スイッチ１４はＢ電源側主回路１９によってＢ電源側端子１０に接続されている。また電磁接触器１５、１６は負荷電源端子８に接続されている。停電切替時に半導体スイッチ１３，１４を作動させれば、停電発生から停電検知して５ｍｓ程度で電源回路を切り替えることができる。   Inside the semiconductor switch unit 2 are housed a semiconductor switch 13 on the A power supply side, a semiconductor switch 14 on the B power supply side, an electromagnetic contactor 15 on the A power supply side, and an electromagnetic contactor 16 on the B power supply side. The semiconductor switch 13 is connected to the A power source side terminal 9 by the A power source side main circuit 18, and the semiconductor switch 14 is connected to the B power source side terminal 10 by the B power source side main circuit 19. The electromagnetic contactors 15 and 16 are connected to the load power supply terminal 8. If the semiconductor switches 13 and 14 are operated at the time of power failure switching, a power failure can be detected from the occurrence of a power failure and the power supply circuit can be switched in about 5 ms.

制御部ユニット３の内部には、これらの開閉器部ユニット１と半導体スイッチユニット２とを制御して電源切替を行なわせる電源切替コントローラ２０が収納されている。この電源切替コントローラ２０は、例えばＡ電源（商用電源）が停電したことを感知したとき、直ちに半導体スイッチユニット２のＢ電源側の半導体スイッチ１４をオンとし、Ｂ電源から負荷への給電を行なうとともに、開閉器部ユニット１の内部の電源切替開閉器４のＡ接点６をオフとし、Ｂ接点７をオンとする。その後にＢ電源側の半導体スイッチ１４をオフとする。   Inside the control unit 3 is housed a power switching controller 20 that controls the switch unit 1 and the semiconductor switch unit 2 to switch the power. For example, when the power source switching controller 20 senses that the power source A (commercial power source) has failed, it immediately turns on the semiconductor switch 14 on the B power source side of the semiconductor switch unit 2 to supply power from the B power source to the load. The A contact 6 of the power supply switching switch 4 inside the switch unit 1 is turned off and the B contact 7 is turned on. Thereafter, the semiconductor switch 14 on the B power supply side is turned off.

このように本発明では、停電時に先ず半導体スイッチを作動させて負荷への給電が途切れないようにしたうえで有接点スイッチを切り替えるハイブリッド形としたので、電源切替時間を５ｍｓ以下とすることができ、コンピュータ等の負荷に対しても悪影響が生ずるおそれがない。また、半導体スイッチを通じて負荷に給電する時間は有接点スイッチが切り替わるまでのごく短時間であるから、半導体スイッチが過熱されることもない。しかも負荷への給電がＡ、Ｂ何れの電源から行われている状態においても、バイパススイッチをオンとしてバイパス回路を形成すれば、負荷への給電を継続したまま電源切替開閉器４のメンテナンス作業を行うことができる。   As described above, in the present invention, the power supply switching time can be set to 5 ms or less because the semiconductor switch is first operated in the event of a power failure so that the power supply to the load is not interrupted and the contact switch is switched. There is no risk of adverse effects on the load on the computer or the like. In addition, since the time for supplying power to the load through the semiconductor switch is a very short time until the contact switch is switched, the semiconductor switch is not overheated. In addition, even when power is supplied to the load from either A or B power supply, if the bypass switch is turned on to form a bypass circuit, maintenance work of the power supply switching switch 4 can be performed while power supply to the load continues. It can be carried out.

このようなメンテナンス作業の作業性を高めるとともに、全体のコンパクト化を図るために、本発明のハイブリッド形電源切替装置は、以下に説明する構造を採用している。図２と図３はその配置例で自由に配置が可能であり、これに限定されるものではない。最も重量のある開閉器部ユニット１は、車輪を備えたスライドベース３１上に搭載されている。開閉器部ユニット１の背面にはプラグ端子３２，３３，３４が設けられており、それぞれＡ電源側主回路端子３５、Ｂ電源側主回路端子３６、負荷主回路端子３７に接続されている。   In order to improve the workability of such maintenance work and reduce the overall size, the hybrid power supply switching apparatus of the present invention adopts the structure described below. 2 and 3 can be freely arranged in the arrangement example, and the present invention is not limited to this. The switch unit 1 having the heaviest weight is mounted on a slide base 31 having wheels. Plug terminals 32, 33, 34 are provided on the back surface of the switch unit 1, and are connected to the A power source side main circuit terminal 35, the B power source side main circuit terminal 36, and the load main circuit terminal 37, respectively.

このため、開閉器部ユニット１を図３に破線で示す位置まで引き出すことによりプラグ端子３２，３３，３４とＡ電源側主回路端子３５、Ｂ電源側主回路端子３６、負荷主回路端子３７との接続を切断し、安全にかつ容易に電源切替開閉器４のメンテナンス作業を行うことができる。   Therefore, by pulling out the switch unit 1 to the position indicated by the broken line in FIG. 3, the plug terminals 32, 33, 34, the A power source side main circuit terminal 35, the B power source side main circuit terminal 36, the load main circuit terminal 37, And the maintenance work of the power switch 4 can be performed safely and easily.

同様に、半導体スイッチユニット２も背後にプラグ端子を備えており、手前に引き出して安全にかつ容易にヒューズ２１，２２の交換作業や、半導体スイッチ１３、１４、電磁接触器１５、１６のメンテナンス作業を行うことができる。なお図４に示すように、半導体スイッチユニット２は開閉器部ユニット１よりも軽量であるから、スライドレール３９に沿って引出し可能となっている。また最上段の制御部ユニット３についても同様である。   Similarly, the semiconductor switch unit 2 is also provided with a plug terminal on the back, and can be pulled out to the front and safely and easily to replace the fuses 21 and 22, or the semiconductor switches 13 and 14 and the electromagnetic contactors 15 and 16 to be maintained. It can be performed. As shown in FIG. 4, since the semiconductor switch unit 2 is lighter than the switch unit 1, it can be pulled out along the slide rail 39. The same applies to the uppermost control unit 3.

以上に詳細に説明したように、本発明のハイブリッド形電源切替装置は、個別に引出し可能とし、全体がコンパクトであってデータセンター等に設置するのに好適である。また各ユニットを独立させて引出し、安全にかつ容易にメンテナンス作業を行うことができる。さらに実施形態のように両側のバイパス回路に、それぞれバイパススイッチ１１、１２を搭載した構造とすれば、無停電でのメンテナンス作業が可能となる。このように本発明のハイブリッド形電源切替装置は、従来の問題点を一掃したものである。   As described in detail above, the hybrid power supply switching device of the present invention can be pulled out individually, is compact in its entirety, and is suitable for installation in a data center or the like. In addition, each unit can be pulled out independently and maintenance work can be performed safely and easily. Further, if the bypass switches 11 and 12 are mounted on the bypass circuits on both sides as in the embodiment, maintenance work without an uninterruptible power is possible. As described above, the hybrid power supply switching device of the present invention eliminates the conventional problems.

１ 開閉器部ユニット
２ 半導体スイッチユニット
３ 制御部ユニット
４ 電源切替開閉器
５ａ Ａ接点
５ｂ Ｂ接点
６ Ａ側可動接触子
７ Ｂ側可動接触子
８ 負荷電源端子
９ Ａ電源側端子
１０ Ｂ電源側端子
１１ Ａ電源側のバイパススイッチ
１２ Ｂ電源側のバイパススイッチ
１３ Ａ電源側の半導体スイッチ
１４ Ｂ電源側の半導体スイッチ
１５ Ａ電源側の電磁接触器
１６ Ｂ電源側の電磁接触器
１８ Ａ電源側主回路
１９ Ｂ電源側主回路
２０ 電源切替コントローラ
２１ ヒューズ
２２ ヒューズ
３１ スライドベース
３２ プラグ端子
３３ プラグ端子
３４ プラグ端子
３５ Ａ電源側主回路端子
３６ Ｂ電源側主回路端子
３７ 負荷主回路端子
３８ バイパス操作スイッチ部
３９ スライドレール DESCRIPTION OF SYMBOLS 1 Switch part unit 2 Semiconductor switch unit 3 Control part unit 4 Power supply switching switch 5a A contact 5b B contact 6 A side movable contact 7 B side movable contact 8 Load power supply terminal 9 A Power supply side terminal 10 B Power supply side terminal 11 A power source side bypass switch 12 B power source side bypass switch 13 A power source side semiconductor switch 14 B power source side semiconductor switch 15 A power source side electromagnetic contactor 16 B power source side electromagnetic contactor 18 A power source side main circuit 19 B power supply side main circuit 20 power supply switching controller 21 fuse 22 fuse 31 slide base 32 plug terminal 33 plug terminal 34 plug terminal 35 A power supply side main circuit terminal 36 B power supply side main circuit terminal 37 load main circuit terminal 38 bypass operation switch part 39 Slide rail

Claims (2)

電源切替開閉器を収納した開閉器部ユニットと、半導体スイッチを収納した半導体スイッチユニットと、電源切替コントローラを収納した制御部ユニットとを、個別に引出し可能にしたことを特徴とするハイブリッド形電源切替装置。   A hybrid power supply switch that features a switch unit that houses a power switch, a semiconductor switch unit that houses a semiconductor switch, and a control unit that houses a power switch controller. apparatus. 前記開閉器部ユニットは、電源切替開閉器の両電源側のバイパス回路に、それぞれバイパススイッチを搭載したものであることを特徴とする請求項１記載のハイブリッド形電源切替装置。   2. The hybrid power source switching device according to claim 1, wherein the switch unit includes a bypass switch in each bypass circuit on both power sources of the power source switching switch.
JP2014076665A 2014-04-03 2014-04-03 Hybrid-type power source switching device Pending JP2015198547A (en)

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662182A (en) * 1969-10-09 1972-05-09 Agie Ag Ind Elektronik Method and apparatus for the uninterrupted switching of at least one alternating-current consumer of a voltage supply source or current supply source to a different voltage supply source or current supply source
JPS55137585U (en) * 1979-03-20 1980-09-30
JPS5684388U (en) * 1979-11-29 1981-07-07
JPS58195476U (en) * 1982-06-21 1983-12-26 富士電機株式会社 Stand with extension rail for drawer-type electrical appliances
JPS6071181U (en) * 1983-10-22 1985-05-20 日新電機株式会社 Interlock device for drawer type equipment
JPS61138308U (en) * 1985-02-14 1986-08-27
JPH04165930A (en) * 1990-10-30 1992-06-11 Fuji Electric Co Ltd Power supply system changeover system
JPH10304598A (en) * 1997-04-22 1998-11-13 Meidensha Corp Power source switching equipment
JP2004080977A (en) * 2002-08-22 2004-03-11 Toshiba Corp System-switching apparatus
JP2008048474A (en) * 2006-08-10 2008-02-28 Kajima Corp Uninterruptible switching device
JP2011502462A (en) * 2007-10-31 2011-01-20 ケィティ、コーポレーション Selection switch device, power supply device using the same, and switching method thereof
WO2012169046A1 (en) * 2011-06-09 2012-12-13 東芝三菱電機産業システム株式会社 Uninterruptible power supply system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662182A (en) * 1969-10-09 1972-05-09 Agie Ag Ind Elektronik Method and apparatus for the uninterrupted switching of at least one alternating-current consumer of a voltage supply source or current supply source to a different voltage supply source or current supply source
JPS55137585U (en) * 1979-03-20 1980-09-30
JPS5684388U (en) * 1979-11-29 1981-07-07
JPS58195476U (en) * 1982-06-21 1983-12-26 富士電機株式会社 Stand with extension rail for drawer-type electrical appliances
JPS6071181U (en) * 1983-10-22 1985-05-20 日新電機株式会社 Interlock device for drawer type equipment
JPS61138308U (en) * 1985-02-14 1986-08-27
JPH04165930A (en) * 1990-10-30 1992-06-11 Fuji Electric Co Ltd Power supply system changeover system
JPH10304598A (en) * 1997-04-22 1998-11-13 Meidensha Corp Power source switching equipment
JP2004080977A (en) * 2002-08-22 2004-03-11 Toshiba Corp System-switching apparatus
JP2008048474A (en) * 2006-08-10 2008-02-28 Kajima Corp Uninterruptible switching device
JP2011502462A (en) * 2007-10-31 2011-01-20 ケィティ、コーポレーション Selection switch device, power supply device using the same, and switching method thereof
WO2012169046A1 (en) * 2011-06-09 2012-12-13 東芝三菱電機産業システム株式会社 Uninterruptible power supply system

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