JPH05146013A - Gas-insulated electrical apparatus - Google Patents
Gas-insulated electrical apparatusInfo
- Publication number
- JPH05146013A JPH05146013A JP3057094A JP5709491A JPH05146013A JP H05146013 A JPH05146013 A JP H05146013A JP 3057094 A JP3057094 A JP 3057094A JP 5709491 A JP5709491 A JP 5709491A JP H05146013 A JPH05146013 A JP H05146013A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- conductor
- insulated electric
- electric device
- high frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Gas-Insulated Switchgears (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ガス絶縁電気機器、特
に変電所内に生ずるサージ電圧を抑制することができる
ガス絶縁電気機器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to gas-insulated electric equipment, and more particularly to gas-insulated electric equipment capable of suppressing surge voltage generated in a substation.
【０００２】[0002]
【従来の技術】変電所などに用いられるガス絶縁電気機
器として、ガス絶縁開閉装置が使用されている。このガ
ス絶縁開閉装置は、ＳＦ６ガスなどの絶縁性ガスを封入
した接地タンク内に、遮断器，断路器，母線及びその他
の付属機器を収納して構成されている。2. Description of the Related Art Gas-insulated switchgears are used as gas-insulated electrical equipment used in substations and the like. This gas-insulated switchgear is configured by accommodating a circuit breaker, a disconnector, a busbar, and other auxiliary equipment in a grounding tank filled with an insulating gas such as SF6 gas.
【０００３】このガス絶縁開閉装置においては、遮断器
や断路器の開閉操作により、装置内に高周波サージが発
生する。特に、断路器の開閉時に発生するサージ電圧
は、周波数も数ＭＨｚ〜数十ＭＨｚ程度と高く発生頻度
も高い。この高周波サージは、過電圧発生による絶縁耐
力の低下や放電事故を誘起することから、その抑制が望
まれている。In this gas-insulated switchgear, a high-frequency surge is generated in the switchgear or disconnector by opening or closing the switch. In particular, the surge voltage generated when the disconnector is opened and closed has a high frequency of several MHz to several tens of MHz and a high frequency of occurrence. This high-frequency surge induces a decrease in dielectric strength due to overvoltage and induces a discharge accident, so suppression thereof is desired.
【０００４】従来の対策法としては、例えば、特開昭61
-254011 号公報に示されているように主電流通路となる
通電導体の周囲に磁性体を配置することが提案されてい
る。A conventional countermeasure is, for example, Japanese Patent Laid-Open No. 61
As disclosed in Japanese Patent Publication No. 254011, it has been proposed to dispose a magnetic body around a current-carrying conductor that serves as a main current path.
【０００５】[0005]
【発明が解決しようとする課題】上記従来技術において
は、通常、電力供給時に主電流通路となる通電導体の周
囲に磁性体を配置しているので、通常の通電時にこの磁
性体に電流が常に鎖交する。このため、磁性体は、磁気
的に飽和状態になる。この状態において、高周波サージ
が侵入してきた時に、磁性体は前述した磁気飽和状態の
ために、本来の高周波サージ吸収能力が損なわれている
ので、高周波サージを吸収することができないという問
題があった。その結果、信頼性の高いガス絶縁電気機器
を提供することができなかった。In the above-mentioned prior art, since the magnetic body is usually arranged around the current-carrying conductor which becomes the main current path when power is supplied, the current always flows in this magnetic body during normal power-supply. Interlink. Therefore, the magnetic substance is magnetically saturated. In this state, when the high frequency surge invades, the original high frequency surge absorption capability of the magnetic body is impaired due to the above-mentioned magnetic saturation state, so there is a problem that the high frequency surge cannot be absorbed. .. As a result, highly reliable gas-insulated electrical equipment cannot be provided.
【０００６】本発明は、上述の事柄にもとづいてなされ
たもので、高周波サージに対しても信頼性の高いガス絶
縁電気機器を提供することを目的とする。The present invention has been made based on the above-mentioned matters, and an object of the present invention is to provide a gas-insulated electric device having high reliability against high frequency surges.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記の目的を
達成するために、絶縁性ガスを封入した接地タンク内
に、通電導体を配置したガス絶縁電気機器において、前
記主電流通路となる通電導体から分岐する分岐導体に、
高周波サージ抑制部を設けたものである。In order to achieve the above object, the present invention provides the main current passage in a gas-insulated electric device in which a current-carrying conductor is arranged in a grounding tank filled with an insulating gas. To the branch conductor that branches from the current-carrying conductor,
The high frequency surge suppressor is provided.
【０００８】[0008]
【作用】高周波サージ抑制部は、主電流通路となる通電
導体から分岐する分岐導体に、設けたので、通常の電力
供給時に磁気飽和の影響を受けず、高周波サージを確実
に吸収し得る状態に維持されていると共に、分岐導体の
端部は対地静電容量の大きい部分に接続されるので、こ
の分岐導体は通電導体に対しインピーダンスが小さくな
り、商用周波を流しにくく、高周波を流し易くなる。こ
のような分岐導体の設置とこれに設けた高周波サージ抑
制部とにより、高周波サージを吸収し抑制することがで
きる。The high-frequency surge suppressor is provided on the branch conductor branching from the current-carrying conductor serving as the main current path, so that the high-frequency surge can be reliably absorbed without being affected by magnetic saturation during normal power supply. Since the branch conductor is maintained and the end portion of the branch conductor is connected to a portion having a large electrostatic capacitance to ground, the branch conductor has a smaller impedance than the current-carrying conductor, and it is difficult to flow commercial frequency and it is easy to flow high frequency. The installation of such a branch conductor and the high frequency surge suppressor provided therein can absorb and suppress the high frequency surge.
【０００９】[0009]
【実施例】以下に本発明の実施例を図面を用いて説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１は、本発明の一実施例を示すもので、
この実施例はブッシング１を介して送電するガス絶縁開
閉装置の送電線ユニットに本発明を適用したものであ
る。この例は母線のみが３相一括形に構成され、その他
が相分離形に構成されているものである。このガス絶縁
開閉装置の基本的な構成は、付設面１に並置された母線
２のタンク内にそれぞれ３相の母線導体３が収納されて
いる。各母線２の上部には母線用断路器４が設けられて
いる。これらの母線用断路器４は接続母線５によって接
続されている。図面上、右側の母線用断路器４には接地
装置６が設けられている。左側の母線用断路器４は接続
母線７によって遮断器８の一方側に設けた変流器９に接
続されている。遮断器８の他方側に設けた変流器１０は
線路用断路器１１，接地装置１２を備える接続母線１３
の一方に接続している。遮断器８の下方には操作機が設
けられている。接続母線１３の他方には、接地装置１５
を備える接続母線１６が接続されている。この接続母線
１６には、付設面１に設けた電圧変成器１７が接続され
ている。接続母線１６の他方には、接続母線１８が接続
されている。この接続母線１８には、付設面１に設けた
避雷器１９が接続されている。この接続母線１８にブッ
シング１が接続されている。前述した母線２、母線用断
路器４、接続母線５，７、変流器９，１０、遮断器８、
接続母線１３，１６，１８、電圧変成器１７、避雷器１
９等は絶縁性ガスを封入しており、絶縁スペーサ２０よ
って区画されている。符号２１は主電流通路となる母線
導体を示す。FIG. 1 shows an embodiment of the present invention.
In this embodiment, the present invention is applied to a power transmission line unit of a gas insulated switchgear that transmits power via a bushing 1. In this example, only the busbars are configured as a three-phase type and the others are configured as a phase-separated type. The basic structure of this gas-insulated switchgear is that the three-phase busbar conductors 3 are housed in the tanks of the busbars 2 juxtaposed on the attachment surface 1. A busbar disconnector 4 is provided above each busbar 2. These busbar disconnectors 4 are connected by a connecting busbar 5. In the drawing, the busbar disconnector 4 on the right side is provided with a grounding device 6. The busbar disconnector 4 on the left side is connected by a connecting busbar 7 to a current transformer 9 provided on one side of the circuit breaker 8. The current transformer 10 provided on the other side of the circuit breaker 8 is a line disconnector 11 and a connecting bus 13 including a grounding device 12.
Connected to one side. An operating device is provided below the circuit breaker 8. A grounding device 15 is provided on the other side of the connecting bus bar 13.
Is connected to the connection bus bar 16. A voltage transformer 17 provided on the attachment surface 1 is connected to the connecting bus 16. The connection bus bar 18 is connected to the other side of the connection bus bar 16. A lightning arrester 19 provided on the attachment surface 1 is connected to the connecting bus bar 18. The bushing 1 is connected to the connecting bus 18. The busbar 2, the busbar disconnector 4, the connecting busbars 5 and 7, the current transformers 9 and 10, the circuit breaker 8 described above,
Connection buses 13, 16, 18, voltage transformer 17, lightning arrester 1
9 and the like are filled with an insulating gas and are partitioned by an insulating spacer 20. Reference numeral 21 indicates a bus conductor serving as a main current passage.
【００１１】この実施例においては、母線導体２１から
分岐し避雷器１９の入口部にある絶縁スペーサ２０に通
じる分岐導体２２の周囲に、高周波サージ抑制部となる
磁性体２３が配置されている。この磁性体２３は主電流
通路となる母線導体２１から分岐した分岐導体２３に設
けられて、通常の通電時に磁気飽和を生じないように配
慮されている。また、分岐導体２３は避雷器１９を通し
て対地静電容量の大きな部分に接続されているので、こ
の部分のインピーダンスの値が小さくなっている。その
結果、この部分では、商用周波は流れにくく、高周波は
流れ易くなっている。In this embodiment, a magnetic material 23 serving as a high-frequency surge suppressor is arranged around the branch conductor 22 that branches from the bus conductor 21 and leads to the insulating spacer 20 at the entrance of the lightning arrester 19. The magnetic body 23 is provided on the branch conductor 23 branched from the bus conductor 21 serving as the main current passage, and is designed so as not to cause magnetic saturation during normal energization. Further, since the branch conductor 23 is connected to the portion having a large capacitance to ground through the lightning arrester 19, the impedance value of this portion is small. As a result, in this portion, the commercial frequency is hard to flow, and the high frequency is easy to flow.
【００１２】このように構成したことにより、例えば断
路器５の開閉操作により高周波の開閉サージが発生した
とする。この時の発生サージは周波数が数ＭＨｚ〜数十
MHz程度と非常に高いため、母線導体２１を通して分岐
導体２３から対地静電容量の大きな避雷器１９の方向に
伝搬される。しかしながら、絶縁スペーサ２０の前方に
位置する磁性体２３のサージ吸収能力によってサージ電
圧は吸収される。その結果、絶縁スペーサ２０の沿面で
生じる可能性がある絶縁破壊を防ぐことができる。ま
た、急峻波サージが侵入した場合にも、このサージを吸
収することができる。さらに、反射による残留サージも
確実に吸収するこができる。With such a configuration, it is assumed that a high-frequency switching surge occurs due to the switching operation of the disconnector 5, for example. The frequency of the surge generated at this time is several MHz to several tens.
Since it is as high as MHz, it propagates from the branch conductor 23 through the bus conductor 21 toward the surge arrester 19 having a large ground capacitance. However, the surge voltage is absorbed by the surge absorbing capacity of the magnetic body 23 located in front of the insulating spacer 20. As a result, it is possible to prevent dielectric breakdown that may occur on the surface of the insulating spacer 20. Further, even when a steep wave surge enters, this surge can be absorbed. Further, the residual surge due to reflection can be surely absorbed.
【００１３】図２は、本発明の他の実施例を示すもの
で、この実施例は図１に示す変成器１７の入口部に適用
したものである。具体的には、図２に示すように母線導
体２１から変成器１７に分岐する分岐導体２２に磁性体
２３を設けたものである。このように構成しても、前述
した実施例と同様な効果を得ることができる。FIG. 2 shows another embodiment of the present invention, which is applied to the inlet portion of the transformer 17 shown in FIG. Specifically, as shown in FIG. 2, a magnetic material 23 is provided on a branch conductor 22 that branches from the busbar conductor 21 to the transformer 17. Even with such a configuration, the same effect as that of the above-described embodiment can be obtained.
【００１４】図３は、本発明のさらに他の実施例を示す
もので、この実施例は、母線導体２１から接地装置１２
等に分岐する分岐導体２２に、磁性体２３を設けたもの
である。分岐導体２２は接地装置１２の固定接触子１２
Ａに接続している。FIG. 3 shows still another embodiment of the present invention, in which the bus conductor 21 to the grounding device 12 are used.
The magnetic conductor 23 is provided on the branch conductor 22 that branches into, for example. The branch conductor 22 is the fixed contact 12 of the grounding device 12.
Connected to A.
【００１５】このように構成しても、前述した実施例と
同様な効果を得ることができる。Even with this structure, the same effect as that of the above-described embodiment can be obtained.
【００１６】図４は、本発明の他の実施例を示すもの
で、この実施例は母線２のタンク内の母線導体３を支持
する絶縁支持体２４と母線導体３との間に設けた分岐導
体２２に、磁性体２３を設けたものである。FIG. 4 shows another embodiment of the present invention. In this embodiment, a branch provided between an insulating support 24 for supporting the busbar conductor 3 in the tank of the busbar 2 and the busbar conductor 3. A magnetic body 23 is provided on the conductor 22.
【００１７】このように構成しても、前述した実施例と
同様な効果を得ることができる。Even with this structure, the same effect as that of the above-described embodiment can be obtained.
【００１８】図５は、本発明のさらに他の実施例を示す
もので、この実施例は、母線２のタンクの端部に磁性体
を配置したもので、具体的には母線導体３からの分岐導
体２２を、絶縁スペーサ２０を通して絶縁性ガスを封入
した容器２５内に導入し、分岐導体２２の母線導体３か
らの分岐部と絶縁スペーサ２０との間に、磁性体２３を
設けたものである。磁性体２３は母線２のタンクの内面
に設けた支持体２６によって支持されている。FIG. 5 shows still another embodiment of the present invention. In this embodiment, a magnetic material is arranged at the end of the tank of the bus bar 2, specifically, from the bus bar conductor 3. The branch conductor 22 is introduced into a container 25 filled with an insulating gas through the insulating spacer 20, and the magnetic body 23 is provided between the branch portion of the branch conductor 22 from the busbar conductor 3 and the insulating spacer 20. is there. The magnetic body 23 is supported by a support body 26 provided on the inner surface of the tank of the bus bar 2.
【００１９】このように構成したことにより、例えば、
断路器４の開閉により発生したサージ電圧は母線導体３
を伝搬して絶縁スペーサ２０に到達しようとするが、磁
性体２３によって吸収されてしまい、絶縁スペーサ２０
の沿面での絶縁破壊を防ぐことができる。With this configuration, for example,
The surge voltage generated by opening and closing the disconnector 4 is
To reach the insulating spacer 20, but is absorbed by the magnetic substance 23, and the insulating spacer 20
It is possible to prevent dielectric breakdown on the surface of.
【００２０】なお、上述の実施例は、３相一括母線の例
を示したが単相母線の場合にも同様に適用することがで
きる。また、磁性体として、フェライトコアを用いるこ
ともできるし、磁性体粉末をモールドしたモールド体を
用いることもできる。さらに、磁性体２３は前述した配
置個所を組合せて配置しても良い。Although the above-described embodiment shows an example of a three-phase bus bar, it can be similarly applied to a single-phase bus bar. Further, a ferrite core may be used as the magnetic body, or a molded body obtained by molding magnetic powder may be used. Further, the magnetic body 23 may be arranged by combining the above-mentioned arrangement positions.
【００２１】[0021]
【発明の効果】本発明によれば、高周波サージを吸収す
る磁性体の電力供給時には、通電していない導体に配置
したので、その磁気飽和が防止され、高周波サージを効
果的に吸収することができる。その結果、信頼性の高い
ガス絶縁電気機器を提供することができる。According to the present invention, when a magnetic material that absorbs high frequency surges is placed on a non-energized conductor when power is supplied, magnetic saturation is prevented, and high frequency surges can be effectively absorbed. it can. As a result, highly reliable gas-insulated electrical equipment can be provided.
【図１】本発明の一実施例を一部断面にて示す正面図で
ある。FIG. 1 is a front view showing an embodiment of the present invention in a partial cross section.
【図２】本発明の他の実施例を示す断面図である。FIG. 2 is a sectional view showing another embodiment of the present invention.
【図３】本発明の更に他の実施例を示す断面図である。FIG. 3 is a sectional view showing still another embodiment of the present invention.
【図４】本発明の他の実施例を示す断面図である。FIG. 4 is a sectional view showing another embodiment of the present invention.
【図５】本発明の更に他の実施例を示す断面図である。FIG. 5 is a sectional view showing still another embodiment of the present invention.
１…ブッシング、２…母線、３…母線導体、４…母線用
断路器、５，７，１３，１６，１８…接続母線、６，１
２，１５…接地装置、８…遮断器、９，１０…変流器、
１１…断路器、１４…操作機、１７…変成器、１９…避
雷器、２０…絶縁スペーサ、２１…母線導体、２２…分
岐導体、２３…磁性体、２４…絶縁支持体、２５…容
器。DESCRIPTION OF SYMBOLS 1 ... Bushing, 2 ... Busbar, 3 ... Busbar conductor, 4 ... Busbar disconnector, 5,7,13,16,18 ... Connection busbar, 6,1
2, 15 ... Grounding device, 8 ... Circuit breaker, 9, 10 ... Current transformer,
11 ... Disconnector, 14 ... Operating device, 17 ... Transformer, 19 ... Lightning arrester, 20 ... Insulation spacer, 21 ... Bus conductor, 22 ... Branch conductor, 23 ... Magnetic material, 24 ... Insulating support, 25 ... Container.
Claims (11)
電導体を配置したガス絶縁電気機器において、前記主電
流通路となる通電導体から分岐する分岐導体に、高周波
サージ抑制部を設けたことを特徴としたガス絶縁電気機
器。1. In a gas-insulated electric device in which a conducting conductor is arranged in a grounding tank filled with an insulating gas, a high frequency surge suppressor is provided on a branch conductor branched from the conducting conductor serving as the main current passage. Gas-insulated electrical equipment characterized by.
電導体を配置し、前記通電導体に分岐導体を介して避雷
器を接続したガス絶縁電気機器において、前記分岐導体
に、高周波サージ抑制部を設けたことを特徴としたガス
絶縁電気機器。2. A gas-insulated electric device in which a conducting conductor is arranged in a grounding tank filled with an insulating gas, and a surge arrester is connected to the conducting conductor via a branch conductor. A gas-insulated electric device characterized by being provided with.
電導体を配置し、前記通電導体に分岐導体を介して電圧
変成器を接続したガス絶縁電気機器において、前記分岐
導体に、高周波サージ抑制部を設けたことを特徴とした
ガス絶縁電気機器。3. A gas-insulated electric device in which a conducting conductor is arranged in a grounding tank filled with an insulating gas, and a voltage transformer is connected to the conducting conductor via a branch conductor. A gas-insulated electric device characterized by having a suppression unit.
電導体を配置し、前記通電導体に分岐導体を介して接地
装置を接続したガス絶縁電気機器において、前記分岐導
体に、高周波サージ抑制部を設けたことを特徴としたガ
ス絶縁電気機器。4. A gas-insulated electric device in which a conducting conductor is arranged in a grounding tank filled with an insulating gas, and a grounding device is connected to the conducting conductor via a branching conductor. Gas-insulated electric equipment characterized by having a section.
電導体を配置したガス絶縁電気機器において、前記通電
導体に、これから分岐する分岐導体を設け、この分岐導
体の端部と接地タンクの内面との間に絶縁支持物を設
け、前記分岐導体に、高周波サージ抑制部を設けたこと
を特徴としたガス絶縁電気機器。5. In a gas-insulated electric device in which a conducting conductor is arranged in a grounding tank filled with an insulating gas, a branching conductor branching from the conducting conductor is provided, and the end of the branching conductor and the grounding tank are connected to each other. A gas-insulated electric device comprising an insulating support provided between the branch conductor and a high frequency surge suppressor.
電導体を配置したガス絶縁電気機器において、前記通電
導体にこの通電導体から分岐する分岐導体を接続し、こ
の分岐導体の端部を絶縁スペーサによって支持して、絶
縁性ガスを封入した容器に導入し、前記分岐導体の通電
導体からの分岐部と前記絶縁スペーサとの間に、高周波
サージ抑制部を設けたことを特徴とするガス絶縁電気機
器。6. In a gas-insulated electric device in which a conducting conductor is arranged in a grounding tank filled with an insulating gas, a branch conductor branched from the conducting conductor is connected to the conducting conductor, and an end portion of the branch conductor is connected. A gas, which is supported by an insulating spacer and is introduced into a container in which an insulating gas is sealed, and a high frequency surge suppressor is provided between the insulating spacer and a branch portion of the branch conductor from a current-carrying conductor. Isolated electrical equipment.
電導体を配置したガス絶縁電気機器において、前記通電
導体に、対地静電容量の大きな部分に分岐される分岐導
体を設け、この分岐導体に、高周波サージ抑制部を設け
たことを特徴とするガス絶縁電気機器。7. A gas-insulated electric device in which a current-carrying conductor is arranged in a grounding tank filled with an insulating gas, wherein the current-carrying conductor is provided with a branch conductor branched to a portion having a large ground capacitance. A gas-insulated electric device comprising a conductor provided with a high-frequency surge suppressor.
線及びその他の付属機器を、接地タンク内に収納して構
成したガス絶縁開閉装置であることを特徴とする請求項
１乃至７記載のガス絶縁電気機器。8. The gas-insulated electric device is a gas-insulated switchgear in which a circuit breaker, a disconnecting switch, a bus bar, and other accessory devices are housed in a grounded tank. Gas-insulated electrical equipment as described.
を特徴とする請求項１乃至７記載のガス絶縁電気機器。9. The gas-insulated electric device according to claim 1, wherein the high frequency surge suppressor is a magnetic material.
であることを特徴とする請求項１乃至７記載のガス絶縁
電気機器。10. The gas-insulated electric device according to claim 1, wherein the high frequency surge suppressor is a ferrite core.
填したモールド体であることを特徴とする請求項１乃至
７記載のガス絶縁電気機器。11. The gas-insulated electric device according to claim 1, wherein the high frequency surge suppressor is a molded body filled with magnetic powder.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03057094A JP3074755B2 (en) | 1991-03-20 | 1991-03-20 | Gas insulated electrical equipment |
| KR1019910021222A KR970002006B1 (en) | 1990-11-30 | 1991-11-26 | Surge suppression of electric apparatus |
| AU88231/91A AU644244B2 (en) | 1990-11-30 | 1991-11-27 | Surge suppression in electric apparatus |
| EP91310967A EP0488695B1 (en) | 1990-11-30 | 1991-11-27 | Surge suppression in electric apparatus |
| DE69125250T DE69125250T2 (en) | 1990-11-30 | 1991-11-27 | Suppression of overvoltages in electrical devices |
| CN91111255A CN1048592C (en) | 1990-11-30 | 1991-11-30 | Surge suppression in electric apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03057094A JP3074755B2 (en) | 1991-03-20 | 1991-03-20 | Gas insulated electrical equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05146013A true JPH05146013A (en) | 1993-06-11 |
| JP3074755B2 JP3074755B2 (en) | 2000-08-07 |
Family
ID=13045921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03057094A Expired - Fee Related JP3074755B2 (en) | 1990-11-30 | 1991-03-20 | Gas insulated electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3074755B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101474271B1 (en) * | 2014-03-07 | 2014-12-18 | 김달원 | Portable cleaner |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5627808U (en) * | 1979-08-08 | 1981-03-16 | ||
| JPS6141367U (en) * | 1985-07-04 | 1986-03-15 | 三菱電機株式会社 | turbine generator |
| JPS6166510A (en) * | 1984-09-05 | 1986-04-05 | 株式会社日立製作所 | Gas insulated electric device |
| JPS61254011A (en) * | 1985-05-02 | 1986-11-11 | 株式会社日立製作所 | Gas insulated switchgear |
| JPH0266904A (en) * | 1988-09-01 | 1990-03-07 | Sumitomo Bakelite Co Ltd | Plastic magnet molding form |
| JPH0272603A (en) * | 1988-09-08 | 1990-03-12 | Tamagawa Seiki Co Ltd | Core |
| JPH02164208A (en) * | 1988-12-16 | 1990-06-25 | Toshiba Corp | Gas insulated switchgear |
| JPH02260402A (en) * | 1989-03-30 | 1990-10-23 | Hitachi Metals Ltd | Cylindrical resin magnet assembly and its manufacture |
| JPH0382305A (en) * | 1989-08-24 | 1991-04-08 | Toshiba Corp | Gas-insulated switchgear |
-
1991
- 1991-03-20 JP JP03057094A patent/JP3074755B2/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5627808U (en) * | 1979-08-08 | 1981-03-16 | ||
| JPS6166510A (en) * | 1984-09-05 | 1986-04-05 | 株式会社日立製作所 | Gas insulated electric device |
| JPS61254011A (en) * | 1985-05-02 | 1986-11-11 | 株式会社日立製作所 | Gas insulated switchgear |
| JPS6141367U (en) * | 1985-07-04 | 1986-03-15 | 三菱電機株式会社 | turbine generator |
| JPH0266904A (en) * | 1988-09-01 | 1990-03-07 | Sumitomo Bakelite Co Ltd | Plastic magnet molding form |
| JPH0272603A (en) * | 1988-09-08 | 1990-03-12 | Tamagawa Seiki Co Ltd | Core |
| JPH02164208A (en) * | 1988-12-16 | 1990-06-25 | Toshiba Corp | Gas insulated switchgear |
| JPH02260402A (en) * | 1989-03-30 | 1990-10-23 | Hitachi Metals Ltd | Cylindrical resin magnet assembly and its manufacture |
| JPH0382305A (en) * | 1989-08-24 | 1991-04-08 | Toshiba Corp | Gas-insulated switchgear |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3074755B2 (en) | 2000-08-07 |
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| LAPS | Cancellation because of no payment of annual fees |