JPH11273478A - Capacitor bushing and electric characteristic measuring method for capacitor core - Google Patents
Capacitor bushing and electric characteristic measuring method for capacitor coreInfo
- Publication number
- JPH11273478A JPH11273478A JP10072025A JP7202598A JPH11273478A JP H11273478 A JPH11273478 A JP H11273478A JP 10072025 A JP10072025 A JP 10072025A JP 7202598 A JP7202598 A JP 7202598A JP H11273478 A JPH11273478 A JP H11273478A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- measuring
- bushing
- core
- electrode foil
- 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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- Insulators (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、コンデンサブッシ
ングおよびそのコンデンサコアの電気特性の測定方法の
改良に関するものであって、特に、導電釉碍管を用いた
コンデンサブッシングのコンデンサコアの誘電正接の測
定に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor bushing and an improvement in a method of measuring electric characteristics of the capacitor core, and more particularly to a measurement of a dielectric loss tangent of the capacitor core of the capacitor bushing using a conductive glaze tube. .
【０００２】[0002]
【従来の技術】従来、コンデンサブッシング中のコンデ
ンサコアを構成する絶縁物層、例えば油浸紙あるいはレ
ジン含浸紙など絶縁物の電気特性、特にその絶縁抵抗と
誘電率とに関連する物性値である誘電正接は、物質特有
の値として品質管理上重要な管理項目とされている。2. Description of the Related Art Conventionally, the electrical properties of an insulator layer constituting a capacitor core in a capacitor bushing, for example, an insulator such as an oil-impregnated paper or a resin-impregnated paper, are physical properties related to its insulation resistance and dielectric constant. The dielectric loss tangent is an important management item in quality control as a value specific to a substance.
【０００３】ここで誘電正接とは、絶縁物に交流電圧を
印加したときに流れる電流のうち、静電容量に基づく電
流ＩC と絶縁内部抵抗に基づく電流ＩR との比ＩR ／Ｉ
C （％）で表される値であり、吸湿などにより絶縁物の
絶縁抵抗が低下すると、これに基づく電流ＩR が増加
し、誘電正接の値が高くなるので、この誘電正接の値は
絶縁物の品質の重要な指標となるものである。Here, the dielectric loss tangent is a ratio IR / I of the current IC based on the capacitance and the current IR based on the insulation internal resistance, of the current flowing when an AC voltage is applied to the insulator.
When the insulation resistance of the insulator decreases due to moisture absorption, etc., the current IR increases and the value of the dielectric loss tangent increases. Is an important indicator of quality.
【０００４】このような品質の指標となる誘電正接の測
定をコンデンサブッシングの品質試験に適用しようとす
ると、外気湿度が高い場合あるいは碍管の表面が汚損さ
れている場合には、碍管表面を流れる漏れ電流が加算さ
れて測定されるため、測定対象であるコンデンサコアの
誘電正接が測定できないことになる。When an attempt is made to apply such a measurement of dielectric loss tangent as an indicator of quality to a quality test of a capacitor bushing, if the outside air humidity is high or if the surface of the insulator tube is contaminated, the leakage flowing through the insulator tube surface will be reduced. Since the current is added and measured, the dielectric loss tangent of the capacitor core to be measured cannot be measured.
【０００５】そこで、図２に示すように、下部をフラン
ジ金具１１に固着した碍管１０の先端部分に設けられた
頭部電極金具１２から垂下する中心導体１３の周囲にコ
ンデンサコア１４を収容、配置してなるコンデンサブッ
シングの場合、そのフランジ金具１１を接地して表面漏
れ電流の影響を排除するガード電極とし、そのコンデン
サコアの最外周の電極箔１５に接続された試験端子１６
を用いて、誘電正接を測定する方法が用いられている。Therefore, as shown in FIG. 2, a capacitor core 14 is accommodated and arranged around a central conductor 13 which is suspended from a head electrode fitting 12 provided at a distal end portion of a porcelain tube 10 having a lower portion fixed to a flange fitting 11. In the case of the capacitor bushing, the flange metal fitting 11 is grounded to serve as a guard electrode for eliminating the influence of surface leakage current, and the test terminal 16 connected to the outermost electrode foil 15 of the capacitor core is provided.
Is used to measure the dielectric loss tangent.
【０００６】ところが、この場合でも、コンデンサコア
と碍管表面との間には、浮遊静電容量が形成されている
ので、上記のガード電極を用いても、漏れ電流の一部は
この浮遊静電容量を通じてコンデンサコアに流入してし
まうから、誘電正接の値はその分大きく測定されること
になる。However, even in this case, since a floating capacitance is formed between the capacitor core and the surface of the insulator tube, even if the above guard electrode is used, a part of the leakage current is reduced by the floating capacitance. Since the dielectric tangent flows into the capacitor core through the capacitance, the value of the dielectric loss tangent is measured to be larger accordingly.
【０００７】従って、この方法を採用するときには、碍
管を清掃したうえ乾燥した状態に保って碍管表面の漏れ
電流を微小にすることが必要であった。このため、ブッ
シングが設置されている変電所などの屋外では、誘電正
接測定のために碍管表面の汚損を除去することは実質上
困難であるから、この誘電正接を品質管理上、活用する
ことはほとんど不可能であった。Therefore, when this method is employed, it is necessary to clean the insulator tube and keep it dry so as to minimize the leakage current on the surface of the insulator tube. For this reason, it is practically difficult to remove the dirt on the insulator tube surface for dielectric loss tangent measurement outdoors, such as in a substation where a bushing is installed.Therefore, this dielectric loss tangent cannot be used for quality control. It was almost impossible.
【０００８】一方、近年、導電釉を施した碍管の優れた
耐汚損性能が注目されている。通常の碍管は、表面が海
塩などで汚損された場合、耐電圧が大幅に低下するの
で、そのような汚損を受けやすい重汚損地域では、その
汚損を見込んだ長大な碍管を必要としていた。しかし、
最近開発された導電釉を施した碍管は、汚損状態でも耐
電圧特性が良好であり、通常の碍管のように全長を長く
しないで済むという利点があるからである。On the other hand, in recent years, attention has been paid to the excellent antifouling performance of insulator tubes provided with a conductive glaze. When the surface of a normal porcelain pipe is contaminated with sea salt or the like, the withstand voltage is greatly reduced. Therefore, a heavy porcelain pipe which requires such a large amount of porcelain is required in a heavyly polluted area which is susceptible to such contamination. But,
This is because the newly developed insulator with conductive glaze has good withstand voltage characteristics even in a soiled state, and has the advantage that the overall length does not need to be lengthened as in a normal insulator.
【０００９】ところが、このような導電釉碍管を用いた
コンデンサブッシングでは、もともと碍管表面の絶縁抵
抗が低く設定してあるから、如上の漏れ電流を微小なも
のにすることが不可能なため、先に説明した方法ではコ
ンデンサコアに誘電正接を測定できず、品質管理上の解
決課題となっていた。However, in such a capacitor bushing using a conductive glaze insulator, since the insulation resistance of the insulator surface is originally set to be low, it is impossible to make the leakage current as small as possible. According to the method described in (1), the dielectric loss tangent cannot be measured on the capacitor core, which is a problem in quality control.
【００１０】[0010]
【発明が解決しようとする課題】本発明は、上記の問題
点を解決するためになされたものであり、碍管の表面状
態の如何に関わらず、コンデンサコアを構成する絶縁物
のみの誘電正接を測定することが可能となるコンデンサ
ブッシングおよびコンデンサブッシングの内部の電気特
性の測定方法を提供する。SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and is intended to reduce the dielectric loss tangent of only the insulator constituting the capacitor core regardless of the surface condition of the insulator tube. Provided is a capacitor bushing capable of measuring and a method of measuring electric characteristics inside the capacitor bushing.
【００１１】[0011]
【課題を解決するための手段】上記の問題を解決するた
めになされた本発明のコンデンサブッシングは、下部を
接地したフランジ金具に固着した碍管の先端部分に設け
られた頭部電極金具から垂下する中心導体の周囲にコン
デンサコアを収容、配置してなるコンデンサブッシング
であって、そのコンデンサコアの最外周の電極箔の外側
において、前記コンデンサコアを構成する絶縁体と同質
の絶縁層を介して測定電極箔を設けてなる測定用コンデ
ンサを、その測定電極箔上端の前記フランジ金具の上端
に対する仰角が４５度以上となるように形成し、前記コ
ンデンサコアの最外周の電極箔に接続された試験端子Ａ
と前記測定用コンデンサの測定電極箔に接続された試験
端子Ｂとを設けたことを特徴とするものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a capacitor bushing of the present invention hangs from a head electrode fitting provided at a tip end portion of a porcelain tube having a lower part fixed to a grounded flange fitting. A capacitor bushing in which a capacitor core is accommodated and arranged around a center conductor, and measured outside an outermost electrode foil of the capacitor core via an insulating layer of the same quality as an insulator constituting the capacitor core. A test capacitor provided with an electrode foil is formed such that an elevation angle of an upper end of the measurement electrode foil with respect to an upper end of the flange bracket is 45 degrees or more, and a test terminal connected to an outermost electrode foil of the capacitor core. A
And a test terminal B connected to the measurement electrode foil of the measurement capacitor.
【００１２】また、上記の問題を解決するためになされ
た本発明のコンデンサブッシングのコンデンサコアの電
気特性の測定方法は、如上のコンデンサブッシングを対
象として、前記コンデンサコアの最外周の電極と前記測
定用コンデンサの電極との間に交流電圧を印加して、静
電容量および絶縁抵抗に基づく電流を測定して誘電正接
を求めることを特徴とするものである。In addition, the method for measuring the electrical characteristics of a capacitor core of a capacitor bushing according to the present invention, which has been made to solve the above-mentioned problem, is directed to the above-described capacitor bushing. An AC voltage is applied between the electrode of the capacitor and a current based on the capacitance and the insulation resistance to measure a dielectric loss tangent.
【００１３】[0013]
【発明の実施の形態】次に、本発明のコンデンサブッシ
ングに係る実施形態を図１を参照して説明する。図１に
おいて、本発明のコンデンサブッシングは、下部を接地
したフランジ金具１１に固着した大気中に露出した碍管
１０の先端部分に設けられた頭部電極金具１２から垂下
する中心導体１３の周囲にコンデンサコア１４を収容、
配置してなるコンデンサブッシングであることは、従来
のブッシングと同様である。Next, an embodiment of a capacitor bushing according to the present invention will be described with reference to FIG. In FIG. 1, a capacitor bushing according to the present invention includes a capacitor around a center conductor 13 hanging from a head electrode fitting 12 provided at a distal end portion of an insulator tube 10 exposed to the atmosphere and fixed to a flange fitting 11 having a lower part grounded. Accommodates the core 14,
The arrangement of the capacitor bushing is the same as the conventional bushing.
【００１４】そして、本発明の特徴的事項は、そのコン
デンサコア１４の最外周の電極箔の外側において、前記
コンデンサコア１４を構成する絶縁体と同質の絶縁層２
を介して測定電極箔２１ａを設けてなる測定用コンデン
サ２１を形成し、前記コンデンサコア１４の最外周の電
極箔に接続された試験端子Ａと前記測定用コンデンサ２
１の測定電極箔に接続された試験端子Ｂとを外部に引き
出して設けた点にある。The characteristic feature of the present invention is that the insulating layer 2 of the same quality as the insulator constituting the capacitor core 14 is provided outside the outermost electrode foil of the capacitor core 14.
, A measuring capacitor 21 having a measuring electrode foil 21a provided therebetween, and a test terminal A connected to the outermost electrode foil of the capacitor core 14 and the measuring capacitor 2
This is in that the test terminal B connected to the first measurement electrode foil is drawn out and provided.
【００１５】また、この場合、その測定用コンデンサ２
１の測定電極箔２１ａ上端から前記フランジ金具１１の
上端に対する仰角（図１に示す角度θ）が４５度以上と
なるような高さに前記測定電極箔２１ａを設定して、測
定用コンデンサ２１を形成すれば、その測定電極箔２１
ａと碍管表面との間には測定誤差の要因となる浮遊静電
容量が完全に存在しなくなるので、特に好ましい。In this case, the measuring capacitor 2
The measuring electrode foil 21a is set at a height such that the elevation angle (the angle θ shown in FIG. 1) from the upper end of the first measuring electrode foil 21a to the upper end of the flange fitting 11 is 45 degrees or more. If formed, the measurement electrode foil 21
This is particularly preferable because there is no floating capacitance which causes a measurement error between a and the insulator tube surface.
【００１６】さらに、前記測定用コンデンサ２１の測定
電極箔２１ａに接続された試験端子を独立させて設ける
のではなく、前記フランジ金具１１と測定電極箔２１ａ
とを接続して（図示せず）、このフランジ金具１１を前
記試験端子Ｂとして利用できるようにしてもよい。この
ようにフランジ金具１１をして前記試験端子Ｂを兼用さ
せれば、独立した試験端子Ｂを設けなくてもよいので、
構造が簡単になる利点がある。Further, instead of independently providing test terminals connected to the measurement electrode foil 21a of the measurement capacitor 21, the flange fitting 11 and the measurement electrode foil 21a are not provided.
(Not shown) so that the flange fitting 11 can be used as the test terminal B. If the test terminal B is also used as the flange fitting 11 in this way, it is not necessary to provide an independent test terminal B.
There is an advantage that the structure is simplified.
【００１７】なお、このようにフランジ金具１１をして
試験端子Ｂを兼用させる場合には、誘電正接の測定に何
ら問題はない。しかし、ブッシングの部分放電特性を測
定する際には、試験端子Ａとフランジ金具１１との間に
測定回路を組むことになるが、このとき前記測定用コン
デンサ２１の静電容量が並列に入ることになり、部分放
電検出感度が低下するという事情があるため、この測定
用コンデンサ２１の静電容量は低く抑えておくことが必
要となる。When the flange terminal 11 is used as the test terminal B as described above, there is no problem in measuring the dielectric loss tangent. However, when measuring the partial discharge characteristics of the bushing, a measurement circuit is set up between the test terminal A and the flange fitting 11, and at this time, the capacitance of the measurement capacitor 21 enters in parallel. Therefore, since the partial discharge detection sensitivity is reduced, it is necessary to keep the capacitance of the measuring capacitor 21 low.
【００１８】ここで、本発明のコンデンサブッシングの
コンデンサコアの電気特性の測定方法について説明する
と、本発明は、図１記載の構造からなるコンデンサブッ
シングを用いる方法であって、前記試験端子Ａ、Ｂ間
（フランジ金具１１が試験端子Ｂを兼用するときは、試
験端子Ａとフランジ金具１１の間）に交流電圧を印加
し、前記コンデンサコア１４の最外周の電極箔と前記測
定用コンデンサ２１の測定電極箔２１ａとの間の絶縁層
２を交流電界におき、その両電極間の静電容量および絶
縁抵抗に基づく電流ＩC 、ＩR を測定して誘電正接ＩR
／ＩC を求めるコンデンサコアの電気特性の測定方法で
ある。Here, a method for measuring the electrical characteristics of the capacitor core of the capacitor bushing of the present invention will be described. The present invention is a method using the capacitor bushing having the structure shown in FIG. Between the test terminal A and the flange fitting 11 when the flange fitting 11 also serves as the test terminal B, an AC voltage is applied to measure the outermost electrode foil of the capacitor core 14 and the measurement capacitor 21. The insulating layer 2 between the electrode foil 21a is placed in an AC electric field, and the currents IC and IR based on the capacitance and insulation resistance between the two electrodes are measured to measure the dielectric loss tangent IR.
This is a method for measuring the electrical characteristics of the capacitor core for determining / IC.
【００１９】この場合、誘電正接の測定装置としては、
通常用いられるブリッジ回路としてシェーリングブリッ
ジ回路の他に、簡易シェーリングブリッジが使用でき、
交流電圧としては、１００〜１０００Ｖ、５０または６
０Ｈｚの商用周波電圧を適用すればよい。In this case, as a dielectric loss tangent measuring device,
As a commonly used bridge circuit, in addition to a sharing bridge circuit, a simple sharing bridge can be used,
AC voltage is 100 to 1000 V, 50 or 6
A commercial frequency voltage of 0 Hz may be applied.
【００２０】以上説明した本発明の測定方法では、試験
端子Ｂに接続される測定用コンデンサ２１の電極箔２１
ａと碍管表面とは充分に隔離されるので、浮遊静電容量
は無視できるようになる。また、先に説明したように、
電極箔２１ａとフランジ金具１１との位置関係を設定す
れば測定誤差の要因となる浮遊静電容量を全く考慮する
ことなく、その両電極箔間の絶縁層２のみの誘電正接を
知ることができる。従って、従来誘電正接の測定が困難
だった導電釉碍管を用いたコンデンサブッシングについ
てもその誘電正接を測定できるようになった。In the measuring method of the present invention described above, the electrode foil 21 of the measuring capacitor 21 connected to the test terminal B is used.
Since a is sufficiently separated from the insulator tube surface, the floating capacitance becomes negligible. Also, as explained earlier,
If the positional relationship between the electrode foil 21a and the flange fitting 11 is set, the dielectric loss tangent of only the insulating layer 2 between the two electrode foils can be known without any consideration of the stray capacitance which causes a measurement error. . Therefore, it has become possible to measure the dielectric loss tangent of a capacitor bushing using a conductive glaze tube, which was difficult to measure in the past.
【００２１】そして、その両電極箔間の絶縁層２は、コ
ンデンサコア１４の絶縁物と同一材質のものが用いら
れ、かつ同一環境に置かれ、同一の履歴を持つものであ
るから、そこから得られた電気特性は、コンデンサコア
１４の性質をよく代表するのである。かくして、前記碍
管として、所定の微弱な導電性を備えた導電釉を施した
碍管を適用した場合であっても、問題なく誘電正接を求
めることができるから、通常の碍管の場合と同様に管理
することができるのである。The insulating layer 2 between the two electrode foils is made of the same material as the insulator of the capacitor core 14, is placed in the same environment, and has the same history. The obtained electrical characteristics well represent the properties of the capacitor core 14. Thus, even when an insulator with a predetermined weak conductivity is used as the insulator, the dielectric loss tangent can be obtained without any problem. You can do it.
【００２２】[0022]
【発明の効果】本発明のコンデンサブッシングおよびコ
ンデンサブッシングの内部の電気特性の測定方法は、以
上に説明したように構成されているので、碍管の表面状
態の如何に関わらず、コンデンサコアを構成する絶縁物
のみの誘電正接を測定することができるようになり、重
汚染地域に有効な導電釉碍管を用いたコンデンサブッシ
ングについてもその誘電正接の管理が可能となった。よ
って本発明は従来の問題点を解消したコンデンサブッシ
ングおよびコンデンサブッシングの内部の電気特性の測
定方法として、その工業的価値は極めて大なるものがあ
る。The capacitor bushing and the method for measuring the electric characteristics inside the capacitor bushing according to the present invention are constructed as described above, so that the capacitor core is constituted irrespective of the surface condition of the insulator tube. The dielectric loss tangent of only the insulator can be measured, and the dielectric loss tangent of a capacitor bushing using a conductive glaze tube effective in heavy contaminated areas can be managed. Therefore, the present invention has a very large industrial value as a capacitor bushing and a method for measuring the electric characteristics inside the capacitor bushing which have solved the conventional problems.
【図１】本発明の実施形態を説明するためのブッシング
左半分断面略図。FIG. 1 is a schematic cross-sectional view of a left half of a bushing for describing an embodiment of the present invention.
【図２】従来の誘電正接測定方法を説明するためのブッ
シング左半分断面略図。FIG. 2 is a schematic cross-sectional view of a left half of a bushing for explaining a conventional dielectric loss tangent measuring method.
１０ 碍管、１１ フランジ金具、１２ 頭部電極金
具、１３ 中心導体、１４コンデンサコア、２ 絶縁
層、２１ 測定用コンデンサ、２１ａ 測定電極箔Ａ、
Ｂ 試験端子。Reference Signs List 10 insulator tube, 11 flange fitting, 12 head electrode fitting, 13 center conductor, 14 capacitor core, 2 insulating layer, 21 measuring capacitor, 21a measuring electrode foil A,
B Test terminal.
Claims (5)
碍管の先端部分に設けられた頭部電極金具から垂下する
中心導体の周囲にコンデンサコアを収容、配置してなる
コンデンサブッシングであって、そのコンデンサコアの
最外周の電極箔の外側において、前記コンデンサコアを
構成する絶縁体と同質の絶縁層を介して測定電極箔を設
けてなる測定用コンデンサを形成し、前記コンデンサコ
アの最外周の電極箔に接続された試験端子Ａと前記測定
用コンデンサの測定電極箔に接続された試験端子Ｂとを
設けたことを特徴とするコンデンサブッシング。1. A capacitor bushing in which a capacitor core is housed and arranged around a center conductor hanging from a head electrode fitting provided at a tip end portion of a porcelain tube having a lower portion fixed to a grounded flange fitting. Outside the outermost electrode foil of the capacitor core, a measurement capacitor is formed by providing a measurement electrode foil via an insulating layer of the same quality as the insulator constituting the capacitor core, and the outermost electrode of the capacitor core is formed. A capacitor bushing comprising: a test terminal A connected to a foil; and a test terminal B connected to a measurement electrode foil of the measurement capacitor.
の前記フランジ金具の上端に対する仰角が４５度以上と
なるように形成した請求項１に記載のコンデンサブッシ
ング。2. The capacitor bushing according to claim 1, wherein an elevation angle of an upper end of the measurement electrode foil of the measurement capacitor with respect to an upper end of the flange bracket is 45 degrees or more.
フランジ金具とを接続してこのフランジ金具を前記試験
端子Ｂとして利用可能とした請求項１また２に記載のコ
ンデンサブッシング。3. The capacitor bushing according to claim 1, wherein the measuring electrode foil of the measuring capacitor is connected to the flange fitting so that the flange fitting can be used as the test terminal B.
求項１または２または３に記載のコンデンサブッシン
グ。4. The capacitor bushing according to claim 1, wherein said insulator tube is an insulator tube provided with conductive glaze.
ンサブッシングを対象として、前記コンデンサコアの最
外周の電極と前記測定用コンデンサの電極との間に交流
電圧を印加して、静電容量および絶縁抵抗に基づく電流
を測定して誘電正接を求めることを特徴とするコンデン
サブッシングのコンデンサコアの電気特性の測定方法。5. A capacitor bushing according to claim 1, wherein an AC voltage is applied between an outermost electrode of said capacitor core and an electrode of said measuring capacitor, and said capacitor is electrically charged. A method for measuring electrical characteristics of a capacitor core of a capacitor bushing, wherein a dielectric loss tangent is obtained by measuring a current based on a capacitance and an insulation resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10072025A JPH11273478A (en) | 1998-03-20 | 1998-03-20 | Capacitor bushing and electric characteristic measuring method for capacitor core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10072025A JPH11273478A (en) | 1998-03-20 | 1998-03-20 | Capacitor bushing and electric characteristic measuring method for capacitor core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11273478A true JPH11273478A (en) | 1999-10-08 |
Family
ID=13477470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10072025A Withdrawn JPH11273478A (en) | 1998-03-20 | 1998-03-20 | Capacitor bushing and electric characteristic measuring method for capacitor core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11273478A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019145139A1 (en) * | 2018-01-26 | 2019-08-01 | Siemens Aktiengesellschaft | Pluggable high-voltage feed-through and electrical device having the pluggable high-voltage feed-through |
-
1998
- 1998-03-20 JP JP10072025A patent/JPH11273478A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019145139A1 (en) * | 2018-01-26 | 2019-08-01 | Siemens Aktiengesellschaft | Pluggable high-voltage feed-through and electrical device having the pluggable high-voltage feed-through |
| US11367545B2 (en) | 2018-01-26 | 2022-06-21 | Siemens Energy Global GmbH & Co. KG | Pluggable high-voltage bushing and electrical device having the pluggable high-voltage bushing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20050607 |