JP4094162B2 - High voltage porcelain insulator - Google Patents

High voltage porcelain insulator Download PDF

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JP4094162B2
JP4094162B2 JP06822199A JP6822199A JP4094162B2 JP 4094162 B2 JP4094162 B2 JP 4094162B2 JP 06822199 A JP06822199 A JP 06822199A JP 6822199 A JP6822199 A JP 6822199A JP 4094162 B2 JP4094162 B2 JP 4094162B2
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Prior art keywords
coating layer
dielectric constant
porcelain insulator
porcelain
glaze
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JP06822199A
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JP2000268653A (en
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宏 野崎
倫生 久保田
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NGK Insulators Ltd
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NGK Insulators Ltd
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【０００１】
【発明の属する技術分野】
本発明は高電圧用磁器がいしに関するものであり、特に、機械的強度と絶縁破壊強度すなわち急峻波強度に優れた高電圧用磁器がいしに関するものである。
【０００２】
【従来の技術】
従来から、架空送電線等の電気絶縁と機械的支持を行う構成部材として、中実がいしや懸垂がいし等の磁器がいしが知られている。これらの磁器がいしは、アルミナ、粘土等の原料を混合、成形して成形体を作製し、作製した成形体の表面に釉薬を塗布した後、釉薬を塗布した成形体を焼成することで作製している。磁器がいしの素地固有の絶縁破壊強度を得るためには、無釉とすることが必要であるが、釉薬を使用することで、素地表面の微小欠陥を埋めること、および、素地との熱膨張率差により内部応力を生じさせることで、磁器がいしの引張強度を発現させている。
【０００３】
【発明が解決しようとする課題】
これらの従来から知られている磁器がいしは、通常の電圧や汚損雰囲気下での使用には十分耐えることができる。しかしながら、より高い電圧が加わる状態、すなわち天然雷の放電による急峻雷インパルス電圧が加わった場合には、これらの従来知られている磁器がいしでは不十分であり、絶縁破壊強さを抜本的に改善する必要があった。
【０００４】
また、急峻波強度特性を高める技術として、本出願人は、釉薬に所定量のＭｎＯなどを加える技術（特開昭６３−２１１５２５号公報）、懸垂がいしにおけるサンドと釉薬の誘電率を規定する技術（特開平９−６３３７９号公報）、磁器にコランダム結晶を含有させる技術（特開平１０−２２８８１８号公報）等を提案しているが、いずれも磁器がいし本体の表面に釉薬を塗布した構造であるため、急峻波強度はある程度改善されるものの、急峻波強度の抜本的な改善を達成することができなかった。
【０００５】
ここで、釉薬は、磁器がいしの原料である長石、アルミナ、坏土のうち長石の配合比率を高め、ガラス相のみを生成するようにしたものである。そのため、釉薬は本質的にはガラスと同等の高い絶縁破壊強度を有するはずであるが、気孔が内在するためその強さは磁器を下回っている。気孔（空気）の誘電率が、周囲のガラス相に比べて小さいので、電位が加わった場合は、気孔に電界が集中するためと考えられる。また、釉薬の誘電率が磁器がいし本体の誘電率よりも低いため、例えば、釉薬が急峻波パルスを印加した時の弱点となっていた。そのため、磁器がいし本体の表面に釉薬を塗布した従来の磁器がいしの構造では、抜本的な改善が難しいことが判明した。
【０００６】
さらに、磁器がいしの構造について、本出願人は、特開平７−２６２８５４号公報において、磁器がいし本体の表面に釉薬を塗布し、その釉薬の上に釉薬よりも絶縁破壊強度の高いコーティング層を設ける技術を開示している。しかし、この例でも、磁器がいし本体の表面には気孔の存在する釉薬を使用するため、上記釉薬の問題を解消することはできなかった。
【０００７】
本発明の目的は上述した課題を解消して、機械的強度を低下させることなく絶縁破壊強度すなわち急峻波強度を向上させた高電圧用磁器がいしを提供しようとするものである。
【０００８】
【課題を解決するための手段】
本発明の高電圧用磁器がいしは、磁器がいし本体と、磁器がいし本体の表面に設けた高誘電率結晶を含有する主として磁器質原料からなる第１のコーティング層と、第１のコーティング層の表面に設けた釉薬からなる第２のコーティング層とからなることを特徴とするものである。
【０００９】
本発明では、磁器がいし本体の表面に高誘電率結晶を含有する主として磁器質原料からなる第１のコーティング層を設けることで、釉薬と等価もしくはそれ以上の圧縮ストレスを磁器がいし本体に与えることができるほか、釉薬の欠点である気孔量を減少させ、機械的、電気的両面より素地の高い固有強度を発現させることができる。また、第１のコーティング層が、好ましくは酸化チタンおよび／またはチタン酸化合物からなる比誘電率が１０以上の高誘電率結晶を含む。これにより、第１のコーティング層の見かけの比誘電率を好ましくは４以上とでき、第１のコーティング層と磁器がいし本体との誘電率の差を小さくでき、第１のコーティング層が急峻波パルス印加時の弱点とならない。さらに、第１のコーティング層の気孔率を第２のコーティング層の気孔率よりも小さくすることで、このことでも第１のコーティング層が急峻波パルス印加時の弱点とならず、好ましい。
【００１０】
【発明の実施の形態】
図１は本発明の磁器がいしの例として懸垂がいしの一例の構成を示す部分断面図である。図１に示す例において、１は磁器からなる懸垂がいし本体、２は磁器がいし本体１の表面に設けた高誘電率結晶を含有する主として磁器質原料からなる第１のコーティング層、３は第１のコーティング層２の表面に設けた釉薬からなる第２のコーティング層、４は第２のコーティング層３に付着させた不定形のサンド、５はキャップ金具、６はピン金具、７はキャップ金具５とサンド４との間およびピン金具６とサンド４との間を接合するセメントである。図１に示す懸垂がいしの構成において、本発明の特徴は、懸垂がいし本体１の表面に所定の第１のコーティング層２を設けた点である。
【００１１】
第１のコーティング層２の原料としては、主として磁器質原料、好ましくは、ＳｉＯ2 ：５０〜６０ｗｔ％、Ａｉ2 Ｏ3 ：２０〜３０ｗｔ％、その他ＭｇＯ、ＣａＯ、Ｋ2 Ｏ＋Ｎａ2 Ｏからなる原料を用いる。この磁器質原料は、従来から釉薬として知られている原料に比べて、ＳｉＯ2 およびＡｌ2 Ｏ3 の添加量において明らかに異なっている。また、上記磁器質原料に対して添加する高誘電率結晶としては、好ましくは１ＭＨｚにおける比誘電率が１０以上の結晶、さらに好ましくは酸化チタンおよび／またはチタン酸化合物（ＭｇＴｉＯ3 、ＣａＴｉＯ3 、ＢａＴｉＯ3 、ＭｇＯ・Ａｌ2 Ｏ3 ・３ＴｉＯ2 ）からなる結晶を使用する。そして、第１のコーティング層２全体の比誘電率は４以上であることが好ましい。これらの構成は急峻波強度向上に寄与する。さらに、第１のコーティング層２の厚さについては特に限定しないが、０．１ｍｍ以上であることが、急峻波特性向上の観点で好ましい。さらにまた、第１のコーティング層２と懸垂がいし本体１との熱膨張率の差についても特に限定しないが、６５０℃において０．１〜０．２％であると機械的強度が向上するため好ましい。
【００１２】
第２のコーティング層３としては、従来から知られている釉薬を使用する。釉薬組成の一例としては、ＳｉＯ2 ：６０〜７０ｗｔ％、Ａｌ2 Ｏ3 ：１０〜２０ｗｔ％、釉薬気泡を除去するため好ましくはＭｎＯ：１ｗｔ％以上の組成があげられる。また、気孔率についても特に限定しないが、第１のコーティング層２の気孔率よりも大きい気孔率をして、第１のコーティング層２が急峻波パルス印加時における弱点とならないよう構成することが好ましい。さらに、厚さについても特に限定しないが、０．５ｍｍを超えると釉薬中に気孔が内在するようになるので、０．５ｍｍ以下とすることが急峻波強度向上の観点から好ましい。図１に示す例のように、懸垂がいしの例では、第２のコーティング層３がサンド４を磁器がいし本体１の頭部の外周面および内周面に接着するために使用される。
【００１３】
第１のコーティング層２は、従来の施釉方法と同様に、磁器がいし本体１上に、磁器がいし本体１と同様の素地を主成分とする原料を泥奨状態にしてディッピングすることで形成される。そのため、第１のコーティング層２の気孔率は真空土練機で押し出した素地の気孔率よりも高くなる。このため、第１のコーティング層２の絶縁破壊強さは素地よりも低下することが避けられない。その結果可能な限り気孔率を減少し、これを補う必要がある。また、磁器がいし本体１を構成する素地の絶縁破壊強さは相当に高いレベルにあることにより、素地と第１のコーティング層２の複合層を考えれば、素地側の分担割合を増大し第１のコーティング層２に加わる電界を、少しでも緩和させることが必要である。このため、第１のコーティング層２には、誘電率が高いことが要求される。
【００１４】
一方、誘電率を高めるために、本発明では、第１のコーティング層２に好ましくは比誘電率１０以上の高誘電率結晶を含有させている。そのような高誘電率結晶としては、酸化チタンの結晶相（比誘電率：ε＝１００）、チタン酸化合物の焼成により得られる結晶相（ＭｇＯ・Ａｌ2 Ｏ3 ・３ＴｉＯ2 、比誘電率：ε＝２０〜１００）があげられる。
【００１５】
ここで、問題となる誘電率やその他の電気的性状の測定について解析する。従来、釉薬の誘電率は流し込みにより成形された試料片を、所定の寸法に加工することにより、その特性を測定している。本発明では、この方法に従って第１のコーティング層２の誘電率を測定すると、その比誘電率が非現実的な値を示すケースが度々あり、実際に、磁器がいし本体１のピンホールに施された第１のコーティング層２の性状を把握することが困難であることを見い出した。そこで、試料片にコーティングされた第１のコーティング層２の誘電率を求めるため、以下に示す方法を用いた。
【００１６】
まず、図２に示す素地の表面にコーティング層を形成したモデルに基づき、第１のコーティング層２の静電容量（Ｃ1 ）を、素地・コーティング複合層の静電容量（Ｃ）と素地の静電容量（Ｃ2 ）を個別に測定し、以下の（１）式より算出する。Ｃ1 が求まれば、第１のコーティング層２の誘電率は以下の（２）式によって求まる。本例では、素地の厚さを出来るだけ薄くし、Ｃ2 の値を大きくすることにより、Ｃの値との差を大きくし、第１のコーティング層２の誘電率の測定精度を上げた。具体的には、素地の厚さを１ｍｍとし、Ｃ2 の値を６１．５ｐＦとした。
【数１】

Figure 0004094162
【００１７】
実際に、磁器がいし本体１の表面に第１のコーティング層および第２のコーティング層を形成した本発明の磁器がいしであって第１のコーティング層の誘電率を変えた磁器がいしを準備し、峻度２５００ｋＶ／μｓの急峻雷インパルス電圧（Ｖｆ＝３７５ｋＶ）を２０回印加したときの貫通率（貫通個数／供試数）から急峻波強度を調べた。ここで、実際のがいしの貫通率は非常に小さく、試験的にこれを検証するため、絶縁距離を短くし貫通率が約１０倍となるような試験用がいしを本発明の磁器がいしとして使用した。結果を図３に示す。また、基準として、磁器がいし本体１の表面に釉薬層のみを設けた従来技術で製作した磁器がいしであって、上述した本発明の試験がいしと同様に絶縁距離を短くし貫通率が約１０倍になるような試験用がいしを準備し、上述した本発明の試験がいしと同様の試験を行ったところ、貫通率は３０％であった。図３の結果から、この貫通率３０％以下を満たすものは、第１のコーティング層の比誘電率が４．０以上であり、第１のコーティング層の比誘電率は４．０以上であることが、絶縁破壊強さの点で好ましいことがわかった。
【００１８】
【発明の効果】
以上の説明から明らかなように、本発明によれば、磁器がいし本体の表面に高誘電率結晶を含有する主として磁器質原料からなる第１のコーティング層を設けているため、釉薬と等価もしくはそれ以上の圧縮ストレスを磁器がいし本体に与えることができるほか、釉薬の欠点である気孔量を減少させ、機械的、電気的両面より素地の高い固有強度を発現させることができる。
【図面の簡単な説明】
【図１】本発明の磁器がいしの例として懸垂がいしの一例の構成を示す部分断面図である。
【図２】第１のコーティング層の見かけの比誘電率を求めるのに使用したモデルの一例を示す図である。
【図３】第１のコーティング層の比誘電率と製品の貫通率との関係を示すグラフである。
【符号の説明】
１ 磁器がいし本体、２ 第１のコーティング層、３ 第２のコーティング層、４ サンド、５ キャップ金具、６ ピン金具、７ セメント[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-voltage porcelain insulator, and more particularly to a high-voltage porcelain insulator excellent in mechanical strength and dielectric breakdown strength, that is, steep wave strength.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a porcelain insulator such as a solid insulator or a suspension insulator is known as a structural member that performs electrical insulation and mechanical support of an overhead power transmission line or the like. These porcelain insulators are made by mixing and molding raw materials such as alumina and clay to produce a molded body, applying a glaze to the surface of the produced molded body, and then firing the molded body coated with the glaze. ing. In order for porcelain to obtain the dielectric breakdown strength inherent to the base material of the insulator, it is necessary to make it solid, but by using a glaze, it fills in the micro-defects on the surface of the base material and the coefficient of thermal expansion with the base material By generating internal stress due to the difference, the porcelain exhibits the tensile strength of the insulator.
[0003]
[Problems to be solved by the invention]
These conventionally known porcelain insulators can sufficiently withstand use under normal voltage or a fouling atmosphere. However, when a higher voltage is applied, that is, when a steep lightning impulse voltage due to a natural lightning discharge is applied, these conventionally known porcelains are not sufficient, and the dielectric strength is drastically improved. There was a need to do.
[0004]
In addition, as a technique for improving the steep wave intensity characteristics, the present applicant has added a technique for adding a predetermined amount of MnO or the like to glaze (Japanese Patent Laid-Open No. 63-2111525), and a technique for defining the dielectric constant of sand and glaze in a suspension (Japanese Patent Laid-Open No. 9-63379), a technique for incorporating a corundum crystal in a porcelain (Japanese Patent Laid-Open No. 10-228818), etc., all of which have a structure in which a porcelain insulator is coated with glaze on the surface of the main body. Therefore, although the steep wave intensity is improved to some extent, a drastic improvement in the steep wave intensity cannot be achieved.
[0005]
Here, the glaze increases the blending ratio of feldspar among feldspar, alumina, and clay, which are raw materials for porcelain insulators, so that only a glass phase is generated. Therefore, the glaze should essentially have a high breakdown strength equivalent to that of glass, but its strength is lower than that of porcelain due to the presence of pores. Since the dielectric constant of the pores (air) is smaller than that of the surrounding glass phase, it is considered that the electric field concentrates on the pores when a potential is applied. Moreover, since the dielectric constant of the glaze is lower than the dielectric constant of the porcelain insulator body, for example, the glaze has been a weak point when a steep wave pulse is applied. For this reason, it has been found that it is difficult to drastically improve the structure of a conventional porcelain insulator in which a glaze is applied to the surface of a porcelain insulator body.
[0006]
Further, regarding the structure of the porcelain insulator, the present applicant, in Japanese Patent Application Laid-Open No. 7-262854, applies a glaze to the surface of the porcelain insulator body and provides a coating layer having a higher dielectric breakdown strength than the glaze on the glaze. The technology is disclosed. However, even in this example, since the glaze with pores is used on the surface of the porcelain insulator body, the problem of the glaze cannot be solved.
[0007]
An object of the present invention is to solve the above-mentioned problems and to provide a high-voltage porcelain insulator having improved dielectric breakdown strength, that is, steep wave strength, without lowering mechanical strength.
[0008]
[Means for Solving the Problems]
The high-voltage porcelain insulator of the present invention includes a porcelain insulator body, a first coating layer mainly made of a porcelain material containing a high dielectric constant crystal provided on the surface of the porcelain insulator body, and a surface of the first coating layer. And a second coating layer made of a glaze provided in the above.
[0009]
In the present invention, by providing the first coating layer mainly made of porcelain material containing a high dielectric constant crystal on the surface of the porcelain insulator body, the porcelain insulator body can be given compressive stress equivalent to or higher than glaze. In addition, the amount of pores, which is a drawback of glazes, can be reduced, and a higher intrinsic strength can be achieved than in both mechanical and electrical aspects. The first coating layer preferably includes a high dielectric constant crystal having a relative dielectric constant of 10 or more, which is made of titanium oxide and / or titanate compound. As a result, the apparent relative dielectric constant of the first coating layer can be preferably 4 or more, the difference in dielectric constant between the first coating layer and the porcelain insulator body can be reduced, and the first coating layer has a steep wave pulse. Does not become a weak point when applied. Furthermore, by making the porosity of the first coating layer smaller than the porosity of the second coating layer, this is preferable because the first coating layer does not become a weak point when applying a steep wave pulse.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a partial sectional view showing the structure of an example of a suspended insulator as an example of a porcelain insulator according to the present invention. In the example shown in FIG. 1, 1 is a suspended body made of porcelain, 2 is a first coating layer mainly made of a porcelain material containing a high dielectric constant crystal provided on the surface of the porcelain insulator body 1, and 3 is a first coating layer. The second coating layer made of glaze provided on the surface of the coating layer 2, 4 is an irregular sand adhered to the second coating layer 3, 5 is a cap metal fitting, 6 is a pin metal fitting, 7 is a cap metal fitting 5 And cement between the pin fitting 6 and the sand 4. In the structure of the suspension insulator shown in FIG. 1, a feature of the present invention is that a predetermined first coating layer 2 is provided on the surface of the suspension suspension body 1.
[0011]
The raw material for the first coating layer 2 is mainly a porcelain raw material, preferably, SiO 2 : 50-60 wt%, Ai 2 O 3 : 20-30 wt%, and other raw materials composed of MgO, CaO, K 2 O + Na 2 O. Is used. This porcelain raw material is clearly different in the amount of SiO 2 and Al 2 O 3 added as compared with a raw material conventionally known as a glaze. The high dielectric constant crystal added to the porcelain raw material is preferably a crystal having a relative dielectric constant of 10 or more at 1 MHz, more preferably a titanium oxide and / or titanate compound (MgTiO 3 , CaTiO 3 , BaTiO 3) . 3 , crystals made of MgO.Al 2 O 3 .3TiO 2 ) are used. The relative dielectric constant of the entire first coating layer 2 is preferably 4 or more. These configurations contribute to the improvement of steep wave intensity. Further, the thickness of the first coating layer 2 is not particularly limited, but is preferably 0.1 mm or more from the viewpoint of improving the steep wave characteristics. Furthermore, the difference in coefficient of thermal expansion between the first coating layer 2 and the suspended body 1 is not particularly limited, but 0.1 to 0.2% at 650 ° C. is preferable because the mechanical strength is improved. .
[0012]
A conventionally known glaze is used as the second coating layer 3. An example of a glaze, SiO 2: 60~70wt%, Al 2 O 3: 10~20wt%, preferably for removing glaze bubbles MnO: is 1 wt% or more of the composition and the like. Further, the porosity is not particularly limited, but the porosity may be higher than the porosity of the first coating layer 2 so that the first coating layer 2 does not become a weak point when applying a steep wave pulse. preferable. Further, the thickness is not particularly limited, but when it exceeds 0.5 mm, pores are inherently contained in the glaze. Therefore, the thickness is preferably 0.5 mm or less from the viewpoint of improving the steep wave intensity. As in the example shown in FIG. 1, in the suspension insulator example, the second coating layer 3 is used to bond the sand 4 to the outer peripheral surface and the inner peripheral surface of the head of the main body 1 with the porcelain insulator.
[0013]
Similar to the conventional glazing method, the first coating layer 2 is formed on the porcelain insulator body 1 by dipping the raw material mainly composed of the same base material as that of the porcelain insulator body 1 in a mud state. . Therefore, the porosity of the 1st coating layer 2 becomes higher than the porosity of the base material extruded with the vacuum kneader . For this reason, it is inevitable that the dielectric breakdown strength of the first coating layer 2 is lower than that of the substrate. As a result, the porosity should be reduced as much as possible to compensate for this. In addition, since the dielectric breakdown strength of the base constituting the porcelain insulator body 1 is at a considerably high level, considering the composite layer of the base and the first coating layer 2, the share ratio on the base side is increased and the first It is necessary to relax the electric field applied to the coating layer 2 as much as possible. For this reason, the first coating layer 2 is required to have a high dielectric constant.
[0014]
On the other hand, in order to increase the dielectric constant, in the present invention, the first coating layer 2 preferably contains a high dielectric constant crystal having a relative dielectric constant of 10 or more. As such a high dielectric constant crystal, a crystal phase of titanium oxide (relative dielectric constant: ε = 100), a crystal phase obtained by firing a titanic acid compound (MgO.Al 2 O 3 .3TiO 2, relative dielectric constant: ε = 20 ~ 100).
[0015]
Here, the measurement of the dielectric constant and other electrical properties in question is analyzed. Conventionally, the dielectric constant of glaze has been measured by processing a sample piece formed by pouring into a predetermined dimension. In the present invention, when the dielectric constant of the first coating layer 2 is measured according to this method, the relative dielectric constant often shows an unrealistic value. In practice, the porcelain is applied to the pinhole of the insulator body 1. In addition, it has been found that it is difficult to grasp the properties of the first coating layer 2. Therefore, in order to obtain the dielectric constant of the first coating layer 2 coated on the sample piece, the following method was used.
[0016]
First, based on the model in which the coating layer is formed on the surface of the substrate shown in FIG. 2, the capacitance (C 1 ) of the first coating layer 2 is equal to the capacitance (C) of the substrate / coating composite layer and the substrate. The capacitance (C 2 ) is individually measured and calculated from the following equation (1). If C 1 is obtained, the dielectric constant of the first coating layer 2 is obtained by the following equation (2). In this example, the thickness of the substrate was made as thin as possible and the value of C 2 was increased, thereby increasing the difference from the value of C and increasing the measurement accuracy of the dielectric constant of the first coating layer 2. Specifically, the substrate thickness was 1 mm, and the C 2 value was 61.5 pF.
[Expression 1]
Figure 0004094162
[0017]
Actually, the porcelain insulator of the present invention in which the first coating layer and the second coating layer are formed on the surface of the porcelain insulator body 1 is prepared, and a porcelain insulator having a changed dielectric constant of the first coating layer is prepared. The steep wave intensity was examined from the penetration rate (number of penetrations / number of samples) when 20 times of steep lightning impulse voltage (Vf = 375 kV) having a degree of 2500 kV / μs was applied. Here, the penetration rate of the actual insulator is very small, and in order to verify this experimentally, a test insulator with a short insulation distance and a penetration rate of about 10 times was used as the porcelain insulator of the present invention. . The results are shown in FIG. In addition, as a reference, a porcelain insulator manufactured by a conventional technique in which only a glaze layer is provided on the surface of the porcelain insulator body 1 is used, and the insulation distance is shortened and the penetration rate is about 10 times as in the above-described test insulator of the present invention. When a test insulator was prepared and the same test as the test insulator of the present invention described above was performed, the penetration rate was 30%. From the results shown in FIG. 3, those satisfying the penetration rate of 30% or less have a relative dielectric constant of the first coating layer of 4.0 or more, and the relative dielectric constant of the first coating layer is 4.0 or more. It was found that this is preferable in terms of dielectric breakdown strength.
[0018]
【The invention's effect】
As is clear from the above description, according to the present invention, the first coating layer mainly made of porcelain material containing a high dielectric constant crystal is provided on the surface of the porcelain insulator body. In addition to applying the above compressive stress to the porcelain insulator body, it is possible to reduce the amount of pores, which is a drawback of glazes, and to exhibit a higher intrinsic strength than mechanical and electrical surfaces.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing the configuration of an example of a suspended insulator as an example of a porcelain insulator according to the present invention.
FIG. 2 is a diagram showing an example of a model used for obtaining an apparent relative dielectric constant of a first coating layer.
FIG. 3 is a graph showing the relationship between the relative dielectric constant of the first coating layer and the product penetration rate.
[Explanation of symbols]
1 Porcelain insulator body 2 First coating layer 3 Second coating layer 4 Sand 5 Cap fitting 6 Pin fitting 7 Cement

Claims (3)

磁器がいし本体と、磁器がいし本体の表面に設けた高誘電率結晶を含有する主として磁器質原料からなる第１のコーティング層と、第１のコーティング層の表面に設けた釉薬からなる第２のコーティング層とからなることを特徴とする高電圧用磁器がいし。A porcelain insulator body, a first coating layer mainly composed of a porcelain raw material containing a high dielectric constant crystal provided on the surface of the porcelain insulator body, and a second coating comprising a glaze provided on the surface of the first coating layer A high-voltage porcelain insulator characterized by comprising layers. 前記高誘電率結晶が、酸化チタンおよび／またはチタン酸化合物である請求項１記載の高電圧用磁器がいし。The high-voltage ceramic insulator according to claim 1, wherein the high dielectric constant crystal is titanium oxide and / or titanate compound. 前記第１のコーティング層の気孔率が、前記第２のコーティング層の気孔率よりも小さい請求項１記載の高電圧用磁器がいし。The high-voltage porcelain insulator according to claim 1, wherein the porosity of the first coating layer is smaller than the porosity of the second coating layer.
JP06822199A 1999-03-15 1999-03-15 High voltage porcelain insulator Expired - Lifetime JP4094162B2 (en)

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CN 00117875 CN1199200C (en) 1999-03-15 2000-03-15 Ceramic insulator for high voltage

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