JPH0541527Y2 - - Google Patents

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Publication number
JPH0541527Y2
JPH0541527Y2 JP15950087U JP15950087U JPH0541527Y2 JP H0541527 Y2 JPH0541527 Y2 JP H0541527Y2 JP 15950087 U JP15950087 U JP 15950087U JP 15950087 U JP15950087 U JP 15950087U JP H0541527 Y2 JPH0541527 Y2 JP H0541527Y2
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JP
Japan
Prior art keywords
varistor element
varistor
electrode plate
hollow part
lightning arrester
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.)
Expired - Lifetime
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JP15950087U
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Japanese (ja)
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JPH0163102U (en
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Priority to JP15950087U priority Critical patent/JPH0541527Y2/ja
Publication of JPH0163102U publication Critical patent/JPH0163102U/ja
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Thermistors And Varistors (AREA)

Description

【考案の詳細な説明】 産業上の利用分野 本考案は雷サージを始めとする異常電圧から電
力設備を保護するための油中で適用される避雷器
に関するものである。
[Detailed Description of the Invention] Industrial Application Field The present invention relates to a lightning arrester that is applied in oil to protect power equipment from abnormal voltages such as lightning surges.

従来の技術 近年、電力分野において、電力の安定供給の要
望が以前にも増して高まり、電力設備機器の高信
頼化ならびに電力の高品質化が進められている。
特に、電力の高品質化は、送配電線上に雷などに
よつて発生する有害な異常電圧を確実に吸収、抑
制するために、通常ギヤツプをもたない酸化亜鉛
系の避雷器も実用化され、送配電設備の各所に取
付けられている。特に、この中で保護性能を向上
させた電力機器内蔵形の避雷器の実用化は急速に
進みつつある。これらギヤツプをもたない避雷器
の内部には特性要素として酸化亜鉛を主原料とす
るバリスタ素子が内蔵され、このバリスタ素子そ
のものの特性が避雷器の特性となる。このような
観点から、バリスタ素子のサージ吸収特性ならび
にバリスタ素子の特性が発揮できる避雷器のハウ
ジングは重要である。
BACKGROUND ART In recent years, in the electric power field, the demand for a stable supply of electric power has increased more than ever before, and efforts have been made to improve the reliability of electric power equipment and the quality of electric power.
In particular, with the aim of improving the quality of electricity, zinc oxide-based lightning arresters, which usually do not have a gap, have been put into practical use in order to reliably absorb and suppress harmful abnormal voltages generated by lightning on power transmission and distribution lines. They are installed at various locations in power transmission and distribution equipment. In particular, the practical use of lightning arresters built into power equipment with improved protection performance is rapidly progressing. A varistor element whose main raw material is zinc oxide is built inside these lightning arresters without a gap as a characteristic element, and the characteristics of this varistor element itself become the characteristics of the lightning arrester. From this point of view, it is important to have a lightning arrester housing that can exhibit the surge absorption characteristics of the varistor element as well as the characteristics of the varistor element.

従来、この種の避雷器の内部構造は、第2図,
第3図に示すような構成であつた。第2図は電力
機器内蔵形の代表的なもので、配電用油入変圧器
の油中で適用される避雷器の断面を示したもの
で、変圧器への取付け状態などは省略している。
第2図において、1は酸化亜鉛を主原料とし、ビ
スマス、プラセオジウムなどの添加物を加えて高
温焼結して得られたシリンダ状に中空部を有した
円柱形のバリスタ素子で、その内、外両側面には
絶縁層が設けられ、またその両端面にはアルミニ
ウムメタリコンで電極がそれぞれ形成されている
(共に図示せず)第2図では4個のバリスタ素子
が直列に接続された状態を示しているが、このよ
うなバリスタ素子が避雷器の適用定格に合わせて
必要な数が直列に組み込まれる。2は直列接続さ
れたバリスタ素子1の中空部を貫き、バリスタ素
子1ならびに避雷器全体を固定する絶縁棒で、通
常ガラス入りエポキシとなが用いられる。3は充
電端子で、積み重ねられた最上部のバリスタ素子
1の端面の電極に圧接されると同時に、その一端
は配電線(図示せず)の一線に接続される。4は
接地端子で最下部のバリスタ素子1の端面の電極
に圧接されると同時に、その一端は機器(図示せ
ず)のアースに接続され、避雷器全体の取付け金
具の役割ももつている。そして、これら充電端子
3、接地端子4は共に良導体の銅合金などで作ら
れている。5は充電端子3の上部に設けられた圧
接に必要な圧接力を与えるコイル状のスプリン
グ、6はスプリング5の一端のストツパー、7は
同様にストツパー6を固定し、圧接力を調整する
ためのナツトで、絶縁棒2の端部に設けられたオ
ネジに締付けられることで固定されている。8は
ナツト7と同様な働きをもつナツトで、接地端子
4の下部に取付けられている。9は接地端子4と
ナツト8の間に挾み込まれた電極板で、バリスタ
素子1の中空部に通じる通油孔を有している。
Conventionally, the internal structure of this type of lightning arrester is shown in Figure 2.
The configuration was as shown in Figure 3. Figure 2 is a typical type of built-in power equipment, and shows a cross section of a lightning arrester that is applied in oil in an oil-immersed power distribution transformer, and does not show how it is installed on the transformer.
In Fig. 2, numeral 1 is a cylindrical varistor element having a cylindrical hollow part, which is obtained by sintering zinc oxide as the main raw material and adding additives such as bismuth and praseodymium at high temperature. An insulating layer is provided on both outer sides, and electrodes are formed on both end faces of aluminum metallicon (both not shown). Figure 2 shows a state in which four varistor elements are connected in series. As shown, the required number of such varistor elements are installed in series according to the applicable rating of the lightning arrester. Reference numeral 2 denotes an insulating rod which penetrates the hollow part of the varistor elements 1 connected in series and fixes the varistor elements 1 and the entire lightning arrester, and is usually made of glass-filled epoxy. Reference numeral 3 denotes a charging terminal, which is pressed into contact with the electrode on the end surface of the uppermost stacked varistor element 1, and at the same time, one end thereof is connected to a line of a power distribution line (not shown). 4 is a grounding terminal which is press-contacted to the electrode on the end face of the lowermost varistor element 1, and at the same time, one end thereof is connected to the ground of equipment (not shown), and also serves as a mounting bracket for the entire lightning arrester. The charging terminal 3 and the grounding terminal 4 are both made of a good conductor, such as a copper alloy. Reference numeral 5 denotes a coiled spring provided on the top of the charging terminal 3 to provide the pressure contact force necessary for pressure contact, 6 a stopper at one end of the spring 5, and 7 similarly fixing the stopper 6 and for adjusting the pressure contact force. It is fixed by tightening a nut to a male screw provided at the end of the insulating rod 2. A nut 8 has the same function as the nut 7, and is attached to the lower part of the ground terminal 4. Reference numeral 9 denotes an electrode plate inserted between the ground terminal 4 and the nut 8, and has an oil hole communicating with the hollow part of the varistor element 1.

第2図に示した避雷器は変圧器の絶縁油中にて
適用され、絶縁油は避雷器の外側を始め、バリス
タ素子1の中空部にも流れる。第3図は第2図に
示したイ〜ロ部の平面の断面を示したもので、バ
リスタ素子1の中空部と絶縁棒2の隙間が絶縁油
の通油路となる。
The arrester shown in FIG. 2 is applied in the insulating oil of the transformer, and the insulating oil flows not only outside the arrester but also into the hollow part of the varistor element 1. FIG. 3 shows a plane cross section of parts A to B shown in FIG. 2, and the gap between the hollow part of the varistor element 1 and the insulating rod 2 becomes an oil passage for insulating oil.

以上のように構成された従来の避雷器のサージ
電流吸収時の挙動について、以下その動作を説明
する。
The behavior of the conventional lightning arrester configured as described above when absorbing a surge current will be described below.

まず、雷サージ電圧が避雷器の充電端子3と接
地端子4の両端に印加された場合、それらの電圧
に伴うサージ電流が避雷器に流れ、避雷器両端の
電圧が抑制される。この時、サージ電流は直列接
続されたバリスタ素子1を通過することになり、
その時の消費エネルギーはジユール熱となつて、
一旦バリスタ素子1の温度を上昇させ、その後、
バリスタ素子1の外側面ならびに内側面から絶縁
油へ放熱が行われる。
First, when a lightning surge voltage is applied across the charging terminal 3 and the grounding terminal 4 of a lightning arrester, a surge current accompanying those voltages flows through the lightning arrester, suppressing the voltage across the lightning arrester. At this time, the surge current passes through the series-connected varistor element 1,
The energy consumed at that time becomes Joule heat,
Once the temperature of the varistor element 1 is raised, then
Heat is radiated from the outer and inner surfaces of the varistor element 1 to the insulating oil.

考案が解決しようとする問題点 しかしながら、このような従来の構成では、絶
縁棒とバリスタ素子の中空部との間に隙間がある
ため、避雷器の組立て時あるいは機械的な外方に
よつて、バリスタ素子が互いに位置ズレを生じる
恐れがあり、そのズレによつて避雷器としての放
電耐量が低下する問題があつた。
Problems to be Solved by the Invention However, in such a conventional configuration, there is a gap between the insulating rod and the hollow part of the varistor element. There is a risk that the elements may be misaligned with each other, and this misalignment poses a problem in that the discharge withstand capacity of the lightning arrester is reduced.

本考案は、このような問題点を解決しようとす
るもので、組立て時においてもあるいは機械的外
力によつてもバリスタ素子の位置ズレを生じず、
またバリスタ素子中空部の通油特性も維持しよう
とするものである。
The present invention aims to solve these problems, and is designed to prevent the varistor element from shifting during assembly or due to external mechanical force.
It is also intended to maintain the oil permeability of the hollow portion of the varistor element.

問題点を解決するための手段 本考案は前記問題点を解決するために、バリス
タ素子間に、中央部にバリスタ素子の中空部内径
よりもわずかに小さな径の孔をもち、孔の内周部
に前記バリスタ素子が隣接する部分よりも厚く、
そのバリスタ素子の位置ズレを防止する厚み段差
を設けた中間電極板を挾み込み、それぞれの中空
部、孔に絶縁棒を通して構成したものである。
Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a hole in the center between the varistor elements with a diameter slightly smaller than the inner diameter of the hollow part of the varistor element. the varistor element is thicker than the adjacent portion;
It is constructed by inserting an intermediate electrode plate having a thickness step to prevent the varistor element from shifting, and inserting an insulating rod into each hollow part or hole.

作 用 本考案は前記した構成により、中間電極板の孔
の縁に厚み段差を設けているため、この段差によ
りバリスタ素子の組立て時あるいは機械的外力が
加わつた時にも、バリスタ素子の位置ズレは生じ
ない。また、絶縁棒の外径と、中間電極板の孔の
内径との間には十分な直径差を設けているため、
通油特性は従来と変わらない特性をもつものであ
る。
Effects Because the present invention has the above-described configuration, a thickness step is provided at the edge of the hole in the intermediate electrode plate, so this step prevents the varistor element from shifting when assembled or when an external mechanical force is applied. Does not occur. In addition, since there is a sufficient difference in diameter between the outer diameter of the insulating rod and the inner diameter of the hole in the intermediate electrode plate,
The oil permeability properties are the same as conventional ones.

実施例 第1図は本考案の避雷器の一実施例を示し、同
図は配電用油入変圧器の油中で適用される避雷器
の断面を示したものである。第1図において、1
0は酸化亜鉛を主原料とするバリスタ素子、11
は充電端子、12は接地端子、13はスプリン
グ、14はストツパー、15および16はそれぞ
れナツト、17は電極板、18は絶縁棒で、これ
らはそれぞれ従来のバリスタ素子1、充電端子
3、接地端子4、スプリング5、ストツパー6、
ナツト7,8、電極板9、絶縁棒2に対応するも
のである。19は本考案に係る中間電極板で、2
0はこの中間電極板19の中央12、バリスタ素
子10の中空部の内径よりもわずかに小さな径の
孔の周辺(縁)に設けられた厚み段差で、バリス
タ素子10が隣接する部分よりも厚くなつてい
る。この中間電極板19にはサージ電流が通過す
るため、電導特性に優れた銅合金あるいはアルミ
ニウなどが用いられる。また、中間電極板19
は、バリスタ素子10の隣接部にすべて用いら
れ、第1図では3枚用いられている。
Embodiment FIG. 1 shows an embodiment of the lightning arrester of the present invention, and the same figure shows a cross section of the lightning arrester applied in oil of an oil-immersed power distribution transformer. In Figure 1, 1
0 is a varistor element whose main material is zinc oxide, 11
is a charging terminal, 12 is a grounding terminal, 13 is a spring, 14 is a stopper, 15 and 16 are nuts, 17 is an electrode plate, and 18 is an insulating rod, which are the conventional varistor element 1, charging terminal 3, and grounding terminal, respectively. 4, spring 5, stopper 6,
This corresponds to the nuts 7 and 8, the electrode plate 9, and the insulating rod 2. 19 is an intermediate electrode plate according to the present invention;
0 is a thickness step provided at the center 12 of this intermediate electrode plate 19, around the periphery (edge) of a hole whose diameter is slightly smaller than the inner diameter of the hollow part of the varistor element 10, and where the varistor element 10 is thicker than the adjacent part. It's summery. Since a surge current passes through the intermediate electrode plate 19, a copper alloy, aluminum, or the like having excellent conductivity is used. In addition, the intermediate electrode plate 19
are used in the adjacent portions of the varistor element 10, and three pieces are used in FIG.

次に、以上のように構成された避雷器の動作を
説明する。従来例と同様に雷サージ電圧が避雷器
の充電端子11と接地端子12の両端に印加され
た場合、それらの電圧に伴うサージ電流が避雷器
に流れ、避雷器両端の電圧が抑制される。この
時、サージ電流は直列接続されたバリスタ素子1
0を通過することになり、その時の消費エネルギ
ーはジユール熱となつて、一旦バリスタ素子10
の温度を上昇させ、その後、バリスタ素子10の
外側面ならびに内側面と中間電極板19から絶縁
油へ放熱され、バリスタ素子10の中空部内の絶
縁油の外部との出入りによつて冷却が行われる。
Next, the operation of the lightning arrester configured as above will be explained. Similar to the conventional example, when a lightning surge voltage is applied across the charging terminal 11 and the grounding terminal 12 of the arrester, the surge current accompanying those voltages flows through the arrester, suppressing the voltage across the arrester. At this time, the surge current flows through the varistor element 1 connected in series.
0, the energy consumed at that time becomes Joule heat, and once the varistor element 10
After that, heat is radiated from the outer and inner surfaces of the varistor element 10 and the intermediate electrode plate 19 to the insulating oil, and cooling is performed by the insulating oil flowing in and out of the hollow part of the varistor element 10. .

このような形状をもつた中間電極板19を用い
ることによつて、バリスタ素子10の縦積み組立
て時の位置ズレ、さらに機械的外力による位置ズ
レも防止することができ、また厚み段差20の部
分における中間電極板19の内径と絶縁棒18の
直径間に十分な差を設けてあるため、従来と同様
な通油特性が得られる。
By using the intermediate electrode plate 19 having such a shape, it is possible to prevent misalignment of the varistor elements 10 when vertically stacking them, as well as misalignment due to external mechanical force. Since there is a sufficient difference between the inner diameter of the intermediate electrode plate 19 and the diameter of the insulating rod 18, the same oil permeability as in the prior art can be obtained.

なお、本考案の実施例ではスプリング13をコ
イル状としたが、サラバネ、スプリングワツシヤ
ーであつてもよい。この場合、電極板17を反対
側(上部側)にも使用すれば通油特性に支障はな
い。また、厚み段差20は必ずしも切れ目がない
形でリング状になつている必要はない。
In the embodiment of the present invention, the spring 13 has a coil shape, but it may also be a flat spring or a spring washer. In this case, if the electrode plate 17 is also used on the opposite side (upper side), the oil permeability will not be affected. Further, the thickness step 20 does not necessarily have to be continuous and ring-shaped.

考案の効果 以上のように本考案によれば、バリスタ素子間
に、中央部にバリスタ素子の中空部内径よりもわ
ずかに小さな径の孔をもち、その孔の内周部に厚
み段差を設けた中間電極を挾み込み、バリスタ素
子の中空部、中間電極板の孔に絶縁棒を通して油
中用避雷器を構成することにより、バリスタ素子
の縦積み組立て時の位置ズレを防止することがで
き、また機械的な外力による位置ズレも防止する
ことができ、バリスタ素子冷却のための通油特性
も維持するといつた効果をもつものである。
Effects of the invention As described above, according to the invention, a hole with a diameter slightly smaller than the inner diameter of the hollow part of the varistor element is provided in the center between the varistor elements, and a step in thickness is provided on the inner periphery of the hole. By inserting the intermediate electrode and passing an insulating rod through the hollow part of the varistor element and the hole in the intermediate electrode plate to form an oil-submerged lightning arrester, it is possible to prevent misalignment when assembling the varistor elements vertically. This has the advantage of being able to prevent positional displacement due to external mechanical forces, and also maintaining oil permeability for cooling the varistor element.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本考案の一実施例による避雷器を示す
断面図、第2図は従来の避雷器を示す断面図、第
3図は第2図のイ〜ロ部の平面断面図である。 10……バリスタ素子、11……充電端子、1
2……接地端子、13……スプリング、14……
ストツパー、15,16……ナツト、17……電
極板、18……絶縁棒、19……中間電極板、2
0……厚み段差。
FIG. 1 is a sectional view showing a lightning arrester according to an embodiment of the present invention, FIG. 2 is a sectional view showing a conventional lightning arrester, and FIG. 3 is a plan sectional view of parts A to B of FIG. 10... Varistor element, 11... Charging terminal, 1
2...Ground terminal, 13...Spring, 14...
Stopper, 15, 16... Nut, 17... Electrode plate, 18... Insulating rod, 19... Intermediate electrode plate, 2
0...Thickness step.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] シリンダ状に中空部を有し、両端面に電極をも
つた円柱状バリスタ素子を複数個積み重ねた前記
バリスタ素子間に、中央部に前記バリスタ素子の
中空部内径よりもわずかに小さな径の孔をもち、
前記孔の内周部に前記バリスタ素子が隣接する部
分よりも厚く、そのバリスタ素子の位置ズレを防
止する厚み段差を設けた中間電極板を挾み込み、
前記バリスタ素子、前記電極板のそれぞれ中空
部、孔に絶縁棒を通して構成されたことを特徴と
する避雷器。
A hole with a diameter slightly smaller than the inner diameter of the hollow part of the varistor element is formed in the center between the varistor elements, which are made by stacking a plurality of cylindrical varistor elements each having a cylindrical hollow part and electrodes on both end faces. rice cake,
An intermediate electrode plate is inserted into the inner peripheral part of the hole, which is thicker than the part adjacent to the varistor element and has a thickness step to prevent the varistor element from shifting;
A lightning arrester characterized in that an insulating rod is passed through a hollow part and a hole in each of the varistor element and the electrode plate.
JP15950087U 1987-10-19 1987-10-19 Expired - Lifetime JPH0541527Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15950087U JPH0541527Y2 (en) 1987-10-19 1987-10-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15950087U JPH0541527Y2 (en) 1987-10-19 1987-10-19

Publications (2)

Publication Number Publication Date
JPH0163102U JPH0163102U (en) 1989-04-24
JPH0541527Y2 true JPH0541527Y2 (en) 1993-10-20

Family

ID=31440767

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15950087U Expired - Lifetime JPH0541527Y2 (en) 1987-10-19 1987-10-19

Country Status (1)

Country Link
JP (1) JPH0541527Y2 (en)

Also Published As

Publication number Publication date
JPH0163102U (en) 1989-04-24

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