JPH06140209A - Lightning arrester - Google Patents
Lightning arresterInfo
- Publication number
- JPH06140209A JPH06140209A JP29099192A JP29099192A JPH06140209A JP H06140209 A JPH06140209 A JP H06140209A JP 29099192 A JP29099192 A JP 29099192A JP 29099192 A JP29099192 A JP 29099192A JP H06140209 A JPH06140209 A JP H06140209A
- Authority
- JP
- Japan
- Prior art keywords
- lightning arrester
- columns
- shield ring
- internal
- inner element
- 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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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は酸化亜鉛を主成分とする
非直線抵抗体を備えた、ガス絶縁開閉装置（以下ＧＩＳ
という）用の避雷器に関する。BACKGROUND OF THE INVENTION The present invention relates to a gas-insulated switchgear (hereinafter referred to as GIS) equipped with a non-linear resistor containing zinc oxide as a main component.
Said) for lightning arresters.
【０００２】[0002]
【従来の技術】一般に避雷器は筒状の接地容器内に酸化
亜鉛を主成分とする非直線抵抗体を積層した素子柱を内
部要素として収納し、ＳＦ6 ガスのような絶縁ガスを充
填して構成されている。このようなＧＩＳ用の避雷器に
あっては内部要素と接地容器間の浮遊静電容量が大き
く、多数の非直線抵抗体を直列接続した高電圧用の避雷
器の場合は特に内部要素の電圧分担が大幅に乱され、高
圧側に過大な電圧ストレスが印加されやすい。このため
寿命特性及び熱的安定性の良好な避雷器を得るには電圧
分担を均一にすることが必要である。電圧分担の均一化
を試みた避雷器として以下に示す２つのタイプの避雷器
が知られている。 （１）キャパシタンスによって電位制御した避雷器2. Description of the Related Art In general, a lightning arrester has a cylindrical grounded container in which an element column having a non-linear resistor containing zinc oxide as a main component is housed as an internal element and filled with an insulating gas such as SF 6 gas. It is configured. In such a lightning arrester for GIS, the floating electrostatic capacitance between the internal element and the ground container is large, and in the case of a high-voltage lightning arrester in which a large number of non-linear resistors are connected in series, the voltage sharing of the internal element is particularly great. It is greatly disturbed, and excessive voltage stress is likely to be applied to the high voltage side. For this reason, it is necessary to make the voltage sharing uniform in order to obtain a lightning arrester having good life characteristics and thermal stability. The following two types of lightning arresters are known as lightning arresters that have attempted to make the voltage sharing uniform. (1) Lightning arrester whose potential is controlled by capacitance
【０００３】内部容素全体をコンデンサ筒に収納した
り、あるいは内部要素と並列にセラミックコンデンサを
接続することにより避雷器の電位分布を改善したもので
ある。但し、これはキャパシタのコストが高いため、５
００ｋＶ用などの高定格避雷器を除いては余り経済的と
は言えない。 （２）シールドリングによって電位制御した避雷器The entire internal element is housed in a capacitor tube, or a ceramic capacitor is connected in parallel with internal elements to improve the potential distribution of the arrester. However, this is because the cost of the capacitor is high.
It is not very economical except for the high-rated lightning arrester for 00kV. (2) Lightning arrester with potential controlled by shield ring
【０００４】シールドリングを備えた避雷器は図６に示
すように、接地容器１の内部に内部要素２を収納し、こ
の内部要素２と略同軸状に絶縁筒３を配設し、内部要素
２の高圧側には円筒状のシールドリング４を配設して構
成されている。このような避雷器各部の電圧分担率を計
算および実験より求めると図４の特性Ｂとなる。すなわ
ちシールドリング４を全く用いなかった場合の特性Ａに
比べ、かなり電圧分担は均一化されているが、図示のよ
うにシールドリング４の下端部近傍に位置する内部要素
２に局部的に高い電圧ストレスが発生するため、非直線
抵抗体の課電寿命・熱的特性上、好ましくない。これを
改善するために、シールドリング４の直径を大地電位側
に近づくにつれて大きくした避雷器が知られているが
（特開昭60-62081号）、接地容器１が著しく大きくなっ
てしまうという問題がある。また、スキューシールド方
式などの特殊なシールドを採用した避雷器も知られてい
るが（実公昭63-44957号) 、電圧解析が困難なため設計
が難しく、シールドリングを用いた避雷器と同様に接地
容器が大形化するという問題があった。As shown in FIG. 6, a lightning arrester equipped with a shield ring accommodates an internal element 2 inside a grounded container 1 and an insulating cylinder 3 arranged substantially coaxially with the internal element 2 to form an internal element 2. A cylindrical shield ring 4 is arranged on the high pressure side of the. When the voltage sharing rate of each part of the arrester is obtained by calculation and experiment, the characteristic B in FIG. 4 is obtained. That is, compared with the characteristic A in the case where the shield ring 4 is not used at all, the voltage sharing is considerably equalized, but as shown in the figure, a high voltage is locally applied to the internal element 2 located near the lower end of the shield ring 4. Since stress is generated, it is not preferable in terms of the life of the non-linear resistor and the thermal characteristics. In order to improve this, there is known a lightning arrester in which the diameter of the shield ring 4 is increased toward the ground potential side (Japanese Patent Laid-Open No. 60-62081), but there is a problem that the ground container 1 becomes significantly large. is there. There are also known lightning arresters that employ a special shield such as the skew shield method (Act No. 63-44957), but it is difficult to design because voltage analysis is difficult, and the grounding container is similar to the lightning arrester that uses a shield ring. Had the problem of becoming larger.
【０００５】[0005]
【発明が解決しようとする課題】上述したように従来の
避雷器においては電圧分担が著しく不均一であり、電圧
分担を均一化しようとすると接地容器が大型化するとい
う問題があった。そこで本発明の目的は小型でしかも電
圧分担を改善した避雷器を提供することにある。As described above, in the conventional lightning arrester, the voltage sharing is remarkably non-uniform, and there is a problem that the grounding container becomes large in size in order to make the voltage sharing uniform. Therefore, an object of the present invention is to provide a lightning arrester that is small in size and has improved voltage sharing.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に本願発明においては、筒状接地容器内に、酸化亜鉛を
主成分とする非直線抵抗体を積層した素子柱を備えた内
部要素を収納し、この内部要素の高圧側に円筒状の金属
シールドを配設した避雷器において、前記内部要素が機
械的には複数の前記素子柱を多柱構造に配設してなり、
電気的には前記金属シールドの下端部近傍で前記素子柱
を互いに並列接続してなり、前記下端部近傍以外では前
記素子柱を互いに直列接続してなることを特徴とする避
雷器を提供する。In order to achieve the above object, according to the present invention, an internal element having an element column in which a non-linear resistor containing zinc oxide as a main component is laminated is provided in a cylindrical grounding container. In a lightning arrester in which a cylindrical metal shield is disposed on the high pressure side of the internal element, the internal element mechanically arranges a plurality of the element columns in a multi-column structure,
Electrically provided is a lightning arrester characterized in that the element columns are connected in parallel with each other near the lower end of the metal shield, and the element columns are connected in series with each other except near the lower end.
【０００７】[0007]
【作用】接地容器内に収納される内部要素は機械的には
複数の素子柱を多柱構造に配置しているため、同数の非
直線抵抗体を一柱に積層した場合に比べて避雷器の高さ
を低く抑えることができる。また素子柱は金属シールド
の下端部近傍では電気的に並列接続されており、下端部
近傍以外では直列接続されているので、高い電位ストレ
スが印加される金属シールドの下端部近傍と、それ以外
の部分での内部要素の静電容量を変えることができ、電
位分布を均一に近づけることができる。[Function] Since the internal elements housed in the grounding container are mechanically arranged with a plurality of element columns in a multi-column structure, compared to the case where the same number of non-linear resistors are laminated in one column, The height can be kept low. Further, since the element columns are electrically connected in parallel near the lower end of the metal shield and are connected in series except near the lower end, the element pillar is not connected to the vicinity of the lower end of the metal shield to which high potential stress is applied. It is possible to change the capacitance of the internal element in the part, and to bring the potential distribution close to uniform.
【０００８】[0008]
【実施例】以下に本発明の一実施例を図１乃至図４を参
照して説明する。なお従来と同一の部分には同じ番号を
付与し説明を省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. It should be noted that the same numbers are given to the same parts as the conventional ones, and the description thereof will be omitted.
【０００９】図１に示すようにＳＦ6 ガスを充填した筒
状の接地容器１内に、酸化亜鉛を主成分とする非直線抵
抗体を積層した素子柱を備えた内部要素２を収納し、さ
らにこの内部要素２の周囲に絶縁筒３を配設する。内部
要素２の高圧側には内部要素２と略同軸状に円筒状のシ
ールドリング４を配設する。このシールドリング４は金
属製であり、シールドリング４全体は内部要素２の高圧
側の電位に保たれている。シールドリング４の直径は、
避雷器の放電時にシールドリング４と内部要素２間でフ
ラッシオーバが起こらない直径とし、軸方向の長さは内
部要素２の全高の20乃至40％程度の長さとする。As shown in FIG. 1, a tubular grounding container 1 filled with SF 6 gas accommodates an internal element 2 having an element column in which a non-linear resistor containing zinc oxide as a main component is laminated. Further, an insulating cylinder 3 is arranged around the inner element 2. On the high pressure side of the inner element 2, a cylindrical shield ring 4 is arranged substantially coaxially with the inner element 2. The shield ring 4 is made of metal, and the entire shield ring 4 is kept at the potential on the high voltage side of the internal element 2. The diameter of the shield ring 4 is
The diameter is set so that no flashover occurs between the shield ring 4 and the inner element 2 when the lightning arrester is discharged, and the axial length is about 20 to 40% of the total height of the inner element 2.
【００１０】内部要素２は図２に示すように機械的には
非直線抵抗体２ｘを積層した素子柱を例えば３柱並置し
た、３柱構造で構成されている。内部要素２は、シール
ドリング４の下端部近傍以外の内部要素２ａとシールド
リング４の下端部近傍の内部要素２ｂを、高圧側から、
内部要素２ａ、絶縁板２ｙ、内部要素２ｂ、絶縁板２
ｙ、内部要素２ａの順に積層して構成されている。夫々
の絶縁板２ｙには並置された３柱の素子柱のうち１柱の
素子柱で内部要素２ａ，２ｂを互いに接続するための孔
が形成されており、導体によって内部要素２ａ，２ｂの
電気的接続が保たれている。内部要素２ａにおいては所
定間隔ごとに絶縁板２ｙが配置され、接続板２ｚによっ
て３柱の素子柱が、ジグザク状に互いに直列接続されて
いる。一方内部要素２ｂにおいては、３柱の素子柱は電
気的に並列接続されている。内部要素２ｂを構成する素
子柱の長さは内部要素２全体の例えば５〜20％程度とす
る。次に図３を参照して作用について説明する。As shown in FIG. 2, the internal element 2 mechanically has a three-column structure in which, for example, three element columns in which the non-linear resistors 2x are laminated are arranged side by side. The inner element 2 includes an inner element 2a other than near the lower end of the shield ring 4 and an inner element 2b near the lower end of the shield ring 4 from the high pressure side.
Inner element 2a, insulating plate 2y, inner element 2b, insulating plate 2
y and the internal element 2a are laminated in this order. In each insulating plate 2y, a hole for connecting the internal elements 2a and 2b to each other is formed by one of the three element columns arranged side by side, and the conductors of the internal elements 2a and 2b are electrically connected. The physical connection is maintained. In the internal element 2a, insulating plates 2y are arranged at predetermined intervals, and three element columns are connected in series in a zigzag manner by a connecting plate 2z. On the other hand, in the internal element 2b, the three element columns are electrically connected in parallel. The length of the element column forming the inner element 2b is, for example, about 5 to 20% of the whole inner element 2. Next, the operation will be described with reference to FIG.
【００１１】図３は本実施例の避雷器の電気的等価回路
図を示している。シールドリング４の下端部近傍よりも
高圧側の内部要素２ａの静電容量ＣA1は、非直線抵抗体
２ｘの静電容量Ｃx と、内部要素２ａとシールドリング
４の間の浮遊静電容量ＣS のコンデンサのはしご形回路
の静電容量に相当する。また静電容量ＣB はシールドリ
ング４の下端部近傍の内部要素２ｂの静電容量に相当
し、静電容量ＣB のコンデンサよりも低圧側のコンデン
サの静電容量ＣA2は、非直線抵抗体２ｘの静電容量ＣX
と、内部要素２ａと接地との間の浮遊静電容量Ｃe のは
しご形回路によって決定される。静電容量ＣB は静電容
量ＣA1，ＣA2よりも大きい値となる。FIG. 3 shows an electrical equivalent circuit diagram of the lightning arrester of this embodiment. The electrostatic capacitance C A1 of the internal element 2a on the higher voltage side than the vicinity of the lower end of the shield ring 4 is the electrostatic capacitance C x of the nonlinear resistor 2x and the floating electrostatic capacitance between the internal element 2a and the shield ring 4. It corresponds to the capacitance of the ladder circuit of the capacitor of C S. Further, the capacitance C B corresponds to the capacitance of the internal element 2b near the lower end of the shield ring 4, and the capacitance C A2 of the capacitor on the lower voltage side than the capacitor of the capacitance C B is a non-linear resistance. Capacitance C X of body 2x
And a stray capacitance C e between the internal element 2a and ground is determined by the ladder circuit. The electrostatic capacitance C B has a larger value than the electrostatic capacitances C A1 and C A2 .
【００１２】この電気的等価回路を用いて内部要素２の
電圧分担率を計算により求めると図４に示す結果が得ら
れる。前述したように、図４の特性Ａはシールドリング
を用いていない場合を示し、特性Ｂはすべての内部要素
が内部要素２ａの構造を有する従来例の特性である。特
性Ｂにおいてはシールドリングの下端部近傍で電圧分担
率の大きなピークが現われ、この位置の内部要素に電圧
ストレスが集中していることが示されている。特性Ｃは
本実施例の避雷器の特性を示しており、シールドリング
下端部近傍で電圧分担率の変動が現われるものの、変動
のピーク高は低くなり電圧ストレスが緩和されているの
がわかる。When the voltage sharing ratio of the internal element 2 is calculated by using this electrically equivalent circuit, the result shown in FIG. 4 is obtained. As described above, the characteristic A of FIG. 4 shows the case where the shield ring is not used, and the characteristic B is the characteristic of the conventional example in which all the internal elements have the structure of the internal element 2a. In the characteristic B, a large peak of the voltage sharing ratio appears near the lower end of the shield ring, and it is shown that the voltage stress is concentrated on the internal element at this position. Characteristic C shows the characteristic of the lightning arrester of this embodiment. It can be seen that although the voltage sharing ratio varies near the lower end of the shield ring, the peak height of the variation is low and the voltage stress is alleviated.
【００１３】このように電界ストレスが緩和されるのは
素子柱間を並列接続した内部要素２ｂの静電容量ＣB が
素子柱間を直列接続した内部要素２ａの静電容量ＣA1，
ＣA2よりも大きくなり、インピーダンスが小さくなるこ
とによる。非直線抵抗体の断面積にほぼ比例して非直線
抵抗体の静電容量は増加するので、非直線抵抗体の直径
と並列数を適宜選択することにより、さらに適した条件
を見出すことが可能である。このように非直線抵抗体の
直径は内部要素２ａ，２ｂで変えることが可能であり、
また素子柱の本数を内部要素２ａ，２ｂで変えてもよ
い。最大電圧分担率は接地容器１の径、シールドリング
４の径と深さ及び内部要素２ａ，２ｂの構成等によって
決定されるので、解析によって最大電圧分担率を最小限
に抑えるための内部要素２ｂの構成を決定することがで
きる。次に本発明の他の実施例を図４及び図５を参照し
て説明する。In this way, the electric field stress is relieved because the capacitance C B of the internal element 2b in which the element columns are connected in parallel is the capacitance C A1 of the internal element 2a in which the element columns are connected in series,
This is because it becomes larger than C A2 and the impedance becomes smaller. Since the capacitance of the non-linear resistor increases almost in proportion to the cross-sectional area of the non-linear resistor, it is possible to find more suitable conditions by selecting the diameter of the non-linear resistor and the number of parallel connections. Is. Thus, the diameter of the non-linear resistor can be changed by the internal elements 2a and 2b,
Further, the number of element columns may be changed between the internal elements 2a and 2b. Since the maximum voltage sharing rate is determined by the diameter of the grounding container 1, the diameter and depth of the shield ring 4, the configuration of the internal elements 2a, 2b, etc., the internal element 2b for minimizing the maximum voltage sharing rate is analyzed. Can be determined. Next, another embodiment of the present invention will be described with reference to FIGS.
【００１４】なお図１と同じ構成要素には同一の番号を
付し説明を省略する。本実施例は図５に示すように内部
要素２ｂの低圧側に、内部要素２ｂよりも並列接続され
た非直線抵抗体数が少ない内部要素２Ｃが接続され、内
部要素２全体は、高圧側から順に内部要素２ａ，２ｂ，
２ｃ，２ａが接続されて構成されている。内部要素２
ａ，２ｂ，２ｃ，２ａの静電容量ＣＡ１，ＣB ，ＣC ，
ＣA2を比較すると、ＣB が最大であり、ＣB についでＣ
C 、ＣC についでＣA1，ＣA2という大小関係が成立して
いる。The same components as those shown in FIG. 1 are designated by the same reference numerals and their explanations are omitted. In this embodiment, as shown in FIG. 5, an internal element 2C having a smaller number of non-linear resistors connected in parallel than the internal element 2b is connected to the low voltage side of the internal element 2b. The internal elements 2a, 2b,
2c and 2a are connected to each other. Internal element 2
a, 2b, 2c, 2a capacitance C A1 , C B , C C ,
Comparing C A2 , C B is the largest, and C B is followed by C
The magnitude relationship of C A1 and C A2 is established after C and C C.
【００１５】図４に示すように本実施例の避雷器の電圧
分担の特性Ｄは、特性Ｃよりもさらにシールドリング下
端部近傍での電圧分担率の変動が小さくなり、電界スト
レスが緩和されていることを示している。As shown in FIG. 4, in the voltage sharing characteristic D of the lightning arrester of this embodiment, the fluctuation of the voltage sharing rate near the lower end of the shield ring is smaller than that of the characteristic C, and the electric field stress is alleviated. It is shown that.
【００１６】これら２つの実施例によれば素子柱の接続
をシールドリングの下端部近傍では並列接続、下端部近
傍以外では直列接続して内部要素を構成したため、接地
容器を大型化することなく内部要素の電圧分担を均一化
することができる。電圧分担の均一化に伴い課電寿命特
性や熱的安定性が向上する。また特殊なシールドを使う
必要がないため解析、計算が容易であり設計時の作業性
が向上する。さらに高価なコンデンサ筒やセラミックコ
ンデンサを使用せずにすむため安価な避雷器を提供する
ことができる。According to these two embodiments, the element pillars are connected in parallel near the lower end of the shield ring and connected in series except near the lower end to form the internal elements. The voltage sharing of the elements can be made uniform. Along with uniform voltage sharing, the life characteristics and thermal stability of electric charge are improved. Moreover, since it is not necessary to use a special shield, analysis and calculation are easy and workability at the time of design is improved. Furthermore, since it is not necessary to use an expensive condenser cylinder or a ceramic condenser, an inexpensive lightning arrester can be provided.
【００１７】[0017]
【発明の効果】以上述べたように本発明においては、内
部要素を機械的には素子柱を多柱構造に配設し、電気的
にはシールドリングの下端部近傍で素子柱を互いに並列
接続し、下端部近傍以外で素子柱を互いに直列接続する
ことによって接地容器を大型化せずに電圧分担を均一化
した避雷器を提供することができる。As described above, in the present invention, the internal elements are mechanically arranged in a multi-column structure, and the element columns are electrically connected in parallel in the vicinity of the lower end of the shield ring. However, it is possible to provide the lightning arrester in which the voltage sharing is made uniform without increasing the size of the grounding container by connecting the element columns in series except near the lower end.
【図１】本発明の一実施例を示す避雷器の縦断面図FIG. 1 is a vertical sectional view of a lightning arrester showing an embodiment of the present invention.
【図２】図１に示した避雷器の内部要素の接続展開図2 is a connection development view of internal elements of the lightning arrester shown in FIG.
【図３】図１に示した避雷器の電気的等価回路図FIG. 3 is an electrical equivalent circuit diagram of the lightning arrester shown in FIG.
【図４】避雷器の内部要素の電圧分布図FIG. 4 is a voltage distribution diagram of internal elements of the arrester.
【図５】本発明の他の実施例を示す避雷器の縦断面図FIG. 5 is a vertical sectional view of a lightning arrester showing another embodiment of the present invention.
【図６】従来の避雷器の縦断面図FIG. 6 is a vertical cross-sectional view of a conventional lightning arrester
１…接地容器、２，２ａ，２ｂ，２ｃ…内部要素、２ｘ
…非直線抵抗体、２ｙ…絶縁板、２ｚ…接続板、４…シ
ールドリング。1 ... Ground container, 2, 2a, 2b, 2c ... Internal element, 2x
... non-linear resistor, 2y ... insulating plate, 2z ... connecting plate, 4 ... shield ring.
Claims (1)
する非直線抵抗体を積層した素子柱を備えた内部要素を
収納し、この内部要素の高圧側に円筒状の金属シールド
を配設した避雷器において、 前記内部要素が機械的には複数の前記素子柱を多柱構造
に配設してなり、電気的には前記金属シールドの下端部
近傍で前記素子柱を並列接続してなり、前記下端部近傍
以外では前記素子柱を直列接続してなることを特徴とす
る避雷器。1. A cylindrical grounded container holds therein an internal element having an element column in which a non-linear resistor containing zinc oxide as a main component is laminated, and a cylindrical metal shield is provided on the high-voltage side of the internal element. In the lightning arrester provided, the internal element is mechanically provided with a plurality of the element columns arranged in a multi-column structure, and the element columns are electrically connected in parallel in the vicinity of the lower end portion of the metal shield. The lightning arrester is characterized in that the element columns are connected in series except in the vicinity of the lower end portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29099192A JPH06140209A (en) | 1992-10-29 | 1992-10-29 | Lightning arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29099192A JPH06140209A (en) | 1992-10-29 | 1992-10-29 | Lightning arrester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06140209A true JPH06140209A (en) | 1994-05-20 |
Family
ID=17763048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29099192A Pending JPH06140209A (en) | 1992-10-29 | 1992-10-29 | Lightning arrester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06140209A (en) |
-
1992
- 1992-10-29 JP JP29099192A patent/JPH06140209A/en active Pending
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