JP2017098096A - Surge protective element - Google Patents
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本発明は、落雷等で発生するサージから様々な機器を保護し、事故を未然に防ぐのに使用するサージ防護素子に関する。 The present invention relates to a surge protection element used for protecting various devices from a surge caused by a lightning strike and preventing accidents.
電話機、ファクシミリ、モデム等の通信機器用の電子機器が通信線との接続する部分、電源線、アンテナ或いはＣＲＴ、液晶テレビおよびプラズマテレビ等の画像表示駆動回路等、雷サージや静電気等の異常電圧（サージ電圧）による電撃を受けやすい部分には、異常電圧によって電子機器やこの機器を搭載するプリント基板の熱的損傷又は発火等による破壊を防止するために、サージ防護素子が接続されている。 Abnormal voltage such as lightning surge and static electricity, etc., such as parts where electronic devices for communication equipment such as telephones, facsimiles and modems are connected to communication lines, power lines, antennas or image display drive circuits such as CRTs, liquid crystal televisions and plasma televisions A surge protection element is connected to a portion that is easily subjected to electric shock due to (surge voltage) in order to prevent damage due to thermal damage or ignition of an electronic device or a printed circuit board on which the device is mounted due to abnormal voltage.
従来、例えば特許文献１に示すように、一対の封止電極から対向状態に突出した一対の突出電極部を備え、絶縁性管の内面に放電補助部が形成されたアレスタ型のサージ防護素子が記載されている。通常、このようなサージ防護素子では、炭素材で形成された放電補助部が、一対の突出電極部の間にある中間領域に対向する絶縁性管の内面に形成されている。このような放電補助部は、一般的にはグラファイト等の導電性のイオン源材料で形成され、初期放電を助長するためのイオン源となっている。 Conventionally, as shown in Patent Document 1, for example, an arrester-type surge protection element having a pair of protruding electrode portions protruding in a facing state from a pair of sealing electrodes and having a discharge auxiliary portion formed on the inner surface of an insulating tube is provided. Have been described. Usually, in such a surge protection element, a discharge auxiliary portion made of a carbon material is formed on the inner surface of an insulating tube facing an intermediate region between a pair of protruding electrode portions. Such a discharge auxiliary portion is generally formed of a conductive ion source material such as graphite and serves as an ion source for promoting initial discharge.
上記従来の技術には、以下の課題が残されている。
従来の構造では、放電補助部が、一対の突出電極部の間である中間領域に対向する絶縁性管の内周面にも形成されているため、一対の突出電極部間で生じるアーク放電時の熱及び膨張エネルギーにより損傷、昇華消失してしまい、繰り返し放電時の放電電圧が不安定（放電電圧が上昇する）になるという問題がった。特に、大電流の放電では、放電補助部の昇華消失が顕著になる傾向がある。また、放電電流が保証範囲を大幅に超えてしまうと、電極の設計を変更することが要求されると共に、安定した動作のために、サイズを大型化する、又は並列に接続するなどの対応が必要になる不都合があった。
The following problems remain in the conventional technology.
In the conventional structure, since the discharge auxiliary part is also formed on the inner peripheral surface of the insulating tube facing the intermediate region between the pair of protruding electrode parts, the arc discharge generated between the pair of protruding electrode parts Damage and sublimation disappear due to the heat and expansion energy, and the discharge voltage during repeated discharge becomes unstable (the discharge voltage increases). In particular, in the discharge of a large current, the sublimation disappearance of the discharge auxiliary part tends to become remarkable. Also, if the discharge current greatly exceeds the guaranteed range, it is required to change the design of the electrode, and for stable operation, measures such as increasing the size or connecting in parallel are required. There was an inconvenience that was necessary.
本発明は、前述の課題に鑑みてなされたもので、放電補助部の損傷、昇華消失を抑制することができ、動作の安定性の向上が可能なサージ防護素子を提供することを目的とする。 The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a surge protection element that can suppress damage and sublimation disappearance of a discharge assisting portion and can improve operational stability. .
本発明は、前記課題を解決するために以下の構成を採用した。すなわち、第１の発明に係るサージ防護素子は、絶縁性管と、前記絶縁性管の両端開口部を閉塞して内部に放電制御ガスを封止する一対の封止電極と、前記絶縁性管の内周面にイオン源材料で形成された放電補助部とを備え、一対の前記封止電極が、内方に突出し互いに対向した一対の突出電極部を有し、前記放電補助部が、一対の前記突出電極部の外周面に対向する一対の電極対向領域のうち少なくとも一方のみに形成され、前記絶縁性管の内周面のうち一対の前記電極対向領域の間にある領域が、前記放電補助部が存在しない放電補助部不存在領域とされていることを特徴とする。 The present invention employs the following configuration in order to solve the above problems. That is, the surge protection element according to the first invention includes an insulating tube, a pair of sealing electrodes that closes both ends of the insulating tube and seals a discharge control gas therein, and the insulating tube. And a pair of the sealing electrodes projecting inward and facing each other, and the discharge assisting part is a pair of discharge assisting parts formed of an ion source material on the inner peripheral surface of the discharge assisting part. Formed in at least one of the pair of electrode facing regions facing the outer peripheral surface of the protruding electrode portion, and the region between the pair of electrode facing regions of the inner peripheral surface of the insulating tube is the discharge It is characterized by being a discharge auxiliary part non-existence region where no auxiliary part exists.
本発明のサージ防護素子では、放電補助部が、一対の突出電極部の外周面に対向する一対の電極対向領域のうち少なくとも一方のみに形成され、絶縁性管の内周面のうち一対の電極対向領域の間にある領域が、放電補助部が存在しない放電補助部不存在領域とされているので、アーク放電時の熱及び膨張エネルギーの影響を強く受ける領域に放電補助部が無く、電極対向領域だけに放電補助部があることで、放電補助部の損傷、昇華消失を抑制することができる。 In the surge protection element of the present invention, the discharge assisting portion is formed only in at least one of the pair of electrode facing regions facing the outer peripheral surface of the pair of protruding electrode portions, and the pair of electrodes on the inner peripheral surface of the insulating tube Since the region between the opposing regions is a region where there is no discharge auxiliary portion where there is no discharge auxiliary portion, there is no discharge auxiliary portion in the region that is strongly affected by the heat and expansion energy during arc discharge, By having the discharge auxiliary part only in the region, damage to the discharge auxiliary part and disappearance of sublimation can be suppressed.
第２の発明に係るサージ防護素子は、第１の発明において、前記絶縁性管の軸方向に沿った方向に複数形成されていることを特徴とする。
すなわち、このサージ防護素子では、放電補助部が、絶縁性管の軸方向に沿った方向に複数形成されているので、絶縁性管の軸方向に沿った方向において一部の放電補助部が損傷しても、他の放電補助部が放電補助機能を良好に維持しており、繰り返し放電時でも安定した動作を得ることができる。
In the first invention, a plurality of surge protection elements according to the second invention are formed in a direction along the axial direction of the insulating tube.
That is, in this surge protection element, since a plurality of discharge auxiliary portions are formed in the direction along the axial direction of the insulating tube, some discharge auxiliary portions are damaged in the direction along the axial direction of the insulating tube. Even so, the other discharge assistants maintain the discharge assistant function well, and a stable operation can be obtained even during repeated discharge.
第３の発明に係るサージ防護素子は、第１又は第２の発明において、前記放電補助部が、前記絶縁性管の周方向に複数形成されていることを特徴とする。
すなわち、このサージ防護素子では、放電補助部が、絶縁性管の周方向に複数形成されているので、絶縁性管の周方向において一部の放電補助部が損傷しても、他の放電補助部が放電補助機能を良好に維持しており、繰り返し放電時でも安定した動作を得ることができる。
A surge protection element according to a third invention is characterized in that, in the first or second invention, a plurality of the discharge auxiliary portions are formed in a circumferential direction of the insulating tube.
That is, in this surge protection element, since a plurality of discharge auxiliary portions are formed in the circumferential direction of the insulating tube, even if some discharge auxiliary portions are damaged in the circumferential direction of the insulating tube, other discharge auxiliary portions The section maintains the discharge assist function well, and a stable operation can be obtained even during repeated discharge.
本発明によれば、以下の効果を奏する。
すなわち、本発明に係るサージ防護素子によれば、放電補助部が、一対の突出電極部の外周面に対向する一対の電極対向領域のうち少なくとも一方のみに形成され、絶縁性管の内周面のうち一対の電極対向領域の間にある領域が、放電補助部が存在しない放電補助部不存在領域とされているので、放電補助部がアーク放電時の熱及び膨張エネルギーの影響を受け難く、放電補助部の損傷、昇華消失を抑制することができる。
したがって、サージ電流や放電回数が増えてもサージ防護素子性能を良好に維持することが可能になる。特に、本発明に係るサージ防護素子は、大電流サージ耐性が要求されるインフラ用（鉄道関連、再生エネルギー関連（太陽電池、風力発電等））の電源及び通信設備に好適である。
The present invention has the following effects.
That is, according to the surge protection element of the present invention, the discharge assisting portion is formed only in at least one of the pair of electrode facing regions facing the outer peripheral surface of the pair of protruding electrode portions, and the inner peripheral surface of the insulating tube Since the region between the pair of electrode facing regions is a discharge auxiliary portion absent region where there is no discharge auxiliary portion, the discharge auxiliary portion is not easily affected by heat and expansion energy during arc discharge, Damage to the discharge auxiliary part and sublimation disappearance can be suppressed.
Therefore, even if the surge current and the number of discharges increase, it is possible to maintain the surge protection element performance satisfactorily. In particular, the surge protection element according to the present invention is suitable for power supplies and communication facilities for infrastructure (railway-related, renewable energy-related (solar cell, wind power generation, etc.)) that require high current surge resistance.
以下、本発明に係るサージ防護素子の第１実施形態を、図１を参照しながら説明する。なお、以下の説明に用いる各図面では、各部材を認識可能又は認識容易な大きさとするために縮尺を適宜変更している。 Hereinafter, a first embodiment of a surge protection element according to the present invention will be described with reference to FIG. In each drawing used for the following description, the scale is appropriately changed in order to make each member recognizable or easily recognizable.
本実施形態のサージ防護素子１は、図１に示すように、絶縁性管２と、絶縁性管２の両端開口部を閉塞して内部に放電制御ガスを封止する一対の封止電極３と、絶縁性管２の内周面にイオン源材料で形成された放電補助部４とを備えている。
上記一対の封止電極３は、内方に突出し互いに対向した一対の突出電極部５を有している。
As shown in FIG. 1, the surge protection element 1 of the present embodiment includes an insulating tube 2 and a pair of sealing electrodes 3 that closes both ends of the insulating tube 2 and seals the discharge control gas inside. And an auxiliary discharge portion 4 made of an ion source material on the inner peripheral surface of the insulating tube 2.
The pair of sealing electrodes 3 has a pair of protruding electrode portions 5 that protrude inward and face each other.
また、上記放電補助部４は、一対の突出電極部５の外周面に対向する一対の電極対向領域Ａ１のうち少なくとも一方のみに形成され、絶縁性管２の内周面のうち一対の電極対向領域Ａ１の間にある領域が、放電補助部４が存在しない放電補助部不存在領域Ａ２とされている。
放電補助部４は、導電性材料であって、例えば炭素材で形成された放電補助部である。
The discharge auxiliary portion 4 is formed only in at least one of the pair of electrode facing regions A1 facing the outer peripheral surface of the pair of protruding electrode portions 5, and faces the pair of electrodes on the inner peripheral surface of the insulating tube 2. A region between the regions A1 is a discharge auxiliary portion absence region A2 in which the discharge auxiliary portion 4 does not exist.
The discharge auxiliary part 4 is a conductive material and is, for example, a discharge auxiliary part formed of a carbon material.
なお、本実施形態では、放電補助部４は、一対の突出電極部５の外周面に対向する一対の電極対向領域Ａ１の両方に軸線Ｃに沿って直線状に形成されている。これらの放電補助部４は、突出電極部５の先端近傍に対向した位置から基端近傍に対向した位置まで延在している。
また、図１では、放電補助部４を軸線Ｃに沿った２本のみ図示しているが、周方向に互いに間隔を空けて複数本形成しても構わない。
In the present embodiment, the discharge auxiliary portion 4 is formed linearly along the axis C in both the pair of electrode facing regions A1 facing the outer peripheral surfaces of the pair of protruding electrode portions 5. These discharge assisting portions 4 extend from a position facing the vicinity of the distal end of the protruding electrode portion 5 to a position facing the vicinity of the proximal end.
Further, in FIG. 1, only two discharge assisting portions 4 along the axis C are shown, but a plurality of discharge assisting portions 4 may be formed at intervals in the circumferential direction.
上記封止電極３は、例えば４２アロイ（Ｆｅ：５８ｗｔ％、Ｎｉ：４２ｗｔ％）やＣｕ等で構成されている。
封止電極３は、絶縁性管２の両端開口部に導電性融着材（図示略）により加熱処理によって密着状態に固定されている円板状のフランジ部７を有している。このフランジ部７の内側に、内方に突出していると共に絶縁性管２の内径よりも外径の小さな円柱状の突出電極部５が一体に設けられている。
The sealing electrode 3 is made of, for example, 42 alloy (Fe: 58 wt%, Ni: 42 wt%), Cu, or the like.
The sealing electrode 3 has a disk-like flange portion 7 that is fixed in close contact by a heat treatment with a conductive adhesive (not shown) at both ends of the insulating tube 2. A cylindrical protruding electrode portion 5 that protrudes inward and has an outer diameter smaller than the inner diameter of the insulating tube 2 is integrally provided inside the flange portion 7.
上記絶縁性管２は、アルミナなどの結晶性セラミックス材である。なお、絶縁性管２は、鉛ガラス等のガラス管で形成しても構わない。 The insulating tube 2 is a crystalline ceramic material such as alumina. The insulating tube 2 may be formed of a glass tube such as lead glass.
上記導電性融着材は、例えばＡｇを含むろう材としてＡｇ−Ｃｕろう材で形成されている。
上記絶縁性管２内に封入される放電制御ガスは、不活性ガス等であって、例えばＨｅ，Ａｒ，Ｎｅ，Ｘｅ，Ｋｒ，ＳＦ６，ＣＯ２，Ｃ３Ｆ８，Ｃ２Ｆ６，ＣＦ４，Ｈ２，大気等及びこれらの混合ガスが採用される。
The conductive fusing material is formed of, for example, an Ag—Cu brazing material as a brazing material containing Ag.
The discharge control gas sealed in the insulating tube 2 is an inert gas or the like, for example, He, Ar, Ne, Xe, Kr, SF 6 , CO 2 , C 3 F 8 , C 2 F 6 , CF 4 , H 2 , the atmosphere, etc. and a mixed gas thereof are employed.
このサージ防護素子１では、過電圧又は過電流が侵入すると、まず放電補助部４と突出電極部５との間で初期放電が行われ、この初期放電をきっかけに、さらに放電が進展して一対のフランジ部７間又は突出電極部５間で放電が行われる。 In this surge protection element 1, when an overvoltage or overcurrent enters, an initial discharge is first performed between the discharge auxiliary portion 4 and the protruding electrode portion 5, and the discharge further develops triggered by this initial discharge. Discharge is performed between the flange portions 7 or between the protruding electrode portions 5.
このように本実施形態のサージ防護素子１では、放電補助部４が、一対の突出電極部５の外周面に対向する一対の電極対向領域Ａ１のうち少なくとも一方のみに形成され、絶縁性管２の内周面のうち一対の電極対向領域Ａ１の間にある領域が、放電補助部４が存在しない放電補助部不存在領域Ａ２とされているので、アーク放電時の熱及び膨張エネルギーの影響を強く受ける領域に放電補助部４が無く、電極対向領域Ａ１だけに放電補助部４があることで、放電補助部４の損傷、昇華消失を抑制することができる。 As described above, in the surge protection device 1 of the present embodiment, the discharge auxiliary portion 4 is formed only in at least one of the pair of electrode facing regions A1 facing the outer peripheral surfaces of the pair of protruding electrode portions 5, and the insulating tube 2. The region between the pair of electrode facing regions A1 in the inner peripheral surface is a discharge auxiliary portion non-existing region A2 where the discharge auxiliary portion 4 does not exist, so the influence of heat and expansion energy during arc discharge is affected. Since the discharge auxiliary portion 4 is not present in the strongly received region and the discharge auxiliary portion 4 is provided only in the electrode facing region A1, damage to the discharge auxiliary portion 4 and disappearance of sublimation can be suppressed.
次に、本発明に係るサージ防護素子の第２から第４実施形態について、図２から図４を参照して以下に説明する。なお、以下の各実施形態の説明において、上記実施形態において説明した同一の構成要素には同一の符号を付し、その説明は省略する。 Next, second to fourth embodiments of the surge protection element according to the present invention will be described below with reference to FIGS. In the following description of each embodiment, the same constituent elements described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
第２実施形態と第１実施形態との異なる点は、第１実施形態では、放電補助部４が突出電極部５の先端近傍に対向した位置から基端近傍に対向した位置まで長く延在しているのに対し、第２実施形態のサージ防護素子２１では、図２に示すように、放電補助部２４が短い線状に形成され、突出電極部５の基端近傍に対向した位置に配されている点である。
すなわち、第２実施形態では、軸方向に沿った一対の放電補助部２４間の距離が、第１実施形態の一対の放電補助部４間よりも長く設定されている。
The difference between the second embodiment and the first embodiment is that, in the first embodiment, the discharge auxiliary portion 4 extends long from a position facing the vicinity of the distal end of the protruding electrode portion 5 to a position facing the vicinity of the proximal end. On the other hand, in the surge protection element 21 of the second embodiment, as shown in FIG. 2, the discharge auxiliary portion 24 is formed in a short linear shape and is arranged at a position facing the vicinity of the proximal end of the protruding electrode portion 5. It is a point that has been.
That is, in the second embodiment, the distance between the pair of auxiliary discharge portions 24 along the axial direction is set longer than between the pair of auxiliary discharge portions 4 of the first embodiment.
したがって、第２実施形態のサージ防護素子２１では、第１実施形態と同様に、放電補助部不存在領域Ａ２に放電補助部４が無く、電極対向領域Ａ１だけに放電補助部４があることで、放電補助部４の損傷、昇華消失を抑制することができるが、第１実施形態に比べて放電補助部４が放電補助部不存在領域Ａ２から離れているので、より損傷が抑制されて安定した動作が得られる。 Therefore, in the surge protection element 21 of the second embodiment, as in the first embodiment, there is no discharge auxiliary portion 4 in the discharge auxiliary portion absent region A2, and there is the discharge auxiliary portion 4 only in the electrode facing region A1. Although the damage and sublimation disappearance of the discharge auxiliary part 4 can be suppressed, the discharge auxiliary part 4 is separated from the discharge auxiliary part non-existing region A2 as compared with the first embodiment, so that the damage is further suppressed and stable. Can be obtained.
次に、第３実施形態と第１実施形態との異なる点は、第１実施形態は、放電補助部４が直線状に形成されているのに対し、第３実施形態のサージ防護素子３１では、図３に示すように、放電補助部３４が、点線状に形成されている点である。すなわち、第３実施形態では、点状の放電補助部３４が、絶縁性管２の軸方向に沿った方向に複数並んで形成されている。 Next, the difference between the third embodiment and the first embodiment is that in the first embodiment, the discharge assisting portion 4 is formed in a straight line, whereas in the surge protection element 31 of the third embodiment. As shown in FIG. 3, the discharge auxiliary portion 34 is formed in a dotted line shape. That is, in the third embodiment, a plurality of dotted discharge auxiliary portions 34 are formed side by side in a direction along the axial direction of the insulating tube 2.
したがって、第３実施形態のサージ防護素子３１では、放電補助部３４が絶縁性管２の軸方向に沿った方向に複数形成されているので、絶縁性管２の軸方向に沿った方向において一部の放電補助部３４が損傷しても、他の放電補助部３４が初期放電機能を良好に維持しており、繰り返し放電時でも安定した動作を得ることができる。 Therefore, in the surge protection element 31 of the third embodiment, a plurality of discharge auxiliary portions 34 are formed in the direction along the axial direction of the insulating tube 2. Even if the discharge assisting part 34 of the part is damaged, the other discharge assisting part 34 maintains the initial discharge function well, and a stable operation can be obtained even during repeated discharge.
次に、第４実施形態と第１実施形態との異なる点は、第１実施形態は、放電補助部４が直線状に形成されているのに対し、第４実施形態のサージ防護素子４１では、図４に示すように、放電補助部４４ａ，４４ｂが、複数の点状及び円形状に形成されている点である。すなわち、第４実施形態では、点状の放電補助部４４ａと円形状の放電補助部４４ｂとが軸方向に沿った方向及び周方向に複数形成されている点である。 Next, the difference between the fourth embodiment and the first embodiment is that, in the first embodiment, the discharge assisting portion 4 is formed in a straight line, whereas in the surge protection element 41 of the fourth embodiment. As shown in FIG. 4, the discharge auxiliary portions 44a and 44b are formed in a plurality of dots and circles. That is, in the fourth embodiment, a plurality of dotted discharge auxiliary portions 44a and circular discharge auxiliary portions 44b are formed in the direction along the axial direction and in the circumferential direction.
また、第４実施形態では、放電補助部４４ａ，４４ｂが、一対の突出電極部５の外周面に対向する一対の電極対向領域Ａ１のうち一方のみに形成されている点で、第１実施形態と異なっている。すなわち、絶縁性管２の片側にのみ放電補助部４４ａ，４４ｂが形成されている。 Further, in the fourth embodiment, the discharge auxiliary portions 44a and 44b are formed only in one of the pair of electrode facing regions A1 facing the outer peripheral surfaces of the pair of protruding electrode portions 5, in the first embodiment. Is different. That is, discharge auxiliary portions 44 a and 44 b are formed only on one side of the insulating tube 2.
したがって、第４実施形態のサージ防護素子４１では、放電補助部４４ａ，４４ｂが、絶縁性管２の軸方向に沿った方向及び周方向に複数形成されているので、絶縁性管２の軸方向に沿った方向及び周方向において一部の放電補助部４４ａ，４４ｂが損傷しても、他の放電補助部４４ａ，４４ｂが初期放電機能を良好に維持しており、繰り返し放電時でも安定した動作を得ることができる。 Accordingly, in the surge protection element 41 of the fourth embodiment, the discharge auxiliary portions 44a and 44b are formed in a plurality along the axial direction of the insulating tube 2 and in the circumferential direction. Even if some discharge auxiliary portions 44a and 44b are damaged in the direction along the circumference and the circumferential direction, the other discharge auxiliary portions 44a and 44b maintain the initial discharge function well, and the operation is stable even during repeated discharge. Can be obtained.
次に、本発明に係るサージ防護素子を、上記第１及び第２実施形態に基づいて実際に作製した実施例により評価した結果を具体的に説明する。 Next, the result of evaluating the surge protection element according to the present invention by an example actually produced based on the first and second embodiments will be described in detail.
第１実施形態のサージ防護素子の実施例として、一対の放電補助部間の距離を１．０ｍｍとしたものを実施例１とし、第２実施形態のサージ防護素子の実施例として、一対の放電補助部間の距離を２．０ｍｍとしたものを実施例２として作製した。また、いずれも一対の突出電極部５間の距離を０．６ｍｍに設定した。さらに、線状の放電補助部は、周方向に互いに間隔を空けて４対形成した。
絶縁性管は、φ８ｍｍの円筒状のものを使用した。
As an example of the surge protection element of the first embodiment, the distance between the pair of discharge assisting portions is 1.0 mm, and the example of the surge protection element of the second embodiment is a pair of discharges. The distance between the auxiliary parts was 2.0 mm and was produced as Example 2. In both cases, the distance between the pair of protruding electrode portions 5 was set to 0.6 mm. Furthermore, four pairs of linear discharge auxiliary portions were formed at intervals in the circumferential direction.
As the insulating tube, a cylindrical tube with a diameter of 8 mm was used.
なお、比較のために参考例として、図５に示すように、一対の突出電極部５の外周面に対向する一対の電極対向領域Ａ１だけでなく一対の電極対向領域Ａ１間にも連続して延在する放電補助部１０４を、絶縁性管２の内周面に、周方向に互いに間隔を空けて４本形成したサージ防護素子１０１を作製した。 For comparison, as a reference example, as shown in FIG. 5, not only the pair of electrode facing regions A1 facing the outer peripheral surface of the pair of protruding electrode portions 5 but also a pair of electrode facing regions A1 are continuously provided. A surge protection device 101 was formed in which four extending discharge auxiliary portions 104 were formed on the inner peripheral surface of the insulating tube 2 at intervals in the circumferential direction.
これらの参考例及び実施例１，２について、サージ条件として、４０ｋＶ／２０ｋＡコンビネーションサージを繰り返し印加した際の直流放電開始電圧Ｖｓを測定した。その際の放電開始電圧Ｖｓとサージ印加回数との関係を示すグラフを、図６に示す。また、放電開始電圧変動率とサージ印加回数との関係を示すグラフを、図７に示す。 For these reference examples and Examples 1 and 2, the DC discharge start voltage V s was measured when a 40 kV / 20 kA combination surge was repeatedly applied as a surge condition. The graph showing the relationship between the discharge start voltage V s and the surge application times at that time are shown in FIG. Moreover, the graph which shows the relationship between the discharge start voltage fluctuation rate and the frequency | count of surge application is shown in FIG.
これらの結果からわかるように、一対の電極対向領域Ａ１間にも放電補助部１０４が延在する参考例では、サージ印加回数が増えるほど、放電開始電圧の変動率が著しく増大しているのに対し、本発明の実施例１，２では、参考例に比べて放電開始電圧の変動率の増大が抑制され、変動が少ない。また、サージ印加回数１，２回の初期においては、一対の放電補助部間の距離を１．０ｍｍとした実施例１に比べて、一対の放電補助部間の距離を２．０ｍｍとした実施例２の方が、放電開始電圧の変動率が小さい傾向にあることがわかる。 As can be seen from these results, in the reference example in which the discharge auxiliary portion 104 extends between the pair of electrode facing regions A1, the fluctuation rate of the discharge start voltage increases remarkably as the number of surges applied increases. On the other hand, in Examples 1 and 2 of the present invention, the increase in the variation rate of the discharge start voltage is suppressed and the variation is less than that in the reference example. In addition, in the initial stage of the number of applied surges of 1 and 2, compared to Example 1 in which the distance between the pair of discharge assisting portions was 1.0 mm, the distance between the pair of discharge assisting portions was set to 2.0 mm. It can be seen that Example 2 has a smaller fluctuation rate of the discharge start voltage.
なお、本発明の技術範囲は上記各実施形態および上記各実施例に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。
例えば、上記各実施形態の放電補助部を組み合わせても構わない。
The technical scope of the present invention is not limited to the above embodiments and examples, and various modifications can be made without departing from the spirit of the present invention.
For example, you may combine the discharge auxiliary | assistant part of said each embodiment.
１，２１，３１，４１…サージ防護素子、２…絶縁性管、３…封止電極、４…放電補助部、５…突出電極部、Ａ１…電極対向領域、Ａ２…放電補助部不存在領域 1, 21, 31, 41 ... surge protection element, 2 ... insulating tube, 3 ... sealing electrode, 4 ... discharge auxiliary part, 5 ... protruding electrode part, A1 ... electrode facing area, A2 ... discharge auxiliary part absent area
Claims (3)
前記絶縁性管の両端開口部を閉塞して内部に放電制御ガスを封止する一対の封止電極と、
前記絶縁性管の内周面にイオン源材料で形成された放電補助部とを備え、
一対の前記封止電極が、内方に突出し互いに対向した一対の突出電極部を有し、
前記放電補助部が、一対の前記突出電極部の外周面に対向する一対の電極対向領域のうち少なくとも一方のみに形成され、
前記絶縁性管の内周面のうち一対の前記電極対向領域の間にある領域が、前記放電補助部が存在しない放電補助部不存在領域とされていることを特徴とするサージ防護素子。 An insulating tube;
A pair of sealing electrodes for closing the opening at both ends of the insulating tube and sealing the discharge control gas inside;
A discharge auxiliary portion formed of an ion source material on the inner peripheral surface of the insulating tube;
The pair of sealing electrodes has a pair of protruding electrode portions protruding inward and facing each other,
The discharge assisting portion is formed only in at least one of the pair of electrode facing regions facing the outer peripheral surfaces of the pair of protruding electrode portions;
A surge protection element, wherein a region between the pair of electrode facing regions on the inner peripheral surface of the insulating tube is a discharge auxiliary portion non-existing region where the discharge auxiliary portion does not exist.
前記放電補助部が、前記絶縁性管の軸方向に沿った方向に複数形成されていることを特徴とするサージ防護素子。 The surge protection element according to claim 1,
A surge protection element, wherein a plurality of the discharge auxiliary portions are formed in a direction along the axial direction of the insulating tube.
前記放電補助部が、前記絶縁性管の周方向に複数形成されていることを特徴とするサージ防護素子。 The surge protection element according to claim 1 or 2,
A surge protection element, wherein a plurality of the discharge auxiliary portions are formed in a circumferential direction of the insulating tube.
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