JPH0631035U - Insulator protection device - Google Patents

Insulator protection device

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Publication number
JPH0631035U
JPH0631035U JP6737292U JP6737292U JPH0631035U JP H0631035 U JPH0631035 U JP H0631035U JP 6737292 U JP6737292 U JP 6737292U JP 6737292 U JP6737292 U JP 6737292U JP H0631035 U JPH0631035 U JP H0631035U
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JP
Japan
Prior art keywords
insulating cover
current limiting
limiting element
cover
insulator
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.)
Granted
Application number
JP6737292U
Other languages
Japanese (ja)
Other versions
JP2596306Y2 (en
Inventor
正次 高岡
憲治 武田
富裕 丹下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Kouatsu Electric Co
Original Assignee
Nippon Kouatsu Electric Co
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Publication date
Application filed by Nippon Kouatsu Electric Co filed Critical Nippon Kouatsu Electric Co
Priority to JP1992067372U priority Critical patent/JP2596306Y2/en
Publication of JPH0631035U publication Critical patent/JPH0631035U/en
Application granted granted Critical
Publication of JP2596306Y2 publication Critical patent/JP2596306Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

(57)【要約】 【目的】 絶縁カバ−に内蔵した限流素子の放電耐量を
越えるような過大な雷サ−ジの侵入により素子外絡が発
生した場合に、カバ−内においてア−クが発生して内圧
上昇が起こることによるカバ−の飛散、破損並びに素子
の落下事故を防止する。 【構成】 碍子体2の頭部を被覆する絶縁カバー20内
に限流素子26を内蔵する。限流素子26を内蔵する収
納部内壁29に破裂ガイド溝29aを形成する。絶縁カ
バー20の一部に外部に開口する扉25r〜25uを設
ける。破裂ガイド溝29aと扉25r〜25uとの間を
圧力放出路a,bで連通する。
(57) [Abstract] [Purpose] When an element external fault occurs due to an excessive lightning surge penetration that exceeds the discharge withstand capacity of the current limiting element built into the insulating cover, an arc is created in the cover. It is possible to prevent the cover from scattering and being damaged and the element from dropping due to the rise of the internal pressure. A current limiting element 26 is built in an insulating cover 20 that covers the head of the insulator 2. A rupture guide groove 29a is formed in the inner wall 29 of the housing portion that houses the current limiting element 26. Doors 25r to 25u that open to the outside are provided in a part of the insulating cover 20. The burst guide groove 29a and the doors 25r to 25u communicate with each other through the pressure release paths a and b.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

本考案は高圧あるいは特別高圧の配電線路において使用する碍子保護装置の改 良に関するものである。 The present invention relates to improvement of an insulator protection device used in a high-voltage or extra-high-voltage power distribution line.

【0002】[0002]

【従来の技術】[Prior art]

碍子体を雷サ−ジ等の異常電圧から保護するために無続流の限流素子(ZnO 素子)を絶縁カバ−に内蔵した碍子保護装置がすでに提案されている。そして、 従来、この限流素子は絶縁カバー内にほぼ密封状態で収納されている。 An insulator protection device has been proposed in which a non-continuous current limiting element (ZnO element) is built in an insulating cover in order to protect the insulator body from an abnormal voltage such as lightning surge. Further, conventionally, the current limiting element is housed in an insulating cover in a substantially sealed state.

【0003】[0003]

【考案が解決しようとする課題】[Problems to be solved by the device]

ところで、侵入する雷サ−ジが過大であり、それが内蔵した限流素子(ZnO 素子)の放電耐量の能力を超えるような場合には、限流素子の外面(沿面)で閃 絡(外絡)が発生し、その外絡時のア−クと同ア−クにより絶縁カバ−内では急 激な圧力上昇が起こる。そのため前記従来のように、限流素子が絶縁カバー内に ほぼ密封状態で収納されているものにおいては、上記カバ−自体の焼損や破裂さ らにはカバ−内の限流素子、電極類の飛散、落下等を招くことになる。 By the way, if the lightning surge that penetrates is too large to exceed the discharge withstand capability of the built-in current limiting element (ZnO element), a flash (outside surface) of the current limiting element Occurs, and a sudden pressure rise occurs in the insulating cover due to the arc and the arc at the time of the external fault. Therefore, in the case where the current limiting element is housed in the insulating cover in a substantially hermetically sealed state as in the above-mentioned conventional case, the current limiting element and electrodes in the cover may be damaged due to burning or rupture of the cover itself. It will cause scattering and falling.

【0004】 そこで本考案は、このア−クや上昇した圧力を速やかに絶縁カバ−外へ放出し 、上記の課題を解決することを目的とするものである。Therefore, the present invention aims to solve the above-mentioned problems by promptly discharging the arc and the increased pressure to the outside of the insulating cover.

【0005】[0005]

【課題を解決するための手段】[Means for Solving the Problems]

本考案は上記の課題を解決するために、碍子体の頭部を被覆する絶縁カバー内 に限流素子を内蔵して、該絶縁カバーを碍子体の頭部に被着し、その限流素子と 碍子体に支持された電線とを電気的に接続するものにおいて、 限流素子(26)を収納する収納部内壁(29)に破裂ガイド溝(29a)を 形成し、絶縁カバー(20)の一部には、所定の内圧により絶縁カバー外に開口 する扉(25r〜25u)を設け、上記破裂ガイド溝(29a)部と扉(25r 〜25u)との間を、圧力放出路(a)(b)で連通したことを特徴とするもの である。 In order to solve the above problems, the present invention has a current limiting element built in an insulating cover for covering the head of an insulator body, and the insulating cover is attached to the head portion of the insulator body. In an electrical connection between an insulator and an electric wire supported by an insulator, a rupture guide groove (29a) is formed in an inner wall (29) of a housing portion that houses a current limiting element (26), and an insulating cover (20) is formed. A door (25r to 25u) that opens to the outside of the insulating cover by a predetermined internal pressure is provided in part, and a pressure release path (a) is provided between the burst guide groove (29a) and the door (25r to 25u). The feature is that the communication is performed in (b).

【0006】[0006]

【実施例】【Example】

本考案の実施例を図面に基づき説明する。 碍子体2は、その外周面に深溝2aが形成され、その頭部2bの外周には掛け止 め用の凹部2cが形成されている。 An embodiment of the present invention will be described with reference to the drawings. The insulator body 2 has a deep groove 2a formed on the outer peripheral surface thereof, and a recessed portion 2c for latching is formed on the outer periphery of a head portion 2b thereof.

【0007】 クランプ金具4は、下部6aを前記掛け止め用の凹部2cに係止させて上部を 上方に突出させた2本の支持ボルト6と、中央に絶縁電線3を嵌入させるための 篏合凹部5aを設けさらに前記の支持ボルト6に挿通したキヤップ金具5と、支 持ボルト6に螺挿して該支持ボルト6とキヤップ金具5を共に碍子体2の頭部2 bに固定するためのナット7と、両側を前記両支持ボルト6、6に挿通させさら に下方に突出する中央部9aを絶縁電線3の上面に当接させるようにした押え金 具9と、該押え金具9の上面側において支持ボルト6、6に螺挿して押え金具9 を下方側に押圧するようにしたナット8と、前記キヤップ金具5の嵌合凹部5a にその凹部11aが嵌合すると共に前記支持ボルト6の一方に嵌挿した座金11 と、碍子体の頭部2bに密着状態で被着したゴムパッキン12とにより構成され ている。The clamp metal fitting 4 has two support bolts 6 whose lower portion 6a is locked in the latching recessed portion 2c and whose upper portion protrudes upward, and a fitting for inserting the insulated wire 3 in the center. A cap member 5 having a recess 5a and further inserted through the support bolt 6, and a nut for screwing the support bolt 6 to fix the support bolt 6 and the cap member 5 together to the head 2b of the insulator body 2. 7, a presser foot 9 in which both sides are inserted into the support bolts 6, 6 and a central portion 9a protruding downward is brought into contact with the upper surface of the insulated wire 3, and an upper surface side of the presser metal fitting 9 , The nut 8 is screwed into the support bolts 6, 6 to press the retainer fitting 9 downward, and the recess 11a is fitted into the fitting recess 5a of the cap fitting 5 and one of the support bolts 6 Washer 11 inserted into , A rubber packing 12 adhered to the head portion 2b of the insulator body in a close contact state.

【0008】 また、13は本体碍子2の下端2dにセメント14により固着したベ−ス金具 であり、同金具13の下面13a側には下方へ突出したボルト状のピン15が固 設されている。そして、このピン15を腕金16の取付穴16bにその上面16 a側から差し込み、腕金16の下面から突出した同ピン15のネジ部に対しナッ トをネジ着して碍子体2を腕金16に取付固定するようになっている。Reference numeral 13 is a base metal fitting fixed to the lower end 2d of the main body insulator 2 with cement 14, and a bolt-shaped pin 15 projecting downward is fixed to the lower surface 13a side of the metal fitting 13. . Then, the pin 15 is inserted into the mounting hole 16b of the arm member 16 from the upper surface 16a side thereof, and a nut is screwed onto the thread portion of the pin 15 protruding from the lower surface of the arm member 16 to attach the insulator body 2 to the arm. It is designed to be attached and fixed to the gold 16.

【0009】 また、20は一部絶縁被覆を剥がした状態の絶縁電線3の支持の際に充電部と なるキヤップ金具5の外周を覆うようにした絶縁カバ−であり、碍子体2に対し 取脱自在に被着するようにしたもので、同カバ−は周方向に2つに分割できるよ うになっており、全体的には下方に広がる末広がりの筒状に形成され、さらに下 端側が開口している。Reference numeral 20 denotes an insulating cover that covers the outer periphery of the cap metal fitting 5 that serves as a charging portion when supporting the insulated electric wire 3 with the insulating coating partially peeled off. The cover is detachably attached, and the cover can be divided into two in the circumferential direction. It is formed into a divergent tubular shape that spreads downwards, and the lower end side is open. is doing.

【0010】 また上記絶縁カバ−20は、耐候性、絶縁性を有するポリエチレン等の合成樹 脂あるいはEPMやEPDMのゴムからなり、前記したように上端の合体部20 aを中心にして下部側が両側方へ開くように2つの分割体20b、20cから構 成されている。The insulating cover 20 is made of synthetic resin such as polyethylene having weather resistance and insulating properties or rubber of EPM or EPDM. As described above, the lower side is centered on the united portion 20 a at the upper end. It is composed of two divided bodies 20b and 20c so as to open toward one side.

【0011】 次に右側の分割体20cを上方へ開放した状態を示す図3乃至図7により、絶 縁カバー20の構造を詳述する。 20dは絶縁カバ−20の上部側面に位置して突出形成した筒状で先細の電線 挿通部であり、同部の口径は挿通する絶縁電線3の外周径より若干大きく形成さ れている。Next, the structure of the insulating cover 20 will be described in detail with reference to FIGS. 3 to 7 showing a state in which the right divided body 20c is opened upward. Reference numeral 20d denotes a cylindrical and tapered electric wire insertion portion formed on the upper side surface of the insulating cover 20 so as to project. The diameter of the portion is slightly larger than the outer diameter of the insulated electric wire 3 to be inserted.

【0012】 20j、20kおよび25j、25kは分割体20b、20cの合体時の合わ せ面、つまり6組の接合部20lと20m、20nと20o、20pと20q、 20rと20sおよび各扉25r〜25uの接合部25aと25b、25cと2 5dに対向的に設けられた止着用の穴と鉤をそれぞれ示す。なお、この6組の内 の下部に位置する2組25aと25b及び25cと25dについては、絶縁カバ −の放出部20u、20uを構成する。また、20e、20fは分割体20b、 20cの上部壁であり、鉛直に形成され合体時に両者で円筒形になる。20j, 20k and 25j, 25k are mating surfaces when the divided bodies 20b, 20c are combined, that is, 6 sets of joints 20l and 20m, 20n and 20o, 20p and 20q, 20r and 20s and doors 25r to. The fastening holes and hooks are provided to face the 25u joints 25a and 25b, 25c and 25d, respectively. The two sets 25a and 25b and 25c and 25d located in the lower part of the six sets form the emitting portions 20u and 20u of the insulating cover. Also, 20e and 20f are upper walls of the divided bodies 20b and 20c, which are formed vertically and both of which have a cylindrical shape when combined.

【0013】 20g、20hは上部壁20e、20fに連続する下部壁であり、下方に行く にしたがって広がる末広がりの筒形状になっている。なお、上記分割体の内、一 方の分割体20b側の下部壁20gの中央部20g1のみが特に外側方へ膨出し た形状になっている。Reference numerals 20g and 20h denote lower walls that are continuous with the upper walls 20e and 20f, and have a cylindrical shape that widens toward the bottom. It should be noted that among the above-mentioned divided bodies, only the central portion 20g 1 of the lower wall 20g on the side of one of the divided bodies 20b has a shape which bulges particularly outward.

【0014】 23は前記下部壁20gの膨出した中央部20g1と下部壁20gに対し同心 的に形成された収納部内壁29とによって形成された平面が円弧状の収納部であ り、同部23には後述するように平面が円弧状の限流素子26等が内蔵される。Reference numeral 23 denotes an accommodating portion whose plane is formed by a bulged central portion 20g 1 of the lower wall 20g and an accommodating portion inner wall 29 formed concentrically with the lower wall 20g. As will be described later, the portion 23 contains a current limiting element 26 having a circular arc-shaped plane.

【0015】 22a、22b、22c、22dは遮蔽板で、前記収納部内壁29の内面にお いて、絶縁カバーの中心に向って一体的に突出形成され、かつ平面が略C形の半 円に形成されている。また、これらの4枚の遮蔽板22a、22b、22c、2 2dは適宜間隔を保って上から下方向に順次形成されている。Reference numerals 22a, 22b, 22c, and 22d denote shield plates, which are integrally formed on the inner surface of the inner wall 29 of the housing portion so as to project toward the center of the insulating cover and have a substantially C-shaped plane. Has been formed. Further, these four shield plates 22a, 22b, 22c, 22d are sequentially formed from the top to the bottom at appropriate intervals.

【0016】 また、24a、24b、24c、24dは前記遮蔽板22a、22b、22c 、22dに対向して同じく他方の分割体20cの下部壁20hの内面に形成した 遮蔽板であり、これら分割体20b、20の内面に形成した前記各遮蔽板は、絶 縁カバ−20を、図1のように碍子体2に対し被着した際に上部に位置する2枚 の遮蔽板22a、22bおよび24a、24bの先端がキヤップ金具5の側周面 5bに当接し、また中間部の遮蔽部22cおよび24cの上面がキヤップ金具5 の下端面5cに当接し、さらに最下部の遮蔽板22dおよび24dの上面が碍子 体2の頭部2bに形成したひだ部2dの下面2fにそれぞれ当接するように形成 されいる。Reference numerals 24a, 24b, 24c and 24d denote shield plates formed on the inner surface of the lower wall 20h of the other divided body 20c so as to face the shield plates 22a, 22b, 22c and 22d. The shielding plates formed on the inner surfaces of 20b and 20 are the two shielding plates 22a, 22b and 24a located at the top when the insulating cover 20 is attached to the insulator body 2 as shown in FIG. , 24b are in contact with the side peripheral surface 5b of the cap metal fitting 5, and the upper surfaces of the intermediate shielding portions 22c and 24c are in contact with the lower end surface 5c of the cap metal fitting 5, and further the lowermost shield plates 22d and 24d are The upper surface is formed so as to abut on the lower surface 2f of the fold portion 2d formed on the head portion 2b of the insulator body 2, respectively.

【0017】 図1において、26は電圧非直線性に優れた酸化亜鉛(ZnO)を主成分とす る平面形状が円弧状の限流素子で、前記絶縁カバ−20の一方の分割体20bに 形成した収納部23に内蔵されている。In FIG. 1, reference numeral 26 is a current limiting element whose main shape is zinc oxide (ZnO), which is excellent in voltage non-linearity, and which has a circular arc shape in a plan view. It is built in the formed storage part 23.

【0018】 27は前記限流素子26の上部側に接続した充電側電極、28は限流素子26 の下部側に接続した接地側電極であり、限流素子26と共に凹凸状に形成した収 納部23の開口部23a側から押し込むにして収納部23内に収納されている。 なお、充電側電極27はその突出部27aが収納部23の上部側に設けた導出穴 23bから上方へ突出し、さらに穴から突出した部分には接触片30を止着して いる。Reference numeral 27 denotes a charging side electrode connected to the upper side of the current limiting element 26, and 28 denotes a grounding side electrode connected to the lower side of the current limiting element 26, which is formed in an uneven shape together with the current limiting element 26. It is stored in the storage portion 23 by being pushed in from the opening 23a side of the portion 23. The charging side electrode 27 has a protruding portion 27a protruding upward from a lead-out hole 23b provided on the upper side of the housing portion 23, and a contact piece 30 is fixed to the portion protruding from the hole.

【0019】 32a、32bは半リング状の放電電極で、両分割体20b、20cの下部壁 20g、20hの下端にそれぞれ形成した放電電極収納部20g2、20h2に 収納配置されている。一方の電極32aは上記接地側電極28に接続されている 。なお、両放電電極32aと32bとは分割体を合体したときに両端部が相互に 接触して全体がリング形状の放電電極となる。33は塞ぎ板であり、所々に放電 用ガイド穴33aが形成されており、シリコ−ン系の接着材によって固定されて いる。Reference numerals 32a and 32b denote discharge electrodes in the shape of semi-rings, which are housed in the discharge electrode housing portions 20g 2 and 20h 2 formed at the lower ends of the lower walls 20g and 20h of the two divided bodies 20b and 20c, respectively. One electrode 32a is connected to the ground side electrode 28. It should be noted that both the discharge electrodes 32a and 32b are in the form of a ring when the divided bodies are combined and both ends contact each other. Reference numeral 33 is a closing plate, discharge guide holes 33a are formed in places, and they are fixed by a silicone adhesive.

【0020】 29aは収納部23の収納部内壁29に形成したクロス形状の破裂ガイド溝で あり、遮蔽板22bと遮蔽板22cとの間、さらには遮蔽板22cと遮蔽板22 dとの間に位置して上、下2カ所に設けられている。つまり、絶縁カバ−20を 碍子体2の頭部2bに被着した状態において、カバ−内壁、キヤップ金具、カバ −の遮蔽板とにより上、下2つに区画された空間a、bに破裂ガイド溝29a, 29aが位置し、該空間a、bがア−クや上昇した圧力を放出するようになって いる。Reference numeral 29a denotes a cross-shaped rupture guide groove formed on the inner wall 29 of the storage portion 23 of the storage portion 23, and is provided between the shield plate 22b and the shield plate 22c, and further between the shield plate 22c and the shield plate 22d. It is located above and below. That is, when the insulating cover 20 is attached to the head portion 2b of the insulator body 2, it is ruptured into the spaces a and b divided into two upper and lower parts by the inner wall of the cover, the cap fitting, and the cover of the cover. The guide grooves 29a and 29a are located so that the spaces a and b release the arc and the increased pressure.

【0021】 20u、20uは絶縁カバ−20の下部側に位置して設けられた扉開閉式の放 出部であり、ヒンジ25m、25n、25o、25pによりそれぞれ開閉自在に 支持された扉25rと25s、25tと25uが対向して2組、合計4個設けら れていて、一方の扉25rおよび25tの接合部25aと25cに設けた穴25 jが、他方の扉25sおよび25uの接合部25bおよび25dに設けた鉤25 kに差し込まれた状態で各扉25rと25sおよび25tと25uが止着閉鎖さ れている。Reference numerals 20u and 20u denote door opening / closing-type discharge portions provided on the lower side of the insulating cover 20, and a door 25r supported by hinges 25m, 25n, 25o, and 25p so as to be opened and closed, respectively. Two sets of 25s, 25t and 25u are opposed to each other, and a total of four sets are provided. The hole 25j provided in the joint 25a and 25c of one door 25r and 25t is the joint of the other door 25s and 25u. The doors 25r and 25s and 25t and 25u are fixedly closed by being inserted into the hooks 25k provided on 25b and 25d.

【0022】 したがって限流素子26の外絡時、カバ−20の内圧が急激に上昇すると、そ れにより各扉25rと25s、25tと25uの上記の止着関係が外れ、各扉2 5r、25s、25t、25uはヒンジ25m、25n、25o、25pを中心 にして外方に向かって各々が開放し、放圧口が形成されることになる。Therefore, when the internal pressure of the cover 20 suddenly rises when the current limiting element 26 is externally enveloped, the above fastening relationship between the doors 25r and 25s, 25t and 25u is released, and the doors 25r and 25r, 25s, 25t, and 25u are opened outwards centering on the hinges 25m, 25n, 25o, and 25p to form pressure relief ports.

【0023】 なお、上記において各扉25r〜25uの接合部の止着力は絶縁カバ−20の 接合部の止着力より弱くなっていて、カバ−内の圧力が急激に上昇したりすると 直ちに外れ、上記のように放出動作が行われるようになっている。また、上記に おいては4枚の扉が全て解放する方式であるが、この場合4枚の内の2枚25r と25tのみが解放する方式であってもよい。In the above description, the fastening force of the joints of the doors 25r to 25u is weaker than the fastening force of the joints of the insulating cover 20, and when the pressure in the cover suddenly rises, the doors immediately come off. The discharging operation is performed as described above. Further, in the above, the method is such that all four doors are opened, but in this case, only two of the four doors 25r and 25t may be opened.

【0024】 前記充電側電極27に付設した接触片30は、ステンレス板、リン青銅板ある いは真鍮板等の導電材料でかつ弾性を有する金属板により形成されている。そし て該接触片30の内側片部が絶縁カバ−20を碍子体2へ被着したときに、キヤ ップ金具5の側周面5bに対し弾力的に密着して、充電側電極27と充電部のキ ヤップ金具5間を電気的に接続するようになっている。The contact piece 30 attached to the charging-side electrode 27 is formed of a metal plate having a conductive property and elasticity such as a stainless plate, a phosphor bronze plate, or a brass plate. When the inside piece of the contact piece 30 adheres the insulating cover 20 to the insulator body 2, the contact piece 30 elastically adheres to the side peripheral surface 5b of the cap member 5 and the charging side electrode 27. The cap fittings 5 of the charging section are electrically connected to each other.

【0025】 次に本実施例の作用を説明する。 図1のように絶縁カバ−20を取付けることにより、同カバー20の下端の放 電電極32は碍子側のベース金具13との間で放電ギャップGを形成することに なる。そして絶縁電線3を雷サ−ジ等の異常電圧が伝播してくると同サージは、 絶縁電線3−キヤップ金具5−接触片30−充電側電極27−限流素子26−接 地側電極28−放電電極32a(32b)−放電ギヤップG−ベ−ス金具13の 経路で放電され、それに重畳しようとする商用周波の続流が前記放電経路中に介 在する限流素子26により遮断される。これにより続流ア−クによる碍子体2の 偏熱破壊や絶縁電線3の断線事故が未然に防止できる。Next, the operation of this embodiment will be described. By mounting the insulating cover 20 as shown in FIG. 1, the discharge electrode 32 at the lower end of the cover 20 forms a discharge gap G between itself and the base metal fitting 13 on the insulator side. Then, when an abnormal voltage such as lightning surge propagates through the insulated wire 3, the surge is generated: insulated wire 3-cap fitting 5-contact piece 30-charging side electrode 27-current limiting element 26-ground side electrode 28 -Discharge electrode 32a (32b) -Discharge gear G-The base metal 13 is discharged through the path of the commercial frequency and is interrupted by the current limiting element 26 existing in the discharge path. . As a result, it is possible to prevent unbalanced heat destruction of the insulator body 2 and breakage of the insulated wire 3 due to the follow-up arc.

【0026】 また、遮蔽板22a、22b、22c、22dおよび24a、24b、24c 、24dが形成されていることにより、絶縁カバ−20と碍子体2及びキヤップ 金具5と間に形成される空間が、その下端側から上方へ内外方向に対して多段的 に閉鎖される。したがって、絶縁カバ−20の下端から内部へ侵入しようとする 汚損粒子を前記遮蔽板によって確実に遮断することができる。このように汚損粒 子の侵入を阻止できることは、汚損粒子の侵入によってこれが絶縁カバ−20の 内壁面に付着し、その上部と下部間が同電位になり、限流素子26を通過せずに 放電側電極29から直接放電することを防止できる。Since the shielding plates 22a, 22b, 22c, 22d and 24a, 24b, 24c, 24d are formed, the space formed between the insulating cover 20 and the insulator body 2 and the cap fitting 5 is formed. , It is closed from the lower end side upwards in multiple stages inward and outward. Therefore, it is possible to reliably block the dirt particles that try to enter the insulating cover 20 from the lower end thereof by the shielding plate. In this way, it is possible to prevent the ingress of the fouling particles by adhering the fouling particles to the inner wall surface of the insulating cover 20 so that the upper part and the lower part thereof have the same electric potential and do not pass through the current limiting element 26. Direct discharge from the discharge side electrode 29 can be prevented.

【0027】 また、同様に上記絶縁カバ−、キヤップ金具、遮蔽板によって形成される空間 、つまり放出路a、bには開閉扉式の放出部が設けられているため、過大な雷サ −ジの侵入により限流素子にて外絡が発生し、ア−クによりカバ−内の圧力が急 上昇した場合にも、上昇した圧力により先ず破裂ガイド溝29aが破裂し、次い で放出路a、bを経て放出部の扉25r、25s、25t、25uを外側へ押し 開き、カバ−内のア−クや上昇した圧力を速やかにカバ−外に放出(放圧)する 。そのため、ア−クによる焼損或いは急激な圧力上昇に伴うカバ−の破壊や飛散 さらには限流素子、電極などの飛散や落下が防止できる。Similarly, since a space formed by the insulating cover, the cap fitting, and the shielding plate, that is, the discharge paths a and b is provided with an opening / closing door-type discharge part, an excessive lightning surge is caused. Even when the outer current is generated in the current limiting element due to the intrusion of the current and the pressure in the cover suddenly increases due to the arc, the rupture guide groove 29a first ruptures due to the increased pressure, and then the discharge path a. , B, the doors 25r, 25s, 25t, 25u of the discharge part are pushed outward to open the arc in the cover and the increased pressure quickly to the outside of the cover (release pressure). Therefore, it is possible to prevent the cover from being broken or scattered due to burnout due to arc or a sudden pressure rise, and further, scattering or dropping of the current limiting element or the electrode.

【0028】[0028]

【考案の効果】[Effect of device]

本考案は上記の構成からなり、万が一限流素子においてAC続流の遮断が不能 となり、限流素子外絡が発生した場合にも、その外絡時には収納部の収納部内壁 に形成した破裂ガイド溝が先ず破裂して、次いで放出路を経て外絡時の圧力上昇 によって放出部の開閉式が開いてカバ−外へ速やかにそのア−ク並びに圧力を放 出するため、絶縁カバ−自体の飛散、破裂さらにはカバ−内の限流素子、電極の 飛散、落下が防止でき、安全性を一段と高めることができる。 The present invention is configured as described above, and even if the current limiting element cannot interrupt the AC follow-up current and an external current limiting element is generated, a rupture guide formed on the inner wall of the accommodation part of the accommodation part at the time of the external leakage. The groove ruptures first, and then the pressure rises at the time of the external connection via the discharge path, the opening and closing type of the discharge part opens, and the arc and pressure are quickly discharged to the outside of the cover. It is possible to prevent scattering and rupture, and further, scattering and dropping of the current limiting element and the electrode inside the cover, and further improve safety.

【図面の簡単な説明】[Brief description of drawings]

【図1】本考案の実施例を示す保護装置の使用状態を示
す縦断面図。
FIG. 1 is a vertical cross-sectional view showing a usage state of a protective device according to an embodiment of the present invention.

【図2】絶縁カバーの要部を示す斜視図。FIG. 2 is a perspective view showing a main part of an insulating cover.

【図3】解放した状態の絶縁カバーの内面図。FIG. 3 is an inner view of the insulating cover in a released state.

【図4】図3におけるイ−イ断面図。4 is a cross-sectional view taken along the line EE in FIG.

【図5】図3の平面図。5 is a plan view of FIG.

【図6】図3の底面図。6 is a bottom view of FIG.

【図7】図3の中央縦断面図。FIG. 7 is a central longitudinal sectional view of FIG.

【図8】図3の右側面図。FIG. 8 is a right side view of FIG.

【符号の説明】[Explanation of symbols]

2 碍子体 2b 頭部 3 電線 20 絶縁カバ− 26 限流素子 25r、25s、25t、25u 扉 29 収納部内壁 29a 破裂ガイド溝 a、b 放出路 2 Insulator 2b Head 3 Electric wire 20 Insulation cover 26 Current limiting element 25r, 25s, 25t, 25u Door 29 Inner wall of storage part 29a Rupture guide groove a, b Discharge path

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】 碍子体の頭部を被覆する絶縁カバー内に
限流素子を内蔵して、該絶縁カバーを碍子体の頭部に被
着し、その限流素子と碍子体に支持された電線とを電気
的に接続するものにおいて、 限流素子(26)を収納する収納部内壁(29)に破裂
ガイド溝(29a)を形成し、絶縁カバー(20)の一
部には、所定の内圧により絶縁カバー外に開口する扉
(25r〜25u)を設け、上記破裂ガイド溝(29
a)部と扉(25r〜25u)との間を、圧力放出路
(a)(b)で連通したことを特徴とする碍子保護装
置。
1. A current limiting element is built in an insulating cover for covering the head of the insulator, and the insulating cover is attached to the head of the insulator and supported by the current limiting element and the insulator. In the case of electrically connecting with an electric wire, a rupture guide groove (29a) is formed in an inner wall (29) of an accommodating portion for accommodating the current limiting element (26), and a predetermined portion is provided on a part of the insulating cover (20). A door (25r to 25u) that opens to the outside of the insulating cover by internal pressure is provided, and the burst guide groove (29
An insulator protection device characterized in that a portion (a) and the doors (25r to 25u) are communicated with each other through pressure release passages (a) and (b).
JP1992067372U 1992-09-28 1992-09-28 Insulator protection device Expired - Lifetime JP2596306Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1992067372U JP2596306Y2 (en) 1992-09-28 1992-09-28 Insulator protection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1992067372U JP2596306Y2 (en) 1992-09-28 1992-09-28 Insulator protection device

Publications (2)

Publication Number Publication Date
JPH0631035U true JPH0631035U (en) 1994-04-22
JP2596306Y2 JP2596306Y2 (en) 1999-06-14

Family

ID=13343121

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1992067372U Expired - Lifetime JP2596306Y2 (en) 1992-09-28 1992-09-28 Insulator protection device

Country Status (1)

Country Link
JP (1) JP2596306Y2 (en)

Also Published As

Publication number Publication date
JP2596306Y2 (en) 1999-06-14

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