JP2020053645A - Leak current prevention device - Google Patents

Leak current prevention device Download PDF

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JP2020053645A
JP2020053645A JP2018184345A JP2018184345A JP2020053645A JP 2020053645 A JP2020053645 A JP 2020053645A JP 2018184345 A JP2018184345 A JP 2018184345A JP 2018184345 A JP2018184345 A JP 2018184345A JP 2020053645 A JP2020053645 A JP 2020053645A
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lead wire
leakage current
wall
main body
peripheral surface
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JP6535800B1 (en
Inventor
佐藤 智之
Tomoyuki Sato
智之 佐藤
友宏 長嶋
Tomohiro Nagashima
友宏 長嶋
剛 万木
Go Manki
剛 万木
義晴 藤井
Yoshiharu Fujii
義晴 藤井
鈴木 健司
Kenji Suzuki
健司 鈴木
友也 安倍
Tomoya Abe
友也 安倍
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Nichia Corp
Tohoku Electric Power Co Inc
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Nichia Corp
Tohoku Electric Power Co Inc
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Publication of JP2020053645A publication Critical patent/JP2020053645A/en
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Abstract

To provide a leak current prevention device capable of preventing generation of the damage to a lead wire caused by tracking resulting from a leak current, reducing lead wire cost and working cost achieved by reduced replacement frequency of a lead wire and capable of reducing power loss caused by a leak current.SOLUTION: The leak current prevention device includes: a body part 1 mounted on a primary bushing of a transformer; and a lid part 2 fitted on the body part 1 to face the body part. The body part 1 includes a first lead wire insertion part 13. The lid part 2 includes a second lead wire insertion part 22 communicating with the first lead wire insertion part 13. An internal surface of the body part 1 or the lid part 2 has a dry band S, thereby isolating a lead wire surface from the primary bushing.SELECTED DRAWING: Figure 1

Description

本発明は、柱上変圧器のブッシング周辺の漏洩電流を軽減する漏洩電流防止具に関するものである。   The present invention relates to a leakage current prevention device for reducing leakage current around a bushing of a pole transformer.

柱上変圧器周辺においては、漏洩電流が発生し、リード線のトラッキングによる損傷やブッシングの破損の問題がある。特に沿岸部等重汚染地域では、変圧器の一次ブッシングの碍子や該碍子とリード線の接続部付近の表面に付着した、塩分を含んだ雨水や海水、及び土砂等(以下、汚損物という)によって導電路が形成されるため、変圧器一次ブッシングとの接続部分付近にトラッキングによるリード線の損傷被害が集中し、数年単位で定期的にリード線を交換しており、電力ロスの問題だけでなく、危険を伴う高所作業であるリード線交換の手間が発生していた。そこで、ブッシング部での漏洩電流を防止するため、図5に示すような、内部に汚損物の浸入しない領域を設けたポリエチレン製の縦型漏洩電流防止傘が知られている。   Leakage current is generated around the pole transformer, and there is a problem of damage due to tracking of the lead wire and breakage of the bushing. Especially in heavy polluted areas such as coastal areas, rainwater, seawater, earth and sand containing salt attached to the insulators of the primary bushing of the transformer and the surface near the junction between the insulator and the lead wire (hereinafter referred to as polluted matter) Since the conductive path is formed, the damage to the lead wire due to tracking concentrates near the connection with the primary bushing of the transformer, and the lead wire is replaced regularly every several years, so only the problem of power loss Rather, the work involved in replacing lead wires, which is a dangerous work at height, has been required. Therefore, in order to prevent leakage current at the bushing portion, there is known a vertical type leakage current prevention umbrella made of polyethylene, as shown in FIG.

しかしながら、上記縦型漏洩電流防止傘は、略鉛直方向に設置して使用することを前提としているため、略水平方向に突出している柱上変圧器一次ブッシングに取り付けても、漏洩電流防止傘内部に入り込んだ汚損物が排出されないため、漏洩電流を防止することは出来なかった。   However, since the vertical leakage current prevention umbrella is presumed to be installed and used in a substantially vertical direction, even if it is attached to a pole transformer primary bushing that projects substantially horizontally, the inside of the leakage current prevention umbrella is Leakage current could not be prevented because the contaminated material that had entered was not discharged.

本発明は上記課題に鑑みてなされたものであり、その目的とするところは、漏洩電流に起因したトラッキングによるリード線の損傷被害を防止し、リード線の交換頻度低減によるリード線費用及び作業費用の低減、さらには漏洩電流による電力ロスを低減することにある。   The present invention has been made in view of the above problems, and has as its object to prevent damage to a lead wire due to tracking caused by leakage current, and to reduce lead wire replacement frequency and work cost by reducing the frequency of lead wire replacement. And power loss due to leakage current.

本発明のうち請求項1記載の漏洩電流防止具は、変圧器の一次ブッシングに取り付けられる本体部と、該本体部に対向して取り付けられる蓋部とを備え、本体部は、第一リード線挿通部を有し、蓋部は、前記第一リード線挿通部に連通する第二リード線挿通部を有し、本体部または蓋部の内表面にドライバンドを有していることによりリード線表面と一次ブッシングとが絶縁されることを特徴とする。   The leakage current prevention device according to claim 1 of the present invention includes a main body attached to a primary bushing of a transformer, and a lid attached opposite to the main body, wherein the main body includes a first lead wire. The cover has a second lead wire insertion portion communicating with the first lead wire insertion portion, and the lead wire has a dry head on the inner surface of the main body or the cover portion. The surface is insulated from the primary bushing.

本発明のうち請求項2記載の漏洩電流防止具は、本体部は、略椀状の外壁部と、該外壁部の底部から蓋部側へと伸びて形成された第一リード線挿通部を有し、蓋部は、前記外壁部の開口縁に対向する傘部と、前記第一リード線挿通部の先部に固着された固着部と、該固着部と間隔を空けて設けられた略円筒状の遮断壁を有し、第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域内にドライバンドを有することを特徴とする。   In the leakage current prevention device according to claim 2 of the present invention, the main body portion includes a substantially bowl-shaped outer wall portion, and a first lead wire insertion portion formed to extend from the bottom of the outer wall portion to the lid portion side. A lid portion, an umbrella portion facing the opening edge of the outer wall portion, a fixing portion fixed to the tip of the first lead wire insertion portion, and a substantially provided space provided with the fixing portion. It has a cylindrical blocking wall, and has a dryland in a continuous surface region from the outer peripheral surface of the first lead wire insertion portion to the inner peripheral surface of the blocking wall.

本発明のうち請求項3記載の漏洩電流防止具は、遮断壁の内周面には、変圧器側に向けて内径の増大する第一傾斜部が設けられていることを特徴とする。   According to a third aspect of the present invention, there is provided a leakage current preventing device, wherein a first inclined portion whose inner diameter increases toward the transformer is provided on an inner peripheral surface of the blocking wall.

本発明のうち請求項4記載の漏洩電流防止具は、外壁部の内周面には、開口縁に向かって内径の増大する第二傾斜部が設けられており、第一リード線挿通部の外周面には、基端部から中間部に向かって外周径の減少する第三傾斜部が設けられていることを特徴とする。   According to a fourth aspect of the present invention, there is provided the leakage current preventing device, wherein the inner peripheral surface of the outer wall portion is provided with a second inclined portion having an inner diameter that increases toward the opening edge, and is provided with a first lead wire insertion portion. The outer peripheral surface is provided with a third inclined portion whose outer peripheral diameter decreases from the base end toward the intermediate portion.

本発明のうち請求項5記載の漏洩電流防止具は、外壁部の開口縁および傘部の縁部が、互いに離反する方向に反り返っていることを特徴とする。   The leakage current preventer according to claim 5 of the present invention is characterized in that the opening edge of the outer wall and the edge of the umbrella are warped in directions away from each other.

本発明のうち請求項6記載の漏洩電流防止具は、傘部の外径が、前記外壁部の外径よりも大きいことを特徴とする。   The leakage current preventer according to claim 6 of the present invention is characterized in that the outer diameter of the umbrella portion is larger than the outer diameter of the outer wall portion.

請求項1記載の発明によれば、本体部または蓋部の内表面に、漏洩電流防止具外部から汚損物が入り込み難く乾燥状態を保ちやすい領域(以下、ドライバンドという)を有していることで、リード線表面と一次ブッシングとが絶縁され(すなわち漏洩電流の経路が遮断され)、トラッキングによるリード線の損傷被害を防止することができるので、リード線の劣化を防げ、リード線の交換頻度低減によるリード線費用及び作業費用を低減でき、さらには漏洩電流による電力ロスを低減できる。   According to the first aspect of the present invention, the inner surface of the main body or the lid has an area (hereinafter referred to as dryland) in which it is difficult for contaminants to enter from the outside of the leakage current preventer and the dry state is easily maintained. As a result, the surface of the lead wire is insulated from the primary bushing (that is, the path of the leakage current is interrupted), and damage to the lead wire due to tracking can be prevented. The lead wire cost and work cost can be reduced due to the reduction, and power loss due to leakage current can be reduced.

請求項2記載の発明によれば、本体部が、略椀状の外壁部と、該外壁部の底部から蓋部側へと伸びて形成された第一リード線挿通部を有し、蓋部が、前記外壁部の開口縁に対向する傘部と、前記第一リード線挿通部の先部に固着された固着部と、該固着部と間隔を空けて設けられた略円筒状の遮断壁を有し、本体部の第一リード線挿通部と蓋部の固着部とで固着、一体化された該漏洩電流防止具の内部の、第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域内にドライバンドが形成されることで、リード線表面と一次ブッシングとが絶縁され(すなわち漏洩電流の経路が遮断され)、トラッキングによるリード線の損傷被害を防止することができる。また、本体部の外壁部の開口縁と傘部が対向していることで、汚損物が外壁部および傘部の内部へと容易に入り込むことを防げ、ドライバンドの乾燥状態をより長期的に保つことができる。   According to the second aspect of the present invention, the main body has the substantially bowl-shaped outer wall portion and the first lead wire insertion portion formed to extend from the bottom of the outer wall portion to the lid portion side. An umbrella portion facing the opening edge of the outer wall portion, a fixing portion fixed to the tip of the first lead wire insertion portion, and a substantially cylindrical blocking wall provided at an interval from the fixing portion. The first lead wire insertion portion of the main body portion is fixed to the fixing portion of the lid portion, and the inside of the integrated leakage current prevention device, from the outer peripheral surface of the first lead wire insertion portion to the inside of the blocking wall. The formation of the dryland in a continuous surface area extending over the peripheral surface insulates the lead wire surface from the primary bushing (that is, cuts off the leakage current path) and prevents damage to the lead wire due to tracking. Can be. In addition, since the opening edge of the outer wall of the main body and the umbrella face each other, it is possible to prevent dirt from easily entering the outer wall and the inside of the umbrella, and to keep the dry state of the dryland for a longer period of time. Can be kept.

請求項3記載の発明によれば、遮断壁の内周面に、変圧器側に向けて内径の増大する第一傾斜部が設けられていることで、漏洩電流防止具内部に汚損物が入り込んだとしても、第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域に付着した汚損物は重力により下方へと流れて該領域外へと排出されるため、ドライバンドの乾燥状態がより長期的に保たれる。   According to the third aspect of the present invention, the first inclined portion whose inner diameter increases toward the transformer is provided on the inner peripheral surface of the blocking wall, so that contaminants enter the leakage current prevention device. Even so, the contaminants adhering to the continuous surface region from the outer peripheral surface of the first lead wire insertion portion to the inner peripheral surface of the blocking wall flow downward due to gravity and are discharged out of the region. Is kept for a longer period of time.

請求項4記載の発明によれば、漏洩電流防止具内部に汚損物が入り込んだとしても、外壁部の内周面に、開口縁に向かって内径の増大する第二傾斜部が設けられているので、外壁部の内周面に付着した汚損物は重力により内周面を伝って下方へと流れて外壁部の下端部から排出されるため、汚損物が第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域へ浸入し難くなり、ドライバンドの乾燥状態がより長期的に保たれる。また、第一リード線挿通部の外周面に、基端部から中間部に向かって外周径の減少する第三傾斜部が設けられていることで、第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域に付着した汚損物が重力により下方へと流れることで該領域外へと排出されるため、ドライバンドの乾燥状態がより長期的に保たれる。   According to the fourth aspect of the present invention, the second inclined portion whose inner diameter increases toward the opening edge is provided on the inner peripheral surface of the outer wall portion even if contaminants enter the inside of the leakage current prevention device. Therefore, the contaminants adhering to the inner peripheral surface of the outer wall portion flow down the inner peripheral surface due to gravity and are discharged from the lower end portion of the outer wall portion, so that the contaminants are removed from the outer peripheral surface of the first lead wire insertion portion. To the inner peripheral surface of the blocking wall, it is difficult to penetrate into a continuous surface region, and the dry state of the dryland is maintained for a longer period. Further, the outer peripheral surface of the first lead wire insertion portion is provided with a third inclined portion whose outer diameter decreases from the base end portion toward the intermediate portion, so that the outer peripheral surface of the first lead wire insertion portion is blocked. Since the contaminants adhering to the continuous surface area over the inner peripheral surface of the wall flow downward due to gravity and are discharged out of the area, the dry state of the dryland is maintained for a longer period of time.

請求項5記載の発明によれば、外壁部の開口縁および傘部の縁部が互いに離反する方向に反り返っていることで、本体部と蓋部それぞれの下端から滴下した水滴同士の交わりが抑制されるので、水滴の交わり箇所が導電路となることによる漏洩電流の発生を防止することが可能である。   According to the invention as set forth in claim 5, since the opening edge of the outer wall portion and the edge portion of the umbrella portion are warped in directions away from each other, the intersection of water droplets dropped from the lower ends of the main body portion and the lid portion is suppressed. Therefore, it is possible to prevent the occurrence of leakage current due to the intersection of the water droplets serving as a conductive path.

請求項6記載の発明によれば、傘部の外径が前記外壁部の外径よりも大きいので、汚損物が外壁部および傘部の内部へとより入り込み難くなり、ドライバンドの乾燥状態をより長期的に保つことができる。   According to the invention as set forth in claim 6, since the outer diameter of the umbrella portion is larger than the outer diameter of the outer wall portion, it becomes more difficult for dirt to enter the outer wall portion and the inside of the umbrella portion. Can be kept longer.

漏洩電流防止具を柱上変圧器一次ブッシングに取り付けた状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which attached the leakage current prevention tool to the pole transformer primary bushing. 漏洩電流防止具の斜視図である。It is a perspective view of a leakage current prevention tool. 漏洩電流防止具の縦断面図である。It is a longitudinal cross-sectional view of a leakage current prevention tool. 汚損物の流れる経路を示す概略図である。It is the schematic which shows the path | route which a contaminated material flows. 従来の縦型漏洩電流防止傘の側面図及び断面図である。It is the side view and sectional view of the conventional vertical leakage current prevention umbrella.

以下、本発明の実施の形態を図面に基づいて説明する。以下の好ましい実施形態の説明は、本質的に例示に過ぎず、本発明、その適用物あるいはその用途を制限することを意図するものではない。
ここでは、本発明の漏洩電流防止具が柱上変圧器の一次ブッシングの磁器製の碍子31に取り付けられる場合を示す。なお、以下において前後とは、図1における右及び左方向とする。本実施形態の漏洩電流防止具は、図1乃至図4に示すように、前後方向に対向する本体部1及び蓋部2から構成されており、本体部1及び蓋部2を構成する各部はそれぞれ、挿通されるリード線32を中心とする同心円状の対称形をなしている。なお、本体部1及び蓋部2の材質については、例えばシリコーンゴム等の撥水性樹脂で形成されていることが望ましい。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its applications, or its uses.
Here, a case is shown in which the leakage current prevention device of the present invention is attached to a porcelain insulator 31 of a primary bushing of a pole transformer. In the following, the front and rear are the right and left directions in FIG. As shown in FIGS. 1 to 4, the leakage current prevention device of the present embodiment includes a main body 1 and a lid 2 facing each other in the front-rear direction. Each has a concentric symmetrical shape centered on the lead wire 32 to be inserted. The material of the main body 1 and the lid 2 is desirably formed of a water-repellent resin such as silicone rubber.

漏洩電流防止具の本体部1は、図1乃至図4に示すように、碍子31に取り付けられる略二重円筒状の底部12と、底部12の外周面に連結されている略椀状の外壁部11と、底部12の略中心部から蓋部2方向に突出し、リード線32が挿通される第一リード線挿通部13を備えている。底部12は、外壁部11の基部11aの端部に連結された第一円筒部12aと、第一円筒部12aの内周側に位置する第二円筒部12cと、両者の前端部を略鉛直方向に連結する連結部12dにより構成されている。第一円筒部12aの内周面と第二円筒部12cとの隙間12bが碍子31の外管31aの前端部と嵌合することにより、本体部1は碍子31に固定される。外壁部11は、底部12の外周面から延出した基部11aと、中間部11bと、縁部(開口縁)11cとで構成されていて、基部11a及び中間部11bは、それぞれ前側へ向かって内径が増大しているため、外壁部11の内周面には水平面に対して傾斜した第二傾斜部11dが前後方向に亘って形成されている。縁部11cは、後述の蓋部2の傘部21の縁部21bと離反する方向に反り返った形状である。第一リード線挿通部13は、基部13aと、先端部13bとで構成されており、内部には長手方向に亘ってリード線32の挿通孔13dを有している。基部13aは、底部12に連結した端部から先端部13bに向かって外径が小さくなっており、基部13aの外周面には水平面に対し傾斜した第三傾斜部13cが前後方向に亘って形成されている。先端部13bの前側端部は、外壁部11の縁部11cよりも前側に位置していて、図1あるいは図3に示すように、先端部13bが後述の蓋部2の環状部(固着部)23に嵌合することで本体部1と蓋部2が固着される。そのため、先端部13bの形状は、環状部23との嵌合が妨げられないよう、外径の変化しない円筒状、あるいは先端方向に向かって外径が小さくなる形状であることが好ましい。また、先端部13bの内径は、リード線32への取り付け後にリード線32との隙間が生じない程度の寸法であることが望ましい。   As shown in FIGS. 1 to 4, the main body 1 of the leakage current prevention device has a substantially double cylindrical bottom 12 attached to the insulator 31 and a substantially bowl-shaped outer wall connected to the outer peripheral surface of the bottom 12. A portion 11 and a first lead wire insertion portion 13 protruding from a substantially central portion of the bottom portion 12 in the direction of the lid portion 2 and through which a lead wire 32 is inserted are provided. The bottom portion 12 has a first cylindrical portion 12a connected to an end portion of the base portion 11a of the outer wall portion 11, a second cylindrical portion 12c located on the inner peripheral side of the first cylindrical portion 12a, and a front end portion of both of them being substantially vertical. It is constituted by a connecting portion 12d that connects in the directions. The main body 1 is fixed to the insulator 31 by fitting the gap 12b between the inner peripheral surface of the first cylindrical portion 12a and the second cylindrical portion 12c with the front end of the outer tube 31a of the insulator 31. The outer wall portion 11 includes a base portion 11a extending from the outer peripheral surface of the bottom portion 12, an intermediate portion 11b, and an edge portion (opening edge) 11c. The base portion 11a and the intermediate portion 11b are respectively directed toward the front side. Since the inner diameter is increased, a second inclined portion 11d that is inclined with respect to a horizontal plane is formed on the inner peripheral surface of the outer wall portion 11 in the front-rear direction. The edge 11c has a shape that warps in a direction away from the edge 21b of the umbrella 21 of the lid 2 described later. The first lead wire insertion portion 13 includes a base portion 13a and a distal end portion 13b, and has an insertion hole 13d for the lead wire 32 in the longitudinal direction inside. The outer diameter of the base portion 13a decreases from the end portion connected to the bottom portion 12 to the tip portion 13b, and a third inclined portion 13c that is inclined with respect to a horizontal plane is formed on the outer peripheral surface of the base portion 13a in the front-rear direction. Have been. The front end of the tip portion 13b is located on the front side of the edge portion 11c of the outer wall portion 11, and as shown in FIG. 1 or FIG. ) 23, the main body 1 and the lid 2 are fixed. Therefore, the shape of the distal end portion 13b is preferably a cylindrical shape whose outer diameter does not change or a shape whose outer diameter decreases toward the distal end so that the fitting to the annular portion 23 is not hindered. Further, it is desirable that the inner diameter of the distal end portion 13b is a dimension that does not cause a gap with the lead wire 32 after being attached to the lead wire 32.

蓋部2は、図1乃至図4に示すように、本体部1の外壁部11に対向する無底略円錐状の傘部21と、傘部21前面の略中心部から前方へ突出した略円筒形の第二リード線挿通部22と、傘部21の後面から後方へと伸びて設けられ、本体部1の第一リード線挿通部13の先端部13bに嵌合する略円筒形の環状部(固着部)23と、環状部23の外周側に間隔をおいて傘部21の後面から後方へ伸びて形成された略円筒形の遮断壁24から構成されている。傘部21の縁部21bと外壁部11の縁部11cは隙間Gを空けて対向していて、傘部21の外径は本体部1の外壁部11の縁部11cの外径よりも大きく、傘部21の縁部21bは、縁部11cと離反する方向に反り返った形状である。隙間Gの前後方向の径は、汚損物が外壁部11および傘部21の内部へと容易に入り込むことを防げる程度に狭く、かつ、縁部11cと縁部21bとからそれぞれ滴下する水滴が交わって縁部11cと縁部21b間に導電路を形成してしまうことがない程度に広く形成されている。第二リード線挿通部22は、その内部に長手方向に亘ってリード線32が挿通される挿通孔22aを有していて、その内径は、リード線32のへの取り付け後にリード線32との隙間が生じない程度の寸法であることが望ましい。図1あるいは図3に示すように、環状部23の内周面は、本体部1の第一リード線挿通部13の先端部13bの外形に略相似した形状であり、先端部13bと環状部23とが嵌合することで本体部1と蓋部2が固着される。さらに、環状部23の後端の位置は、先端部13bの後端の位置よりも、第三傾斜部13cを覆ってしまわない程度にやや後方に設けておくことが、本体部1と蓋部2の接合強度を保持する目的において好ましい。また環状部23の外周面は、外径が前方へ向けて増大する傾斜面であってもよい。環状部23の外周側に間隔をおいて設けられた略円筒状の遮断壁24は、本体部1と蓋部2を組み合わせた際に、遮断壁24の後端が本体部1の内部の、概ね外壁部11の前後方向中心付近にまで入り込む形状であって、遮断壁24の後端部の外径は底部12の第一円筒部12aと略同じであり、遮断壁24の後端部と第一円筒部12aの前端部は互いに間隔を空けて対向している。遮断壁24の内径は後方に向かって増大しており、遮断壁24の内周面には、水平面に対して傾斜した第一傾斜部24aが前後方向に亘って形成されている。   As shown in FIGS. 1 to 4, the lid 2 has a substantially conical bottomless umbrella 21 facing the outer wall 11 of the main body 1, and a substantially protruding front from a substantially central portion of the front surface of the umbrella 21. A cylindrical second lead wire insertion portion 22 and a substantially cylindrical annular portion that is provided to extend rearward from the rear surface of the umbrella portion 21 and that fits into the distal end portion 13 b of the first lead wire insertion portion 13 of the main body 1. A portion (fixed portion) 23 and a substantially cylindrical blocking wall 24 extending rearward from the rear surface of the umbrella portion 21 at an interval on the outer peripheral side of the annular portion 23. The edge 21b of the umbrella 21 and the edge 11c of the outer wall 11 face each other with a gap G therebetween, and the outer diameter of the umbrella 21 is larger than the outer diameter of the edge 11c of the outer wall 11 of the main body 1. The edge 21b of the umbrella 21 has a shape that warps in a direction away from the edge 11c. The diameter of the gap G in the front-rear direction is small enough to prevent the contaminated material from easily entering the inside of the outer wall portion 11 and the umbrella portion 21, and water drops dripping from the edge portion 11 c and the edge portion 21 b intersect. Thus, it is formed so wide that a conductive path is not formed between the edge 11c and the edge 21b. The second lead wire insertion portion 22 has an insertion hole 22a through which the lead wire 32 is inserted in the longitudinal direction, and the inner diameter of the second lead wire insertion portion 22 is different from that of the lead wire 32 after being attached to the lead wire 32. It is desirable that the dimensions be such that no gap is formed. As shown in FIG. 1 or FIG. 3, the inner peripheral surface of the annular portion 23 has a shape substantially similar to the outer shape of the distal end portion 13 b of the first lead wire insertion portion 13 of the main body portion 1. The main body 1 and the lid 2 are fixed to each other by fitting. Further, the position of the rear end of the annular portion 23 may be provided slightly behind the position of the rear end of the front end portion 13b so as not to cover the third inclined portion 13c. 2 is preferable for the purpose of maintaining the bonding strength. Further, the outer peripheral surface of the annular portion 23 may be a slope whose outer diameter increases toward the front. When the main body 1 and the cover 2 are combined, the rear end of the wall 24 is provided inside the main body 1. The outer wall 11 has a shape that generally enters the vicinity of the center of the outer wall 11 in the front-rear direction. The outer diameter of the rear end of the blocking wall 24 is substantially the same as the first cylindrical portion 12a of the bottom 12, and The front ends of the first cylindrical portions 12a face each other with a space therebetween. The inner diameter of the blocking wall 24 increases rearward, and a first inclined portion 24a that is inclined with respect to a horizontal plane is formed on the inner peripheral surface of the blocking wall 24 in the front-rear direction.

次に、本発明の漏洩電流防止具の施工方法を、図1に示す柱上変圧器から略水平に突出した一次ブッシングの碍子31に漏洩電流防止具を施工した場合に基づいて説明する。
まず、本体部1の第一リード線挿通部13の先端部13bを蓋部2の環状部23に挿入することで、本体部1と蓋部2とを一体化させる。そして、連通した第一リード線挿通部13と第二リード線挿通部22に対し、挿通孔13d側から挿通孔22a側へとリード線32の先端を通すことでリード線32を挿通し、その後、碍子31に漏洩電流防止具の本体部1の底部12を押し付け、第一円筒部12aの内周面と第二円筒部12cとの隙間12bと、碍子31の外管31aの前端部とを嵌合させることで漏洩電流防止具を碍子31に固定する。なおこのとき、第一円筒部12aの内周面に全周に亘って絶縁性防水パテを予め塗布しておくことで、第一円筒部12aと碍子31の外管31aを隙間無く密着させることが可能となり、両者間への汚損物の浸入を防げる。
Next, the method of applying the leakage current prevention device of the present invention will be described based on the case where the leakage current prevention device is applied to the insulator 31 of the primary bushing that projects substantially horizontally from the pole transformer shown in FIG.
First, the main body 1 and the lid 2 are integrated by inserting the distal end 13 b of the first lead wire insertion portion 13 of the main body 1 into the annular portion 23 of the lid 2. Then, the lead wire 32 is inserted into the first lead wire insertion portion 13 and the second lead wire insertion portion 22 by passing the leading end of the lead wire 32 from the insertion hole 13d side to the insertion hole 22a side. Then, the bottom portion 12 of the main body 1 of the leakage current preventing device is pressed against the insulator 31 to form a gap 12b between the inner peripheral surface of the first cylindrical portion 12a and the second cylindrical portion 12c and the front end of the outer tube 31a of the insulator 31. The leakage current preventing device is fixed to the insulator 31 by being fitted. At this time, the first cylindrical portion 12a and the outer tube 31a of the insulator 31 are brought into close contact with each other by applying an insulating waterproof putty on the entire inner peripheral surface of the first cylindrical portion 12a in advance. It is possible to prevent infiltration of contaminants between the two.

また、上記の手順の他、本体部1と蓋部2とが分離した状態のままで、まず、本体部1の第一リード線挿通部13に図1の後側からリード線32を通し、その後、本体部1の底部12を碍子31先端に押し付け密着させてから、蓋部2の第二リード線挿通部22に図1の後側からリード線32を通し、その後、本体部1の第一リード線挿通部13の先端部13bを蓋部2の環状部23に挿入して嵌合させ、漏洩電流防止具として一体化させることも可能である。   In addition, in addition to the above procedure, while the main body 1 and the lid 2 are kept separated, first, the lead wire 32 is passed through the first lead wire insertion portion 13 of the main body 1 from the rear side of FIG. Thereafter, the bottom portion 12 of the main body 1 is pressed against and adhered to the tip of the insulator 31, and then the lead wire 32 is passed through the second lead wire insertion portion 22 of the lid 2 from the rear side of FIG. It is also possible to insert and fit the distal end portion 13b of the one lead wire insertion portion 13 into the annular portion 23 of the lid portion 2 so as to be integrated as a leakage current prevention tool.

そして、リード線32が挿通された漏洩電流防止具が碍子31に固定された後、第二リード線挿通部22の前端部とリード線32との境界の隙間から漏洩電流防止具内部への汚損物の侵入を防ぐため、該境界箇所の周辺に自己融着テープ等を巻き付け、隙間を塞ぐ。以上で漏洩電流防止具の碍子31への取り付けが完了する。   Then, after the leakage current prevention tool into which the lead wire 32 has been inserted is fixed to the insulator 31, contamination inside the leakage current prevention tool from the gap at the boundary between the front end of the second lead wire insertion portion 22 and the lead wire 32. In order to prevent entry of an object, a self-sealing tape or the like is wrapped around the boundary to close the gap. Thus, the attachment of the leakage current prevention device to the insulator 31 is completed.

次いで、本発明の漏洩電流防止具による作用効果を説明する。本発明の漏洩電流防止具を図1のように柱上変圧器一次ブッシングの碍子31に取り付けると、本体部1の外壁部11の縁部11cと傘部21の縁部21bが隙間Gを空けて対向していることにより、汚損物が短絡防止具の内部(外壁部11および傘部21の内部)に入り込み難くなっている。また、遮断壁24の後端が本体部1の内部の、概ね外壁部11の前後方向中心付近にまで入り込む形状であり、第一〜第三傾斜部が設けられていることで、円周方向の全周に亘って汚損物が非常に付着し難い表面領域(以下、ドライバンドSとする)が生じる。ドライバンドSは、遮断壁24の内周面と、環状部23の外周面と、それらを繋いでいる傘部21の後面21a、そして第一リード線挿通部13の基部13aの外周面のうち、遮断壁の後端よりも前側の部分により形成されている。外壁部11の縁部11cと傘部21の縁部21b間との間から汚損物が漏洩電流防止具内に入り込んだとしても、汚損物は、図4に示す経路を経て漏洩電流防止具内を流れ落ち、下方へと排出される。詳しくは、本体部1の第一リード線挿通部13外周面に設けた第三傾斜部13c、蓋部2の遮断壁24内周面に設けた第一傾斜部24a、本体部1の外壁部11内周面に設けた第二傾斜部11dによって、内部に入り込んだ汚損物が重力により漏洩電流防止具の外部に容易に排出される。
このようにしてドライバンドSが形成されるため、碍子31の外管31aの外周面から、第二リード線挿通部22の先端部から露出するリード線32の表面までの連続した表面経路に、汚損物の付着し難い帯状領域であるドライバンドSが介在することとなり、その結果碍子31とリード線32表面の間における導電路の形成が防止され(すなわち、両者が絶縁され)、漏洩電流に起因するトラッキングによるリード線32の損傷被害が防止される。さらに蓋部2の傘部21の外径を本体部1の外壁部11の外径よりも大きくすることで、漏洩電流防止具内部への汚損物の吹き込みを防止できる。以上の構成により、ドライバンドSの乾燥状態を長期にわたって維持することが可能となり、漏洩電流の発生を長期にわたって防止することができるので、トラッキングによるリード線32の損傷を防げ、リード線32の交換頻度低減によるリード線32費用及び作業費用を低減でき、さらには漏洩電流による電力ロスを低減できる。
Next, the function and effect of the leakage current prevention device of the present invention will be described. When the leakage current prevention device of the present invention is attached to the insulator 31 of the primary bushing primary bushing as shown in FIG. 1, the edge 11c of the outer wall 11 of the main body 1 and the edge 21b of the umbrella 21 form a gap G. , It is difficult for the contaminated material to enter the inside of the short-circuit preventing device (the inside of the outer wall portion 11 and the umbrella portion 21). Further, the rear end of the blocking wall 24 is shaped so as to penetrate into the inside of the main body 1, substantially near the center in the front-rear direction of the outer wall portion 11, and the first to third inclined portions are provided so that the circumferential direction is provided. A surface area (hereinafter, referred to as dry land S) on which contaminants are extremely unlikely to adhere is generated over the entire circumference of. The dryland S is formed of an inner peripheral surface of the blocking wall 24, an outer peripheral surface of the annular portion 23, a rear surface 21 a of the umbrella 21 connecting them, and an outer peripheral surface of the base 13 a of the first lead wire insertion portion 13. , Formed by a portion on the front side of the rear end of the blocking wall. Even if the contaminant enters the leakage current preventive device from between the edge 11c of the outer wall portion 11 and the edge portion 21b of the umbrella portion 21, the contaminant remains in the leakage current preventive device via the path shown in FIG. And is discharged downward. More specifically, a third inclined portion 13c provided on the outer peripheral surface of the first lead wire insertion portion 13 of the main body portion 1, a first inclined portion 24a provided on the inner peripheral surface of the blocking wall 24 of the lid portion 2, and an outer wall portion of the main body portion 1 Due to the second inclined portion 11d provided on the inner peripheral surface of the eleventh, the contaminated matter that has entered inside can be easily discharged to the outside of the leakage current preventing device by gravity.
Since the dryland S is formed in this manner, a continuous surface path from the outer peripheral surface of the outer tube 31a of the insulator 31 to the surface of the lead wire 32 exposed from the distal end of the second lead wire insertion portion 22 is formed. Dry band S, which is a belt-like region to which dirt does not easily adhere, is interposed. As a result, formation of a conductive path between insulator 31 and the surface of lead wire 32 is prevented (ie, both are insulated), and leakage current is reduced. The damage and damage of the lead wire 32 due to the tracking caused thereby can be prevented. Further, by making the outer diameter of the umbrella portion 21 of the lid portion 2 larger than the outer diameter of the outer wall portion 11 of the main body portion 1, it is possible to prevent the inflow of contaminants into the leakage current prevention device. With the above configuration, the dry state of the dryland S can be maintained for a long period of time, and the generation of leakage current can be prevented for a long period of time. Therefore, damage to the lead wire 32 due to tracking can be prevented, and replacement of the lead wire 32 can be prevented. It is possible to reduce the cost of the lead wire 32 and the operation cost due to the reduction in frequency, and it is also possible to reduce power loss due to leakage current.

また、本体部1の外壁部11の下端部から滴下する水滴と、蓋部2の傘部21の下端部から滴下する水滴が交わると、その部分が導電路となり漏洩電流が発生する虞があるが、本発明の漏洩電流防止具は、本体部1の外壁部11の縁部11cと蓋部2の傘部21の縁部21bが、それぞれ離反する方向に反り返った形状であることにより、本体部1の外壁部11の内周面、外周面を滑落してきた水分は、図4に示すように外壁部11の下端部から後側を滴下することとなり、また、蓋部2の傘部21の内周面及び外周面を滑落してきた水分は、傘部21の下端部から前側を滴下することになり、本体部1から滴下する水滴と蓋部2から滴下する水滴が交わることを防止することが可能となり、水滴の交わりに起因する漏洩電流を防止することができる。   Further, when a water drop dripping from the lower end of the outer wall 11 of the main body 1 and a water drop dripping from the lower end of the umbrella 21 of the lid 2 intersect, the part becomes a conductive path and a leakage current may be generated. However, the leakage current prevention device of the present invention has a structure in which the edge portion 11c of the outer wall portion 11 of the main body portion 1 and the edge portion 21b of the umbrella portion 21 of the lid portion 2 are curved in the directions away from each other. Moisture that has slipped down on the inner and outer peripheral surfaces of the outer wall 11 of the part 1 will be dripped from the lower end of the outer wall 11 to the rear as shown in FIG. The water that has slid down the inner and outer peripheral surfaces of the umbrella will drop on the front side from the lower end of the umbrella portion 21, preventing water droplets dropped from the main body portion 1 from intersecting with water droplets dropped from the lid portion 2. To prevent leakage currents due to the intersection of water droplets It can be.

さらに、漏洩電流防止具の本体部1及び蓋部2を撥水性樹脂で形成してあることで、水接触角が大きい撥水性樹脂の表面に付着した水分は、水玉状の液滴となり滑落しやすくなることから、漏洩電流防止具内部に入り込んだ水分の外部への排出が促進され、さらに長期にわたってドライバンドSの乾燥状態を保つことが可能となる。また、シリコーンゴムは、表面上で水玉状の液滴となった水分が、樹脂表面に既に付着していた汚れを巻き込みながら(洗浄しながら)流れ落ちる性質があるため、本体部1及び蓋部2の各部への汚損物の付着がより抑制されるので、導電路が形成されにくく、より長期間にわたりトラッキングを防止できる。   Furthermore, since the main body 1 and the lid 2 of the leakage current prevention device are formed of a water-repellent resin, the water adhering to the surface of the water-repellent resin having a large water contact angle becomes a polka dot droplet and slides down. This facilitates the discharge of moisture that has entered the inside of the leakage current prevention device to the outside, and makes it possible to maintain the dry state of the dryland S for a long period of time. In addition, silicone rubber has a property that water that has been formed as polka dots on the surface flows down while entraining (washing) dirt that has already adhered to the resin surface. Since the adhesion of the contaminants to the respective parts is further suppressed, a conductive path is hardly formed, and tracking can be prevented for a longer period.

本発明は、上記の実施形態に限らず本発明の要旨を逸脱しない範囲で変形可能であり、例えば材質はシリコーンゴム以外の撥水性樹脂や、撥水性コーティング等の表面処理を施した撥水性樹脂以外の材質を採用することも可能である。また、本体部及び蓋部を、それぞれリード線を中心とした一対の半割り形状の部材で形成すれば、施工時に各リード線挿通部にリード線の先端部を挿通しなくとも、一対の半割本体部及び半割蓋部でリード線を挟み込んだのち半割部材同士を固定するだけで簡便に取り付け可能であり、作業性に優れる。さらに上記のような構成とすることで、柱状変圧器が既設であり、リード線の端部を取り外すことのできない場合においても漏洩電流防止具を取り付け可能である。また、固着部の形状は環状でなくともよく、例えば複数の板状部材で第一リード線挿通部を挟み込むことで固着するものであってもよいし、本体部と蓋部とが一体形成されていてもよい。また、ドライバンドは、汚損物による導電路形成を防止できれば、バンド状(帯状)である必要は無く、ライン状(線状)等、各種形状も可能である。そして、各部の形状、サイズ、寸法比等も適用する変圧器やケーブルの種類に応じて適宜変更可能である。   The present invention is not limited to the above embodiments, and can be modified without departing from the spirit of the present invention. For example, the material is a water-repellent resin other than silicone rubber, or a water-repellent resin subjected to a surface treatment such as a water-repellent coating. Other materials can be used. In addition, if the main body and the lid are each formed of a pair of half-shaped members centered on the lead wire, the pair of half-split portions can be inserted without inserting the lead wire tip into each lead wire insertion portion at the time of construction. After the lead wire is sandwiched between the split main body portion and the half split lid portion, it can be easily attached simply by fixing the half split members, and is excellent in workability. Further, with the above-described configuration, the leakage current prevention device can be attached even when the columnar transformer is already provided and the end of the lead wire cannot be removed. Further, the shape of the fixing portion is not limited to an annular shape, and may be, for example, fixed by sandwiching the first lead wire insertion portion between a plurality of plate members, or the main body portion and the lid portion are integrally formed. May be. The dryland does not need to be band-shaped (band-shaped) as long as it can prevent formation of conductive paths due to contaminants, and various shapes such as line-shaped (linear) can be used. The shape, size, dimensional ratio, and the like of each part can be appropriately changed according to the type of the transformer or cable to be applied.

1 本体部
11 外壁部
11c 縁部(開口縁)
11d 第二傾斜部
12 底部
13 第一リード線挿通部
13c 第三傾斜部
2 蓋部
21 傘部
22 第二リード線挿通部
23 環状部(固着部)
24 遮断壁
24a 第一傾斜部
31 碍子
32 リード線
S ドライバンド
1 Body
11 outer wall
11c Edge (opening edge)
11d second slope
12 bottom
13 First lead wire insertion part
13c Third slope
2 Lid
21 Umbrella Club
22 Second lead wire insertion part
23 Annular part (fixed part)
24 Blocking wall
24a first slope
31 Insulator
32 lead wires
S Dryland

本発明は、柱上変圧器のブッシング周辺の漏洩電流を軽減する漏洩電流防止具に関するものである。   The present invention relates to a leakage current prevention device for reducing leakage current around a bushing of a pole transformer.

柱上変圧器周辺においては、漏洩電流が発生し、リード線のトラッキングによる損傷やブッシングの破損の問題がある。特に沿岸部等重汚染地域では、変圧器の一次ブッシングの碍子や該碍子とリード線の接続部付近の表面に付着した、塩分を含んだ雨水や海水、及び土砂等(以下、汚損物という)によって導電路が形成されるため、変圧器一次ブッシングとの接続部分付近にトラッキングによるリード線の損傷被害が集中し、数年単位で定期的にリード線を交換しており、電力ロスの問題だけでなく、危険を伴う高所作業であるリード線交換の手間が発生していた。そこで、ブッシング部での漏洩電流を防止するため、図5に示すような、内部に汚損物の浸入しない領域を設けたポリエチレン製の縦型漏洩電流防止傘が知られている。   Leakage current is generated around the pole transformer, and there is a problem of damage due to tracking of the lead wire and breakage of the bushing. Especially in heavy polluted areas such as coastal areas, rainwater, seawater, earth and sand containing salt attached to the insulators of the primary bushing of the transformer and the surface near the junction between the insulator and the lead wire (hereinafter referred to as polluted matter) Since the conductive path is formed, the damage to the lead wire due to tracking concentrates near the connection with the primary bushing of the transformer, and the lead wire is replaced regularly every several years, so only the problem of power loss Rather, the work involved in replacing lead wires, which is a dangerous work at height, has been required. Therefore, in order to prevent leakage current at the bushing portion, there is known a vertical type leakage current prevention umbrella made of polyethylene, as shown in FIG.

しかしながら、上記縦型漏洩電流防止傘は、略鉛直方向に設置して使用することを前提としているため、略水平方向に突出している柱上変圧器一次ブッシングに取り付けても、漏洩電流防止傘内部に入り込んだ汚損物が排出されないため、漏洩電流を防止することは出来なかった。   However, since the vertical leakage current prevention umbrella is presumed to be installed and used in a substantially vertical direction, even if it is attached to a pole transformer primary bushing that projects substantially horizontally, the inside of the leakage current prevention umbrella is Leakage current could not be prevented because the contaminated material that had entered was not discharged.

本発明は上記課題に鑑みてなされたものであり、その目的とするところは、漏洩電流に起因したトラッキングによるリード線の損傷被害を防止し、リード線の交換頻度低減によるリード線費用及び作業費用の低減、さらには漏洩電流による電力ロスを低減することにある。   The present invention has been made in view of the above problems, and has as its object to prevent damage to a lead wire due to tracking caused by leakage current, and to reduce lead wire replacement frequency and work cost by reducing the frequency of lead wire replacement. And power loss due to leakage current.

本発明のうち請求項1記載の漏洩電流防止具は、変圧器の一次ブッシングに取り付けられる本体部と、該本体部に対向して取り付けられる蓋部とを備え、本体部は、略椀状の外壁部と、該外壁部の底部から蓋部側へと伸びて形成された第一リード線挿通部を有し、蓋部は、前記外壁部の開口縁に対向する傘部と、前記第一リード線挿通部の先部に固着された固着部と、該固着部と間隔を空けて設けられた略円筒状の遮断壁と、前記第一リード線挿通部に連通する第二リード線挿通部を有し、前記第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域内にドライバンドを有していることによりリード線表面と一次ブッシングとが絶縁されることを特徴とする。 The leakage current prevention device according to claim 1 of the present invention includes a main body attached to a primary bushing of a transformer, and a lid attached opposite to the main body, and the main body has a substantially bowl-like shape. An outer wall portion, a first lead wire insertion portion formed extending from a bottom portion of the outer wall portion to the lid portion side , wherein the lid portion has an umbrella portion facing an opening edge of the outer wall portion; A fixing portion fixed to the tip of the lead wire insertion portion, a substantially cylindrical blocking wall provided at an interval from the fixing portion, and a second lead wire insertion portion communicating with the first lead wire insertion portion Having a dry land in a continuous surface region from the outer peripheral surface of the first lead wire insertion portion to the inner peripheral surface of the blocking wall, so that the lead wire surface and the primary bushing are insulated. Features.

本発明のうち請求項2記載の漏洩電流防止具は、遮断壁の内周面には、変圧器側に向けて内径の増大する第一傾斜部が設けられていることを特徴とする。 According to a second aspect of the present invention, there is provided the leakage current preventing device, wherein a first inclined portion having an inner diameter that increases toward the transformer is provided on an inner peripheral surface of the blocking wall .

本発明のうち請求項3記載の漏洩電流防止具は、外壁部の内周面には、開口縁に向かって内径の増大する第二傾斜部が設けられており、第一リード線挿通部の外周面には、基端部から中間部に向かって外周径の減少する第三傾斜部が設けられていることを特徴とする。 According to the third aspect of the present invention, the inner peripheral surface of the outer wall portion is provided with a second inclined portion having an inner diameter that increases toward the opening edge. The outer peripheral surface is provided with a third inclined portion whose outer peripheral diameter decreases from the base end toward the intermediate portion .

本発明のうち請求項4記載の漏洩電流防止具は、外壁部の開口縁および傘部の縁部が、互いに離反する方向に反り返っていることを特徴とする。 The leakage current preventer according to claim 4 of the present invention is characterized in that the opening edge of the outer wall and the edge of the umbrella are warped in directions away from each other .

本発明のうち請求項5記載の漏洩電流防止具は、傘部の外径が、前記外壁部の外径よりも大きいことを特徴とする。 The leakage current preventer according to claim 5 of the present invention is characterized in that the outer diameter of the umbrella portion is larger than the outer diameter of the outer wall portion .

請求項1記載の発明によれば、本体部または蓋部の内表面に、漏洩電流防止具外部から汚損物が入り込み難く乾燥状態を保ちやすい領域(以下、ドライバンドという)を有していることで、リード線表面と一次ブッシングとが絶縁され(すなわち漏洩電流の経路が遮断され)、トラッキングによるリード線の損傷被害を防止することができるので、リード線の劣化を防げ、リード線の交換頻度低減によるリード線費用及び作業費用を低減でき、さらには漏洩電流による電力ロスを低減できる。   According to the first aspect of the present invention, the inner surface of the main body or the lid has an area (hereinafter referred to as dryland) in which it is difficult for contaminants to enter from the outside of the leakage current preventer and the dry state is easily maintained. As a result, the surface of the lead wire is insulated from the primary bushing (that is, the path of the leakage current is interrupted), and damage to the lead wire due to tracking can be prevented. The lead wire cost and work cost can be reduced due to the reduction, and power loss due to leakage current can be reduced.

また、請求項記載の発明によれば、本体部が、略椀状の外壁部と、該外壁部の底部から蓋部側へと伸びて形成された第一リード線挿通部を有し、蓋部が、前記外壁部の開口縁に対向する傘部と、前記第一リード線挿通部の先部に固着された固着部と、該固着部と間隔を空けて設けられた略円筒状の遮断壁を有し、本体部の第一リード線挿通部と蓋部の固着部とで固着、一体化された該漏洩電流防止具の内部の、第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域内にドライバンドが形成されることで、リード線表面と一次ブッシングとが絶縁され(すなわち漏洩電流の経路が遮断され)、トラッキングによるリード線の損傷被害を防止することができる。また、本体部の外壁部の開口縁と傘部が対向していることで、汚損物が外壁部および傘部の内部へと容易に入り込むことを防げ、ドライバンドの乾燥状態をより長期的に保つことができる。 Further, according to the first aspect of the invention, a body portion, and a substantially bowl-shaped outer wall, a first lead wire insertion portion formed extending to the lid portion side from the bottom of the outer wall portion, The lid portion has an umbrella portion facing the opening edge of the outer wall portion, a fixed portion fixed to the tip of the first lead wire insertion portion, and a substantially cylindrical shape provided at an interval from the fixed portion. A shielding wall having an outer peripheral surface of the first lead wire insertion portion inside the integrated leakage current prevention device fixed and integrated with the first lead wire insertion portion of the main body portion and the fixing portion of the lid portion; The dryland is formed in a continuous surface area over the inner peripheral surface of the lead wire, so that the lead wire surface and the primary bushing are insulated from each other (that is, the leakage current path is cut off), and the lead wire is prevented from being damaged due to tracking. can do. In addition, since the opening edge of the outer wall of the main body and the umbrella face each other, it is possible to prevent dirt from easily entering the outer wall and the inside of the umbrella, and to keep the dry state of the dryland for a longer period of time. Can be kept.

請求項記載の発明によれば、遮断壁の内周面に、変圧器側に向けて内径の増大する第一傾斜部が設けられていることで、漏洩電流防止具内部に汚損物が入り込んだとしても、第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域に付着した汚損物は重力により下方へと流れて該領域外へと排出されるため、ドライバンドの乾燥状態がより長期的に保たれる。 According to the second aspect of the present invention, the first inclined portion whose inner diameter increases toward the transformer is provided on the inner peripheral surface of the blocking wall, so that contaminants enter the leakage current prevention device. Even so, the contaminants adhering to the continuous surface region from the outer peripheral surface of the first lead wire insertion portion to the inner peripheral surface of the blocking wall flow downward due to gravity and are discharged out of the region. Is kept for a longer period of time.

請求項記載の発明によれば、漏洩電流防止具内部に汚損物が入り込んだとしても、外壁部の内周面に、開口縁に向かって内径の増大する第二傾斜部が設けられているので、外壁部の内周面に付着した汚損物は重力により内周面を伝って下方へと流れて外壁部の下端部から排出されるため、汚損物が第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域へ浸入し難くなり、ドライバンドの乾燥状態がより長期的に保たれる。また、第一リード線挿通部の外周面に、基端部から中間部に向かって外周径の減少する第三傾斜部が設けられていることで、第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域に付着した汚損物が重力により下方へと流れることで該領域外へと排出されるため、ドライバンドの乾燥状態がより長期的に保たれる。 According to the third aspect of the present invention, the second inclined portion whose inner diameter increases toward the opening edge is provided on the inner peripheral surface of the outer wall portion even if contaminants enter the inside of the leakage current prevention device. Therefore, the contaminants adhering to the inner peripheral surface of the outer wall portion flow down the inner peripheral surface due to gravity and are discharged from the lower end portion of the outer wall portion, so that the contaminants are removed from the outer peripheral surface of the first lead wire insertion portion. To the inner peripheral surface of the blocking wall, it is difficult to penetrate into a continuous surface region, and the dry state of the dryland is maintained for a longer period. Further, the outer peripheral surface of the first lead wire insertion portion is provided with a third inclined portion whose outer diameter decreases from the base end portion toward the intermediate portion, so that the outer peripheral surface of the first lead wire insertion portion is blocked. Since the contaminants adhering to the continuous surface area over the inner peripheral surface of the wall flow downward due to gravity and are discharged out of the area, the dry state of the dryland is maintained for a longer period of time.

請求項記載の発明によれば、外壁部の開口縁および傘部の縁部が互いに離反する方向に反り返っていることで、本体部と蓋部それぞれの下端から滴下した水滴同士の交わりが抑制されるので、水滴の交わり箇所が導電路となることによる漏洩電流の発生を防止することが可能である。 According to the invention as set forth in claim 4 , since the opening edge of the outer wall portion and the edge portion of the umbrella portion warp in directions away from each other, the intersection of water droplets dropped from the lower ends of the main body portion and the lid portion is suppressed. Therefore, it is possible to prevent the occurrence of leakage current due to the intersection of the water droplets serving as a conductive path.

請求項記載の発明によれば、傘部の外径が前記外壁部の外径よりも大きいので、汚損物が外壁部および傘部の内部へとより入り込み難くなり、ドライバンドの乾燥状態をより長期的に保つことができる。 According to the invention as set forth in claim 5 , since the outer diameter of the umbrella portion is larger than the outer diameter of the outer wall portion, it becomes more difficult for dirt to enter the outer wall portion and the inside of the umbrella portion, and the dry state of the dryland is reduced. Can be kept longer.

漏洩電流防止具を柱上変圧器一次ブッシングに取り付けた状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which attached the leakage current prevention tool to the pole transformer primary bushing. 漏洩電流防止具の斜視図である。It is a perspective view of a leakage current prevention tool. 漏洩電流防止具の縦断面図である。It is a longitudinal cross-sectional view of a leakage current prevention tool. 汚損物の流れる経路を示す概略図である。It is the schematic which shows the path | route which a contaminated material flows. 従来の縦型漏洩電流防止傘の側面図及び断面図である。It is the side view and sectional view of the conventional vertical leakage current prevention umbrella.

以下、本発明の実施の形態を図面に基づいて説明する。以下の好ましい実施形態の説明は、本質的に例示に過ぎず、本発明、その適用物あるいはその用途を制限することを意図するものではない。
ここでは、本発明の漏洩電流防止具が柱上変圧器の一次ブッシングの磁器製の碍子31に取り付けられる場合を示す。なお、以下において前後とは、図1における右及び左方向とする。本実施形態の漏洩電流防止具は、図1乃至図4に示すように、前後方向に対向する本体部1及び蓋部2から構成されており、本体部1及び蓋部2を構成する各部はそれぞれ、挿通されるリード線32を中心とする同心円状の対称形をなしている。なお、本体部1及び蓋部2の材質については、例えばシリコーンゴム等の撥水性樹脂で形成されていることが望ましい。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its applications, or its uses.
Here, a case is shown in which the leakage current prevention device of the present invention is attached to a porcelain insulator 31 of a primary bushing of a pole transformer. In the following, the front and rear are the right and left directions in FIG. As shown in FIGS. 1 to 4, the leakage current prevention device of the present embodiment includes a main body 1 and a lid 2 facing each other in the front-rear direction. Each has a concentric symmetrical shape centered on the lead wire 32 to be inserted. The material of the main body 1 and the lid 2 is desirably formed of a water-repellent resin such as silicone rubber.

漏洩電流防止具の本体部1は、図1乃至図4に示すように、碍子31に取り付けられる略二重円筒状の底部12と、底部12の外周面に連結されている略椀状の外壁部11と、底部12の略中心部から蓋部2方向に突出し、リード線32が挿通される第一リード線挿通部13を備えている。底部12は、外壁部11の基部11aの端部に連結された第一円筒部12aと、第一円筒部12aの内周側に位置する第二円筒部12cと、両者の前端部を略鉛直方向に連結する連結部12dにより構成されている。第一円筒部12aの内周面と第二円筒部12cとの隙間12bが碍子31の外管31aの前端部と嵌合することにより、本体部1は碍子31に固定される。外壁部11は、底部12の外周面から延出した基部11aと、中間部11bと、縁部(開口縁)11cとで構成されていて、基部11a及び中間部11bは、それぞれ前側へ向かって内径が増大しているため、外壁部11の内周面には水平面に対して傾斜した第二傾斜部11dが前後方向に亘って形成されている。縁部11cは、後述の蓋部2の傘部21の縁部21bと離反する方向に反り返った形状である。第一リード線挿通部13は、基部13aと、先端部13bとで構成されており、内部には長手方向に亘ってリード線32の挿通孔13dを有している。基部13aは、底部12に連結した端部から先端部13bに向かって外径が小さくなっており、基部13aの外周面には水平面に対し傾斜した第三傾斜部13cが前後方向に亘って形成されている。先端部13bの前側端部は、外壁部11の縁部11cよりも前側に位置していて、図1あるいは図3に示すように、先端部13bが後述の蓋部2の環状部(固着部)23に嵌合することで本体部1と蓋部2が固着される。そのため、先端部13bの形状は、環状部23との嵌合が妨げられないよう、外径の変化しない円筒状、あるいは先端方向に向かって外径が小さくなる形状であることが好ましい。また、先端部13bの内径は、リード線32への取り付け後にリード線32との隙間が生じない程度の寸法であることが望ましい。   As shown in FIGS. 1 to 4, the main body 1 of the leakage current prevention device has a substantially double cylindrical bottom 12 attached to the insulator 31 and a substantially bowl-shaped outer wall connected to the outer peripheral surface of the bottom 12. A portion 11 and a first lead wire insertion portion 13 protruding from a substantially central portion of the bottom portion 12 in the direction of the lid portion 2 and through which a lead wire 32 is inserted are provided. The bottom portion 12 has a first cylindrical portion 12a connected to an end portion of the base portion 11a of the outer wall portion 11, a second cylindrical portion 12c located on the inner peripheral side of the first cylindrical portion 12a, and a front end portion of both of them being substantially vertical. It is constituted by a connecting portion 12d that connects in the directions. The main body 1 is fixed to the insulator 31 by fitting the gap 12b between the inner peripheral surface of the first cylindrical portion 12a and the second cylindrical portion 12c with the front end of the outer tube 31a of the insulator 31. The outer wall portion 11 includes a base portion 11a extending from the outer peripheral surface of the bottom portion 12, an intermediate portion 11b, and an edge portion (opening edge) 11c. The base portion 11a and the intermediate portion 11b are respectively directed toward the front side. Since the inner diameter is increased, a second inclined portion 11d that is inclined with respect to a horizontal plane is formed on the inner peripheral surface of the outer wall portion 11 in the front-rear direction. The edge 11c has a shape that warps in a direction away from the edge 21b of the umbrella 21 of the lid 2 described later. The first lead wire insertion portion 13 includes a base portion 13a and a distal end portion 13b, and has an insertion hole 13d for the lead wire 32 in the longitudinal direction inside. The outer diameter of the base portion 13a decreases from the end portion connected to the bottom portion 12 to the tip portion 13b, and a third inclined portion 13c that is inclined with respect to a horizontal plane is formed on the outer peripheral surface of the base portion 13a in the front-rear direction. Have been. The front end of the tip portion 13b is located on the front side of the edge portion 11c of the outer wall portion 11, and as shown in FIG. 1 or FIG. ) 23, the main body 1 and the lid 2 are fixed. Therefore, the shape of the distal end portion 13b is preferably a cylindrical shape whose outer diameter does not change or a shape whose outer diameter decreases toward the distal end so that the fitting to the annular portion 23 is not hindered. Further, it is desirable that the inner diameter of the distal end portion 13b is a dimension that does not cause a gap with the lead wire 32 after being attached to the lead wire 32.

蓋部2は、図1乃至図4に示すように、本体部1の外壁部11に対向する無底略円錐状の傘部21と、傘部21前面の略中心部から前方へ突出した略円筒形の第二リード線挿通部22と、傘部21の後面から後方へと伸びて設けられ、本体部1の第一リード線挿通部13の先端部13bに嵌合する略円筒形の環状部(固着部)23と、環状部23の外周側に間隔をおいて傘部21の後面から後方へ伸びて形成された略円筒形の遮断壁24から構成されている。傘部21の縁部21bと外壁部11の縁部11cは隙間Gを空けて対向していて、傘部21の外径は本体部1の外壁部11の縁部11cの外径よりも大きく、傘部21の縁部21bは、縁部11cと離反する方向に反り返った形状である。隙間Gの前後方向の径は、汚損物が外壁部11および傘部21の内部へと容易に入り込むことを防げる程度に狭く、かつ、縁部11cと縁部21bとからそれぞれ滴下する水滴が交わって縁部11cと縁部21b間に導電路を形成してしまうことがない程度に広く形成されている。第二リード線挿通部22は、その内部に長手方向に亘ってリード線32が挿通される挿通孔22aを有していて、その内径は、リード線32のへの取り付け後にリード線32との隙間が生じない程度の寸法であることが望ましい。図1あるいは図3に示すように、環状部23の内周面は、本体部1の第一リード線挿通部13の先端部13bの外形に略相似した形状であり、先端部13bと環状部23とが嵌合することで本体部1と蓋部2が固着される。さらに、環状部23の後端の位置は、先端部13bの後端の位置よりも、第三傾斜部13cを覆ってしまわない程度にやや後方に設けておくことが、本体部1と蓋部2の接合強度を保持する目的において好ましい。また環状部23の外周面は、外径が前方へ向けて増大する傾斜面であってもよい。環状部23の外周側に間隔をおいて設けられた略円筒状の遮断壁24は、本体部1と蓋部2を組み合わせた際に、遮断壁24の後端が本体部1の内部の、概ね外壁部11の前後方向中心付近にまで入り込む形状であって、遮断壁24の後端部の外径は底部12の第一円筒部12aと略同じであり、遮断壁24の後端部と第一円筒部12aの前端部は互いに間隔を空けて対向している。遮断壁24の内径は後方に向かって増大しており、遮断壁24の内周面には、水平面に対して傾斜した第一傾斜部24aが前後方向に亘って形成されている。   As shown in FIGS. 1 to 4, the lid 2 has a substantially conical bottomless umbrella 21 facing the outer wall 11 of the main body 1, and a substantially protruding front from a substantially central portion of the front surface of the umbrella 21. A cylindrical second lead wire insertion portion 22 and a substantially cylindrical annular portion that is provided to extend rearward from the rear surface of the umbrella portion 21 and that fits into the distal end portion 13 b of the first lead wire insertion portion 13 of the main body 1. A portion (fixed portion) 23 and a substantially cylindrical blocking wall 24 extending rearward from the rear surface of the umbrella portion 21 at an interval on the outer peripheral side of the annular portion 23. The edge 21b of the umbrella 21 and the edge 11c of the outer wall 11 face each other with a gap G therebetween, and the outer diameter of the umbrella 21 is larger than the outer diameter of the edge 11c of the outer wall 11 of the main body 1. The edge 21b of the umbrella 21 has a shape that warps in a direction away from the edge 11c. The diameter of the gap G in the front-rear direction is small enough to prevent the contaminated material from easily entering the inside of the outer wall portion 11 and the umbrella portion 21, and water drops dripping from the edge portion 11 c and the edge portion 21 b intersect. Thus, it is formed so wide that a conductive path is not formed between the edge 11c and the edge 21b. The second lead wire insertion portion 22 has an insertion hole 22a through which the lead wire 32 is inserted in the longitudinal direction, and the inner diameter of the second lead wire insertion portion 22 is different from that of the lead wire 32 after being attached to the lead wire 32. It is desirable that the dimensions be such that no gap is formed. As shown in FIG. 1 or FIG. 3, the inner peripheral surface of the annular portion 23 has a shape substantially similar to the outer shape of the distal end portion 13 b of the first lead wire insertion portion 13 of the main body portion 1. The main body 1 and the lid 2 are fixed to each other by fitting. Further, the position of the rear end of the annular portion 23 may be provided slightly behind the position of the rear end of the front end portion 13b so as not to cover the third inclined portion 13c. 2 is preferable for the purpose of maintaining the bonding strength. Further, the outer peripheral surface of the annular portion 23 may be a slope whose outer diameter increases toward the front. When the main body 1 and the cover 2 are combined, the rear end of the wall 24 is provided inside the main body 1. The outer wall 11 has a shape that generally enters the vicinity of the center of the outer wall 11 in the front-rear direction. The outer diameter of the rear end of the blocking wall 24 is substantially the same as the first cylindrical portion 12a of the bottom 12, and The front ends of the first cylindrical portions 12a face each other with a space therebetween. The inner diameter of the blocking wall 24 increases rearward, and a first inclined portion 24a that is inclined with respect to a horizontal plane is formed on the inner peripheral surface of the blocking wall 24 in the front-rear direction.

次に、本発明の漏洩電流防止具の施工方法を、図1に示す柱上変圧器から略水平に突出した一次ブッシングの碍子31に漏洩電流防止具を施工した場合に基づいて説明する。
まず、本体部1の第一リード線挿通部13の先端部13bを蓋部2の環状部23に挿入することで、本体部1と蓋部2とを一体化させる。そして、連通した第一リード線挿通部13と第二リード線挿通部22に対し、挿通孔13d側から挿通孔22a側へとリード線32の先端を通すことでリード線32を挿通し、その後、碍子31に漏洩電流防止具の本体部1の底部12を押し付け、第一円筒部12aの内周面と第二円筒部12cとの隙間12bと、碍子31の外管31aの前端部とを嵌合させることで漏洩電流防止具を碍子31に固定する。なおこのとき、第一円筒部12aの内周面に全周に亘って絶縁性防水パテを予め塗布しておくことで、第一円筒部12aと碍子31の外管31aを隙間無く密着させることが可能となり、両者間への汚損物の浸入を防げる。
Next, the method of applying the leakage current prevention device of the present invention will be described based on the case where the leakage current prevention device is applied to the insulator 31 of the primary bushing that projects substantially horizontally from the pole transformer shown in FIG.
First, the main body 1 and the lid 2 are integrated by inserting the distal end 13 b of the first lead wire insertion portion 13 of the main body 1 into the annular portion 23 of the lid 2. Then, the lead wire 32 is inserted into the first lead wire insertion portion 13 and the second lead wire insertion portion 22 by passing the leading end of the lead wire 32 from the insertion hole 13d side to the insertion hole 22a side. Then, the bottom portion 12 of the main body 1 of the leakage current preventing device is pressed against the insulator 31 so that the gap 12b between the inner peripheral surface of the first cylindrical portion 12a and the second cylindrical portion 12c and the front end of the outer tube 31a of the insulator 31 are separated. The leakage current preventing device is fixed to the insulator 31 by being fitted. At this time, the first cylindrical portion 12a and the outer tube 31a of the insulator 31 are brought into close contact with each other by applying an insulating waterproof putty on the entire inner peripheral surface of the first cylindrical portion 12a in advance. It is possible to prevent infiltration of contaminants between the two.

また、上記の手順の他、本体部1と蓋部2とが分離した状態のままで、まず、本体部1の第一リード線挿通部13に図1の後側からリード線32を通し、その後、本体部1の底部12を碍子31先端に押し付け密着させてから、蓋部2の第二リード線挿通部22に図1の後側からリード線32を通し、その後、本体部1の第一リード線挿通部13の先端部13bを蓋部2の環状部23に挿入して嵌合させ、漏洩電流防止具として一体化させることも可能である。   In addition, in addition to the above procedure, while the main body 1 and the lid 2 are kept separated, first, the lead wire 32 is passed through the first lead wire insertion portion 13 of the main body 1 from the rear side of FIG. Thereafter, the bottom portion 12 of the main body 1 is pressed against and adhered to the tip of the insulator 31, and then the lead wire 32 is passed through the second lead wire insertion portion 22 of the lid 2 from the rear side of FIG. It is also possible to insert and fit the distal end portion 13b of the one lead wire insertion portion 13 into the annular portion 23 of the lid portion 2 so as to be integrated as a leakage current prevention tool.

そして、リード線32が挿通された漏洩電流防止具が碍子31に固定された後、第二リード線挿通部22の前端部とリード線32との境界の隙間から漏洩電流防止具内部への汚損物の侵入を防ぐため、該境界箇所の周辺に自己融着テープ等を巻き付け、隙間を塞ぐ。以上で漏洩電流防止具の碍子31への取り付けが完了する。   Then, after the leakage current prevention tool into which the lead wire 32 has been inserted is fixed to the insulator 31, contamination inside the leakage current prevention tool from the gap at the boundary between the front end of the second lead wire insertion portion 22 and the lead wire 32. In order to prevent entry of an object, a self-sealing tape or the like is wrapped around the boundary to close the gap. Thus, the attachment of the leakage current prevention device to the insulator 31 is completed.

次いで、本発明の漏洩電流防止具による作用効果を説明する。本発明の漏洩電流防止具を図1のように柱上変圧器一次ブッシングの碍子31に取り付けると、本体部1の外壁部11の縁部11cと傘部21の縁部21bが隙間Gを空けて対向していることにより、汚損物が短絡防止具の内部(外壁部11および傘部21の内部)に入り込み難くなっている。また、遮断壁24の後端が本体部1の内部の、概ね外壁部11の前後方向中心付近にまで入り込む形状であり、第一〜第三傾斜部が設けられていることで、円周方向の全周に亘って汚損物が非常に付着し難い表面領域(以下、ドライバンドSとする)が生じる。ドライバンドSは、遮断壁24の内周面と、環状部23の外周面と、それらを繋いでいる傘部21の後面21a、そして第一リード線挿通部13の基部13aの外周面のうち、遮断壁の後端よりも前側の部分により形成されている。外壁部11の縁部11cと傘部21の縁部21b間との間から汚損物が漏洩電流防止具内に入り込んだとしても、汚損物は、図4に示す経路を経て漏洩電流防止具内を流れ落ち、下方へと排出される。詳しくは、本体部1の第一リード線挿通部13外周面に設けた第三傾斜部13c、蓋部2の遮断壁24内周面に設けた第一傾斜部24a、本体部1の外壁部11内周面に設けた第二傾斜部11dによって、内部に入り込んだ汚損物が重力により漏洩電流防止具の外部に容易に排出される。
このようにしてドライバンドSが形成されるため、碍子31の外管31aの外周面から、第二リード線挿通部22の先端部から露出するリード線32の表面までの連続した表面経路に、汚損物の付着し難い帯状領域であるドライバンドSが介在することとなり、その結果碍子31とリード線32表面の間における導電路の形成が防止され(すなわち、両者が絶縁され)、漏洩電流に起因するトラッキングによるリード線32の損傷被害が防止される。さらに蓋部2の傘部21の外径を本体部1の外壁部11の外径よりも大きくすることで、漏洩電流防止具内部への汚損物の吹き込みを防止できる。以上の構成により、ドライバンドSの乾燥状態を長期にわたって維持することが可能となり、漏洩電流の発生を長期にわたって防止することができるので、トラッキングによるリード線32の損傷を防げ、リード線32の交換頻度低減によるリード線32費用及び作業費用を低減でき、さらには漏洩電流による電力ロスを低減できる。
Next, the function and effect of the leakage current prevention device of the present invention will be described. When the leakage current prevention device of the present invention is attached to the insulator 31 of the primary bushing primary bushing as shown in FIG. 1, the edge 11c of the outer wall 11 of the main body 1 and the edge 21b of the umbrella 21 form a gap G. , It is difficult for the contaminated material to enter the inside of the short-circuit preventing device (the inside of the outer wall portion 11 and the umbrella portion 21). Further, the rear end of the blocking wall 24 is shaped so as to penetrate into the inside of the main body 1, substantially near the center in the front-rear direction of the outer wall portion 11, and the first to third inclined portions are provided so that the circumferential direction is provided. A surface area (hereinafter, referred to as dry land S) on which contaminants are extremely unlikely to adhere is generated over the entire circumference of. The dryland S is formed of an inner peripheral surface of the blocking wall 24, an outer peripheral surface of the annular portion 23, a rear surface 21 a of the umbrella 21 connecting them, and an outer peripheral surface of the base 13 a of the first lead wire insertion portion 13. , Formed by a portion on the front side of the rear end of the blocking wall. Even if the contaminant enters the leakage current preventive device from between the edge 11c of the outer wall portion 11 and the edge portion 21b of the umbrella portion 21, the contaminant remains in the leakage current preventive device via the path shown in FIG. And is discharged downward. More specifically, a third inclined portion 13c provided on the outer peripheral surface of the first lead wire insertion portion 13 of the main body portion 1, a first inclined portion 24a provided on the inner peripheral surface of the blocking wall 24 of the lid portion 2, and an outer wall portion of the main body portion 1 Due to the second inclined portion 11d provided on the inner peripheral surface of the eleventh, the contaminated matter that has entered inside can be easily discharged to the outside of the leakage current preventing device by gravity.
Since the dryland S is formed in this manner, a continuous surface path from the outer peripheral surface of the outer tube 31a of the insulator 31 to the surface of the lead wire 32 exposed from the distal end of the second lead wire insertion portion 22 is formed. Dry band S, which is a belt-like region to which dirt does not easily adhere, is interposed. As a result, formation of a conductive path between insulator 31 and the surface of lead wire 32 is prevented (ie, both are insulated), and leakage current is reduced. The damage and damage of the lead wire 32 due to the tracking caused thereby can be prevented. Further, by making the outer diameter of the umbrella portion 21 of the lid portion 2 larger than the outer diameter of the outer wall portion 11 of the main body portion 1, it is possible to prevent the inflow of contaminants into the leakage current prevention device. With the above configuration, the dry state of the dryland S can be maintained for a long time, and the generation of leakage current can be prevented for a long time. Therefore, damage to the lead wire 32 due to tracking can be prevented, and replacement of the lead wire 32 can be prevented. It is possible to reduce the cost of the lead wire 32 and the operation cost due to the reduction in frequency, and it is also possible to reduce power loss due to leakage current.

また、本体部1の外壁部11の下端部から滴下する水滴と、蓋部2の傘部21の下端部から滴下する水滴が交わると、その部分が導電路となり漏洩電流が発生する虞があるが、本発明の漏洩電流防止具は、本体部1の外壁部11の縁部11cと蓋部2の傘部21の縁部21bが、それぞれ離反する方向に反り返った形状であることにより、本体部1の外壁部11の内周面、外周面を滑落してきた水分は、図4に示すように外壁部11の下端部から後側を滴下することとなり、また、蓋部2の傘部21の内周面及び外周面を滑落してきた水分は、傘部21の下端部から前側を滴下することになり、本体部1から滴下する水滴と蓋部2から滴下する水滴が交わることを防止することが可能となり、水滴の交わりに起因する漏洩電流を防止することができる。   Further, when a water drop dripping from the lower end of the outer wall 11 of the main body 1 and a water drop dripping from the lower end of the umbrella 21 of the lid 2 intersect, the part becomes a conductive path and a leakage current may be generated. However, the leakage current prevention device of the present invention has a structure in which the edge portion 11c of the outer wall portion 11 of the main body portion 1 and the edge portion 21b of the umbrella portion 21 of the lid portion 2 are curved in the directions away from each other. Moisture that has slipped down on the inner and outer peripheral surfaces of the outer wall 11 of the part 1 will be dripped from the lower end of the outer wall 11 to the rear as shown in FIG. The water that has slid down the inner and outer peripheral surfaces of the umbrella will drop on the front side from the lower end of the umbrella portion 21, preventing water droplets dropped from the main body portion 1 from intersecting with water droplets dropped from the lid portion 2. To prevent leakage currents due to the intersection of water droplets It can be.

さらに、漏洩電流防止具の本体部1及び蓋部2を撥水性樹脂で形成してあることで、水接触角が大きい撥水性樹脂の表面に付着した水分は、水玉状の液滴となり滑落しやすくなることから、漏洩電流防止具内部に入り込んだ水分の外部への排出が促進され、さらに長期にわたってドライバンドSの乾燥状態を保つことが可能となる。また、シリコーンゴムは、表面上で水玉状の液滴となった水分が、樹脂表面に既に付着していた汚れを巻き込みながら(洗浄しながら)流れ落ちる性質があるため、本体部1及び蓋部2の各部への汚損物の付着がより抑制されるので、導電路が形成されにくく、より長期間にわたりトラッキングを防止できる。   Furthermore, since the main body 1 and the lid 2 of the leakage current prevention device are formed of a water-repellent resin, the water adhering to the surface of the water-repellent resin having a large water contact angle becomes a polka dot droplet and slides down. This facilitates the discharge of moisture that has entered the inside of the leakage current prevention device to the outside, and makes it possible to maintain the dry state of the dryland S for a long period of time. In addition, silicone rubber has a property that water that has been formed as polka dots on the surface flows down while entraining (washing) dirt that has already adhered to the resin surface. Since the adhesion of the contaminants to the respective parts is further suppressed, a conductive path is hardly formed, and tracking can be prevented for a longer period.

本発明は、上記の実施形態に限らず本発明の要旨を逸脱しない範囲で変形可能であり、例えば材質はシリコーンゴム以外の撥水性樹脂や、撥水性コーティング等の表面処理を施した撥水性樹脂以外の材質を採用することも可能である。また、本体部及び蓋部を、それぞれリード線を中心とした一対の半割り形状の部材で形成すれば、施工時に各リード線挿通部にリード線の先端部を挿通しなくとも、一対の半割本体部及び半割蓋部でリード線を挟み込んだのち半割部材同士を固定するだけで簡便に取り付け可能であり、作業性に優れる。さらに上記のような構成とすることで、柱状変圧器が既設であり、リード線の端部を取り外すことのできない場合においても漏洩電流防止具を取り付け可能である。また、固着部の形状は環状でなくともよく、例えば複数の板状部材で第一リード線挿通部を挟み込むことで固着するものであってもよいし、本体部と蓋部とが一体形成されていてもよい。また、ドライバンドは、汚損物による導電路形成を防止できれば、バンド状(帯状)である必要は無く、ライン状(線状)等、各種形状も可能である。そして、各部の形状、サイズ、寸法比等も適用する変圧器やケーブルの種類に応じて適宜変更可能である。   The present invention is not limited to the above embodiments, and can be modified without departing from the spirit of the present invention. For example, the material is a water-repellent resin other than silicone rubber, or a water-repellent resin subjected to a surface treatment such as a water-repellent coating. Other materials can be used. In addition, if the main body and the lid are each formed of a pair of half-shaped members centered on the lead wire, the pair of half-split portions can be inserted without inserting the lead wire tip into each lead wire insertion portion at the time of construction. After the lead wire is sandwiched between the split main body portion and the half split lid portion, it can be easily attached simply by fixing the half split members, and is excellent in workability. Further, with the above-described configuration, the leakage current prevention device can be attached even when the columnar transformer is already provided and the end of the lead wire cannot be removed. Further, the shape of the fixing portion is not limited to an annular shape, and may be, for example, fixed by sandwiching the first lead wire insertion portion between a plurality of plate members, or the main body portion and the lid portion are integrally formed. May be. The dryland does not need to be band-shaped (band-shaped) as long as it can prevent formation of conductive paths due to contaminants, and various shapes such as line-shaped (linear) can be used. The shape, size, dimensional ratio, and the like of each part can be appropriately changed according to the type of the transformer or cable to be applied.

1 本体部
11 外壁部
11c 縁部(開口縁)
11d 第二傾斜部
12 底部
13 第一リード線挿通部
13c 第三傾斜部
2 蓋部
21 傘部
22 第二リード線挿通部
23 環状部(固着部)
24 遮断壁
24a 第一傾斜部
31 碍子
32 リード線
S ドライバンド
1 Body
11 outer wall
11c Edge (opening edge)
11d second slope
12 bottom
13 First lead wire insertion part
13c Third slope
2 Lid
21 Umbrella Club
22 Second lead wire insertion part
23 Annular part (fixed part)
24 Blocking wall
24a first slope
31 Insulator
32 lead wires
S Dryland

Claims (6)

変圧器の一次ブッシングに取り付けられる本体部と、該本体部に対向して取り付けられる蓋部とを備え、
本体部は、第一リード線挿通部を有し、
蓋部は、前記第一リード線挿通部に連通する第二リード線挿通部を有し、
本体部または蓋部の内表面にドライバンドを有していることによりリード線表面と一次ブッシングとが絶縁されることを特徴とする漏洩電流防止具。
A main body attached to the primary bushing of the transformer, and a lid attached to face the main body,
The main body has a first lead wire insertion portion,
The lid has a second lead wire insertion portion communicating with the first lead wire insertion portion,
A leakage current prevention device characterized in that a lead wire surface and a primary bushing are insulated from each other by having a dry head on an inner surface of a main body or a lid.
本体部は、略椀状の外壁部と、該外壁部の底部から蓋部側へと伸びて形成された第一リード線挿通部を有し、
蓋部は、前記外壁部の開口縁に対向する傘部と、前記第一リード線挿通部の先部に固着された固着部と、該固着部と間隔を空けて設けられた略円筒状の遮断壁を有し、
第一リード線挿通部の外周面から遮断壁の内周面にかけて連続した面領域内にドライバンドを有することを特徴とする請求項1記載の漏洩電流防止具。
The main body portion has a substantially bowl-shaped outer wall portion, and a first lead wire insertion portion formed extending from the bottom of the outer wall portion to the lid portion side,
The lid portion has an umbrella portion facing the opening edge of the outer wall portion, a fixed portion fixed to the tip of the first lead wire insertion portion, and a substantially cylindrical shape provided at an interval from the fixed portion. Having a blocking wall,
2. The leakage current prevention device according to claim 1, wherein the dryland has a dry land in a continuous surface area from an outer peripheral surface of the first lead wire insertion portion to an inner peripheral surface of the blocking wall.
遮断壁の内周面には、変圧器側に向けて内径の増大する第一傾斜部が設けられていることを特徴とする請求項2記載の漏洩電流防止具。   3. The leakage current prevention device according to claim 2, wherein a first inclined portion whose inner diameter increases toward the transformer is provided on an inner peripheral surface of the blocking wall. 外壁部の内周面には、開口縁に向かって内径の増大する第二傾斜部が設けられており、第一リード線挿通部の外周面には、基端部から中間部に向かって外周径の減少する第三傾斜部が設けられていることを特徴とする請求項2または3記載の漏洩電流防止具。   A second inclined portion whose inner diameter increases toward the opening edge is provided on the inner peripheral surface of the outer wall portion, and the outer peripheral surface of the first lead wire insertion portion has an outer peripheral surface extending from the base end toward the intermediate portion. The leakage current prevention device according to claim 2 or 3, wherein a third inclined portion having a reduced diameter is provided. 外壁部の開口縁および傘部の縁部が、互いに離反する方向に反り返っていることを特徴とする請求項2、3または4記載の漏洩電流防止具。   5. The leakage current prevention device according to claim 2, wherein the opening edge of the outer wall portion and the edge portion of the umbrella portion are warped in directions away from each other. 傘部の外径が、前記外壁部の外径よりも大きいことを特徴とする請求項2、3、4または5記載の漏洩電流防止具。   6. The leakage current prevention device according to claim 2, wherein an outer diameter of the umbrella portion is larger than an outer diameter of the outer wall portion.
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