JPH024436Y2 - - Google Patents
Info
- Publication number
- JPH024436Y2 JPH024436Y2 JP3585281U JP3585281U JPH024436Y2 JP H024436 Y2 JPH024436 Y2 JP H024436Y2 JP 3585281 U JP3585281 U JP 3585281U JP 3585281 U JP3585281 U JP 3585281U JP H024436 Y2 JPH024436 Y2 JP H024436Y2
- Authority
- JP
- Japan
- Prior art keywords
- insulating
- tube
- fuse element
- fuse
- storage case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004804 winding Methods 0.000 claims description 17
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 230000008018 melting Effects 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 12
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical group [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 10
- 239000010425 asbestos Substances 0.000 claims description 9
- 229910052895 riebeckite Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 description 12
- 230000015556 catabolic process Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Fuses (AREA)
Description
【考案の詳細な説明】
本考案は低融点合金部と銀線部とを直列に接続
しさらにその低融点合金部の外周には消弧チユー
ブを被せたヒユーズエレメントを絶縁筒内に収納
しその収納したエレメントの両端を絶縁筒の上下
外周に固着した上下部両電極にそれぞれ接続しさ
らに絶縁筒の絶縁空間には消弧剤を充填した全領
域形高圧限流ヒユーズの改良に係り、特にアーク
エネルギーが最大となる遮断（電流値）において
も絶縁筒を熱破壊させることなく確実に遮断動作
が行なえる構造を提供せんとするものである。[Detailed description of the invention] The invention consists of a fuse element in which a low melting point alloy part and a silver wire part are connected in series, and an arc extinguishing tube is placed over the outer periphery of the low melting point alloy part, and the fuse element is housed in an insulating tube. The purpose of this project is to improve a full-area high-voltage, current-limiting fuse in which both ends of the stored element are connected to upper and lower electrodes fixed to the upper and lower outer peripheries of an insulating tube, and the insulation space of the insulating tube is filled with an arc extinguishing agent. It is an object of the present invention to provide a structure that can perform the interrupting operation reliably without thermally destroying the insulating cylinder even when the energy is the maximum (current value).
高圧配電線路では、従来の放出形ヒユーズに比
して遮断容量が大きいこと、無音、無炎であり安
全性が高いこと等の理由から限流ヒユーズが単独
で使用されたりあるいは開閉器及び高圧カツトア
ウト等のスイツチ類に組み込まれて使用されたり
している。そしてその中でも最近は第３図に示す
ように銀線と金合金の低融点合金線とを直列に接
続したヒユーズエレメントを使用すると共にさら
にこの低融点合金線の外周にハロゲン化合物、例
えばフツソ樹脂あるいはガラス繊維にシリコーン
を含浸した材料の消弧チユーブを被せて小電流領
域の遮断をも可能にした全領域形高圧カツトアウ
ト用限流ヒユーズが多く使用されるようになつ
た。しかしながら、このような全領域形高圧カツ
トアウト用限流ヒユーズでは性能アツプと同時に
上記のように他の機器への組み込み等を考慮して
小形軽量化が図られており、その絶縁筒の直径が
従来のものに比して一段と小さくなつている。そ
のため該ヒユーズにおける絶縁筒の絶縁空間つま
り内径は当然狭くなり特に巻芯にヒユーズエレメ
ントを捲回しこれを絶縁筒内に収納するようにし
た構造においては巻芯に捲回したヒユーズエレメ
ントと絶縁筒の内壁面間との距離が一段と接近し
た状態となる。そしてかかる構造のヒユーズにお
いて遮断が起こりそれが最大のアークエネルギー
となる電流値（ヒユーズの定格電流が７〜15Aの
高圧限流ヒユーズでは2000A程度）での遮断の場
合には、生成される高抵抗体物質の粒径が特に大
きくなるため、高熱状態の高抵抗体物質が無機質
のガラスあるいは磁器よりなる絶縁筒の内壁面に
まで到達（接触）し、その熱によつて絶縁筒を局
部的に加熱し偏熱破壊させたりする。 In high-voltage power distribution lines, current-limiting fuses are used alone or in switches and high-voltage cut-outs because they have a larger breaking capacity than conventional discharge type fuses, are silent and flameless, and are safer. It is used by being incorporated into switches such as Recently, as shown in Fig. 3, a fuse element in which a silver wire and a low melting point alloy wire of gold alloy are connected in series is used, and a halogen compound, such as fluorocarbon resin or Full-area high-voltage cut-out current-limiting fuses, which are made of glass fiber covered with an arc-extinguishing tube made of a material impregnated with silicone and capable of interrupting small current areas, have come into widespread use. However, such current-limiting fuses for full-area high-voltage cut-outs are designed to be smaller and lighter in order to improve their performance and to be incorporated into other equipment as mentioned above. It is much smaller than the previous one. Therefore, the insulating space, that is, the inner diameter of the insulating cylinder in the fuse is naturally narrow, and especially in a structure in which the fuse element is wound around the core and housed in the insulating cylinder, there is a gap between the fuse element wound around the core and the insulating cylinder. The distance between the inner wall surfaces becomes even closer. If a fuse with such a structure is broken and the current is broken at the maximum arc energy (approximately 2000A for a high voltage current limiting fuse with a rated current of 7 to 15A), a high resistance is generated. As the particle size of the body substance becomes particularly large, the highly heated high-resistance substance reaches (contacts) the inner wall surface of the insulating tube made of inorganic glass or porcelain, and the heat locally damages the insulating tube. It can be heated and destroyed by uneven heat.
すなわち大電流遮断時にヒユーズエレメント５
がその全長に亘つて溶融気化し、この溶融気化し
たヒユーズエレメントがつまり、アークがが同エ
レメントの周囲の消弧剤中に拡散浸透し、高抵抗
体物質を形成する。即ち、高抵抗物質は、巻芯の
外周面に対しその全長に亘つてスパイラルに巻か
れたエレメントに沿つて形成される。 In other words, when a large current is interrupted, fuse element 5
is melted and vaporized over its entire length, this melted and vaporized fuse element becomes clogged, and the arc diffuses into the arc extinguishing agent around the element, forming a high-resistance material. That is, the high-resistance material is formed along the spirally wound element over the entire length of the outer peripheral surface of the core.
それ故、高圧カツトアウト用限流ヒユーズのよ
うに絶縁筒の内径が極めて小さい場合には巻芯巻
芯つまりヒユーズエレメントが絶縁筒の中心に収
納配置されていないと同エレメントが絶縁筒の一
方の内壁面に対し接近することになるためこの状
態で大電流遮断が発生し、高抵抗物質が形成され
れば高熱状態の高抵抗体物質が絶縁筒の内壁面に
接触し、これによつて同筒の偏熱破壊を引き起こ
す。 Therefore, if the inner diameter of the insulating tube is extremely small, such as a current-limiting fuse for high-voltage cut-outs, if the core winding core, or fuse element, is not housed in the center of the insulating tube, the element will be located inside one side of the insulating tube. Since it comes close to the wall surface, a large current interruption occurs in this state, and if a high-resistance material is formed, the highly heated high-resistance material will come into contact with the inner wall surface of the insulating cylinder, and this will cause the same cylinder to causes uneven heat destruction.
本案は上記の点に鑑みて提案するもので、低融
点合金部３と銀線部４とを直列に接続しその低融
点合金部３の外周に消弧チユーブ２０を被せたヒ
ユーズエレメント５をスパイラルに巻いて絶縁筒
１内に密閉収納しその収納したエレメントの両端
を絶縁筒１の上下外周に固着した上下部両電極
７，８にそれぞれ接続しさらに絶縁筒１の絶縁空
間１に消弧剤６を充填した全領域形高圧カツトア
ウト用限流ヒユーズにおいて、上記ヒユーズエレ
メント及び表示体用収納ケース１３と、絶縁筒の
内壁面１ａとの間に介在して、特に石綿からなる
絶縁性用断熱部材１９を配設し、かつ、前記巻芯
の上端に固定したガイド金具２２に巻芯の軸心を
中心としたラツパ状拡開部２２ａを形成し、該拡
開部２２ａの上部電極７に対する係合と前記表示
体用収納ケース１３の絶縁筒１の下端に被着した
下部カバー１６の中心に対する係合とによりヒユ
ーズエレメント５を絶縁筒１内の中心部に設置さ
せるようにしたものである。 This proposal is proposed in view of the above points, and is a spiral fuse element 5 in which a low melting point alloy part 3 and a silver wire part 4 are connected in series and an arc extinguishing tube 20 is placed over the outer periphery of the low melting point alloy part 3. The element is wound up and hermetically stored in the insulating cylinder 1, and both ends of the stored element are connected to upper and lower electrodes 7 and 8 fixed to the upper and lower outer peripheries of the insulating cylinder 1, respectively, and an arc extinguishing agent is added to the insulating space 1 of the insulating cylinder 1. In the current limiting fuse for full-area high-pressure cut-out filled with 6, an insulating heat insulating member made of asbestos is interposed between the fuse element and display storage case 13 and the inner wall surface 1a of the insulating cylinder. 19, and a guide metal fitting 22 fixed to the upper end of the winding core is formed with a flap-shaped widened part 22a centered on the axis of the winding core, and the widened part 22a is engaged with the upper electrode 7. The fuse element 5 is installed at the center of the insulating tube 1 by engaging with the center of the lower cover 16 attached to the lower end of the insulating tube 1 of the display storage case 13.
以下、本案の技術思想を高圧カツトアウト用限
流ヒユーズにおいて具現化した場合の実施例につ
いて説明する。 Hereinafter, an embodiment will be described in which the technical idea of the present invention is realized in a current-limiting fuse for high-voltage cutout.
１は無機質のガラスあるいはアリミナ磁器より
なる絶縁筒であり、その筒内にはコージライトあ
るいはアルミナ焼結体よりなる巻芯２とこの巻芯
２の外周面２ａに対しその全長に亘つてスパイラ
ルにヒユーズエレメント５が捲回されている。ヒ
ユーズエレメント５は低融点合金部３と銀線部４
とを直列接続したものでその低融点合金部３の外
周面には消弧チユーブ２０が被せられている。２
１は消弧チユーブ２０内に消弧剤６が侵入しない
ように同チユーブ２０の両端の開口部２０ａに挿
着したガラス繊維性の密栓を示す。上記の構成か
らなる巻芯２およびヒユーズエレメント５は消弧
チユーブ２０を被せた低融点合金部３が絶縁筒１
の上下外周に固着した上部電極７と下部電極８と
の間に位置するように絶縁筒１内に密閉収納され
るものでこれらの収納後さらに絶縁筒１内の絶縁
空間１ｂには硅砂、石英等からなる消弧剤６が充
填される。７，８は絶縁筒１の上下外周に固着し
た挿入刃７ａ，８ａ付きの上部電極と下部電極で
あり、上部電極７の上端開口部７ｂには巻芯２の
上端部に嵌着したラツパ状のガイド金具２２の拡
開部２２ａがそのテーパ状の内壁面７ｃに係止し
て該巻芯２が絶縁筒１内の中心に支持されるよう
になつている。９は中空の巻芯内に配設された表
示用抵抗線であり、同抵抗線９の一端と銀線４の
一端４ａとは上記開口部７ｂを閉鎖する石綿等の
断熱性クツシヨン材１０を介して外部へ導出され
さらにその外側に密着した板状の金属キヤツプ１
１に半田付けされて上部電極７に接続されてい
る。１２はその半田を示す。１３は絶縁筒１の下
端に位置して内装した絶縁部材（合成樹脂）より
なる表示体用収納ケースであり同ケースはその一
端に設けた軸線方向に突出するガイド部１３ａを
巻芯２の下端２ｂに差し込んで同巻芯２を軸線方
向に延長するようにして直結している。９は巻芯
２内に配設した表示用抵抗線であり同線は表示体
用収納ケース１３に内装した表示体１４に一旦連
結しさらにその余長部分をヒユーズエレメント５
の銀線部４と共に導電板１７の一端１７ａに接続
している。１５は表示体１４の係止段部１４ａを
収納ケース１３の上端部１３ｂ間に圧縮状態で介
在する表示体用バネであり、表示体１４を常時飛
び出し方向（下方に）付勢している。１７は下部
カバー１６の絶縁筒１に対する取付時、同絶縁筒
と下部カバー１６間で挟着固定される導電板であ
りその一端１７ａを絶縁筒１の下端開口部１ｃに
位置させて上記のごとく銀線部４と接続しさらに
絶縁筒１の下端より下端外面１ｄに沿つて上方へ
延出した他端１７ｂをビス１８によつて下部電極
８に接続している。 Reference numeral 1 denotes an insulating cylinder made of inorganic glass or alumina porcelain, and inside the cylinder there is a winding core 2 made of cordierite or alumina sintered body, and a winding core 2 that extends spirally over its entire length against the outer peripheral surface 2a of this winding core 2. Fuse element 5 is wound. The fuse element 5 has a low melting point alloy part 3 and a silver wire part 4.
The outer peripheral surface of the low melting point alloy portion 3 is covered with an arc extinguishing tube 20. 2
Reference numeral 1 indicates glass fiber seal plugs inserted into the openings 20a at both ends of the arc-extinguishing tube 20 to prevent the arc-extinguishing agent 6 from entering the tube. In the winding core 2 and fuse element 5 having the above configuration, the low melting point alloy part 3 covered with the arc extinguishing tube 20 is connected to the insulating tube 1.
It is hermetically stored in an insulating cylinder 1 between an upper electrode 7 and a lower electrode 8 which are fixed to the upper and lower outer peripheries of the insulating cylinder 1. An arc extinguishing agent 6 consisting of, etc. is filled. Reference numerals 7 and 8 denote an upper electrode and a lower electrode with insertion blades 7a and 8a fixed to the upper and lower outer peripheries of the insulating cylinder 1, and the upper end opening 7b of the upper electrode 7 has a latch-like shape fitted to the upper end of the winding core 2. The expanded portion 22a of the guide fitting 22 is engaged with the tapered inner wall surface 7c, so that the winding core 2 is supported at the center within the insulating cylinder 1. Reference numeral 9 denotes a resistance wire for display disposed within a hollow winding core, and one end of the resistance wire 9 and one end 4a of the silver wire 4 are connected to a heat insulating cushion material 10 such as asbestos that closes the opening 7b. A plate-shaped metal cap 1 led out through the cap and closely attached to the outside.
1 and connected to the upper electrode 7. 12 indicates the solder. Reference numeral 13 denotes a display storage case made of an insulating member (synthetic resin) located at the lower end of the insulating tube 1, and the case includes a guide portion 13a provided at one end of the case that protrudes in the axial direction. 2b, and are directly connected to extend the same winding core 2 in the axial direction. Reference numeral 9 denotes a display resistance wire disposed inside the winding core 2. The wire is once connected to the display body 14 housed in the display body storage case 13, and its remaining length is connected to the fuse element 5.
It is connected to one end 17a of the conductive plate 17 together with the silver wire portion 4. Reference numeral 15 denotes a display spring which interposes the locking step portion 14a of the display body 14 in a compressed state between the upper end portion 13b of the storage case 13, and always urges the display body 14 in the pop-out direction (downward). Reference numeral 17 denotes a conductive plate which is clamped and fixed between the insulating tube and the lower cover 16 when the lower cover 16 is attached to the insulating tube 1, and its one end 17a is positioned at the lower end opening 1c of the insulating tube 1, as described above. The other end 17b, which is connected to the silver wire portion 4 and further extends upward from the lower end of the insulating cylinder 1 along the lower end outer surface 1d, is connected to the lower electrode 8 by a screw 18.
１６は導電板１７を覆うようにして絶縁筒１の
下端外面１ｄに被着した袋状の下部カバーであり
その後端１６ａの中央には係合凹部１６ｂと表示
体用***１６ｃとが設けられその内の係合凹部１
６ｂを収納ケース１３の下端部１３に嵌め、さら
に表示体用***１６ｃには先端１４ｂをアール状
に形成した表示体１４をその先端１４ｂがカバー
１６外へ突出しない程度に同***１６ｃに嵌入さ
せている。１９は絶縁筒１の内壁面１ａの全長に
亘つて内張りしたシート状石綿からなる絶縁性断
熱部材を示す。また絶縁筒１の全長に亘つて絶縁
性断熱部材１９を設けるのでなく第３図のように
消弧チユーブ２０の外側に若干の間隔を保つてパ
イプ状の石綿からなる絶縁性断熱部材１９を配置
する。また上記絶縁性断熱部材１９はその長手方
向の長さが少なくとも消弧チユーブ２０の両端
開口部２０ａよりさらに長手方向に延長させる
（消弧チユーブを覆うようにする）ことが必要で
ある。なお、パイプ状の絶縁性断熱部材１９は消
弧チユーブ２０を覆うだけではなく絶縁筒１の内
壁面１ａと銀線部４間の距離が接近する表示体用
収納ケース１３付近の外周面に沿つて同ケース１
３を覆うようにすれば遮断時にヒユーズエレメン
ト５と消弧剤６とで形成される高熱の高抵抗体物
質（通称いも虫という）が同部材により遮断され
て同部分における絶縁筒の偏熱破壊を防止するこ
とができる。 Reference numeral 16 denotes a bag-shaped lower cover that is attached to the outer surface 1d of the lower end of the insulating tube 1 so as to cover the conductive plate 17, and an engagement recess 16b and a display small hole 16c are provided in the center of the rear end 16a. Engagement recess 1 inside
6b into the lower end 13 of the storage case 13, and further fit the display body 14, which has a rounded tip 14b into the small hole 16c for the display body, into the small hole 16c to the extent that the tip 14b does not protrude outside the cover 16. ing. Reference numeral 19 indicates an insulating heat-insulating member made of sheet-like asbestos that is lined over the entire length of the inner wall surface 1a of the insulating cylinder 1. Furthermore, instead of providing the insulating heat insulating member 19 over the entire length of the insulating tube 1, the insulating heat insulating member 19 made of pipe-shaped asbestos is placed outside the arc extinguishing tube 20 with a slight gap as shown in FIG. do. Further, the insulating heat-insulating member 19 needs to extend at least further in its longitudinal direction than the openings 20a at both ends of the arc-extinguishing tube 20 (to cover the arc-extinguishing tube). The pipe-shaped insulating heat insulating member 19 not only covers the arc extinguishing tube 20 but also extends along the outer peripheral surface near the display storage case 13 where the distance between the inner wall surface 1a of the insulating tube 1 and the silver wire portion 4 is close. Same case 1
3, the high-heat, high-resistance material (commonly called caterpillar) formed by the fuse element 5 and the arc extinguishing agent 6 will be blocked by the same member when the fuse element 5 and the arc extinguisher 6 are cut off, resulting in uneven heat breakdown of the insulating cylinder at the same part. can be prevented.
つまり、絶縁性断熱部材１９は上記したごとく
絶縁筒１の内壁面１ａの全長ａ−ｂ間に設けたり
あるいは消弧チユーブ２０と表示体用収納ケース
１３とが位置するｃ−ｄ間およびｅ−ｂ間の２箇
所に設けるようにする。 That is, as described above, the insulating heat-insulating member 19 is provided between the entire length a and b of the inner wall surface 1a of the insulating cylinder 1, or between c and d where the arc extinguishing tube 20 and display storage case 13 are located, and between e and e. It should be provided at two locations between b.
さて、上記構成のヒユーズにおいて、故障電流
が流れそれが大電流の場合には同ヒユーズのヒユ
ーズエレメントがその全長に亘つて瞬時に発弧し
その発生したアークは消弧剤中に拡散して高抵抗
体物質を生成しこれによつて絶縁回復がなされて
遮断が完了する。そしてこの場合アークと消弧剤
とによつて高熱の高抵抗体物質が生成されるが同
抵抗物質は絶縁性耐熱部材１９によつて絶縁筒の
内壁面への直接接触（到達）が阻止されるため絶
縁筒は局部加熱されず従つて偏熱破壊しない。な
お、この場合ヒユーズエレメント５の溶断と同時
に同電流がヒユーズエレメント５と並列に接続し
た表示用抵抗線９に移行して流れるため、同抵抗
線が続いて溶断しそれによつて常時飛び出し方向
に付勢された表示体１４が表示用バネ１５により
下部カバー１６の表示体用***１６ｃより飛び出
してヒユーズが溶断（遮断）したことを表示す
る。 Now, in the fuse with the above configuration, if a fault current flows and it is a large current, the fuse element of the fuse will instantly arc over its entire length, and the generated arc will diffuse into the arc extinguishing agent and cause a high current. A resistive material is produced, which restores the insulation and completes the interruption. In this case, a high-temperature, high-resistance substance is generated by the arc and the arc extinguisher, but the resistance substance is prevented from directly contacting (reaching) the inner wall surface of the insulating cylinder by the insulating heat-resistant member 19. As a result, the insulating cylinder is not locally heated and therefore does not suffer uneven heat breakdown. In this case, at the same time as the fuse element 5 melts, the same current flows through the display resistance wire 9 connected in parallel with the fuse element 5 , so the resistance wire is subsequently fused and is constantly attached in the pop-out direction. The biased indicator 14 pops out from the indicator hole 16c of the lower cover 16 by the indicator spring 15, indicating that the fuse has blown (cut off).
また表示の際、表示体１４はその係止段部１４
ａが下部カバー１６の係合凹部１６ｂに係止され
て表示体１４はその飛び出し過ぎが防止される。 In addition, when displaying, the display body 14 is
a is locked in the engagement recess 16b of the lower cover 16, and the display body 14 is prevented from protruding too far.
次に故障電流が小さい場合には低融点合金部３
において溶断発弧しそのアークによる熱で同合金
部に被せた消弧チユーブ２０が熱分解して消弧性
ガスを発生させそれによりアークは消弧され遮断
される。なお、表示体は上記同様に突出動作して
ヒユーズが溶断したことを表示する。尚、石綿は
一般に化学組成が3Mg・2SiO2・2H2Oであり、
主体は無機物と水から成つている。 Next, if the fault current is small, the low melting point alloy part 3
The arc extinguishing tube 20 placed over the alloy part is thermally decomposed by the heat generated by the arc to generate arc extinguishing gas, thereby extinguishing the arc and interrupting it. Incidentally, the display body projects in the same manner as above to indicate that the fuse has blown. In addition, asbestos generally has a chemical composition of 3Mg・2SiO 2・2H 2 O,
The main body consists of inorganic matter and water.
そのため、大電流遮断によつてヒユーズエレメ
ントが気化しその周囲に配置された消弧剤が赤熱
（高熱）化して絶縁性断熱部材が高温に晒された
場合にも結晶水の脱水分解が起こるだけである。 Therefore, even if the fuse element vaporizes due to a large current interruption and the arc extinguishing agent placed around it becomes red-hot (high heat) and the insulating heat-insulating member is exposed to high temperatures, dehydration and decomposition of crystalline water will only occur. It is.
このことは石綿が高温化した消弧剤の高熱化を
抑制して同消弧剤による絶縁筒への伝熱阻止を一
段と確実にすることを意味すると同時に分解ガス
の発生がないために絶縁筒の内圧を上昇させない
ことを意味するものである。 This means that asbestos suppresses the high temperature of the arc-extinguishing agent and further ensures that the arc-extinguishing agent prevents heat transfer to the insulating tube. This means that the internal pressure of the unit will not increase.
つまり、石綿を絶縁性断熱部材１９として使用
したことにより、大電流遮断時、絶縁筒を熱的お
よび機械的な破壊から護ることができる。 That is, by using asbestos as the insulating heat-insulating member 19, the insulating cylinder can be protected from thermal and mechanical destruction when a large current is interrupted.
本案は以上の構成からなり、アークエネルギー
が最大となる電流値（定格電流7A〜15A、遮断
電流2000A程度）での遮断、即ち発生したアーク
と充填された消弧剤とによつて生成される高抵抗
体物質が最大の粒径となる場合でも絶縁筒１の内
壁面１ａとヒユーズエレメント５との間に介在す
る石綿の絶縁性断熱部材１９によつてこれら高熱
状態の高抵抗体物質が絶縁筒１の内壁面１ａに直
接接触（到達）するのを阻止できるため、高抵抗
体物質の絶縁筒１に対する伝熱が遮断されて絶縁
筒の偏熱破壊が確実に防止されるようになる。 This project consists of the above configuration, and is interrupted at a current value that maximizes arc energy (rated current 7A to 15A, breaking current approximately 2000A), that is, generated by the generated arc and the arc extinguishing agent filled. Even when the high-resistance material reaches its maximum particle size, the asbestos insulating heat-insulating member 19 interposed between the inner wall surface 1a of the insulating cylinder 1 and the fuse element 5 insulates the high-resistance material in a highly heated state. Since direct contact (reaching) to the inner wall surface 1a of the cylinder 1 can be prevented, heat transfer from the high-resistance material to the insulating cylinder 1 is blocked, and uneven heat breakdown of the insulating cylinder is reliably prevented.
更に巻芯およびヒユーズエレメントとが芯だし
され、絶縁筒の中心に常に正確に位置して収納さ
れるため、細径（内径）の絶縁筒であつても大電
流遮断時に形成される高熱状態の高抵抗物質の絶
縁筒内壁に対する接触が防止され、絶縁筒の局部
過熱による偏熱破壊が防止される。 In addition, the winding core and fuse element are centered and housed in an accurate position at the center of the insulating tube, so even if the insulating tube has a small diameter (inner diameter), it will not absorb the high heat that forms when a large current is cut off. This prevents the high-resistance material from coming into contact with the inner wall of the insulating cylinder, thereby preventing uneven heat breakdown due to local overheating of the insulating cylinder.
なお、この場合絶縁筒の内壁面とヒユーズエレ
メントとの間及び絶縁筒の内壁面と表示体収納ケ
ースとの間に介在する絶縁性断熱部材１９による
絶縁筒の偏熱破壊防止効果も相乗的に作用する。 In this case, the insulating heat-insulating member 19 interposed between the inner wall surface of the insulating tube and the fuse element and between the inner wall surface of the insulating tube and the display storage case also has a synergistic effect of preventing uneven heat breakdown of the insulating tube. act.
第１図は本考案の実施例を示す全領域形高圧カ
ツトアウト用限流ヒユーズの縦断面図、第２図は
ヒユーズエレメントを示す縦断面図、第３図は本
考案の他の実施例を示す縦断面図である。
１……絶縁筒、１ａ……内壁面、１ｂ……絶縁
空間、３……低融点合金部、４……銀線部、５…
…ヒユーズエレメント、６……消弧剤、７……上
部電極、８……下部電極、１３……表示体用収納
ケース、１９……絶縁性断熱部材、２０……消弧
チユーブ。
Fig. 1 is a longitudinal cross-sectional view of a current limiting fuse for full-area high-pressure cutout, showing an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of a fuse element, and Fig. 3 is a longitudinal cross-sectional view of another embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 1... Insulating cylinder, 1a... Inner wall surface, 1b... Insulating space, 3... Low melting point alloy part, 4... Silver wire part, 5 ...
... fuse element, 6 ... arc extinguishing agent, 7 ... upper electrode, 8 ... lower electrode, 13 ... display storage case, 19 ... insulating heat insulating member, 20 ... arc extinguishing tube.
Claims (1)
の低融点合金部３の外周に消弧チユーブ２０を被
せたヒユーズエレメント５を、巻芯の外周にスパ
イラルに巻いて絶縁筒１内に密閉収納しその収納
したエレメント５の両端を絶縁筒１の上下に固着
した上下部両電極７，８にそれぞれ接続しさらに
絶縁筒１の絶縁空間１ｂに消弧剤６を充填しさら
に上記巻芯を、その下端部に表示体用収納ケース
１３を直結延長した全領域型高圧カツトアウト用
限流ヒユーズにおいて、上記ヒユーズエレメント
及び表示体用収納ケース１３と、絶縁筒の内壁面
１ａとの間に介在して、特に石綿からなる絶縁性
断熱部材１９を配設し、かつ、前記巻芯の上端に
固定したガイド金具２２に巻芯の軸心を中心とし
たラツパ状拡開部２２ａを形成し、該拡開部２２
ａの上部電極７に対する係合と前記表示体用収納
ケース１３の絶縁筒１の下端に被着した下部カバ
ー１６の中心に対する係合とによりヒユーズエレ
メント５を絶縁筒１内の中心部に設置させるよう
にしたことを特徴とする全領域形高圧カツトアウ
ト用限流ヒユーズ。 A fuse element 5 in which a low melting point alloy part 3 and a silver wire part 4 are connected in series and an arc extinguishing tube 20 is placed on the outer periphery of the low melting point alloy part 3 is spirally wound around the outer periphery of a winding core and placed inside the insulating cylinder 1. The both ends of the housed element 5 are connected to the upper and lower electrodes 7 and 8 fixed to the upper and lower parts of the insulating tube 1, and the insulating space 1b of the insulating tube 1 is filled with arc extinguishing agent 6, and the above-mentioned winding In the current limiting fuse for full-area high-voltage cut-out in which the core is directly connected and extended to the lower end of the display storage case 13, there is a space between the fuse element and the display storage case 13, and the inner wall surface 1a of the insulating cylinder. An insulating heat insulating member 19 especially made of asbestos is interposed therebetween, and a guide fitting 22 fixed to the upper end of the winding core is formed with a flap-like widening part 22a centered on the axis of the winding core. , the expanded portion 22
The fuse element 5 is installed at the center of the insulating tube 1 by engagement with the upper electrode 7 of a and the center of the lower cover 16 attached to the lower end of the insulating tube 1 of the display storage case 13. A current-limiting fuse for full-area high-voltage cutout, which is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3585281U JPH024436Y2 (en) | 1981-03-13 | 1981-03-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3585281U JPH024436Y2 (en) | 1981-03-13 | 1981-03-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57148747U JPS57148747U (en) | 1982-09-18 |
| JPH024436Y2 true JPH024436Y2 (en) | 1990-02-01 |
Family
ID=29833104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3585281U Expired JPH024436Y2 (en) | 1981-03-13 | 1981-03-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH024436Y2 (en) |
-
1981
- 1981-03-13 JP JP3585281U patent/JPH024436Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57148747U (en) | 1982-09-18 |
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