JPH0224186Y2 - - Google Patents
Info
- Publication number
- JPH0224186Y2 JPH0224186Y2 JP1982025404U JP2540482U JPH0224186Y2 JP H0224186 Y2 JPH0224186 Y2 JP H0224186Y2 JP 1982025404 U JP1982025404 U JP 1982025404U JP 2540482 U JP2540482 U JP 2540482U JP H0224186 Y2 JPH0224186 Y2 JP H0224186Y2
- Authority
- JP
- Japan
- Prior art keywords
- switch
- outer box
- lightning arrester
- grounding
- arrester
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Description
【考案の詳細な説明】
〔考案の技術分野〕
本考案は、例えば配電線用として良好に適用し
得る避雷器内蔵開閉器に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a switch with a built-in lightning arrester that can be suitably applied, for example, to power distribution lines.
架空配電線路用避雷器の一般的な配置・構成
を、第１図を参照して説明する。第１図の架空配
電線路においては、電柱１に腕金２が水平に取り
付けられ、腕金２の上に各相別の避雷器３が互い
に所定の絶縁距離をとつて配設されている。腕金
２にはその下方に開閉器４も吊下げられている。
避雷器３の高圧端子はリード線５を介して配電線
６に接続され、避雷器３の接地端子は接地線７を
介していつたん開閉器４の接地端子４ａに接続さ
れ、ここから改めて、電柱１の中を通つている接
地線８に接地線９を介して接続することにより所
期の接地を達成している。
The general arrangement and configuration of lightning arresters for overhead power distribution lines will be explained with reference to FIG. 1. In the overhead power distribution line shown in FIG. 1, an arm 2 is horizontally attached to a utility pole 1, and lightning arresters 3 for each phase are arranged on the arm 2 at a predetermined insulating distance from each other. A switch 4 is also suspended below the armrest 2.
The high-voltage terminal of the lightning arrester 3 is connected to the distribution line 6 via the lead wire 5, and the ground terminal of the lightning arrester 3 is connected via the ground wire 7 to the ground terminal 4a of the switch 4, and from there, the power pole 1 The desired grounding is achieved by connecting via a grounding wire 9 to the grounding wire 8 passing through the inside of the grounding wire.
一方、次のような理由から避雷器を開閉器に内
蔵することが検討されている。すなわち、避雷器
を開閉器に内蔵することにより、
(1) 避雷器を電柱に取付ける作業を省くことがで
き、装柱の簡素化を図ることができる。 On the other hand, it is being considered to incorporate lightning arresters into switches for the following reasons. That is, by incorporating the lightning arrester into the switch, (1) the work of installing the lightning arrester on the utility pole can be omitted, and the installation of the lightning arrester on the pole can be simplified.
(2) 開閉器が密閉型である場合、避雷器の弱点で
ある気密に対しても保護することができる。(2) If the switch is a sealed type, it can also be protected against airtightness, which is the weak point of lightning arresters.
(3) 避雷器の碍管寸法はその汚損特性で決まる
が、開閉器に内蔵された避雷器の耐汚損特性は
開閉器が負担することになるので、避雷器の小
型化を図ることができる。(3) The size of the lightning arrester's insulator is determined by its fouling characteristics, but since the switch is responsible for the fouling resistance of the surge arrester built into the switch, it is possible to downsize the surge arrester.
等の理由がそれである。This is the reason why.
しかるに、避雷器を開閉器に内蔵する場合、開
閉器のスペース上の問題や絶縁耐力の問題などか
ら、避雷器の接地線を開閉器の接地端子に直接接
続することは不可能である場合が多い。例えば第
２図に示すように、開閉器４の主接点４ｂは空間
的に開閉器外箱内のほぼ中央部に、また接地端子
４ａは開閉器外箱外面の上半部に、さらに避雷器
３は開閉器外箱内の下半部にそれぞれ設けるよう
にするのが一般的であるが、その場合、避雷器３
のための接地線７は接地端子４ａから離れた開閉
器外箱の底面部に接続される場合が多い。 However, when a lightning arrester is built into a switch, it is often impossible to connect the grounding wire of the lightning arrester directly to the ground terminal of the switch due to space issues and dielectric strength issues of the switch. For example, as shown in FIG. 2, the main contact 4b of the switch 4 is spatially located approximately in the center of the switch outer box, the ground terminal 4a is located in the upper half of the outer surface of the switch outer box, and the lightning arrester 3 It is common to install them in the lower half of the switch outer box, but in that case, the lightning arrester 3
The grounding wire 7 is often connected to the bottom of the switch outer box, which is remote from the grounding terminal 4a.
従来の避雷器付き開閉器においては、避雷器３
に大電流が流れた場合、充電部と接地端子４ａと
の間に、避雷器３の制限電圧V1と、開閉器外箱
内における避雷器接地線の取付点および接地端子
４ａ間の抵抗Ｒと避雷器電流Ｉとの積RIに相当
する電圧V2との和の電圧V0＝V1＋V2が加わるこ
とになる。ここで抵抗Ｒも電流Ｉもかなり大きい
値を持つているので、V2＝RIは無視し得ないの
である。しかるに、充電部と開閉器外箱との間の
絶縁耐力が電圧V0＝V1＋V2よりも低いと開閉器
外箱で内部閃絡が生じることになる。
In the conventional switch with lightning arrester, lightning arrester 3
When a large current flows between the live part and the grounding terminal 4a, the limiting voltage V1 of the lightning arrester 3, the resistance R between the attachment point of the lightning arrester grounding wire in the switch outer box and the grounding terminal 4a, and the lightning arrester A voltage V 0 =V 1 +V 2 which is the sum of the voltage V 2 corresponding to the product RI with the current I is added. Here, since both the resistance R and the current I have fairly large values, V 2 =RI cannot be ignored. However, if the dielectric strength between the live part and the switch outer box is lower than the voltage V 0 =V 1 +V 2 , an internal flash fault will occur in the switch outer box.
このような不都合を回避するために避雷器接地
端子を、通常のリード線を介して開閉器外箱に設
けられている接地端子に接続することも考えられ
るが、その抵抗低減効果はあまり期待することが
できない。例えば、開閉器外箱の材料として多く
用いられる鉄の抵抗率を約10μΩ・cm、接地用リ
ード線の抵抗率を仮に1.7μΩ・cmすなわち鉄の約
１／６であるとして、通常は接地用リード線の実効
断面積は開閉器外箱の実効断面積（避雷器電流が
流れる部分の実効断面積）のせいぜい百分の一程
度であり、したがつて両者の概算の避雷器電流通
路の合成抵抗R0は、開閉器外箱の抵抗をR1、接
地用リード線の抵抗をR2として、
R0＝１／（１／R1＋１／R2）≒１／（１／R1
＋６／（100・R1））≒0.94R1
であつて、大した抵抗低減効果を期待することは
できない。 In order to avoid such inconvenience, it is possible to connect the lightning arrester grounding terminal to the grounding terminal provided on the switch outer box via a normal lead wire, but do not expect much resistance reduction effect. I can't. For example, if we assume that the resistivity of iron, which is often used as a material for switchgear outer boxes, is approximately 10μΩ・cm, and that the resistivity of the grounding lead wire is 1.7μΩ・cm, or approximately 1/6 that of iron, then The effective cross-sectional area of the lead wire is at most one hundredth of the effective cross-sectional area of the switch outer box (the effective cross-sectional area of the part where the arrester current flows), and therefore the combined resistance R of the arrester current path is approximately 0 is the resistance of the switch outer box as R 1 and the resistance of the grounding lead wire as R 2 , R 0 = 1/(1/R 1 +1/R 2 ) ≒ 1/(1/R 1
+6/(100·R 1 ))≒0.94R 1 , and no significant resistance reduction effect can be expected.
したがつて本考案の目的は、避雷器電流が流れ
た場合であつても、できるだけ内部閃絡を生じな
い高信頼性の避雷器内蔵開閉器を提供することに
ある。
Therefore, it is an object of the present invention to provide a highly reliable switch with a built-in surge arrester that does not cause internal flash faults as much as possible even when the surge arrester current flows.
上記目的を達成するために本考案は、開閉器接
地端子を有する開閉器外箱内に開閉器主接点と避
雷器を収納した避雷器内蔵開閉器において、開閉
器外箱の、少なくとも避雷器の接地端子近傍と開
閉器接地端子との間に、開閉器外箱の実効断面積
と同等以上の実効断面積を有する導電板を裏張り
し、避雷器の高圧端子はリード線を介して開閉器
主接点に接続し、避雷器接地端子は導電板の最寄
り箇所に最短の接地線を介して接続したことを特
徴とする。
In order to achieve the above object, the present invention provides a switch with a built-in surge arrester in which a switch main contact and a lightning arrester are housed in a switch outer box having a switch ground terminal, at least near the ground terminal of the surge arrester. A conductive plate with an effective cross-sectional area equal to or greater than the effective cross-sectional area of the switch outer box is lined between the switch and the switch grounding terminal, and the high-voltage terminal of the lightning arrester is connected to the switch main contact via a lead wire. However, the lightning arrester grounding terminal is connected to the nearest point of the conductive plate via the shortest grounding wire.
上記構成によれば、外箱の避雷器接地点と開閉
器接地端子との間の実効抵抗をほとんど無視する
ことができ、したがつて、前記電圧V2をほぼゼ
ロにすることができる。この構成は、避雷器の接
地点と開閉器接地端子とが多少離れているような
場合に特に顕著な効果を発揮することができる。 According to the above configuration, the effective resistance between the lightning arrester grounding point of the outer box and the switch grounding terminal can be almost ignored, and therefore the voltage V 2 can be made almost zero. This configuration can exhibit a particularly remarkable effect when the grounding point of the lightning arrester and the switch grounding terminal are somewhat apart.
第３図は本考案の一実施例を示すものである。
電柱１に水平に取付けられた腕金２に吊金具１０
を介して開閉器４、例えば区分開閉器が吊下げら
れている。開閉器４の外箱４ｃの中には、そのほ
ぼ中央部に位置するように主接点４ｂが、また下
半部に位置するように避雷器３がそれぞれ収納さ
れている。開閉器の接地端子４ａは外箱４ｃの上
部に設けられている。外箱４ｃ内には、少なくと
も避雷器３の接地最寄り箇所と開閉器４の接地端
子４ａとの間に導電板１１、例えば銅板が裏張り
されている。導電板１１の実効断面積は、開閉器
外箱４ｃの実効断面積と比較し、それと同等以上
にするものとする。開閉器の接地端子４ａは電柱
１の中を通つている接地線８に接地線９を介して
接続されている。
FIG. 3 shows an embodiment of the present invention.
A hanging bracket 10 is attached to an armrest 2 horizontally attached to a telephone pole 1.
A switch 4, for example a section switch, is suspended via the. Inside the outer box 4c of the switch 4, a main contact 4b is housed approximately in the center thereof, and a lightning arrester 3 is housed in the lower half thereof. A ground terminal 4a of the switch is provided at the top of the outer box 4c. Inside the outer box 4c, a conductive plate 11, for example a copper plate, is lined between at least the grounding point of the lightning arrester 3 and the grounding terminal 4a of the switch 4. The effective cross-sectional area of the conductive plate 11 is compared with the effective cross-sectional area of the switch outer box 4c, and is set to be equal to or greater than the effective cross-sectional area of the switch outer box 4c. A grounding terminal 4a of the switch is connected to a grounding wire 8 passing through the utility pole 1 via a grounding wire 9.
避雷器３の高圧端子は外箱４ｃ内においてリー
ド線５を介して開閉器主接点４ｂすなわち配電線
に最短距離で接続され、避雷器３の接地端子は接
地線７を介して導電板１１にその最寄り箇所で同
様に最短距離で接続されている。 The high-voltage terminal of the lightning arrester 3 is connected to the switch main contact 4b, that is, the distribution line, via the lead wire 5 in the outer box 4c at the shortest distance, and the grounding terminal of the lightning arrester 3 is connected to the conductive plate 11 via the grounding wire 7 at the shortest distance. Similarly, they are connected at the shortest distance at each point.
開閉器外箱４ｃの材料として一般的に多く使用
されている鉄の抵抗率は既に述べたように約
10μΩ・cmであるのに対し、導電板１１として用
いられる銅のそれは約1.7μΩ・cmであつて、鉄の
約1/6である。 As already mentioned, the resistivity of iron, which is commonly used as a material for the switch outer box 4c, is approximately
10 μΩ·cm, whereas that of copper used as the conductive plate 11 is about 1.7 μΩ·cm, which is about 1/6 that of iron.
第３図の装置において、避雷器電流通路の等価
回路は第５図で表される。つまり、配電線６で代
表される充電部と大地１２で代表される接地端子
４ａとの間に、避雷器３と開閉器外箱４ｃの抵抗
R1とが直列に接続され、さらに抵抗R1に、導電
板１１の抵抗R2が並列に接続された結果となつ
ている。両抵抗R1，R2の合成抵抗R0は、周知の
ごとく、
R0＝１／（１／R1＋１／R2）
であるから、避雷器電流通路において導電板１１
の実効断面積を外箱４ｃの実効断面積と同等もし
くはそれ以上に選定すれば、抵抗R0として主と
して導電板１１の抵抗R2のみが効いてきて、外
箱４ｃの抵抗R1はほとんど無視し得るようにな
る。 In the device of FIG. 3, the equivalent circuit of the arrester current path is shown in FIG. In other words, between the live part represented by the distribution line 6 and the ground terminal 4a represented by the earth 12, the resistance of the lightning arrester 3 and the switch outer box 4c is
This results in that the resistor R 1 is connected in series, and the resistor R 2 of the conductive plate 11 is connected in parallel to the resistor R 1 . As is well known, the combined resistance R 0 of both resistances R 1 and R 2 is R 0 = 1/(1/R 1 + 1/R 2 ).
If the effective cross-sectional area of is selected to be equal to or greater than the effective cross-sectional area of the outer box 4c, only the resistance R2 of the conductive plate 11 becomes effective as the resistance R0 , and the resistance R1 of the outer box 4c is almost ignored. become able to do so.
因みに開閉器外箱４ｃと導電板１１の実効断面
積が同等であり、しかも導電板１１として銅板を
用いるものとすれば、鉄と銅の抵抗率は前述の通
りであるから、R1≒6R2であり、
R0＝１／（１／R1＋１／R2）≒１／｛１／
（6R2）＋１／R2｝＝6R2／７
であつて、実際上、外箱４ｃの抵抗R1を無視し、
導電板１１の抵抗R2のみで議論可能であること
が分かる。 Incidentally, if the effective cross-sectional areas of the switch outer box 4c and the conductive plate 11 are the same, and if a copper plate is used as the conductive plate 11, the resistivity of iron and copper is as described above, so R 1 ≒ 6R. 2 , and R 0 = 1/(1/R 1 + 1/R 2 )≒1/{1/
(6R 2 )+1/R 2 }=6R 2 /7, and in practice, ignoring the resistance R 1 of the outer box 4c,
It can be seen that the discussion can be made using only the resistance R 2 of the conductive plate 11.
このようにして、設計上、開閉器接地端子４ａ
と接地線７の外箱４ｃに対する接続点が多少離れ
ていても、それによる外箱の抵抗分（R1）をほ
とんど無視し得る程度にすることができる。 In this way, due to the design, the switch ground terminal 4a
Even if the connection point of the ground wire 7 and the outer box 4c is somewhat apart, the resulting resistance (R 1 ) of the outer box can be made almost negligible.
導電板１１をアルミニウム等の他の導電材料で
構成しても同等の効果を奏することは明らかであ
り、さらに、この導電板１１に外箱４ｃの機械的
な補強手段を兼ねさせてもよい。 It is clear that the same effect can be achieved even if the conductive plate 11 is made of other conductive material such as aluminum, and furthermore, the conductive plate 11 may also serve as a mechanical reinforcing means for the outer box 4c.
以上述べたように本考案によれば、避雷器電流
が流れた時の開閉器外箱の内部抵抗による電圧降
下をほとんど無視し得る程度に低減し、その分だ
け充電部と開閉器接地端子との間の電圧を低く抑
えることができるので、避雷器電流が流れた場合
であつても、内部閃絡を生じ難いものとし、本来
の避雷器性能を良好に発揮させ、信頼性の高い避
雷器内蔵開閉器を提供することができる。
As described above, according to the present invention, the voltage drop due to the internal resistance of the switch outer box when the arrester current flows is reduced to an almost negligible level, and the voltage drop between the live part and the switch ground terminal is reduced by that amount. Since the voltage between the terminals can be suppressed to a low level, even if the arrester current flows, it is difficult to cause internal flash faults, and the original performance of the arrester can be demonstrated well, making it possible to create a highly reliable switch with a built-in arrester. can be provided.
第１図は架空配電線路に設けられた従来の開閉
器および避雷器の配電状態を示す斜視図、第２図
は従来検討されている避雷器内蔵開閉器の内部構
成を示す説明図、第３図は本考案の一実施例を示
す配置構成図、第４図は第３図の装置における避
雷器電流通路の等価回路図である。
３……避雷器、４……開閉器、４ａ……接地端
子、４ｂ……主接点、４ｃ……外箱、５……リー
ド線、７……接地線、１１……導電板。
Fig. 1 is a perspective view showing the power distribution state of a conventional switch and lightning arrester installed on an overhead power distribution line, Fig. 2 is an explanatory diagram showing the internal configuration of a conventional switch with a built-in lightning arrester, and Fig. 3 is FIG. 4 is a layout diagram showing one embodiment of the present invention, and FIG. 4 is an equivalent circuit diagram of the lightning arrester current path in the device of FIG. 3. 3... Lightning arrester, 4... Switch, 4a... Grounding terminal, 4b... Main contact, 4c... Outer box, 5... Lead wire, 7... Grounding wire, 11... Conductive plate.
Claims (1)
主接点と避雷器を収納した避雷器内蔵開閉器にお
いて、 前記開閉器外箱の、少なくとも前記避雷器の接
地端子近傍と前記開閉器接地端子との間に、前記
開閉器外箱の実効断面積と同等以上の実効断面積
を有する導電板を裏張りし、前記避雷器の接地端
子はリード線を介して前記開閉器主接点に接続
し、前記避雷器の接地端子は前記導電板の最寄り
箇所に最短の接地線を介して接続したことを特徴
とする避雷器内蔵開閉器。[Scope of Claim for Utility Model Registration] In a switch with a built-in surge arrester in which a switch main contact and a lightning arrester are housed in a switch outer box having a switch grounding terminal, at least the vicinity of the grounding terminal of the surge arrester in the switch outer box A conductive plate having an effective cross-sectional area equal to or larger than the effective cross-sectional area of the switch outer box is lined between the switch ground terminal and the switch main A switch with a built-in lightning arrester, characterized in that the grounding terminal of the lightning arrester is connected to the nearest point of the conductive plate via the shortest grounding wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2540482U JPS58128531U (en) | 1982-02-24 | 1982-02-24 | Switch with built-in lightning arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2540482U JPS58128531U (en) | 1982-02-24 | 1982-02-24 | Switch with built-in lightning arrester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58128531U JPS58128531U (en) | 1983-08-31 |
| JPH0224186Y2 true JPH0224186Y2 (en) | 1990-07-03 |
Family
ID=30037372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2540482U Granted JPS58128531U (en) | 1982-02-24 | 1982-02-24 | Switch with built-in lightning arrester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58128531U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS588822B2 (en) * | 1980-08-26 | 1983-02-17 | 株式会社 備文 | Protein recovery equipment for meat bleaching waste liquid |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6331468Y2 (en) * | 1979-12-25 | 1988-08-23 | ||
| JPS588822U (en) * | 1981-07-13 | 1983-01-20 | 株式会社三英社製作所 | Switchgear with lightning arrester |
-
1982
- 1982-02-24 JP JP2540482U patent/JPS58128531U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS588822B2 (en) * | 1980-08-26 | 1983-02-17 | 株式会社 備文 | Protein recovery equipment for meat bleaching waste liquid |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58128531U (en) | 1983-08-31 |
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