JPH0677031B2 - Voltage detector - Google Patents
Voltage detectorInfo
- Publication number
- JPH0677031B2 JPH0677031B2 JP61050996A JP5099686A JPH0677031B2 JP H0677031 B2 JPH0677031 B2 JP H0677031B2 JP 61050996 A JP61050996 A JP 61050996A JP 5099686 A JP5099686 A JP 5099686A JP H0677031 B2 JPH0677031 B2 JP H0677031B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- refractive index
- clad
- liquid crystal
- electric field
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は送電線、高電圧機器等に電圧がかかっているか
どうかをチェックする検電器に係わる。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a voltage detector for checking whether or not a voltage is applied to a power transmission line, a high voltage device or the like.
［従来技術］ 従来、送配電線、高電圧機器等に電圧がかかっているか
否かを検出する機器として第３図（イ）、（ロ）に示す
ような検電器が用いられている。[Prior Art] Conventionally, as a device for detecting whether or not a voltage is applied to a transmission and distribution line, a high-voltage device, etc., a voltage detector as shown in Fig. 3 (a) and (b) has been used.
（イ）図はコロナ風車式検電器といわれるものであっ
て、21は電極、22はアルミ箔等よりなる風車であり、23
は把手である。電界中に電極21が入ることにより、風車
22はエッジでコロナ放電を生じて回転し、これによって
電界の有無を検出するものである。(A) The figure shows what is called a corona wind turbine type voltage detector, where 21 is an electrode, 22 is a wind turbine made of aluminum foil, and 23
Is a handle. By inserting the electrode 21 into the electric field,
Reference numeral 22 is for detecting the presence or absence of an electric field by causing corona discharge at the edge and rotating.
（ロ）図において、24はネオン管で、これに高圧電極2
5、低圧電極26が接続され、高圧電極25が電界中にある
ことによって点灯し、電界の有無を検出するものであ
る。In Fig. (B), 24 is a neon tube, to which the high voltage electrode 2
5. The low-voltage electrode 26 is connected, and the high-voltage electrode 25 is turned on when it is in the electric field, and the presence or absence of the electric field is detected.
ところが、これらの検電器は検出部に金属部分を有し、
場合により全路破壊に至る危険性がある。However, these electroscopes have a metal part in the detection part,
In some cases, there is a risk of destruction of the entire road.
［発明の目的．構成］ 本発明は上述のような検電器構成中に全く金属部分を含
まない検電器を得ることを目的とするものであり、液晶
および光ファイバの巧みな組合せによって検電器を得よ
うとするものである。[Object of the invention. Configuration] The present invention is intended to obtain a voltage detector which does not include any metal part in the voltage detector structure as described above, and intends to obtain a voltage detector by a skillful combination of a liquid crystal and an optical fiber. Is.
光ファイバは、通常コアの屈折率がクラッドより高く、
コア中を進む光は、クラッドとの界面で反射して、コア
の中に閉じ込められた状態で伝搬される。The optical fiber usually has a higher refractive index in the core than in the cladding,
The light traveling in the core is reflected at the interface with the cladding and propagates while being confined in the core.
いま、クラッドに、屈折率が電界の強さで上る液晶を用
いれば、電界によってコアとクラッドの屈折率差が反転
し、液晶をクラッドとした部分で光がクラッド側に漏れ
る形となる。If a liquid crystal whose refractive index rises due to the strength of an electric field is used for the clad, the electric field inverts the refractive index difference between the core and the clad, and the light leaks to the clad side at the portion where the liquid crystal is the clad.
従って、光ファイバの一部分のクラッドを除去し、この
ような特性の液晶と置きかえることにより、その部分に
電界が加わるとコア外部からもれる光を観察することが
できる。Therefore, by removing the cladding of a part of the optical fiber and replacing it with a liquid crystal having such characteristics, it is possible to observe the light leaked from the outside of the core when an electric field is applied to that part.
用いる液晶は、電界による屈折率変化が大きいものがよ
い。このような液晶は、分子の長軸方向の屈折率ｎ と
分子の長軸方向と垂直方向の屈折率ｎ⊥の差Δｎが大き
いものである。The liquid crystal used should have a large change in refractive index due to an electric field.
Yes. Such a liquid crystal has a refractive index n in the long axis direction of the molecule. When
Refractive index n in the direction perpendicular to the long axis of the molecule⊥Difference Δn is large
It is a good thing.
又、用いる液晶の屈折率ｎ 又はｎ⊥のいずれか小さい
方の屈折率値は、小くとも用いる光ファイバのコアの屈
折率より小さいものでなくてはならず、より好ましくは
用いる光ファイバのクラッドの屈折率より小さいもので
ある。Also, the refractive index n of the liquid crystal used Or n⊥Whichever is smaller
The refractive index value of
It must be smaller than the folding rate, and more preferably
It has a smaller refractive index than the cladding of the optical fiber used.
is there.
このような例として、コアがポリメチルメタアクリレー
ト（屈折率1.49）、クラッドがフッ化ビニリデンとテト
ラフルオロエチレン共重合体（屈折率1.42）とからなる
プラスチック光ファイバを用いる場合、液晶として、例
えば、ネマティック液晶（メルク社、商品名ZL1-2848、
屈折率ｎ ＝1.56、ｎ⊥＝1.47）を用いることができ
る。An example of this is when the core is polymethylmethacrylate.
(Refractive index 1.49), clad with vinylidene fluoride and tet
Composed of Lafluoroethylene copolymer (refractive index 1.42)
When using a plastic optical fiber, an example of liquid crystal
For example, nematic LCD (Merck, trade name ZL1-2848,
Refractive index n = 1.56, n⊥= 1.47) can be used
It
第２図（イ）は、コアの屈折率をn1とし、液晶の屈折率
をn2として、n1＜n2のときの光の伝搬状態を示し、同
（ロ）はn1＜n2のときの光の伝搬状態を示す。Figure 2 (b) is a refractive index of the core and n 1, the refractive index of the liquid crystal as n 2, n 1 indicates the propagation state of light when the <n 2, the (B) is n 1 <n The propagation state of light at 2 is shown.
上述の説明は、正規の光ファイバのクラッドではクラッ
ド中を伝搬する光は存在しないということで説明したも
のであるが、実際に作られたものでは、クラッド部分を
も伝搬する光が存在するので、正規の光ファイバのクラ
ッド外側に、前述の液晶を配しても、電界の存在によっ
て光を外部に漏らすことができる。The above explanation is based on the fact that there is no light propagating in the clad in a regular optical fiber clad, but in an actually made clad, there is light propagating in the clad part as well. Even if the above-mentioned liquid crystal is provided outside the clad of a regular optical fiber, light can be leaked to the outside due to the presence of an electric field.
本発明は、上述の説明のように、電界が存在しないと
き、屈折率がコア、クラッドよりなる正規の光ファイバ
のコア又はクラッドのそれよりも低く、電界が存在する
とき、屈折率がコアのそれより高くなる特性を有する液
晶で、クラッドの一部を置き換えるか、クラッド外周に
配して、光の伝搬中、これら液晶部分より漏れる光によ
り電界の強さを検出するものである。As described above, the present invention has a refractive index lower than that of a core or a clad of a regular optical fiber composed of a core and a clad in the absence of an electric field, and a refractive index of the core in the presence of an electric field. A part of the clad is replaced with a liquid crystal having a characteristic higher than that, or the clad is arranged on the outer periphery of the clad, and the intensity of the electric field is detected by the light leaking from these liquid crystal parts during the propagation of the light.
以下、第１図に示す実施例により本発明を説明する。The present invention will be described below with reference to the embodiment shown in FIG.
図において、１は石英ガラス製又はプラスチック製光フ
ァイバである。Ｃは光ファイバ１の一部と液晶を封入す
る絶縁容器であり、２は絶縁樹脂製の枠状スペーサであ
り、両面は透明なガラス板３よりなり、絶縁樹脂製の蓋
４で密封できるように形成されている。In the figure, 1 is an optical fiber made of quartz glass or plastic. C is an insulating container for enclosing a part of the optical fiber 1 and liquid crystal, 2 is a frame spacer made of an insulating resin, both surfaces of which are made of transparent glass plates 3, and can be sealed with a lid 4 made of an insulating resin. Is formed in.
前記光ファイバ１を、その終端又は中間でスペーサ２内
に挿入し、光ファイバ１を囲んで液晶５を充填して蓋４
を閉じる。６はHe-Neレーザであり、光ファイバ１の端
面より光ファイバ１内に光を投射される。またレーザ６
にかえ、E/0素子を用いる場合もある。The optical fiber 1 is inserted into the spacer 2 at the end or the middle thereof, and the optical fiber 1 is surrounded to fill the liquid crystal 5 with the lid 4
Close. A He-Ne laser 6 projects light into the optical fiber 1 from the end face of the optical fiber 1. Also laser 6
Instead, an E / 0 element may be used.
すでに説明したが、光ファイバは、正規のコアの屈折率
に対してクラッドのそれが低いものとし、このクラッド
を剥いでコアを露出させて、液晶中に入れるか、クラッ
ドをかぶせたままで、液晶中に入れてもよい。As already explained, it is assumed that the clad has a lower refractive index than the regular core, and the clad is peeled off to expose the core, and the core is placed in the liquid crystal or the clad is covered with the liquid crystal. You can put it inside.
液晶は電界のない場合、その屈折率はコア、又はクラッ
ドのよれよりも低く、電界のある場合は、コアのそれよ
り高くなるように変化するものが使用される。The liquid crystal has a refractive index lower than that of the core or the clad in the absence of an electric field, and is higher than that of the core in the presence of an electric field.
なお実際に使用する検電器としては、例えば、上記液晶
密封による検出部分を絶縁樹脂製の支持体で支持し、こ
の支持体中に光ファイバを挿通させ、支持体端末部もし
くは別にレーザを取付けるように構成すればよい。As for the electroscope to be actually used, for example, the detection part by the liquid crystal sealing is supported by a support made of insulating resin, an optical fiber is inserted into this support, and a laser is attached to the end of the support or another laser. Can be configured as.
［効果］ 以上説明のように、本発明の検電器においては、本質的
に、全く金属部分なく構成することができ、高電圧の加
わっている送電線、電気機器、変電所等で、当該機器又
は線路等が停止しているか、運転中であるか安全且簡単
に検出することができる。[Effects] As described above, the voltage detector of the present invention can be configured essentially without any metal part, and can be used in high-voltage transmission lines, electric devices, substations, and the like. Alternatively, it can be safely and easily detected whether the track or the like is stopped or in operation.
第１図は本発明の実施例を示す。 第２図（イ）、（ロ）は本発明原理説明図である。 第３図（イ）は風車回転型の検電器を示し、同（ロ）は
ネオン検電器を示す。 １……光ファイバ、２……スペーサ、３……ガラス板、
４……蓋、５……液晶、６……レーザ、Ｃ……容器。FIG. 1 shows an embodiment of the present invention. 2 (a) and 2 (b) are explanatory views of the principle of the present invention. FIG. 3 (a) shows a wind turbine rotary type voltage detector, and FIG. 3 (b) shows a neon voltage detector. 1 ... Optical fiber, 2 ... Spacer, 3 ... Glass plate,
4 ... Lid, 5 ... Liquid crystal, 6 ... Laser, C ... Container.
Claims (1)
バを囲んで、電界がない場合は、屈折率が前記光ファイ
バのコア又はクラッドのそれより小さく、電界がある場
合は、屈折率がコアのそれより大きくなる液晶を充填
し、前記光ファイバを伝搬する光の漏光により電界を検
出することを特徴とする検電器。1. An insulating container having a transparent portion, which surrounds an optical fiber, has a refractive index smaller than that of the core or clad of the optical fiber when there is no electric field, and has a refractive index when there is an electric field. A voltage detector filled with a liquid crystal larger than that of a core, and detecting an electric field by leaking light propagating through the optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61050996A JPH0677031B2 (en) | 1986-03-07 | 1986-03-07 | Voltage detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61050996A JPH0677031B2 (en) | 1986-03-07 | 1986-03-07 | Voltage detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62254059A JPS62254059A (en) | 1987-11-05 |
| JPH0677031B2 true JPH0677031B2 (en) | 1994-09-28 |
Family
ID=12874395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61050996A Expired - Lifetime JPH0677031B2 (en) | 1986-03-07 | 1986-03-07 | Voltage detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0677031B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9093867B2 (en) | 2011-09-23 | 2015-07-28 | Eaton Corporation | Power system including an electret for a power bus |
| US8791831B2 (en) | 2011-09-23 | 2014-07-29 | Eaton Corporation | System including an indicator responsive to an electret for a power bus |
-
1986
- 1986-03-07 JP JP61050996A patent/JPH0677031B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62254059A (en) | 1987-11-05 |
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