JPH08136588A - Optical voltage sensor - Google Patents
Optical voltage sensorInfo
- Publication number
- JPH08136588A JPH08136588A JP6279124A JP27912494A JPH08136588A JP H08136588 A JPH08136588 A JP H08136588A JP 6279124 A JP6279124 A JP 6279124A JP 27912494 A JP27912494 A JP 27912494A JP H08136588 A JPH08136588 A JP H08136588A
- Authority
- JP
- Japan
- Prior art keywords
- electro
- optical
- optical element
- voltage sensor
- light
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 230000035945 sensitivity Effects 0.000 abstract description 10
- 230000005855 radiation Effects 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 239000013078 crystal Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は高圧配電線などの電圧状
態を監視するために用いる光電圧センサに関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical voltage sensor used for monitoring a voltage condition of a high voltage distribution line or the like.
【０００２】[0002]
【従来の技術】近年配電の自動化、高信頼化、高付加価
値化の時代のニーズに応えるべく各電力会社において配
電線の事故点を検出する事故点評定システムの開発が行
われている。この中で、従来、電気式の電流、電圧セン
サ（変流、変圧器）が用いられてきたが、地絡等の事故
をセンサ自身の設置によって誘発しないようにその絶縁
性、信頼性を保つべくさまざまの改良が行われてきた
が、その結果として装置が大がかりになる、大きな設置
面積を必要とする、そしてコスト高になる等の問題を生
じている。2. Description of the Related Art In recent years, each electric power company has developed an accident point evaluation system for detecting an accident point of a distribution line in order to meet the needs of the times of automation, high reliability, and high added value of power distribution. Among these, electric current and voltage sensors (current transformers, transformers) have been used in the past, but their insulation and reliability are maintained so that accidents such as ground faults are not triggered by the installation of the sensor itself. Although various improvements have been made to this end, problems such as a large scale of the device, a large installation area, and a high cost have arisen as a result.
【０００３】そこで、この問題を解決すべく磁気光学素
子、電気光学素子を用いた光電流、電圧センサによる事
故点評定システムが開示されている（芹沢、電気評論１
９９２．３参照）。Therefore, in order to solve this problem, an accident point evaluation system using a photocurrent and voltage sensor using a magneto-optical element and an electro-optical element has been disclosed (Serizawa, Electric Review 1).
992.3).
【０００４】以下に、従来の光電圧センサについて説明
する。図４は従来の光電圧センサの構成を示すものであ
る。また、図５は光電圧センサの検出原理を示した模式
図である。１は偏光子、２は電気光学素子であるＬｉＮ
ｂ1-XＴａXＯ3（０≦Ｘ≦１）単結晶、３は１／４波長
板、４は検光子、６は電気光学素子２に電圧を印加する
ためのリード線、７はレンズ、８はフェルール、９は光
ファイバ、１０はレンズホルダーである。一方の光ファ
イバ９、フェルール８、レンズ７を通して通ってくる入
射光は偏光子１によって１偏光成分のみ直線に偏光さ
れ、１／４波長板３によって円偏光に変換される。この
円偏光は電気光学素子２を通過する。電気光学素子２を
通過した光は偏光子１と同一透過偏向方向を持つように
配された検光子４を通し、他方のレンズ７、フェルール
８、光ファイバ９を通して取出される。A conventional optical voltage sensor will be described below. FIG. 4 shows the configuration of a conventional optical voltage sensor. FIG. 5 is a schematic diagram showing the detection principle of the optical voltage sensor. 1 is a polarizer, 2 is an electro-optical element LiN
b 1-X Ta X O 3 (0 ≦ X ≦ 1) single crystal, 3/4 wavelength plate, 4 analyzer, 6 lead wire for applying voltage to electro-optical element 2, 7 lens , 8 is a ferrule, 9 is an optical fiber, and 10 is a lens holder. The incident light passing through one of the optical fiber 9, the ferrule 8 and the lens 7 is linearly polarized by the polarizer 1 with only one polarization component, and is converted into circularly polarized light by the quarter wavelength plate 3. This circularly polarized light passes through the electro-optical element 2. The light that has passed through the electro-optical element 2 passes through an analyzer 4 arranged so as to have the same transmission deflection direction as the polarizer 1, and is extracted through the other lens 7, ferrule 8, and optical fiber 9.
【０００５】このとき、電気光学素子２は、屈折率ｎが
印加された電圧に比例して変化する現象を有する（電気
光学効果）。At this time, the electro-optical element 2 has a phenomenon in which the refractive index n changes in proportion to the applied voltage (electro-optical effect).
【０００６】[0006]
【外１】 [Outside 1]
【０００７】ここで、Δｎは屈折率の変化量、ｎ0は電
気光学素子の屈折率、ｒは電気光学係数、Ｅは印加電圧
である。Here, Δn is the amount of change in the refractive index, n 0 is the refractive index of the electro-optical element, r is the electro-optical coefficient, and E is the applied voltage.
【０００８】電気光学素子２にリード線６を通して電圧
が印加されていないときは、円偏光は電気光学素子２を
素通りし検光子４を１／２の光量が通過する。電圧が印
加されると電気光学素子２の屈折率が変化する。この屈
折率変化は電圧印加方向とその垂直方向で実効的な屈折
率の差を生じ、入射円偏光は電圧印加方向に偏光する光
とこれに垂直に偏光する光との間に位相差を生じ、電気
光学素子２通過後の光の偏光状態は電気光学素子２に印
加される電圧の大きさによって変化することになる。こ
れを検光子４を通過する光量として検出し、電圧の大き
さを逆算するのが光電圧センサの動作原理である。な
お、１／４波長板３を電気光学素子２と検光子４の間に
配しても等価である。When no voltage is applied to the electro-optical element 2 through the lead wire 6, circularly polarized light passes through the electro-optical element 2 and passes through the analyzer 4 with a half light amount. When a voltage is applied, the refractive index of the electro-optical element 2 changes. This change in the refractive index causes a difference in effective refractive index between the direction in which the voltage is applied and the direction perpendicular thereto, and the incident circularly polarized light causes a phase difference between the light polarized in the voltage applied direction and the light polarized perpendicularly thereto. The polarization state of the light after passing through the electro-optical element 2 changes depending on the magnitude of the voltage applied to the electro-optical element 2. The principle of operation of the photovoltage sensor is to detect this as the amount of light passing through the analyzer 4 and back-calculate the magnitude of the voltage. It is equivalent to disposing the quarter-wave plate 3 between the electro-optical element 2 and the analyzer 4.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら上記のよ
うな構成では、光電圧センサ組立時に各構成部品の精度
ばらつきにより電気光学素子２であるＬｉＮｂ1-XＴａX
Ｏ3（０≦Ｘ≦１）への入射光の軸ズレ（傾き）を生
じ、その結果温度特性劣化、感度のばらつき等が発生す
るという問題点を有していた。However, in the above-mentioned structure, the LiNb 1-X Ta X, which is the electro-optical element 2, is generated due to the variation in accuracy of each component when the optical voltage sensor is assembled.
There has been a problem that an axial deviation (inclination) of incident light to O 3 (0 ≦ X ≦ 1) occurs, resulting in deterioration of temperature characteristics, variation in sensitivity, and the like.
【００１０】本発明は上記問題点を解決するもので、温
度特性に優れ、感度ばらつきの少ない高精度の光電圧セ
ンサを提供するものである。The present invention solves the above problems, and provides a high-precision optical voltage sensor having excellent temperature characteristics and less variation in sensitivity.
【００１１】[0011]
【課題を解決するための手段】この目的を達成するため
に本発明の光電圧センサは、電気光学素子の出射面に波
長選択透過膜を設け、前記波長選択透過膜の全反射条件
に合致した波長の光を用いて反射光が最大になるように
前記電気光学素子への入射光の光軸を調整し、前記電気
光学素子への入射光の軸ズレを抑制する構成を有してい
る。In order to achieve this object, the optical voltage sensor of the present invention is provided with a wavelength selective transmission film on the emission surface of the electro-optical element and meets the total reflection condition of the wavelength selective transmission film. The optical axis of the incident light to the electro-optical element is adjusted so that the reflected light is maximized by using the light of the wavelength, and the axial deviation of the incident light to the electro-optical element is suppressed.
【００１２】[0012]
【作用】この構成によって、電気光学素子への入射光の
軸ズレを抑制することが可能になり、温度特性に優れ、
感度ばらつきの少ない高精度の光電圧センサを提供する
ことができる。With this configuration, it is possible to suppress the axial deviation of the incident light on the electro-optical element, which is excellent in temperature characteristics,
It is possible to provide a highly accurate photovoltage sensor with little sensitivity variation.
【００１３】[0013]
【実施例】以下に、本発明の実施例について図面を参照
しながら説明する。図１は本発明の一実施例における光
電圧センサの一部断面図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view of an optical voltage sensor according to an embodiment of the present invention.
【００１４】図１において、１は偏光子、２は電気光学
素子、３は１／４波長板、４は検光子、５は波長選択透
過膜、６は電気光学素子２に電圧を印加するためのリー
ド線、７はレンズ、８はフェルール、９は光ファイバ、
１０はレンズホルダーである。In FIG. 1, 1 is a polarizer, 2 is an electro-optical element, 3 is a quarter wavelength plate, 4 is an analyzer, 5 is a wavelength selective transmission film, and 6 is for applying a voltage to the electro-optical element 2. Lead wire, 7 is a lens, 8 is a ferrule, 9 is an optical fiber,
Reference numeral 10 is a lens holder.
【００１５】電気光学素子２は、ＬｉＮｂＯ3単結晶で
光の入射、出射面はそれぞれＺ面で光の進行方向はＺ軸
である。前記入出射面はそれぞれＺ軸に対して±３分以
内の精度で直角に鏡面研磨されている。この前記電気光
学素子２の出射面即ち１／４波長板３に相対する面に
は、誘電体多層膜からなる波長選択透過膜５が蒸着され
ている。The electro-optical element 2 is made of a LiNbO 3 single crystal and has a Z-plane as a light incident surface and a Z-plane as an emission surface, and the Z-axis is the traveling direction of the light. The entrance and exit surfaces are mirror-polished at right angles to the Z axis with an accuracy of within ± 3 minutes. A wavelength selective transmission film 5 made of a dielectric multilayer film is deposited on the emission surface of the electro-optical element 2, that is, the surface facing the quarter-wave plate 3.
【００１６】本実施例で使用する波長選択透過膜５は、
入射波長６００ｎｍ近傍でほぼ１００％反射し、８５０
ｎｍ近傍でほぼ１００％透過する特性になっている。本
実施例では、波長８５０ｎｍ、半値幅５０ｎｍのＬＥＤ
をセンサとしての光源に用い、６３２．８ｎｍのＨｅ−
Ｎｅレーザを光軸調整用の参照光として用いる。即ち、
前記センサ用光源である８５０ｎｍのＬＥＤ波長には、
波長選択透過膜５は透明な媒体として作用し、光電圧セ
ンサの動作には何等寄与しない。The wavelength selective transmission film 5 used in this embodiment is
Approximately 100% reflection at an incident wavelength of around 600 nm, 850
It has a characteristic of transmitting almost 100% in the vicinity of nm. In this embodiment, an LED having a wavelength of 850 nm and a half width of 50 nm is used.
Is used as a light source as a sensor, and a He- of 632.8 nm is used.
A Ne laser is used as a reference light for adjusting the optical axis. That is,
In the LED wavelength of 850 nm which is the light source for the sensor,
The wavelength selective transmission film 5 acts as a transparent medium and does not contribute to the operation of the photovoltage sensor.
【００１７】一方、前記６３２．８ｎｍのＨｅ−Ｎｅレ
ーザの波長に対しては全反射ミラーとして作用し、光電
圧センサとしては機能せず、光軸調整用の参照光源とし
てのみの機能を有する。On the other hand, it functions as a total reflection mirror for the wavelength of the He-Ne laser of 632.8 nm, does not function as a photovoltage sensor, and has a function only as a reference light source for adjusting the optical axis.
【００１８】図２に本実施例の光軸調整方法の概略図を
示す。レンズ７、フェルール８を同軸に保持するレンズ
ホルダー１０を回転ステージに取り付け、参照光源１３
からの光をカプラー１１によって分岐し、光ファイバ
９、フェルール８、レンズ７を通して偏光子１で電気光
学素子２に入射させ、波長選択透過膜５で反射させ、偏
光子１、レンズ７、フェルール８、光ファイバ９を通し
てカプラー１１で分岐して光パワーメータ１２に導かれ
た参照光の波長選択透過膜５での反射光をモニターしな
がら反射光量が最大になるように回転ステージを１４，
１５方向に調整する。前記反射光量が最大になったとき
電気光学素子２への入射光軸が入射面に対して垂直に調
整されたことになる。FIG. 2 shows a schematic view of the optical axis adjusting method of this embodiment. A lens holder 10 for holding the lens 7 and the ferrule 8 coaxially is attached to a rotary stage, and a reference light source 13
The light from is branched by the coupler 11, is made incident on the electro-optical element 2 by the polarizer 1 through the optical fiber 9, the ferrule 8 and the lens 7, and is reflected by the wavelength selective transmission film 5, and the polarizer 1, the lens 7 and the ferrule 8 are made. , While monitoring the reflected light at the wavelength selective transmission film 5 of the reference light which is branched by the coupler 11 through the optical fiber 9 and guided to the optical power meter 12, the rotary stage 14 is arranged so as to maximize the reflected light amount,
Adjust in 15 directions. When the amount of reflected light becomes maximum, the incident optical axis to the electro-optical element 2 is adjusted to be perpendicular to the incident surface.
【００１９】この条件のもとに作製した光電圧センサの
検出原理は、従来の技術の項に示したものと何等変わる
ものではない。感度の温度特性を図３に示す。−２０〜
８０℃の範囲内において±１％以内の良好な特性が得ら
れている。また、前記条件のもと作製した光電圧センサ
の感度の個片ばらつきは、±３％以内であった。The detection principle of the optical voltage sensor manufactured under these conditions is no different from that described in the section of the prior art. The temperature characteristic of sensitivity is shown in FIG. -20 to
Good characteristics within ± 1% are obtained within the range of 80 ° C. Further, the individual variation in the sensitivity of the optical voltage sensor manufactured under the above conditions was within ± 3%.
【００２０】以上のように電気光学素子２の出射面に設
けられた波長選択透過膜５の反射特性を利用して入射光
軸を調整することにより、温度特性の優れた感度ばらつ
きの少ない高精度の光電圧センサを実現できる。As described above, the incident optical axis is adjusted by utilizing the reflection characteristic of the wavelength selective transmission film 5 provided on the emission surface of the electro-optical element 2 so that the temperature characteristic is excellent and the sensitivity is high and the precision is small. Can be realized.
【００２１】[0021]
【発明の効果】以上のように本発明は電気光学素子の出
射面に波長選択透過膜を設けることにより、電気光学素
子への入射光の軸ズレを抑制することが可能になり、温
度特性に優れ、感度ばらつきの少ない高精度の光電圧セ
ンサを提供するものである。As described above, according to the present invention, by providing the wavelength selective transmission film on the emission surface of the electro-optical element, it is possible to suppress the axial deviation of the incident light to the electro-optical element and to improve the temperature characteristics. It is intended to provide a highly accurate photovoltage sensor with excellent sensitivity and little variation in sensitivity.
【図１】本発明の第１の実施例における光電圧センサの
構成図FIG. 1 is a configuration diagram of an optical voltage sensor according to a first embodiment of the present invention.
【図２】本発明の第１の実施例における光電圧センサの
光軸調整法を示す説明図FIG. 2 is an explanatory diagram showing an optical axis adjusting method of the optical voltage sensor according to the first embodiment of the present invention.
【図３】本発明の第１の実施例における光電圧センサの
感度の温度特性を示す特性図FIG. 3 is a characteristic diagram showing temperature characteristics of sensitivity of the optical voltage sensor according to the first embodiment of the present invention.
【図４】従来の光電圧センサの構成図FIG. 4 is a configuration diagram of a conventional optical voltage sensor.
【図５】従来の光電圧センサの動作原理を説明する図FIG. 5 is a diagram for explaining the operation principle of a conventional optical voltage sensor.
１ 偏光子 ２ 電気光学素子 ３ １／４波長板 ４ 検光子 ５ 波長選択透過膜 ６ 電圧印加用リード線 ７ レンズ ８ フェルール ９ 光ファイバ １０ レンズホルダー １１ カプラー １２ 光パワーメータ １３ 参照光源 １４，１５ 光軸調整方向 DESCRIPTION OF SYMBOLS 1 Polarizer 2 Electro-optical element 3 1/4 wavelength plate 4 Analyzer 5 Wavelength selective transmission film 6 Voltage application lead wire 7 Lens 8 Ferrule 9 Optical fiber 10 Lens holder 11 Coupler 12 Optical power meter 13 Reference light source 14, 15 light Axis adjustment direction
Claims (2)
学素子、波長板、検光子の順に配され、前記電気光学素
子の出射面即ち波長板と相対する面に波長選択透過膜を
設けた光電圧センサ。1. A polarizer, an electro-optical element, a wave plate, and an analyzer are arranged in this order with respect to the incident direction of light, and a wavelength-selective transmission film is provided on the emission surface of the electro-optical element, that is, the surface facing the wave plate. Optical voltage sensor provided.
3（０≦Ｘ≦１）を用いることを特徴とする請求項１記
載の光電圧センサ。2. LiNb 1-X Ta X O as an electro-optical element
3. The optical voltage sensor according to claim 1, wherein 3 (0 ≦ X ≦ 1) is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6279124A JPH08136588A (en) | 1994-11-14 | 1994-11-14 | Optical voltage sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6279124A JPH08136588A (en) | 1994-11-14 | 1994-11-14 | Optical voltage sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08136588A true JPH08136588A (en) | 1996-05-31 |
Family
ID=17606769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6279124A Pending JPH08136588A (en) | 1994-11-14 | 1994-11-14 | Optical voltage sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08136588A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8791831B2 (en) | 2011-09-23 | 2014-07-29 | Eaton Corporation | System including an indicator responsive to an electret for a power bus |
| US9093867B2 (en) | 2011-09-23 | 2015-07-28 | Eaton Corporation | Power system including an electret for a power bus |
-
1994
- 1994-11-14 JP JP6279124A patent/JPH08136588A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8791831B2 (en) | 2011-09-23 | 2014-07-29 | Eaton Corporation | System including an indicator responsive to an electret for a power bus |
| US8994544B2 (en) | 2011-09-23 | 2015-03-31 | Eaton Corporation | System including an indicator responsive to an electret for a power bus |
| US9093867B2 (en) | 2011-09-23 | 2015-07-28 | Eaton Corporation | Power system including an electret for a power bus |
| US9385622B2 (en) | 2011-09-23 | 2016-07-05 | Eaton Corporation | Power system including an electret for a power bus |
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