JPH021267B2 - - Google Patents
Info
- Publication number
- JPH021267B2 JPH021267B2 JP56199673A JP19967381A JPH021267B2 JP H021267 B2 JPH021267 B2 JP H021267B2 JP 56199673 A JP56199673 A JP 56199673A JP 19967381 A JP19967381 A JP 19967381A JP H021267 B2 JPH021267 B2 JP H021267B2
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- voltage
- sensor
- measuring device
- electrode
- 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
- 239000004020 conductor Substances 0.000 claims description 34
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 239000000696 magnetic material Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 230000005684 electric field Effects 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 description 10
- 125000006850 spacer group Chemical group 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/241—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using electro-optical modulators, e.g. electro-absorption
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Description
【発明の詳細な説明】
この発明は、変電所等の高電圧電気機器の導体
電圧を測定する装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring conductor voltage of high voltage electrical equipment such as a substation.
従来のものは、計器用変圧器（PT）、コンデン
サ形計器用変圧器（PD）が主として使われてい
るが、大形、高価格等の欠点があり、新しい方式
が要望されている。その１方式として、電気光学
効果を有した素子を使い、光学的に電圧を測定す
る方式が研究されている。これは、中間電極を設
け、容量分圧により、高電圧導体の電圧を分圧
し、その分圧電圧を前記電気光学素子に印加する
方式であるが、多相の高電圧導体が接近している
場合、他相からの誘導により、正確に対象とする
高電圧導体の電圧を検出することができない。ま
た、単相の場合であつても、電気光学効果を有す
る素子には、磁気光学効果をも有するため、母線
電流による磁界の影響を受けるという欠点があつ
た。 Conventionally, potential transformers (PT) and capacitor-type potential transformers (PD) are mainly used, but they have drawbacks such as large size and high cost, so new systems are needed. As one method, a method of measuring voltage optically using an element having an electro-optic effect is being researched. This is a method in which an intermediate electrode is provided, the voltage of a high voltage conductor is divided by capacitance partial voltage, and the divided voltage is applied to the electro-optical element, but multiphase high voltage conductors are close to each other. In this case, the voltage of the target high voltage conductor cannot be accurately detected due to induction from other phases. Further, even in the case of a single phase, an element having an electro-optic effect also has a magneto-optic effect, so it has the disadvantage that it is affected by the magnetic field due to the bus current.
この発明は上記欠点を解消するためになされた
もので、センサを導体に接続された磁性体のシー
ルドの凹部に配置することによつて、母線電流の
影響も受けず、正確に対象とする高電圧導体の電
圧を測定する小形、低価格の装置を提供する。 This invention was made to eliminate the above-mentioned drawbacks, and by placing the sensor in the recess of the magnetic shield connected to the conductor, it is not affected by the bus current and can accurately target high voltages. A small, low-cost device for measuring the voltage of a voltage conductor is provided.
この発明の一実施例を図に示す。すなわち、図
は管状ガス絶縁電気機器に適用した場合のこの発
明の電圧センサを用いた構成図で、１，２は大地
電位と対向した対向電極である管状の金属容器、
３は絶縁スペーサ、４は被測定導体に接続された
導体、５は絶縁スペーサ３に埋込まれた導体、６
は導体５の一端に取付けられた金属容器２と対向
した凹形くぼみ、すなわち凹部６ａを有する磁性
体から成るシールド電極、７は中間電極、８は偏
光子、リチウムナイオベート等の電気光学素子、
１／４波長板、検光子で構成された電圧センサ、９
は電圧センサ８に光を送受するための光フアイ
バ、１０は光フアイバ９と接続部１１で接続され
た引出し用光フアイバで、気密を保つよう構成さ
れている。１２は保護被覆付の光フアイバ、１３
は電圧センサ８に光を送り、被測定導体の電圧に
比例して強度変調された光を必要な電気量に変換
するための処理回路、１４は電圧を表示するため
の表示器である。 An embodiment of this invention is shown in the figure. That is, the figure is a configuration diagram using the voltage sensor of the present invention when applied to a tubular gas-insulated electric device, and 1 and 2 are a tubular metal container that is a counter electrode facing the ground potential;
3 is an insulating spacer, 4 is a conductor connected to the conductor to be measured, 5 is a conductor embedded in the insulating spacer 3, 6
is a shield electrode made of a magnetic material having a concave depression 6a facing the metal container 2 attached to one end of the conductor 5, 7 is an intermediate electrode, 8 is a polarizer, an electro-optical element such as lithium niobate,
Voltage sensor consisting of a quarter wavelength plate and analyzer, 9
10 is an optical fiber for transmitting and receiving light to and from the voltage sensor 8, and 10 is an optical fiber for extraction connected to the optical fiber 9 at a connecting portion 11, which is configured to maintain airtightness. 12 is an optical fiber with a protective coating, 13
14 is a processing circuit for sending light to the voltage sensor 8 and converting the intensity-modulated light into a necessary amount of electricity in proportion to the voltage of the conductor to be measured, and 14 is a display for displaying the voltage.
次に動作を説明する。ガス絶縁電気機器は、基
準電位、たとえば、大地電位に保たれた管状の密
閉金属容器１，２内に、その基準電位に対して高
電位の電圧が印加されている導体４，５と絶縁性
能を高めるための絶縁ガス、例えば、SF6ガス
（図示せず）から構成される。前記導体５の一端
に電界強度を緩和した形状で、凹形の凹部６ａを
有するシールド電極６が接続され、その中の電圧
センサ８には、中間電極７と導体９との間の電圧
が印加されるが、その電圧は、中間電極７と大地
電位である金属容器２間の浮遊静電容量と、中間
電極７とシールド電極６及び導体５間の浮遊静電
容量並びに電圧センサの自己静電容量との合成容
量との分圧により決定される。従つて、その分圧
電圧を検出することにより母線導体の電圧を測定
することができる。電気光学素子を用いた電圧測
定装置はすでによく知られているものであるの
で、ここでは説明を省略する。なお、光フアイバ
を用いるため、高電位部からの絶縁は確保され
る。ところで、多相の母線導体が金属容器１，２
内に収納されている場合（図では１相分しか図示
していない。）、他相からの静電誘導分は、凹形の
シールドのため、凹部６ａ内へは入つてこない。
また、母線導体に大電流が流れる場合（図の導体
４の延長側）、この電流による磁界は、シールド
電極６が磁性体から成るため、磁気シールドさ
れ、電圧センサ８には影響を及ぼさない。さら
に、密閉金属容器外に光信号を送受する際に、母
線導体を支持するために必要である絶縁スペーサ
に光フアイバを埋込む。この場合、母線導体近傍
では高温となるため、母線導体近傍の光フアイバ
９はテフロンジヤケツト等でできたものを使用
し、金属容器近傍で一般用光フアイバ１０と接続
する。これは、テフロンでは絶縁スペーサ３間で
気密が十分保たれないため、金属容器近傍１１を
ナイロンジヤケツト等にして気密を保つためであ
る。しかも引出し部で光フアイバが折れないよう
にするため引出し部近傍で保護被覆付の光フアイ
バ１２で外部に引出す。 Next, the operation will be explained. Gas insulated electrical equipment has conductors 4 and 5 to which a high potential voltage is applied with respect to the reference potential, and insulation performance in tubular sealed metal containers 1 and 2 maintained at a reference potential, for example, earth potential. It is composed of an insulating gas, such as SF 6 gas (not shown), to increase the temperature. A shield electrode 6 having a concave recess 6a is connected to one end of the conductor 5 to reduce the electric field strength, and a voltage between the intermediate electrode 7 and the conductor 9 is applied to a voltage sensor 8 therein. However, the voltage depends on the stray capacitance between the intermediate electrode 7 and the metal container 2 which is at ground potential, the stray capacitance between the intermediate electrode 7 and the shield electrode 6 and the conductor 5, and the self-electrostatic capacity of the voltage sensor. It is determined by the partial pressure between the capacitance and the combined capacitance. Therefore, the voltage of the bus conductor can be measured by detecting the divided voltage. Since voltage measuring devices using electro-optical elements are already well known, their explanation will be omitted here. Note that since optical fibers are used, insulation from high potential parts is ensured. By the way, the multiphase bus conductor is in metal containers 1 and 2.
When it is housed in the concave portion 6a (only one phase is shown in the figure), electrostatic induction from other phases does not enter the concave portion 6a because of the concave shield.
Further, when a large current flows through the bus conductor (on the extension side of the conductor 4 in the figure), the magnetic field due to this current is magnetically shielded and does not affect the voltage sensor 8 because the shield electrode 6 is made of a magnetic material. Furthermore, an optical fiber is embedded in an insulating spacer that is necessary to support the bus conductor when transmitting and receiving optical signals outside the sealed metal container. In this case, since the temperature near the bus conductor is high, the optical fiber 9 near the bus conductor is made of a Teflon jacket or the like, and is connected to the general purpose optical fiber 10 near the metal container. This is because Teflon does not sufficiently maintain airtightness between the insulating spacers 3, so the vicinity 11 of the metal container is made of a nylon jacket or the like to maintain airtightness. Moreover, in order to prevent the optical fiber from breaking at the pull-out portion, the optical fiber 12 is drawn out with a protective coating near the pull-out portion.
なお、上記実施例はセンサとして電圧センサを
用いた場合について説明したが、中間電極を設け
ずまたセンサを導体から電気的に切り離し、セン
サを電界センサとして用いる場合にも適用でき
る。 Although the above embodiments have been described with reference to a case where a voltage sensor is used as a sensor, the present invention can also be applied to a case where an intermediate electrode is not provided, the sensor is electrically separated from a conductor, and the sensor is used as an electric field sensor.
また、シールド電極を導体の端部に設けたもの
について説明したが、導体の中間部に設けてもセ
ンサを導体の磁界からシールドすることができ
る。 Further, although the shield electrode is provided at the end of the conductor, the sensor can be shielded from the magnetic field of the conductor even if the shield electrode is provided in the middle of the conductor.
また、上記はガス絶縁電気機器に適用した例で
あるが、この発明はこれに限らず、気中絶縁形、
油絶縁形の電気機器にも適用できる。 Further, although the above is an example of application to gas insulated electric equipment, the present invention is not limited to this, and the invention is not limited to this.
It can also be applied to oil-insulated electrical equipment.
以上のようにこの発明によれば、凹形状の磁性
体からなるシールド電極を導体と接続してセンサ
を磁性体の凹部に配置して、センサが導体を流れ
る電流の影響を受けないようにしたので、高精度
である。 As described above, according to the present invention, a shield electrode made of a concave magnetic material is connected to a conductor, and a sensor is placed in a concave portion of the magnetic material, so that the sensor is not affected by the current flowing through the conductor. Therefore, it is highly accurate.
図はこの発明の一実施例の断面図である。図
中、１，２は金属容器、４，５は導体、６はシー
ルド電極、６ａは凹部、８はセンサである。
The figure is a sectional view of one embodiment of the present invention. In the figure, 1 and 2 are metal containers, 4 and 5 are conductors, 6 is a shield electrode, 6a is a recess, and 8 is a sensor.
Claims (1)
状の磁性体からなるシールド電極を課電される導
体に接続し、電界あるいは電圧に応じて光を変調
するセンサを上記シールド電極の凹部に配置した
ことを特徴とする電圧測定装置。 ２ センサは電気光学効果を有する素子、偏光
子、1/4波長板及び検光子等で構成されたことを
特徴とする特許請求の範囲第１項記載の電圧測定
装置。 ３ センサは金属容器と導体との間に配置された
中間電極と、上記導体との間に設けられ上記中間
電極及び上記導体と電気的に接続されたことを特
徴とする特許請求の範囲第１項又は第２項記載の
電圧測定装置。 ４ 対向電極は導体を収納した金属容器であるこ
とを特徴とする特許請求の範囲第１項ないし第３
項のいずれかに記載の電圧測定装置。[Scope of Claims] 1. A sensor that modulates light according to an electric field or voltage by connecting a shield electrode made of a concave magnetic material with an opening facing a counter electrode with an earth potential to an energized conductor. A voltage measuring device characterized in that it is arranged in a recessed part of a shield electrode. 2. The voltage measuring device according to claim 1, wherein the sensor is composed of an element having an electro-optic effect, a polarizer, a quarter-wave plate, an analyzer, etc. 3. Claim 1, characterized in that the sensor is provided between an intermediate electrode disposed between the metal container and the conductor, and the conductor, and is electrically connected to the intermediate electrode and the conductor. The voltage measuring device according to item 1 or 2. 4. Claims 1 to 3, characterized in that the counter electrode is a metal container containing a conductor.
The voltage measuring device according to any one of paragraphs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56199673A JPS5899762A (en) | 1981-12-09 | 1981-12-09 | Voltage measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56199673A JPS5899762A (en) | 1981-12-09 | 1981-12-09 | Voltage measuring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5899762A JPS5899762A (en) | 1983-06-14 |
| JPH021267B2 true JPH021267B2 (en) | 1990-01-10 |
Family
ID=16411711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56199673A Granted JPS5899762A (en) | 1981-12-09 | 1981-12-09 | Voltage measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5899762A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19634251A1 (en) * | 1996-08-26 | 1998-03-05 | Abb Patent Gmbh | Voltage converter |
-
1981
- 1981-12-09 JP JP56199673A patent/JPS5899762A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5899762A (en) | 1983-06-14 |
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