JP2867505B2 - Instrument transformer - Google Patents
Instrument transformerInfo
- Publication number
- JP2867505B2 JP2867505B2 JP1316019A JP31601989A JP2867505B2 JP 2867505 B2 JP2867505 B2 JP 2867505B2 JP 1316019 A JP1316019 A JP 1316019A JP 31601989 A JP31601989 A JP 31601989A JP 2867505 B2 JP2867505 B2 JP 2867505B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- container
- detection electrode
- conductor
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明はガス絶縁機器などに使用される光学的手段
を用いた計器用変圧器に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument transformer using optical means used for gas-insulated equipment and the like.
［従来の技術］ 電力設備の大容量化、高電圧化に伴ない、電力機器の
制御、監視などに用いられる計器用変圧器には信頼性の
高いものが要求されている。このため、高い耐サージ・
ノイズ性能を有し測定値の高精度化、小形・軽量化を達
成することが可能な光学的手段を用いた光計器用変圧器
（以下光PTと称する）が有効な技術として注目を集めて
いる。[Prior Art] With the increase in capacity and voltage of power equipment, highly reliable instrument transformers used for control and monitoring of power equipment are required. For this reason, high surge resistance
Transformers for optical instruments (hereinafter referred to as optical PT) using optical means that have noise performance and can achieve high precision, small size and light weight of measured values have attracted attention as an effective technology. I have.
この光PTを用いた電力計器としては、例えば高電圧導
体の保護・監視用システムがある。この保護・監視用シ
ステムは、高電圧導体の電圧を電気光学効果であるポッ
ケルス効果を利用した電圧センサで測定し、その光出力
信号をシステム内部の計器やリレー等に光ファイバを介
して伝達し、高電圧導体の保護・監視を行うものであ
る。このようなシステムに用いられる光PTの確度階級は
1.0級が一般的であるが、今後はシステムの信頼性の向
上の要求に答えて、さらに高精度の装置を使用する必要
がある。As a power meter using the optical PT, for example, there is a system for protecting and monitoring a high-voltage conductor. This protection / monitoring system measures the voltage of a high-voltage conductor with a voltage sensor that uses the Pockels effect, which is an electro-optic effect, and transmits the optical output signal to instruments and relays inside the system via an optical fiber. To protect and monitor high voltage conductors. The accuracy class of the optical PT used in such a system is
The 1.0 class is generally used, but in the future it will be necessary to use higher-precision equipment in response to demands for improved system reliability.
このような光PTの測定精度を低下させる要因として
は、機械的なものを含めて種々考えられるが、その中で
大きな比重を占めるものとして、ポッケルス効果を利用
した電圧センサの周囲温度に対する温度特性が考えられ
る。例えば、日中屋外においてこの電圧センサを一般的
な金属容器に収納して測定する場合、この金属容器は周
囲温度や直射日光による影響を直接受けて、金属容器内
部の温度は摂氏60℃を越える場合がある。この時の電圧
センサによる測定値には温度特性による誤差が発生し、
その誤差は経験によると測定値の最大約0.6％にもな
る。この誤差は光PTの確度階級1.0級における誤差の半
分以上を占めるものである。このように、従来の電圧セ
ンサは金属容器の周囲温度の影響を直接的に受けて光PT
の測定精度を低下させている。このために、電圧センサ
に与える金属容器の周囲温度の影響をいかに小さく抑え
るかが光PTを高精度化するための重要な点となってい
る。There are various factors that can reduce the measurement accuracy of the optical PT, including mechanical ones. Among them, the one that occupies a large specific gravity is the temperature characteristic of the voltage sensor using the Pockels effect with respect to the ambient temperature. Can be considered. For example, when measuring this voltage sensor in a general metal container outdoors during the day, the metal container is directly affected by the ambient temperature and direct sunlight, and the temperature inside the metal container exceeds 60 ° C. There are cases. At this time, an error due to temperature characteristics occurs in the measurement value of the voltage sensor,
According to experience, the error can be up to about 0.6% of the measured value. This error accounts for more than half of the error in the accuracy class 1.0 of the optical PT. Thus, the conventional voltage sensor is directly affected by the ambient temperature of the
Measurement accuracy is reduced. Therefore, how to minimize the influence of the ambient temperature of the metal container on the voltage sensor is an important point for improving the accuracy of the light PT.
［発明が解決しようとする課題］ このような光PTの精度を向上させるためには、金属容
器内の強制換気等を行ない、金属容器内部の温度変化を
小さくする必要があった。しかしこのために装置の構造
が複雑になるとともに、換気装置自体の信頼性も重要な
点となり、装置全体の信頼性の点、また装置が大形で高
価になるという点で問題があった。[Problems to be Solved by the Invention] In order to improve the accuracy of such a light PT, it is necessary to reduce the temperature change inside the metal container by performing forced ventilation or the like in the metal container. However, this complicates the structure of the device, and the reliability of the ventilator itself is also an important point, and there are problems in terms of the reliability of the entire device and the fact that the device is large and expensive.
この発明は上記のような問題点を解消するためになさ
れたもので、高い信頼性を有し、高精度で、かつ小形で
安価な計器用変圧器を得ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to obtain a highly reliable, highly accurate, compact, and inexpensive instrument transformer.
［課題を解決するための手段］ この発明に係る計器用変圧器は、絶縁ガスを封入し、
高電圧導体を収納した接地された接地容器と、 前記接地容器と前記高電圧導体との間に配設され、前
記接地容器と前記高電圧導体のそれぞれに対して所定空
間を有して実質的に平行に配設された分圧用電極、 前記分圧用電極に電気的に接続された平板状の検出用
電極と、 前記検出用電極に一方が電気的に接続され、他方が前
記接地容器に電気的に接続されたコンデンサと、 前記検出用電極に対して所定空間を有して対向して配
設され、前記検出用電極の電界の強さをポッケルス効果
を用いて測定し、その測定結果にもとづいて前記高電圧
導体の電圧に対応する光信号を出力する電圧センサと、 前記接地容器に固着され、前記検出用電極、前記コン
デンサ及び前記電圧センサを内部に配設し、絶縁ガスが
充填された気密の断熱室を形成する二重隔壁を有する計
器用変圧器収納容器と、 前記電圧センサからの光信号が光ファイバを介して入
力され、前記光信号から前記高電圧導体の電圧を検出す
る電圧検出部とを具備する。[Means for Solving the Problems] A measuring instrument transformer according to the present invention is filled with an insulating gas,
A grounded container housing a high-voltage conductor, disposed between the grounded container and the high-voltage conductor, substantially having a predetermined space for each of the grounded container and the high-voltage conductor; A voltage-dividing electrode disposed in parallel with the electrode, a plate-shaped detection electrode electrically connected to the voltage-dividing electrode, one of which is electrically connected to the detection electrode, and the other of which is electrically connected to the grounding container. A capacitor that is electrically connected and is disposed to face the detection electrode with a predetermined space, and measures the intensity of the electric field of the detection electrode using the Pockels effect. A voltage sensor that outputs an optical signal corresponding to the voltage of the high-voltage conductor, based on the detection electrode, the capacitor, and the voltage sensor, which are fixed to the grounding container, and are filled with an insulating gas. Form a closed airtight insulation room And instrument transformer container having heavy septum, optical signals from the voltage sensor is inputted through the optical fiber comprises a voltage detection unit for detecting a voltage of said high voltage conductor from the optical signal.
［作用］ この発明における計器用変圧器は、接地容器内部の高
電圧導体の電圧を測定するために、分圧用電極とコンデ
ンサにより分圧された二次側電圧を、二重隔壁を有する
計器用変圧器収納容器（以下PT収納容器と称する）内に
配設した光学的電圧測定手段を用いて測定するものであ
り、このPT収納容器内部の温度は二重隔壁の作用によ
り、周囲温度の変化及び直射日光による温度上昇の影響
が小さい。[Operation] The measuring instrument transformer according to the present invention uses the secondary voltage divided by the voltage dividing electrode and the capacitor to measure the voltage of the high-voltage conductor inside the grounded container, and measures the voltage of the measuring instrument having the double partition. The temperature inside the transformer container (hereinafter referred to as PT container) is measured using optical voltage measuring means. The temperature inside the PT container changes with the ambient temperature due to the action of the double partition wall. And the effect of temperature rise due to direct sunlight is small.
［実施例］ 以下、この発明の計器変圧器の一実施例を図を参照し
て説明する。第１図はこの発明の一実施例による計器用
変圧器を示す断面図である。図の紙面に垂直方向に導出
した筒状の接地容器１内部には絶縁ガス３が封入され、
この接地容器１の略中央には、接地容器１と平行に導出
した高電圧導体２が配設されている。この高電圧導体２
と前記金属容器１との間には円筒状の分圧用電極４が同
軸上に配設されている。この分圧用電極４は高電圧導体
２及び金属容器１に一定の絶縁空間を有して設けられて
いる。そして、分圧用電極４は接地容器１の側面に設け
たフランジ部1aに固着した取付金具12に絶縁支持物５を
介して固定されている。このフランジ部1aには前記取付
金具12を介して計器用変圧器収納容器（PT収納容器）９
が取付けられている。このPT収納容器９は、第１の隔壁
9aと第２の隔壁9bを具備しており、その間には断熱室9c
という空間が設けられている。このPT収納容器９の内部
には、前記接続容器１内部で分極用電極４と電気的に接
続された接続導体11が導入されている。この接続導体11
は検出用電極10を介して２個のコンデンサ6,6のそれぞ
れの一端に接続されている。各コンデンサ6,6の他端は
接地容器１に電気的にそれぞれ接続されている。また、
このPT収納容器９の内部には、前記検出用電極10の電圧
を測定するための光学的電圧測定手段である公知の電圧
センサ７が配設されている。この電圧センサ７は電気光
学効果であるポッケルス効果を利用したもので、検出用
電極10の電界の強さを測定し電圧に置換するものであ
る。電圧センサ７からの光出力信号は、光ファイバ８を
通ってこの装置の外部に設けた保護・監視システムの電
圧検出部に伝えられる。[Embodiment] Hereinafter, an embodiment of the instrument transformer of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an instrument transformer according to an embodiment of the present invention. An insulating gas 3 is sealed in a cylindrical grounding container 1 which is drawn out in a direction perpendicular to the plane of the drawing.
At a substantially center of the grounding container 1, a high-voltage conductor 2 extending in parallel with the grounding container 1 is provided. This high voltage conductor 2
A cylindrical voltage dividing electrode 4 is coaxially arranged between the metal container 1 and the metal container 1. The voltage dividing electrode 4 is provided in the high-voltage conductor 2 and the metal container 1 with a certain insulating space. The voltage dividing electrode 4 is fixed to a mounting member 12 fixed to a flange 1 a provided on the side surface of the grounding container 1 via an insulating support 5. An instrument transformer container (PT container) 9 is attached to the flange portion 1a via the mounting bracket 12.
Is installed. This PT storage container 9 is a first partition
9a and a second partition 9b, between which a heat insulating chamber 9c
Space is provided. Into the PT container 9, a connection conductor 11 electrically connected to the polarization electrode 4 inside the connection container 1 is introduced. This connection conductor 11
Is connected to one end of each of the two capacitors 6, 6 via the detection electrode 10. The other ends of the capacitors 6, 6 are electrically connected to the grounding container 1, respectively. Also,
A known voltage sensor 7 which is an optical voltage measuring means for measuring the voltage of the detection electrode 10 is provided inside the PT storage container 9. The voltage sensor 7 utilizes the Pockels effect, which is an electro-optical effect, and measures the intensity of the electric field of the detection electrode 10 and substitutes the voltage with a voltage. An optical output signal from the voltage sensor 7 is transmitted through an optical fiber 8 to a voltage detection unit of a protection / monitoring system provided outside the device.
上記のように分圧用電極４は、接地容器１内部におい
て高電圧導体２に絶縁空間を有して対向しており、PT収
納容器９内部においてコンデンサ6,6の一方の端子に接
続導体11及び検出用電極10を介して接続されている。し
たがって、分圧用電極４には、高電圧導体２の印加電圧
Ｖ、高電圧導体２と分圧用電極４間の絶縁空間の静電容
量C1、コンデンサ6,6の合成容量C2に応じた、下記に示
す二次側電圧υが発生する。As described above, the voltage-dividing electrode 4 faces the high-voltage conductor 2 with an insulating space inside the grounding container 1, and the connection conductor 11 and one terminal of the capacitors 6, 6 inside the PT container 9. It is connected via a detection electrode 10. Therefore, the voltage dividing electrode 4 depends on the applied voltage V of the high voltage conductor 2, the capacitance C 1 of the insulating space between the high voltage conductor 2 and the voltage dividing electrode 4, and the combined capacitance C 2 of the capacitors 6 and 6. , The following secondary voltage に is generated.
すなわち、それぞれの静電容量C1及びC2が一定であれ
ば分圧用電極４と電気的に接続されている検出用電極10
には、高電圧導体２の印加電圧Ｖに比例した二次側電圧
υが発生する。この二次側電圧υをポッケルス効果を利
用した電圧センサ７で精度高く測定し、その出力信号を
外部に設けた保護・制御システムの計器やリレー等に伝
送する。 In other words, if the respective capacitances C 1 and C 2 are constant, the detection electrode 10 electrically connected to the voltage dividing electrode 4.
Generates a secondary voltage υ proportional to the voltage V applied to the high-voltage conductor 2. This secondary voltage υ is measured with high accuracy by a voltage sensor 7 utilizing the Pockels effect, and the output signal is transmitted to an external instrument or relay of a protection / control system.
本発明の計器用変圧器における前述のPT収納容器９
は、PT収納容器９内部に配設した計器を直射日光などか
ら遮蔽する日照保護カバーの役割を果している。またPT
収納容器９は、断熱室9cをもった二重構造となっている
ため、接地容器１の内部空間には周囲温度の熱が伝わり
にくい構造となっている。したがって、PT収納容器９内
部の温度は、直射日光は周囲温度に直接影響されなくな
る。実験によると、直射日光下においてこのPT収納容器
９内部の温度は従来の一重構造の容器に比べて摂氏５〜
10℃程度低く抑えることができた。このように、PT収納
容器９内部には従来の装置のように複雑な機構の強制換
気装置を設けてなくても、PT収納容器９を簡単な構成の
二重構造にすることにより、PT収納容器９内部の温度変
化幅は小さくなり、かつ急激に変化しないものとなる。
したがって、このPT収納容器９内部に配設されている電
圧センサ７は、温度変化幅の小さいPT収納容器９内部で
測定できるため、精度の高い電圧測定が可能となる。The aforementioned PT storage container 9 in the instrument transformer of the present invention.
Plays a role of a sun protection cover that shields instruments disposed inside the PT storage container 9 from direct sunlight and the like. Also PT
Since the storage container 9 has a double structure including the heat insulating chamber 9c, the internal space of the grounded container 1 has a structure in which heat at ambient temperature is not easily transmitted. Therefore, the temperature inside the PT storage container 9 is not directly affected by the ambient temperature due to direct sunlight. According to the experiment, the temperature inside the PT storage container 9 under direct sunlight is 5 degrees Celsius compared to the conventional single-structured container.
The temperature could be kept low by about 10 ° C. As described above, even if a forced ventilation device having a complicated mechanism is not provided inside the PT storage container 9 as in the conventional device, the PT storage container 9 has a simple structure of a double structure, so that the PT storage container 9 has a simple structure. The temperature change width inside the container 9 becomes small and does not change rapidly.
Therefore, since the voltage sensor 7 disposed inside the PT storage container 9 can measure inside the PT storage container 9 having a small temperature change width, highly accurate voltage measurement can be performed.
以上は断熱室9c内部を密閉空気とした場合であるが、
この部分の空間は密閉空気に特定の他に、空気より熱伝
導率の悪いガスたとえばアルゴンガスを封入してもよ
く、また真空状態にして対流による熱伝導の媒体をなく
すことも効果がある。The above is the case where the inside of the heat insulating chamber 9c is sealed air,
The space in this portion is not limited to the sealed air, but may be filled with a gas having a lower thermal conductivity than air, such as argon gas, and it is also effective to eliminate the medium for heat conduction by convection by making a vacuum.
なお、上記実施例では分圧用電極４が高電圧導体２と
同軸の筒状のものを示したが、分圧用電極は平板状のも
のでも良く、この場合も上記実施例と同様の効果を奏す
ることは言うまでもない。In the above embodiment, the voltage dividing electrode 4 has a cylindrical shape coaxial with the high-voltage conductor 2. However, the voltage dividing electrode may have a flat plate shape. In this case, the same effect as in the above embodiment can be obtained. Needless to say.
［発明の効果］ 以上のように、この発明によればPT収納容器を簡単な
構成の断熱構造にすることにより、信頼性の高い、高精
度の装置となり、かつ小形で安価な計器用変圧器が得ら
れる効果がある。[Effects of the Invention] As described above, according to the present invention, a PT storage container has a simple structure of a heat insulating structure, thereby providing a highly reliable, high-precision device, and a small and inexpensive instrument transformer. The effect is obtained.
第１図はこの発明の一実施例による計器用変圧器を示す
断面図である。図において、１は接地容器、２は高電圧
導体、３は絶縁ガス、４は分圧用電極、６はコンデン
サ、７は電圧センサ、９は計器用変圧器収納容器であ
る。 なお、図中、同一符号は同一又は相当部分を示す。FIG. 1 is a sectional view showing an instrument transformer according to an embodiment of the present invention. In the figure, 1 is a ground container, 2 is a high-voltage conductor, 3 is an insulating gas, 4 is a voltage dividing electrode, 6 is a capacitor, 7 is a voltage sensor, and 9 is a transformer housing for an instrument. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (1)
接地された接地容器、 前記接地容器と前記高電圧導体との間に配設され、前記
接地容器と前記高電圧導体のそれぞれに対して所定空間
を有して実質的に平行に配設された分圧用電極、 前記分圧用電極に電気的に接続された平板状の検出用電
極、 前記検出用電極に一方が電気的に接続され、他方が前記
接地容器に電気的に接続されたコンデンサ、 前記検出用電極に対して所定空間を有して対向して配設
され、前記検出用電極の電界の強さをポッケルス効果を
用いて測定し、その測定結果にもとづいて前記高電圧導
体の電圧に対応する光信号を出力する電圧センサ、 前記接地容器に固着され、前記検出用電極、前記コンデ
ンサ及び前記電圧センサを内部に配設し、絶縁ガスが充
填された気密の断熱室を形成する二重隔壁を有する計器
用変圧器収納容器、 前記電圧センサからの光信号が光ファイバを介して入力
され、前記光信号から前記高電圧導体の電圧を検出する
電圧検出部、 を具備することを特徴とする計器用変圧器。1. A grounded ground container enclosing an insulating gas and containing a high-voltage conductor, disposed between the ground container and the high-voltage conductor, and provided in each of the ground container and the high-voltage conductor. A voltage-dividing electrode disposed substantially in parallel with a predetermined space, a plate-shaped detection electrode electrically connected to the voltage-dividing electrode, one of which is electrically connected to the detection electrode The other is electrically connected to the grounded container, the capacitor is disposed to face the detection electrode with a predetermined space, the intensity of the electric field of the detection electrode using the Pockels effect A voltage sensor that outputs an optical signal corresponding to the voltage of the high-voltage conductor based on the measurement result. The voltage sensor is fixed to the grounding container, and the detection electrode, the capacitor, and the voltage sensor are provided therein. And filled with insulating gas An instrument transformer storage container having a double partition wall forming a dense heat-insulating chamber, a voltage detection device that receives an optical signal from the voltage sensor via an optical fiber and detects a voltage of the high-voltage conductor from the optical signal. A transformer for an instrument, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1316019A JP2867505B2 (en) | 1989-12-04 | 1989-12-04 | Instrument transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1316019A JP2867505B2 (en) | 1989-12-04 | 1989-12-04 | Instrument transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03175606A JPH03175606A (en) | 1991-07-30 |
| JP2867505B2 true JP2867505B2 (en) | 1999-03-08 |
Family
ID=18072346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1316019A Expired - Fee Related JP2867505B2 (en) | 1989-12-04 | 1989-12-04 | Instrument transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2867505B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2111047C1 (en) * | 1996-11-22 | 1998-05-20 | Махмутов Фаниль Ахатович | Porous membrane with reduced vapor permeability |
| FR2764390B1 (en) * | 1997-06-06 | 1999-07-16 | Gec Alsthom T D Balteau | ELECTRO-OPTICAL SENSOR WITH SOLID VOLTAGE DIVIDER |
| JP4896280B1 (en) * | 2011-05-20 | 2012-03-14 | 三菱電機株式会社 | Instrument transformer |
-
1989
- 1989-12-04 JP JP1316019A patent/JP2867505B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03175606A (en) | 1991-07-30 |
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