JPS58109858A - Voltage measuring device - Google Patents

Abstract

PURPOSE:To ensure accurate measurement of voltage without any effect of a current, etc., by providing a shield made of a magnetic material in each conductor and connecting an intermediate electrode of each phase which is set in correspondence to the conductor to a voltage sensor set within the shield. CONSTITUTION:A shield 5 made of a magnetic pipe is stored coaxially in the axial core of a conductor 3, and a voltage sensor 6 made of an electrooptic element is set within the shield 5. The sensor 6 is connected to an intermediate electrode 4 of each phase which is set in correspondence to the conductor 3 via electric connecting lines 8 and 9. When the sensor 6 is put into the axial core of the conductor 3, the magnetic field is completely eliminated and gives no effect at all. In the case of a 3-phase collective type, a magnetic field is generated by a current which flows through the conductor 3. However, the effect of this magnetic field can be completely eliminated since a bus conductor itself has a shilding effect and furthermore, the sensor 6 is put into the shield 5. In such a way, the voltage can be measured with high accuracy without receiving the effect of the voltage, current of another phase, etc.

Description

【発明の詳細な説明】 この発明は、変電所等の電気機器の導体電圧を測定する
電圧測定装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a voltage measuring device for measuring conductor voltage of electrical equipment such as a substation.

従来のものけ、計器用変圧器（ＦＴ）、コンデンサされ
ている。その一方式として、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法が研究されている
。これは、中間電極を設け、容量分圧によ？Ｘ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、電気光学素子が高電圧導体を流れ
る電流による磁界の影響を受け、また、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
という欠点があった。Conventional Mononoke is a potential transformer (FT) and a capacitor. As one method, a method of measuring voltage optically using an element having an electro-optic effect is being researched. Is this possible by providing an intermediate electrode and using capacitance partial pressure? This method divides the voltage of the X voltage conductor and applies the divided voltage to the electro-optical element, but the electro-optical element is affected by the magnetic field due to the current flowing through the high-voltage conductor, When the conductors are close to each other, there is a drawback that the voltage of the target high voltage conductor cannot be accurately detected due to induction from other phases.

この発明は、上記欠点を解消するためになされたもので
、電流による磁界の影響及び他相からの静電誘導を受け
ずに、対象とする高電圧導体の電圧を正確に測定できる
小形、低価格の電圧測定装置を提供する。This invention was made in order to eliminate the above-mentioned drawbacks, and is a compact, low-profile device that can accurately measure the voltage of a target high-voltage conductor without being affected by magnetic fields caused by current or electrostatic induction from other phases. Providing voltage measuring equipment at low prices.

以下、図についてｒＪｇｔ男する。第１図及び＠２図に
おいて、（１）＃−ｉ大地電位の対向電極である管状金
属容器、（２）は絶縁スペーサ、（３）は絶縁スペーサ
（２）を金鵬容！（１）と平行に貫通して一体に注形さ
れた母線導体である。母線導体（３）　Ｆｉ第１図にお
いては１相分のみ記載したが、第３図に示すように３相
の各相が金属容器（１）の細心と金ｇ容器（１）との闇
にｆｌｔ属容器（１）の周方向に間隔をあけて配置され
ている。また、母線導体（３）は片端から中央まで中空
になっており、金属容器（１）の軸心と反対側の側面、
すなわち、金属容器（１）に対する対向距離が最短にな
る側面に凹部（３ａ）が設けられている。（４）は中間
電極で、導体（３）の凹部（３ａ）に導体（３）から絶
縁されて配置されている。（５）は磁性体のパイプで構
成されたシールドで、導体（３）の軸心に同軸で収納さ
れている。（６）は電気光学素子から成る電圧センサで
、シールド（５）内に配置されている。（７）けルド継
手で、中間電極（４）の位置に人口にまるみを有する穴
（７ａ）が設けられている。（８）、（９）はそれぞれ
母線導体（３）、中間電極（４）の電位を電圧センサ（
６）に印加するための電気接続線、（１ｏ）は電力を伝
達するための母線導体、（１１）＃：を電圧センサ（６
）の先人出力線である光７アイパで、外気とけ気密が保
たれるように絶縁スペーサ（２）に注形されている。（
１２）／／ｉ電圧センサ（６）を駆動させるだめの光源
、受光素子、増幅回路等から代る信号処理回路、（１３
）は母線導体（３）の電圧に比例した出力を表示するた
めの表示器である。The following is a rJgt man about the figure. In Figures 1 and 2, (1) the tubular metal container that is the counter electrode for #-i earth potential, (2) the insulating spacer, and (3) the insulating spacer (2). This is a bus conductor that penetrates parallel to (1) and is integrally cast. Bus conductor (3) Fi In Fig. 1, only one phase is shown, but as shown in Fig. 3, each of the three phases is divided into the details of the metal container (1) and the gold container (1). They are arranged at intervals in the circumferential direction of the flt container (1). In addition, the bus conductor (3) is hollow from one end to the center, and the side opposite to the axis of the metal container (1),
That is, the recess (3a) is provided on the side surface where the distance facing the metal container (1) is the shortest. (4) is an intermediate electrode, which is placed in the recess (3a) of the conductor (3) so as to be insulated from the conductor (3). (5) is a shield made of a magnetic pipe, and is housed coaxially with the axis of the conductor (3). (6) is a voltage sensor consisting of an electro-optical element, and is arranged within the shield (5). (7) A keeled joint is provided with a rounded hole (7a) at the position of the intermediate electrode (4). (8) and (9) are the voltage sensors (
(1o) is the bus conductor for transmitting power, (11) #: is the electrical connection wire for applying voltage to the voltage sensor (6).
)'s predecessor output line, the Hikari 7 Eyepa, is cast into an insulating spacer (2) to keep it airtight from the outside air. (
12) //i A signal processing circuit that replaces the light source, light receiving element, amplifier circuit, etc. that drives the voltage sensor (6), (13
) is an indicator for displaying an output proportional to the voltage of the bus conductor (3).

次に動作について説明する。中間電極（４）と金属容器
（１）間の浮遊静電容量と、中間電極（４）と母線導体
（３）間の浮遊静電容量との容量分圧された電圧が電圧
センサ（６）に印加される。そして、電圧センサ環 （６）で光強度変調された光を信号処理回路（１２）に
よって電気信号に変換して所要の処理をし、母線電圧を
表示器（１３）に表示するものである。ここに、電圧セ
ンサ（６）　Ｆｉ偏光子、電気光学素子、１／４波長板
、検光子等で構成されるものであるが、一般的に知られ
たものなので、ここではその動作説明は省略する。電気
光学素子はファラデー効果をも有するため（磁界による
影響を受けるが、母線導体（３）の中空部に電圧センナ
（６）を入れることで、自相の電流による磁界からしや
へいされる。電ＥＥセンサ（６）を母線導体（３）の軸
心に入れると磁界はゼロとｆ！す、影響を受けない。ま
た、３相−話形の場合、他相の母線導体を流れる電流に
よって磁界が生じるが、母線導体（一般的にはアルミ、
鋼等の良導体が使われる）自体がシールド効果を有し、
さらに磁性体のシールド（５）の中に電圧センナ（６）
を入れることで、はぼ完全に磁界の影響を無くすことが
できる。また、３相−話形の場合、他相導体と中間電極
（４）闇の浮遊静電容量による他相の電圧による影響は
、第２図に示すように各相の中間電極（４）を金属容器
（１）に対して、その対向距離が最短になるように配置
することで、金属容！Ｉ　（１）自体がシールド効果を
持つため、はぼ完全に無くすこと力Ｉできる。この場合
、シールド継手（７）の穴（７＆）の人口にまるみを設
けているので、大きくシールド継手を高める役目をはえ
ず。次に、光ファイ−（１１）による外部への取出しに
ついては、絶縁スペーサ（２）を利用して、一体性形す
ることにより、光７アイパ専用の光貫通コネクタ等が不
要となり、気密を保ちつつ、外部に引出すことができ、
装置として小形となる。Next, the operation will be explained. A voltage sensor (6) detects the capacitance-divided voltage between the stray capacitance between the intermediate electrode (4) and the metal container (1) and the stray capacitance between the intermediate electrode (4) and the bus conductor (3). is applied to Then, the light intensity modulated by the voltage sensor ring (6) is converted into an electrical signal by a signal processing circuit (12), subjected to necessary processing, and the bus voltage is displayed on a display (13). Here, the voltage sensor (6) is composed of an Fi polarizer, an electro-optical element, a quarter-wave plate, an analyzer, etc., but since it is generally known, the explanation of its operation will be omitted here. do. Since the electro-optical element also has a Faraday effect (it is affected by the magnetic field), by inserting the voltage sensor (6) into the hollow part of the bus conductor (3), it is shielded from the magnetic field caused by the current in its own phase. When the electric EE sensor (6) is placed in the axis of the bus conductor (3), the magnetic field is zero and is not affected.In addition, in the case of a three-phase type, the magnetic field is not affected by the current flowing through the bus conductor of the other phase. A magnetic field is generated, but the bus conductor (generally aluminum,
(a good conductor such as steel is used) itself has a shielding effect,
Furthermore, there is a voltage sensor (6) inside the magnetic shield (5).
By adding , it is possible to almost completely eliminate the influence of the magnetic field. In addition, in the case of a three-phase type, the influence of the voltage of the other phase due to the stray capacitance between the other phase conductor and the intermediate electrode (4) is as shown in Figure 2. By arranging the metal container (1) so that the facing distance is the shortest, the metal container! Since I (1) itself has a shielding effect, it can be almost completely eliminated. In this case, since the holes (7&) of the shield joint (7) are rounded, they do not serve to greatly enhance the shield joint. Next, for taking out the optical fiber (11) to the outside, by using an insulating spacer (2) and making it an integral type, there is no need for an optical penetration connector etc. exclusively for Hikari 7 Aiper, and airtightness can be maintained. while also being able to be pulled out to the outside.
The device is small.

なお、上記実施例では、母線電流の流れる途上に配置し
比例であるが、母線端部に配置することもできる。この
場合は、第１図において、母４Ｉ尋休（ｌＯ）を外し、
金属容器（υの終端を密閉するようにすれば良い。In the above embodiment, it is arranged proportionally in the middle where the bus current flows, but it can also be arranged at the end of the bus bar. In this case, in Figure 1, remove the mother 4I interrogation (lO),
It is best to seal the end of the metal container (υ).

以上のようにこの発明によれば、他相の電圧の影響を受
けない、また、電流が流れてもその影響を受けず、小形
、高精度とすることができる。As described above, according to the present invention, the device is not affected by voltages of other phases, is not affected by current flow, and can be made compact and highly accurate.

【図面の簡単な説明】[Brief explanation of drawings]

第１図はこの発明の一実施例を示す断面図、第２図は、
第１図の［−１線における断面図である。 図中、（１）は金属容器、（３）　＃−を導体、（４）
は中間電極、（５）はシールド、（６）は電圧センサ、
（８）　（９）はＩＩ電気接続線ある。 なお、各図中同一符号は同−又は相当部分を示す。 第１図 第２図FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line [-1] of FIG. 1; In the figure, (1) is a metal container, (3) #- is a conductor, (4)
is the intermediate electrode, (5) is the shield, (6) is the voltage sensor,
(8) (9) is II electrical connection line. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 1 Figure 2

Claims (3)

【特許請求の範囲】[Claims] （１）昧電される中空状の３相用の各導体内に中空状の
磁性体からなるシールドを配置し、大地電位の対向電極
と所定の間隔をあけて対向し各相の上記導体に対応して
配置された各相の中間電極と、上記シールド内に配置し
た電圧センサとを接続したことを特徴とする電圧測定装
置。(1) A shield made of a hollow magnetic material is placed inside each hollow three-phase conductor to be electrically charged, and the shield is placed facing the counter electrode at ground potential at a predetermined distance from the conductor of each phase. A voltage measuring device characterized in that intermediate electrodes of each phase arranged in correspondence are connected to a voltage sensor arranged within the shield. （２）対向電極は各相の導体を一括して収納した円管状
の金属容器であることを特徴とする特許１ｉｌｌｙ！ｃ
の範囲＠１項記載の電圧測定装置。(2) Patent 1illy! characterized in that the counter electrode is a cylindrical metal container that collectively houses the conductors of each phase. c.
The voltage measuring device according to the range @ item 1. （３）各相の導体は金属容器の軸方向に延在し、上記金
ｗ４容器の軸心と上記金属容器との闇に上記金＠谷器−
の周方向に間隔をあけて配置され、上記金＠谷器の軸心
と反対側の側面に上記金属容器と対向した中間電極が配
置されていることを特徴とする時、ｆｆ−請求の範囲第
２項記載の電圧測定装置。(3) The conductors of each phase extend in the axial direction of the metal container, and are located between the axis of the gold w4 container and the metal container.
When characterized in that an intermediate electrode is disposed at intervals in the circumferential direction of the metal container and faces the metal container on the side surface opposite to the axis of the metal container, ff-Claims The voltage measuring device according to item 2.