JPS5850468A - Measuring device for voltage - Google Patents

Abstract

PURPOSE:To measure accurately the voltage of a high-voltage conductor without being affected by electrostatic induction from other phases, by providing a recess at the end of a bus conductor, and by providing a field sensor in the recess. CONSTITUTION:A gas-insulated electric apparatus is constituted by a bus conductor 2 whereon a voltage of high potential is impressed and by an insulating gas, which are held in a hermetically-sealed metal vessel 1 kept at a reference potential. The end 2-1 of the bus conductor 2 is formed into a sphere so as to relax the field intensity and provided with a concave cut, and a field sensor 3 constituted by an electrooptical element, a 1/4 wavelength plate and an analyzer is placed in the cut. The voltage of the bus conductor 2 can be measured by detecting a field between the vessel 1 and the conductor 2 by means of the sensor 3. A processing circuit 7 emits a light to the field sensor 3 and transduces the light whose intensity is modulated proportional to the voltage of the bus conductor 2 into a quantity of electricity, while an indicator 8 indicates the voltage thus obtained.

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流を測
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 current of high voltage electrical equipment such as a substation.

先づ従来のものの説明とその欠点を説明する。First, the conventional method and its drawbacks will be explained.

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法が研究されている。これ
は、中間電極を設は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、正確に対称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。In the past, potential transformers (PT) and capacitor type potential transformers (PD) have been mainly used, but these have drawbacks such as large size and high cost, and new systems are desired. As one method, a method of optically measuring voltage using an element having an electro-optic effect is being researched. This is a method in which the voltage of a high voltage conductor is divided by capacitive partial voltage by setting an intermediate electrode, and the divided voltage is applied to the electro-optical element. However, when multi-phase high voltage conductors are close to each other, However, due to induction from other phases, it is not possible to accurately detect the voltage of a symmetrical high voltage conductor.

この発明は、上記欠点を克服したもので、他相からの静
電誘導を受けずに、正確に対称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ことを目的と
する。The present invention overcomes the above-mentioned drawbacks, and aims to provide a small, low-cost device that measures the voltage of a precisely symmetrical high-voltage conductor without receiving electrostatic induction from other phases. do.

本発明の一実施例を第１図〜第２図に示す。すなわち、
第１図はガス絶縁電気機器に適用した場合の本発明の電
界センサを用いた構成図で、（１）は密閉金属容器、（
２）は高電圧母線導体、（２−１）は母線導体（２）の
端部で電界強度を緩和するため球状にしている。（２−
２）は端部（２−１）に設けた凹形の切り込み、（３）
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、検光子で構成される電界センサ、（４）は
電界センサ（３）に光を送受するための光ファイバ、（
５）は気密を保ち、密閉金属容器（１）から光を伝達す
るための光コネクタ、（６）は離れた位置まで伝送する
光ファイバ、（７）は電界センサ（３）に光を送り、母
線導体（２）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、（８）は電圧を表
示するための表示器である。An embodiment of the present invention is shown in FIGS. 1 and 2. That is,
Figure 1 is a configuration diagram using the electric field sensor of the present invention when applied to gas-insulated electrical equipment, where (1) shows a closed metal container, (
2) is a high voltage bus conductor, and (2-1) is the end of the bus conductor (2), which is made into a spherical shape to reduce the electric field strength. (2-
2) is a concave notch provided at the end (2-1), (3)
is a polarizer, an electro-optical element such as lithium niobate, 1
An electric field sensor consisting of a /4 wavelength plate and an analyzer, (4) is an optical fiber for transmitting and receiving light to the electric field sensor (3), (
5) is an optical connector that maintains airtightness and transmits light from the sealed metal container (1); (6) is an optical fiber that transmits light to a remote location; (7) is an optical connector that transmits light to an electric field sensor (3); A processing circuit (8) is a processing circuit for converting intensity-modulated light in proportion to the voltage of the bus conductor (2) into a necessary amount of electricity, and a display device (8) is for displaying the voltage.

第２図は、ガス絶縁電気機器に適用した場合の本発明の
電圧センサを用いた構成図で、（９）は母線導体（２）
と絶縁した電極、００はコンデンサ、αηは電界センサ
と同一構成の電圧センサで、第１図と同一の記号は、同
一の物を示す。Figure 2 is a configuration diagram using the voltage sensor of the present invention when applied to gas-insulated electrical equipment, where (9) shows the bus conductor (2).
00 is a capacitor, αη is a voltage sensor having the same structure as the electric field sensor, and the same symbols as in FIG. 1 indicate the same things.

以上本発明の作用を第１図を使って説明する。The operation of the present invention will be described above with reference to FIG.

ガス絶縁電気機器は、基準電位、たとえば大地電位に保
たれた密閉金属容器（１）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母線導体（２）と絶縁性
能を高めるための絶縁ガス、例えばＳＦｅガス（図示せ
ず）から構成される。その母線導体（２）の端部（２−
１）を電界強度を緩和するために球状にし、凹形の切り
込みを設けて、その中に電界センサ（３）を入れると、
（１）と（２）間の電界がセンサ（３）にかかる。従っ
て母線導体の電圧と（１）と（２）間の電界は比例関係
にあるため、電界を検出することにより母線導体（２）
の電圧が測定できる。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るものでここでは説明を省略する
。なお、光ファイバ（４）を用いるため、高電圧導体（
２）と金属容器（１）間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）内に収納される場合（
第１図では１相分しか図示していない。）、他相の電界
による影響は、凹形の切り込み（２−２）のために静電
シールドされてほとんど電界センサ（３）に現われない
。従って他相からの影響を受けず、小形で、安価な電圧
測定装置となる。第２図は電圧センサを用いた場合の構
成を示しているが、センサとしては、電界センサも、電
圧センサも同一構成であり、単に電気光学素子に電極を
設け、導線により電圧を印加するものが電圧センサであ
る。第２図において、導体（２）の電圧は、コンデンサ
αＯ及び電極（９）と導体（２）間の浮遊静電容量との
合成容量と、電極（９）と金属容器（１）との浮遊静電
容量により分圧されて、電圧センサα◇にその分圧が印
加される。この場合、コンデンサαＯが無くても電極（
９）の位置により分圧比を変えられるため、特にコンデ
ンサは必要としない。この場合も、前述したのと同様、
他相からの影春は凹形切り込み（２−２）により、静電
シールドされ、無視できる。Gas-insulated electrical equipment has a bus conductor (2) to which a high potential voltage is applied relative to the reference potential within a sealed metal container (1) kept at a reference potential, for example, earth potential, to improve insulation performance. An insulating gas such as SFe gas (not shown) is used for this purpose. The end of the bus conductor (2) (2-
1) is made into a sphere to reduce the electric field strength, a concave cut is made, and the electric field sensor (3) is inserted into it.
An electric field between (1) and (2) is applied to the sensor (3). Therefore, since there is a proportional relationship between the voltage of the bus conductor and the electric field between (1) and (2), by detecting the electric field, the bus conductor (2)
voltage can be measured. A voltage measuring device using an electro-optical element is already well known, and its explanation will be omitted here. Note that since the optical fiber (4) is used, the high voltage conductor (
2) and the metal container (1) is ensured. By the way, when the multiphase bus conductor is housed in the metal container (1) (
In FIG. 1, only one phase is shown. ), the influence of electric fields of other phases hardly appears on the electric field sensor (3) because of electrostatic shielding due to the concave notch (2-2). Therefore, it is not affected by other phases, and becomes a small and inexpensive voltage measuring device. Figure 2 shows the configuration when a voltage sensor is used, but both the electric field sensor and the voltage sensor have the same configuration; they simply provide an electrode on an electro-optical element and apply a voltage using a conductor. is the voltage sensor. In Figure 2, the voltage of the conductor (2) is the combined capacitance of the capacitor αO and the stray capacitance between the electrode (9) and the conductor (2), and the stray capacitance between the electrode (9) and the metal container (1). The voltage is divided by the capacitance, and the partial pressure is applied to the voltage sensor α◇. In this case, even if there is no capacitor αO, the electrode (
Since the voltage division ratio can be changed depending on the position of 9), no particular capacitor is required. In this case as well, as mentioned above,
The shadow spring from other phases is electrostatically shielded by the concave notch (2-2) and can be ignored.

以上実施例はガス絶縁電気機器に適用した例であるが、
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。The above embodiments are examples applied to gas-insulated electrical equipment, but
The invention is not limited to this, but can also be applied to air-insulated or oil-insulated electrical equipment.

以上のように本発明は、多相の母線導体を含むガス絶縁
電気機器において、他相からの影響を受けずに、小形、
安価に対称とする母線導体の電圧を測定することができ
る。As described above, the present invention enables gas insulated electrical equipment including multi-phase bus conductors to be compact, free from influence from other phases,
The voltage of a symmetrical bus conductor can be measured at low cost.

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

第１図は、本発明の電界センサを用いた場合の構成図で
、第２図は、電圧センサを用いた場合の構成図である。 図において、（１）は密閉金属容器、（２）は母線導体
、（３）は電界センサ、（４）、（６）は光ファイバ、
（５）は光コネクタ、（７）は処理回路である。 代理人　葛野信−FIG. 1 is a block diagram when the electric field sensor of the present invention is used, and FIG. 2 is a block diagram when a voltage sensor is used. In the figure, (1) is a sealed metal container, (2) is a bus conductor, (3) is an electric field sensor, (4) and (6) are optical fibers,
(5) is an optical connector, and (7) is a processing circuit. Agent Makoto Kuzuno

Claims (3)

【特許請求の範囲】[Claims] （１）多相の母線導体を含む電気機器において、各々母
線導体端部に凹形の切り込みを設け、それぞれ前記凹部
内に電界センサを設けたことを特徴とする電圧測定装置
。(1) A voltage measuring device for an electrical device including multiphase bus conductors, characterized in that a concave cut is provided at the end of each bus conductor, and an electric field sensor is provided in each of the concave portions. （２）凹部内に、電圧センサ、母線導体から絶縁された
電極をそれぞれ順に配置し、前記電極と母線導体間に、
前記電圧センサを電気的に接続し、かつ、分圧用のコン
デンサを前記電圧センサと並列に接続したことを特徴と
する特許請求の範囲第１項記載の電圧測定装置。(2) A voltage sensor and an electrode insulated from the bus conductor are arranged in order in the recess, and between the electrode and the bus conductor,
2. The voltage measuring device according to claim 1, wherein the voltage sensor is electrically connected, and a voltage dividing capacitor is connected in parallel with the voltage sensor. （３）電界センサ、電圧センサとして、電気光学効果を
有する素子、及び電界又は電圧による光強度変調をする
ために偏光子、１／４波長板、検光子等から構成され、
離れた場所で被測定電圧に比例した電圧出力を出すため
に、光ファイバで、電界センサ、または、電圧センサと
処理回路を接続したことを特徴とする特許請求の範囲第
１項または第２項に記載の電圧測定装置。(3) As an electric field sensor or a voltage sensor, it is composed of an element having an electro-optic effect, a polarizer, a quarter-wave plate, an analyzer, etc. to modulate the light intensity by an electric field or voltage,
Claims 1 or 2, characterized in that the electric field sensor or the voltage sensor and the processing circuit are connected by an optical fiber in order to output a voltage proportional to the voltage to be measured at a remote location. Voltage measuring device described in.