JPS60146161A - Abnormality detector for electric insulation equipment - Google Patents

Abstract

PURPOSE:To facilitate the detection of the magnitude of abnormal discharge by comparing a potential vibration of a metal container by a pulse current with a potential vibration thereof by an abnormal discharge of an electric insulation equipment. CONSTITUTION:The capacitance 9 in an equivalence circuit is as such formed with a metal container 3, a dielectric 7 and a trapping electrode 6 while the capacitance 14 as such formed with the container 3, the dielectric 7 and an application electrode 12. Therefore, when currents to be fed to ground impedances 10 respectively from a reference power source 13 and an abnormal discharge power source 11 are represented by ic and id and the value of the ground impedance Z, the potential difference of the ground impedance 10 by the currents is expressed by the potential difference of the impedance Z by the current ic Vc=icXZ and the potential difference of the impedance Z by the current id Vd=idXZ and hence, id=icXVd/Vc is established by both the expressions. The magnitude of the current fed from the abnormal discharge power source 11, namely, the abnormal discharge can be detected from both the potential differences and the value of current applied from the reference power source 13 even when the ground impedance is unknown.

Description

【発明の詳細な説明】 〔発明の技術分野〕 この発明は、電気所において用いられる電力用機器、た
とえば高電圧回路を形成する金属導体、この金属導体を
囲繞する電気絶縁物、並びにこれらの金属導体および電
気絶縁物を包蔵する接地された金属容器で構成される管
路母線すなわち電気絶縁機器の異常放電の大きさを検出
する異常検出装置に関するものである。[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to power equipment used in electric stations, such as metal conductors forming high voltage circuits, electrical insulators surrounding these metal conductors, and The present invention relates to an abnormality detection device that detects the magnitude of abnormal discharge in a conduit busbar, that is, an electrically insulating device, which is composed of a grounded metal container containing a conductor and an electrically insulating material.

〔従来技術〕[Prior art]

従来、電気所に設置された電気絶縁機器の内部異常放電
を検出する装置の一例を第７図に示す。FIG. 7 shows an example of a conventional device for detecting internal abnormal discharge in electrically insulating equipment installed at an electrical station.

ｌは高電圧回路を形成する金属導体すなわち高電圧導体
、コは金属導体／を囲繞する電気絶縁物、３はこれらを
包蔵する金属容器、ダは接地線で金属容器３を大地５に
接地する。６は金属容器の電位振動を捕捉する捕捉電極
で、誘電体りを介して金属容器３の外周に所定面積をも
って取り付ゆられ、また検出器ｇを介して大地Ｓに接地
される。1 is a metal conductor that forms a high voltage circuit, that is, a high voltage conductor, ko is an electrical insulator surrounding the metal conductor, 3 is a metal container that encloses these, and DA is a grounding wire that grounds the metal container 3 to the earth 5. . Reference numeral 6 denotes a capture electrode for capturing potential vibrations of the metal container, which is attached to the outer periphery of the metal container 3 with a predetermined area via a dielectric material, and is grounded to the earth S via a detector g.

従来の異常検出装置は上記のように構成され、その検出
原理を第２図の等何回路で説明する。図において、りは
金属容器３と誘電体７と捕捉電極６で形成される静電容
量、ｌθは金属容器の接地インピーダンス、ｌ／は金属
導体ｌの一部で放電したパルス電流の大地帰路分と等価
な定電流パルス電源を示す異常放電電源。異常放電電源
／／の電流は金属容器３の接地インピーダンス／θを流
れ、接地インピーダンス端子間すなわち金属容器３と大
地Ｓの間に電位振動が生じる。この電位振動を静電容量
りを介して検出器ｇで検出することにより異常放電を検
出する。The conventional abnormality detection device is constructed as described above, and its detection principle will be explained using the circuit shown in FIG. In the figure, ri is the capacitance formed by the metal container 3, dielectric 7, and capture electrode 6, lθ is the grounding impedance of the metal container, and l/ is the earth return path of the pulse current discharged in a part of the metal conductor l. An abnormal discharge power supply showing a constant current pulse power supply equivalent to The current from the abnormal discharge power source // flows through the ground impedance /θ of the metal container 3, and potential oscillations occur between the ground impedance terminals, that is, between the metal container 3 and the earth S. Abnormal discharge is detected by detecting this potential oscillation with a detector g via a capacitance.

しかるに、上記のように金属容器３の接地インピーダン
スｌＯの大きさによって検出出力が異なるため、異常放
電の大きさが同一であっても電気絶縁機器の構成方式に
よって検出出力が異１．ｃす、異常放電の大きさを定量
的に検出することが田作な欠点があった。However, as described above, the detection output varies depending on the magnitude of the grounding impedance IO of the metal container 3, so even if the magnitude of the abnormal discharge is the same, the detection output will vary depending on the configuration of the electrically insulated equipment.1. However, there was a drawback in that it was difficult to quantitatively detect the magnitude of abnormal discharge.

〔発明の概要〕[Summary of the invention]

この発明は、このような欠点を改善するＩＡ的でなされ
たもので、金属容器３に既知の大きさのパルス電流を加
え、このパルス電流による金属容器３の電位振動と、電
気絶縁機器の異常放電による金属容器３の電位振動とを
比較測定することによって前記異常放電の大きさを容易
に検出できる異常検出装置を提案するものである。This invention was made in an IA manner to improve such drawbacks, and involves applying a pulse current of a known magnitude to the metal container 3, and detecting potential oscillations in the metal container 3 due to this pulse current and abnormalities in electrically insulating equipment. The present invention proposes an abnormality detection device that can easily detect the magnitude of the abnormal discharge by comparing and measuring the potential vibration of the metal container 3 due to the discharge.

〔発明の実施例〕[Embodiments of the invention]

この発明の一実施例を第３図に示す。７〜ｇは従来装置
と全く同一のものである。／λは既知の大きさのパルス
電流を加えるための印加電極であって、捕捉電極４が取
り付けられたのと同一の誘電体り上に捕捉電極６から間
隔をおいて捕捉電極乙と同時に取り付けられ、これによ
り電極を複数回取り付ける煩雑さを無くしている。１３
は既知の大きさのパルス電流を発生する基準電源であり
、印加電極１２と検出器ｇの大地側端子との間に挿入さ
れている。An embodiment of this invention is shown in FIG. 7 to g are completely the same as the conventional device. /λ is an application electrode for applying a pulse current of a known magnitude, and is attached at the same time as the capture electrode B at a distance from the capture electrode 6 on the same dielectric body on which the capture electrode 4 is attached. This eliminates the trouble of attaching electrodes multiple times. 13
is a reference power supply that generates a pulse current of a known magnitude, and is inserted between the application electrode 12 and the ground terminal of the detector g.

第グ図は、上記実施例の等価回路であり、第３図とあわ
せて実施例の動作原理を説明する。／４’は金属容器３
と誘電体７と印加電極／、２で形成される静電容量を示
す。りから１３は前出の第１図。FIG. 3 is an equivalent circuit of the above embodiment, and the principle of operation of the embodiment will be explained in conjunction with FIG. /4' is metal container 3
shows the capacitance formed by the dielectric 7 and the application electrode/2. 13 is the figure 1 mentioned above.

第２図および第３図と同一部分を示す。基準電源／３か
ら接地インピーダンス１０に供給される電流をＬｃ、異
常放電電源／／から接地インピーダンス１０に供給され
る電流をｉｄ　、接地インピーダンス１０の値をＺとす
ると、それぞれの電、流による接地インピーダンスＩＯ
の電位差は次式による。The same parts as FIGS. 2 and 3 are shown. If the current supplied from the reference power supply /3 to the grounding impedance 10 is Lc, the current supplied from the abnormal discharge power supply // to the grounding impedance 10 is id, and the value of the grounding impedance 10 is Z, then the grounding due to the respective currents and currents Impedance IO
The potential difference is given by the following formula.

ＬｃによるＺの電位差　ＶＣ＝　Ｌｃ　Ｘ　ＺＬｄによ
るＺの電位差　Ｖｄ　＝　Ａｄ　Ｘ　Ｚ両式からＬｄ　
＝＝　Ｌｃ　Ｘ　Ｖｄ　／　ＶｃとＩＩす、異常放電電
源／／から供給される市流すなわち異常放電の大きさは
接地インピーダンスの値が未知であっても、上記の両者
の電位差と基準電源／３から加える電流値によって検出
できる。基準電ｄｆ、　／　、マから金属容器３に加え
るパルス電流の立上りは、接地インピーダンスｌθが数
マ１′クロヘンリー以下の低インダクタンスで構成され
るため、１０ナノ秒以下の速いものでないと十分な検出
感度が得られない。Potential difference in Z due to Lc VC = Lc X Potential difference in Z due to Ld Vd = Ad
== Lc It can be detected by the current value applied from The rise of the pulse current applied from the reference voltage df, / , to the metal container 3 must be as fast as 10 nanoseconds or less because the ground impedance lθ is a low inductance of several microhenries or less. Detection sensitivity cannot be obtained.

〔発明の効果〕〔Effect of the invention〕

この発明は以上説明したとおり、従来の異常検出装置に
既知のパルス電流を加えるという簡学な手法によって異
常放電の大きさを容易に検出できる効果がある。また、
既知のパルス電流を加える印加電極と従来の電位振動を
捕捉する捕捉電極とを同時に製作することによって電極
を取り付ける作業の煩雑さをなくす効果がある。As explained above, the present invention has the advantage that the magnitude of abnormal discharge can be easily detected by a simple method of applying a known pulse current to a conventional abnormality detection device. Also,
By simultaneously manufacturing an application electrode that applies a known pulsed current and a conventional trapping electrode that traps potential oscillations, there is an effect of eliminating the complexity of the work of attaching the electrodes.

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

第１図は電気絶縁機器の従来の異常検出装置を示す断面
図、第２図は第１図に示した異常検出装置の検出原理を
示す等価回路図、第３図はこの発明の一実施例を示す断
面図、第ダ図は第３図の実施例の検出原理を示す等価回
路図である。 図において、／は金属導体、コは電気絶縁物、３は金属
容器、グは接地線、Ｓは大地、６は捕捉爪４か、？は誘
電体、εは検出器、９は捕捉電極の等価詐市容ｉ、／θ
は金属容器の接地インピータ。 ンス、／ｌは異常放電電源、／２は印加電極、１３は基
準′電源、／ｌＩは印加電極の等価静電容量である。 なお各図中同一符号をよ同一または相当部分を示幣１図 ６ 殆２図 幣４図Fig. 1 is a sectional view showing a conventional abnormality detection device for electrically insulated equipment, Fig. 2 is an equivalent circuit diagram showing the detection principle of the abnormality detection device shown in Fig. 1, and Fig. 3 is an embodiment of the present invention. FIG. 3 is an equivalent circuit diagram showing the detection principle of the embodiment of FIG. 3. In the figure, / is a metal conductor, C is an electrical insulator, 3 is a metal container, G is a grounding wire, S is ground, 6 is a catching claw 4, etc. is the dielectric, ε is the detector, and 9 is the equivalent market value of the capture electrode i, /θ
is a grounded impetitor in a metal enclosure. /l is the abnormal discharge power supply, /2 is the application electrode, 13 is the reference power supply, and /lI is the equivalent capacitance of the application electrode. The same symbols in each figure indicate the same or equivalent parts.1 figure 6, most 2 figures, 4 figures.

Claims (2)

【特許請求の範囲】[Claims] （１）　高電圧回路を形成する金属導体、この金属電気
絶縁機器中の、上記金属容器へ誘電体を介して取り付け
られた捕捉電極と大地の間に検出器を接続した異常検出
装置において、上記捕捉１「極から間隔をおい１上記誘
電体へ取り付けられた印加電極と大地の間に既知の大き
さの、＜ルス電流を発生する基準電源を接続したことを
特徴とする電気絶縁機器の異常検出装置。(1) A metal conductor forming a high voltage circuit, an abnormality detection device in which a detector is connected between the ground and a capture electrode attached to the metal container via a dielectric in this metal electrically insulated equipment. Trap 1: An abnormality in an electrically insulating device characterized by connecting a reference power source that generates a <Russ current of known magnitude between the application electrode attached to the dielectric material 1 above the pole at a distance from the pole, and the ground. Detection device. （２）パルス電流の立上りがｌＯナノ秒以下であること
を特徴とする特許請求の範囲第１項記載の異常検出装置
。(2) The abnormality detection device according to claim 1, wherein the rise of the pulse current is 10 nanoseconds or less.