JP2008014852A - Charged state erroneous detection prevention device of electroscope - Google Patents

Charged state erroneous detection prevention device of electroscope Download PDF

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JP2008014852A
JP2008014852A JP2006187413A JP2006187413A JP2008014852A JP 2008014852 A JP2008014852 A JP 2008014852A JP 2006187413 A JP2006187413 A JP 2006187413A JP 2006187413 A JP2006187413 A JP 2006187413A JP 2008014852 A JP2008014852 A JP 2008014852A
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voltage
charged state
capacitor
bus
erroneous detection
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JP4940794B2 (en
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Naoya Morohashi
直哉 諸橋
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent erroneous detection of the charged state of a conductor by an electroscope. <P>SOLUTION: A branched bus 3 is supported by a capacitor insertion type support insulator 6 having a grounded capacitor 7, in voltage detection by the electroscope 5 for the branched bus 3 in the non-charged state provided near a main bus 2 in the charged state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、高圧受配電盤等における検電器の充電状態誤検出防止装置に関するものである。   The present invention relates to an apparatus for preventing erroneous detection of a charge state of a voltage detector in a high voltage distribution board or the like.

例えば、高圧受配電盤は、昨今、低コスト、小スペース化が求められ、縮小化されている。図４（ａ），（ｂ）はそれぞれ従来の高圧受配電盤の内部透視斜視図及び内部の要部正面図を示し、１は真空遮断器であり、Ｒ，Ｓ，Ｔの各相の主母線２と分岐母線３とは真空遮断器１により接続され、あるいは切り離される。なお、分岐母線３には変流器４が設けられている。主母線２と分岐母線３とが切り離されると、主母線２は電圧を印加されて充電状態にあるが、分岐母線３は無電圧（非充電状態）となる。通常、導体の充電状態の判別は、検電器５により行われる。検電器５は、特許文献１に示されるように、その握り部を作業者が把持した状態で先端部を導体に接触させると、導体が充電状態にある場合、検電器５、検電器５のアース電極と作業者間に形成される浮遊静電容量、作業者、作業者と対地間に形成される浮遊静電容量等を介して静電誘導電流が充電部と対地間に流れ、これによって検電器５は音や光を発生する。従って、作業者は導体が充電状態であることを検出することができ、感電事故を未然に防止することができる。
特許第３５３０８１７号公報 For example, high-voltage power distribution boards have recently been reduced in size because of low cost and small space. 4 (a) and 4 (b) are respectively a perspective view of the interior of a conventional high-voltage distribution board and a front view of the main part of the interior. 2 and the branch bus 3 are connected or disconnected by the vacuum circuit breaker 1. The branch bus 3 is provided with a current transformer 4. When the main bus 2 and the branch bus 3 are disconnected, the main bus 2 is applied with a voltage and is in a charged state, but the branch bus 3 is in no voltage (non-charged state). Usually, the state of charge of the conductor is determined by the voltage detector 5. As shown in Patent Document 1, when the tip is brought into contact with the conductor while the gripper is gripped by an operator as shown in Patent Document 1, when the conductor is in a charged state, the voltage detector 5 and the voltage detector 5 An electrostatic induction current flows between the charging unit and the ground via the floating capacitance formed between the ground electrode and the worker, the floating capacitance formed between the worker and the worker, and the ground. The voltage detector 5 generates sound and light. Therefore, the operator can detect that the conductor is in a charged state, and can prevent an electric shock accident.
Japanese Patent No. 3530817

しかしながら、真空遮断器１によって、分岐母線３を主母線２から切り離しても、検電器５により分岐母線３に接触すると、電圧を誤検出することがある。これは、高圧受配電盤の縮小化により主母線２と分岐母線３との距離が近くなり、分岐母線３の近くに高圧充電部である主母線２が存在することにより、分岐母線３は高圧充電部からの静電誘導を受けて誘導電圧を発生するからである。   However, even if the branch bus 3 is disconnected from the main bus 2 by the vacuum circuit breaker 1, if the voltage detector 5 contacts the branch bus 3, the voltage may be erroneously detected. This is because the distance between the main bus 2 and the branch bus 3 is reduced due to the reduction of the high-voltage distribution board, and the main bus 2 which is a high-voltage charging unit exists near the branch bus 3, so that the branch bus 3 is charged with high voltage. This is because an induced voltage is generated in response to electrostatic induction from the unit.

この発明は上記のような課題を解決するために成されたものであり、検電器による導体の充電状態の誤検出を防止することができる検電器の充電状態誤検出防止装置を得ることを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a charge state erroneous detection prevention device for a voltage detector capable of preventing erroneous detection of the charge state of a conductor by the voltage detector. And

この発明の請求項１に係る検電器の充電状態誤検出防止装置は、充電状態の導体の近傍に設けられた非充電状態の導体を検電する検電器において、非充電状態の導体を接地されたコンデンサを有するコンデンサ挿入型の支持碍子により支持したものである。   According to a first aspect of the present invention, there is provided an apparatus for preventing erroneous detection of a charged state of a voltage detector, wherein the non-charged conductor is grounded in a voltage detector for detecting a non-charged conductor provided near the charged conductor. It is supported by a capacitor insertion type support insulator having a capacitor.

以上のようにこの発明の請求項１によれば、非充電状態の導体を接地されたコンデンサを有するコンデンサ挿入型の支持碍子により支持しており、非充電状態の導体に検電器を接触させると、充電状態の導体の対地電圧に対して、充電状態の導体と検電器間の浮遊静電容量、検電器、非充電状態の導体及びコンデンサを介して大地へと通じる回路が形成され、誘導電圧はコンデンサにより低減される。   As described above, according to the first aspect of the present invention, when the non-charged conductor is supported by the capacitor insertion type supporting insulator having the grounded capacitor, and the voltage detector is brought into contact with the non-charged conductor. In response to the ground voltage of the charged conductor, a circuit is formed that leads to the ground through the stray capacitance between the charged conductor and the detector, the detector, the non-charged conductor and the capacitor, and the induced voltage. Is reduced by a capacitor.

以下、この発明を実施するための最良の形態を図面とともに説明する。図１（ａ），（ｂ）はこの発明の実施最良形態による検電器の充電状態誤検出防止装置の正面図及びその要部拡大図、図２はこの実施最良形態によるコンデンサ挿入型支持碍子の斜視図を示し、真空遮断器１の遮断状態においては、充電状態の主母線２の近傍には非充電状態の分岐母線３が設けられている。各相の分岐母線３のうち例えばＳ相の分岐母線３は、図２に示すコンデンサ挿入型の支持碍子６により支持される。支持碍子６は例えば静電容量Ｃが２５０ｐＦのコンデンサ７が埋設され、コンデンサ７の一端には分岐母線３が取り付けられた主回路部８が設けられ、他端にはアース部１１が設けられる。   The best mode for carrying out the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) are a front view and an enlarged view of a main part of a charge state erroneous detection preventing device for a voltage detector according to the best mode of the present invention, and FIG. A perspective view is shown, and when the vacuum circuit breaker 1 is cut off, a branch bus 3 in a non-charged state is provided in the vicinity of the main bus 2 in a charged state. Of the branch buses 3 of each phase, for example, the S phase branch bus 3 is supported by a capacitor insertion type support insulator 6 shown in FIG. For example, a capacitor 7 having a capacitance C of 250 pF is embedded in the support insulator 6, a main circuit portion 8 to which the branch bus 3 is attached is provided at one end of the capacitor 7, and a ground portion 11 is provided at the other end.

上記構成において、検電時に作業者１０により検電器５を分岐母線３に接触させると、充電状態の主母線２の対地電圧に対して、図３に示すように、主母線２と検電器５間の浮遊静電容量９、検電器５、分岐母線３及びコンデンサ７を介して大地へと通じる回路が形成される。このため、高圧充電部である主母線２からの静電誘導により分岐母線３は誘導電圧を発生するが、コンデンサ７によりこの誘導電圧は低減され、検電器５による充電状態の誤検出は防止される。   In the above configuration, when the voltage detector 5 is brought into contact with the branch bus 3 by the operator 10 during voltage detection, the main bus 2 and the voltage detector 5 as shown in FIG. 3 with respect to the ground voltage of the main bus 2 in the charged state. A circuit that leads to the ground is formed through the floating electrostatic capacitance 9, the voltage detector 5, the branch bus 3, and the capacitor 7. For this reason, the branch bus 3 generates an induced voltage by electrostatic induction from the main bus 2 which is a high-voltage charging unit, but this induced voltage is reduced by the capacitor 7 and erroneous detection of the charged state by the voltage detector 5 is prevented. The

次に、実際に試験用の高圧受配電盤を製作し、Ｓ相の分岐母線３を通常の支持碍子と２５０ｐＦのコンデンサ７を挿入したコンデンサ挿入型の支持碍子６とにより支持した場合において、主母線２に６．６ｋＶを印加し、Ｓ相の分岐母線３の電圧Ｖの測定と検電器５による検電を行った。この結果、通常の支持碍子により支持した場合には、電圧Ｖが２２８Ｖであり、検電器５は充電状態を検出して動作した。又、コンデンサ挿入型の支持碍子６により支持した場合には、電圧Ｖが４０Ｖであり、検電器５は充電状態を検出せず、不動作であった。又、コンデンサ挿入型支持碍子６により分岐母線３を支持した場合に、真空遮断器１により主母線２と分岐母線３とを接続し、分岐母線３を充電状態にした後に、真空遮断器１を開放した場合の分岐母線３の蓄積電荷Ｑ及び蓄積エネルギーＥは、Ｑ＝ＣＶ＝２５０（ｐＦ）×（√２×６６００Ｖ/√３）＝１．３５（μＣ）＜４５μＣ、Ｅ＝（１/２）ＣＶ2＝（１/２）×２５０（ｐＦ）×（√２×６６００Ｖ/√３）2＝３．６３（ｍＪ）＜３５０（ｍＪ）
一般的に、静電容量Ｃが０．１μＦ以下、蓄積電荷Ｑが４５μＣ、蓄積エネルギーＥが３５０μＪが感電の目安とされているので、コンデンサ挿入型支持碍子６により支持された分岐母線３は感電事故の危険性がないと考えられる。 Next, when a high-voltage distribution board for testing was actually manufactured and the S-phase branch bus 3 was supported by a normal support insulator and a capacitor insertion type support insulator 6 with a 250 pF capacitor 7 inserted, 6.6 kV was applied to 2 and the voltage V of the S-phase branch bus 3 was measured and the voltage was detected by the voltage detector 5. As a result, when supported by a normal support insulator, the voltage V was 228 V, and the voltage detector 5 was operated by detecting the state of charge. Further, when supported by the capacitor insertion type support insulator 6, the voltage V was 40V, and the voltage detector 5 did not detect the state of charge and was inoperative. Further, when the branch bus 3 is supported by the capacitor insertion type support insulator 6, the main bus 2 and the branch bus 3 are connected by the vacuum circuit breaker 1, and after the branch bus 3 is charged, the vacuum circuit breaker 1 is The stored charge Q and stored energy E of the branch bus 3 when opened are Q = CV = 250 (pF) × (√2 × 6600 V / √3) = 1.35 (μC) <45 μC, E = (1 / 2) CV 2 = (1/2) × 250 (pF) × (√2 × 6600 V / √3) 2 = 3.63 (mJ) <350 (mJ)
In general, the electrostatic capacity C is 0.1 μF or less, the stored charge Q is 45 μC, and the stored energy E is 350 μJ. Therefore, the branch bus 3 supported by the capacitor insertion type support insulator 6 is an electric shock. There is no danger of an accident.

この発明の実施最良形態による検電器の充電状態誤検出防止装置の正面図及びその要部拡大図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a charge state erroneous detection preventing device for a voltage detector according to the best embodiment of the present invention and an enlarged view of a main part thereof. 実施最良形態によるコンデンサ挿入型支持碍子の斜視図である。It is a perspective view of the capacitor | condenser insertion type support insulator by embodiment best. 実施最良形態による検電器による分岐母線の検電時の電気的関係図である。It is an electrical relationship figure at the time of the voltage detection of the branch bus by the voltage detector by embodiment best. 従来の高圧受配電盤の内部透視斜視図及び内部の要部正面図である。It is the internal perspective view of the conventional high voltage distribution board, and the principal part front view of an inside.

符号の説明Explanation of symbols

１…真空遮断器
２…主母線
３…分岐母線
５…検電器
６…コンデンサ挿入型支持碍子
７…コンデンサ
８…主回路部
DESCRIPTION OF SYMBOLS 1 ... Vacuum circuit breaker 2 ... Main bus 3 ... Branch bus 5 ... Electric detector 6 ... Capacitor insertion type support insulator 7 ... Capacitor 8 ... Main circuit part

Claims (1)

充電状態の導体の近傍に設けられた非充電状態の導体を検電する検電器において、非充電状態の導体を接地されたコンデンサを有するコンデンサ挿入型の支持碍子により支持したことを特徴とする検電器の充電状態誤検出防止装置。   In a voltage detector for detecting a non-charged conductor provided in the vicinity of a charged conductor, the non-charged conductor is supported by a capacitor insertion type support insulator having a grounded capacitor. Device for preventing erroneous detection of the charging state of electric appliances.
JP2006187413A 2006-07-07 2006-07-07 Device for preventing false detection of charge state of voltage detector Expired - Fee Related JP4940794B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57108162A (en) * 1980-12-25 1982-07-06 Ube Ind Ltd Production of beta-crystalline phase quinacridone pigment
JPS6350760A (en) * 1986-08-20 1988-03-03 Fuji Electric Co Ltd Charging display device
JPH05273261A (en) * 1992-03-25 1993-10-22 Mitsubishi Electric Corp Voltage detection apparatus
JPH07320574A (en) * 1994-05-25 1995-12-08 Nissin Electric Co Ltd Charged conductor supporting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57108162A (en) * 1980-12-25 1982-07-06 Ube Ind Ltd Production of beta-crystalline phase quinacridone pigment
JPS6350760A (en) * 1986-08-20 1988-03-03 Fuji Electric Co Ltd Charging display device
JPH05273261A (en) * 1992-03-25 1993-10-22 Mitsubishi Electric Corp Voltage detection apparatus
JPH07320574A (en) * 1994-05-25 1995-12-08 Nissin Electric Co Ltd Charged conductor supporting device

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