JP2019045458A - Partial discharge measurement instrument and partial discharge measurement method - Google Patents

Partial discharge measurement instrument and partial discharge measurement method Download PDF

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JP2019045458A
JP2019045458A JP2017172256A JP2017172256A JP2019045458A JP 2019045458 A JP2019045458 A JP 2019045458A JP 2017172256 A JP2017172256 A JP 2017172256A JP 2017172256 A JP2017172256 A JP 2017172256A JP 2019045458 A JP2019045458 A JP 2019045458A
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discharge
partial discharge
charge amount
current
signal
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JP6903527B2 (en
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祐樹 藤井
Yuki Fujii
祐樹 藤井
佐々木　欣一
Kinichi Sasaki
欣一 佐々木
高橋　正雄
Masao Takahashi
正雄 高橋
広明 長
Hiroaki Cho
広明 長
勇介 中村
Yusuke Nakamura
勇介 中村
隆 水出
Takashi Mizuide
隆 水出
将邦 樽井
Masakuni Tarui
将邦 樽井
康寿 宮内
Yasuhisa Miyauchi
康寿 宮内
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Toshiba Corp
Toshiba Infrastructure Systems and Solutions Corp
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Toshiba Infrastructure Systems and Solutions Corp
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Abstract

To quantitatively evaluate a charge amount of partial discharge detected from a housing to be measured irrespective of structure of the housing.SOLUTION: A partial discharge measurement instrument comprises a discharge signal generation source, a storage section, a discharge detection unit and a charge amount conversion section. The discharge signal generation source is connected to a ground line or a ground electrode on a circuit of an electrical device which is a partial discharge measurement object and inputs a reference discharge signal with a known discharge charge amount to the ground line or the ground electrode. The storage section stores a coefficient unique to a box body of the electrical device corresponding to an amperage of the reference discharge signal. The discharge detection unit outputs a potential difference corresponding to surface potential of a discharge signal detected by a discharge sensor attached to the box body. The charge amount conversion section outputs the discharge charge amount obtained using the potential difference output from the discharge detection unit and the coefficient in the storage section.SELECTED DRAWING: Figure 1

Description

本発明は、電力機器内部で発生する部分放電の電荷量を定量的に評価を可能とする部分放電測定装置および部分放電測定方法に関する。   The present invention relates to a partial discharge measuring device and a partial discharge measuring method capable of quantitatively evaluating the amount of charge of partial discharge generated inside a power device.

従来、箱体内に遮断器などを収納する例えばスイッチギヤなどの電力機器において、箱体内で発生する部分放電を検出する技術として、例えば部分放電に伴う箱体表面の電位変化を検出し、さらに複数の部分放電センサを取り付けることで、部分放電の発生位置を特定する部分放電測定装置が知られている。   Conventionally, in a power device such as a switchgear for storing a circuit breaker or the like in a box, as a technique for detecting a partial discharge generated in the box, for example, a potential change on the surface of the box accompanying the partial discharge is detected. A partial discharge measuring device is known which specifies the generation position of a partial discharge by attaching a partial discharge sensor.

部分放電測定装置は、箱体内で浮遊容量を介して伝搬する部分放電パルスによる放電信号を箱体の表面に取り付けた部分放電センサで検出し、部分放電発生部位から発生した放電信号が部分放電センサに到達するまでの時間差から三次元位置（箱体内部空間上の放電発生位置）も特定できるようになっている。   The partial discharge measurement device detects the discharge signal by the partial discharge pulse propagating through the floating capacity in the box body by the partial discharge sensor attached to the surface of the box, and the discharge signal generated from the partial discharge generation site is a partial discharge sensor The three-dimensional position (the position at which the discharge occurs on the inner space of the box) can also be specified from the time difference until reaching the position.

このように部分放電測定装置は、箱体やモールド部材内部で発生する部分放電発生部位を特定するものであるが、箱体表面の電位変化量は、同じ放電電荷量であっても測定対象である電力機器の内部構造によって変動するため、部分放電測定装置が検出する部分放電の電荷量が正しい値かどうかを定量的に評価できない。   As described above, the partial discharge measuring device specifies the partial discharge generation site generated inside the box or the mold member, but even if the amount of potential change on the surface of the box is the same as the amount of discharge charge Because it varies depending on the internal structure of a certain power device, it can not be quantitatively evaluated whether the amount of charge of the partial discharge detected by the partial discharge measurement device is the correct value.

特許５４９３９０９号公報Patent No. 5493909

本発明はこのような課題を解決するためになされたもので、測定対象の筐体の構造によらず、筐体から検出する部分放電の電荷量を定量的に評価できる部分放電測定装置および部分放電測定方法を提供することにある。   The present invention has been made to solve such a problem, and a partial discharge measuring device and a part capable of quantitatively evaluating the charge amount of the partial discharge detected from the housing regardless of the structure of the housing to be measured An object of the present invention is to provide a discharge measurement method.

実施形態の部分放電測定装置は、放電信号発生源、記憶部、放電検出ユニット、電荷量換算部を備える。放電信号発生源は部分放電の計測対象の電気機器の回路上の接地線または接地極に接続され、放電電荷量が既知の参照放電信号を接地線または接地極に入力する。記憶部には参照放電信号の電流量に応じた電気機器の箱体固有の係数が記憶されている。放電検出ユニットは箱体に取り付けた放電センサにより検出される放電信号の表面電位に応じた電位差を出力する。電荷量換算部は放電検出ユニットより出力される電位差と記憶部の係数とから求めた放電電荷量を出力する。   The partial discharge measurement device of the embodiment includes a discharge signal generation source, a storage unit, a discharge detection unit, and a charge amount conversion unit. The discharge signal generation source is connected to a ground line or a ground pole on the circuit of the electrical device to be measured for partial discharge, and inputs a reference discharge signal whose discharge charge amount is known to the ground line or the ground pole. The storage unit stores a box-specific coefficient of the electric device according to the amount of current of the reference discharge signal. The discharge detection unit outputs a potential difference corresponding to the surface potential of the discharge signal detected by the discharge sensor attached to the box. The charge amount conversion unit outputs a discharge charge amount obtained from the potential difference output from the discharge detection unit and the coefficient of the storage unit.

第１実施形態の部分放電測定システムの概要構成を示す図である。It is a figure which shows schematic structure of the partial discharge measurement system of 1st Embodiment. 部分放電信号を示す図である。It is a figure which shows a partial discharge signal. 図１の部分放電測定システムに用いる部分放電信号発生源の構成を示す図である。It is a figure which shows the structure of the partial discharge signal generation source used for the partial discharge measurement system of FIG. 部分放電測定装置の動作を説明するための図である。It is a figure for demonstrating the operation | movement of a partial discharge measuring apparatus. 第２実施形態を示す図である。It is a figure which shows 2nd Embodiment. 第３実施形態を示す図である。It is a figure which shows 3rd Embodiment. 第４実施形態を示す図である。It is a figure which shows 4th Embodiment. 第５実施形態を示す図である。It is a figure which shows 5th Embodiment.

以下、図面を参照して本発明の実施の形態を詳細に説明する。
（第１実施形態）
図１〜図４を参照して第１実施形態の部分放電測定システムを説明する。図１は第１実施形態の部分放電測定システムの構成を示す図、図２は図１の部分放電測定システムの部分放電信号発生源の構成を示す図、図３は部分放電信号を説明するための図、図４は部分放電測定装置の動作を説明するための図である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First Embodiment
The partial discharge measurement system of the first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a view showing the configuration of the partial discharge measurement system according to the first embodiment, FIG. 2 is a view showing the configuration of a partial discharge signal generation source of the partial discharge measurement system of FIG. FIG. 4 is a diagram for explaining the operation of the partial discharge measurement device.

図１に示すように、第１実施形態の部分放電測定システムは、例えばスイッチギヤなどと呼ばれる電力機器に発生する部分放電を検出する部分放電測定装置２を備える。   As shown in FIG. 1, the partial discharge measurement system according to the first embodiment includes a partial discharge measurement device 2 that detects a partial discharge generated in a power device called, for example, a switch gear or the like.

電力機器の箱体１の内部には、遮断器や主回路導体などの電気機器１２が収容されている。電気機器１２は、接地線１３を通じて接地極１４に接続されている。接地極１４は接地されている。電気機器１２には電力供給源１１（送配電系統など）からの電源線１５（高圧配電線）が接続されている。   An electric device 12 such as a circuit breaker or a main circuit conductor is accommodated inside the box 1 of the power device. The electrical device 12 is connected to the ground pole 14 through the ground wire 13. The ground electrode 14 is grounded. The electric equipment 12 is connected to a power supply line 15 (high voltage distribution line) from a power supply source 11 (a transmission and distribution system etc.).

ここで、箱体１は、外壁を構成する複数の金属の構成板（正面板、天井板、背面板、床板、側面板など）を備える筐体である。構成板は、接地線１３を介して接地極１４に接続される。   Here, the box 1 is a housing provided with a plurality of metal constituent plates (a front plate, a ceiling plate, a back plate, a floor plate, a side plate, and the like) which constitute an outer wall. The component board is connected to the ground pole 14 via the ground line 13.

部分放電測定装置２は、部分放電検出ユニット２０と、部分放電電荷量校正ユニット３０とを有し、電力機器内部で発生する部分放電を測定する機器であり、部分放電電荷量評価のための校正機能を備える。   The partial discharge measurement device 2 has a partial discharge detection unit 20 and a partial discharge charge calibration unit 30, and is a device for measuring a partial discharge generated inside the power device, and is a calibration for evaluating the partial discharge charge. It has a function.

部分放電検出ユニット２０は、箱体１の構成板に接触させて固定した放電センサとしての電極２１、電位信号増幅部２２、この電位信号増幅部２２に伝送線２３を介して接続された部分放電検出部２４を有する。伝送線２３は例えば同軸ケーブルなどを用いるものとする。つまり部分放電検出ユニット２０は、箱体１の外面に取り付けた電極２１により検出される放電信号（パルス電流ｉ１）の表面電位ｖ１に応じた電位差ΔＶを出力する。 The partial discharge detection unit 20 includes an electrode 21 as a discharge sensor fixed in contact with a component plate of the box 1 and fixed thereto, a potential signal amplification unit 22, and a partial discharge connected to the potential signal amplification unit 22 via a transmission line 23. A detection unit 24 is provided. The transmission line 23 uses, for example, a coaxial cable. That partial discharge detection unit 20 outputs a potential difference ΔV in accordance with the surface potential v 1 of the discharge signal detected by the electrode 21 attached to the outer surface of the box 1 (pulse current i 1).

電極２１は、箱体１の構成板との間で形成される浮遊容量を介して部分放電に伴う箱体１の表面電位ｖ１（の変化）を検出しそれを出力信号として電位信号増幅部２２へ出力する。 The electrode 21 detects (the change of) the surface potential v 1 of the box 1 associated with the partial discharge via the floating capacitance formed between the plate 1 and the box 1 and uses it as an output signal to generate a potential signal amplifier Output to 22

電位信号増幅部２２は、電極２１より入力された表面電位ｖ１を増幅および電流ｉ2に変換して伝送線２３を介して部分放電検出部２４に入力する。このように電位信号増幅部２２を設けることで、電極２１により検知された箱体１の表面電位ｖ１を高インピーダンスで受け、電流ｉ2に変換して後段の伝送線２３に伝送することで、伝送線２３の配線の長さ、引き回しによる影響を抑制することができる。 Potential signal amplifier 22 inputs by converting the surface potential v 1 input from the electrode 21 to the amplifier and the current i 2 through the transmission line 23 to the partial discharge detection unit 24. By thus providing the potential signal amplifying unit 22 receives the surface potential v 1 of the detected box body 1 by the electrode 21 at a high impedance, by transmitting and converted into a current i 2 at the subsequent stage of the transmission line 23 The influence of the wiring length of the transmission line 23 and routing can be suppressed.

表面電位ｖ１の周波数成分は、１ＭＨｚ以上であることから、電位信号増幅部２２は、その周波数を検出可能な周波数帯域のものを用いる。電位信号増幅部２２は、箱体１の接地極１４に接続し、接地（アース）するものとする。このようにすることで電位信号増幅部２２での接地の基準が接地極１４に定まり、部分放電に伴う箱体１の表面電位ｖ１の変化を正確に計測できる。 Frequency component of the surface potential v 1, since at 1MHz or more, the potential signal amplifier 22, used as a detectable frequency band of the frequency. The potential signal amplification unit 22 is connected to the ground electrode 14 of the box 1 and grounded. Such reference ground in potential signal amplifier 22 by the the Sadamari the ground electrode 14, a change in surface potential v 1 of the box body 1 with the partial discharge can be accurately measured.

部分放電電荷量校正ユニット３０は、放電信号発生源としての部分放電信号発生源３１と、部分放電電流計測部３２と、この部分放電電流計測部３２と信号線３３を介して接続された部分放電電荷量換算部３４と、記憶部３５とを有する。   The partial discharge charge calibration unit 30 includes a partial discharge signal generation source 31 as a discharge signal generation source, a partial discharge current measurement unit 32, and a partial discharge connected to the partial discharge current measurement unit 32 via the signal line 33. A charge amount conversion unit 34 and a storage unit 35 are provided.

部分放電信号発生源３１は、校正の際に、部分放電の計測対象の電子機器１２の回路上の接地線１３または接地極１４に入力線１０を介して接続される。部分放電信号発生源３１は、放電電荷量が既知の参照放電信号Ｓ１（パルス電流ｉ）を発生し、入力線１０を通じて接地線１３または接地極１４に入力する。部分放電電流計測部３２は、部分放電信号発生源３１から発生された参照放電信号Ｓ１が入力線１０を通る際のパルス電流ｉを計測する。   The partial discharge signal generation source 31 is connected to the ground line 13 or the ground pole 14 on the circuit of the electronic device 12 to be measured of the partial discharge via the input line 10 at the time of calibration. The partial discharge signal generation source 31 generates a reference discharge signal S1 (pulse current i) whose discharge charge amount is known, and inputs the reference discharge signal S1 to the ground line 13 or the ground electrode 14 through the input line 10. The partial discharge current measurement unit 32 measures a pulse current i when the reference discharge signal S1 generated from the partial discharge signal generation source 31 passes through the input line 10.

部分放電電流計測部３２は、入力線１０と絶縁しつつ入力線１０に流れる電流量を計測するために、例えば貫通型のカレントトランス（以下「ＣＴ」と称す）などを使用する。信号線３３は、例えば同軸ケーブルなどである。   The partial discharge current measurement unit 32 uses, for example, a penetrable current transformer (hereinafter referred to as “CT”) or the like in order to measure the amount of current flowing through the input line 10 while insulating it from the input line 10. The signal line 33 is, for example, a coaxial cable.

記憶部３５には、参照放電信号Ｓ１（パルス電流ｉ）の電流量に応じた電子機器１２の箱体１固有の係数αが記憶されている。   The storage unit 35 stores a coefficient α specific to the box 1 of the electronic device 12 according to the current amount of the reference discharge signal S1 (pulse current i).

部分放電電荷量換算部３４には、部分放電検出部２４の出力信号（電位差ΔＶ）と、部分放電電流計測部３２の出力信号（検出された電流ｉ）とが入力される。   The partial discharge charge conversion unit 34 receives the output signal (potential difference ΔV) of the partial discharge detection unit 24 and the output signal (detected current i) of the partial discharge current measurement unit 32.

部分放電電荷量換算部３４は、入力された出力信号（電位差ΔＶ）を部分放電電荷量Ｑに換算し出力する。つまり部分放電電荷量換算部３４は、放電検出ユニット２０より出力される電位差ΔＶと記憶部３５の係数αとから求めた放電電荷量Ｑを出力する。
また部分放電電荷量換算部３４は、部分放電電流計測部３２からの出力信号（電流ｉ）を部分放電電荷量Ｑｒｅｆに換算し出力する。 The partial discharge charge conversion unit 34 converts the input output signal (potential difference ΔV) into a partial discharge charge Q and outputs it. That is, the partial discharge charge conversion unit 34 outputs the discharge charge amount Q obtained from the potential difference ΔV output from the discharge detection unit 20 and the coefficient α of the storage unit 35.
The partial discharge charge conversion unit 34 converts the output signal (current i) from the partial discharge current measurement unit 32 into a partial discharge charge amount Q ref and outputs it.

なお、部分放電電流計測部３２により検出される電流ｉから換算した部分放電電荷量Ｑｒｅｆが既知の部分放電電荷量Ｑｒｅｆとほぼ同じ場合は、既知の部分放電電荷量Ｑｒｅｆを予め記憶部３５に記憶しておき、それを実測の部分放電電荷量Ｑとの比較に用いてもよい。 Incidentally, substantially the case same as the partial discharge partial discharge charge quantity converted from the current i detected by the current measuring unit 32 Q ref is the known partial discharge charge quantity Q ref, previously stored portions of known partial discharge charge quantity Q ref It may be stored in 35 and used for comparison with the actual amount of partial discharge charge Q.

部分放電電荷量を校正する際、放電電荷量が既知の部分放電信号発生源３１を、入力線１０を介して接地線１３に接続する。接地線１３への接続／解放には切り替えスイッチを利用する。   When calibrating the amount of partial discharge charge, the partial discharge signal generation source 31 whose discharge charge amount is known is connected to the ground line 13 via the input line 10. A switch is used to connect / release the ground line 13.

ここで、部分放電信号発生源３１により発生される参照放電信号Ｓ１は、箱体１内で生じる部分放電の信号を模擬するために、既知の放電電荷量Ｑｒｅｆを有し、図２に示すように、立ち上がり時間が３０ｎｓｅｃ以下のパルス信号（電圧）である必要がある。 Here, the reference discharge signal S1 generated by the partial discharge signal generation source 31 has a known discharge charge amount Q ref in order to simulate the signal of the partial discharge generated in the box 1 and is shown in FIG. Thus, the pulse signal (voltage) needs to have a rise time of 30 nsec or less.

この条件を満たすために、部分放電信号発生源３１は、図３に示すように、一方の端子を入力線１０に接続し、他方の端子を箱体１に接続（接地）した圧電素子４２を用いる。また、立ち上がり時間を３０ｎｓｅｃ以下に制御するために、圧電素子４２と入力線１０との間にコンデンサ４１などの波形整形素子を挿入するものとする。なお、ここに示す部分放電信号発生源３１の構成は一例であり、他の構成であってもよい。   In order to satisfy this condition, as shown in FIG. 3, the partial discharge signal generation source 31 has one terminal connected to the input line 10 and the other terminal connected to the box 1 (ground). Use. Further, in order to control the rise time to 30 nsec or less, a waveform shaping element such as a capacitor 41 is inserted between the piezoelectric element 42 and the input line 10. In addition, the structure of the partial discharge signal generation source 31 shown here is an example, and another structure may be sufficient.

以下、図４を参照してこの第１実施形態の部分放電測定装置２の部分放電電荷量の求め方について説明する。
図４に示すように、部分放電信号発生源３１から参照放電信号Ｓ１を発生し、既知の放電電荷量Ｑｒｅｆのパルス電流である電流ｉを箱体１内の接地線１３に入力するとき、大部分の電流ｉ０は、接地極１４からアースに流出するが、そのうち一部分の電流ｉ１が箱体１の外面（構成板）に流入（伝達）する。 Hereinafter, how to obtain the partial discharge charge amount of the partial discharge measurement device 2 of the first embodiment will be described with reference to FIG.
As shown in FIG. 4, when the reference discharge signal S1 is generated from the partial discharge signal generation source 31 and the current i which is a pulse current of the known discharge charge amount Q ref is input to the ground line 13 in the box 1, Most of the current i 0 flows out from the ground electrode 14 to the ground, and a part of the current i 1 flows (transfers) to the outer surface (component plate) of the box 1.

この箱体１の外面（構成板）に一部流入した電流ｉ１は、表面電位ｖ１を励起し、構成板の板面に取り付けられた電極２１で検出され、伝送線２３を通じて部分放電検出部２４に入力される。部分放電検出部２４では、電位信号増幅部２２により増幅された電流ｉ2を伝送線２３を介して受信して電位差ΔＶに変換し、電位差ΔＶを放電電荷量換算部３４に入力する。 The current i 1 partially flowing into the outer surface (component plate) of the box 1 excites the surface potential v 1 and is detected by the electrode 21 attached to the plate surface of the component plate, and partial discharge detection through the transmission line 23 It is input to the part 24. The partial discharge detection unit 24, converts the potential difference ΔV is received via the transmission line 23 the current i 2, which is amplified by the potential signal amplifier 22 inputs the potential difference ΔV to discharge charge quantity converting unit 34.

ここで、部分放電信号発生源３１から発生し部分放電電流計測部３２で計測されるパルス電流ｉと放電電荷量Ｑ、ならびに表面電位ｖ１（電位差ΔＶ）は相関関係にあることから、放電電荷量Ｑと表面電位ｖ１（電位差ΔＶ）は係数αを用いて、Ｑ＝α×ｖ１と表すことができる。ｖ１をΔＶと置き換えてもよい。 Here, since the pulse current i and the discharge charge amount Q generated from the partial discharge signal generation source 31 and measured by the partial discharge current measurement unit 32 and the surface potential v 1 (potential difference ΔV) are in correlation, the discharge charge The quantity Q and the surface potential v 1 (potential difference ΔV) can be expressed as Q = α × v 1 using the factor α. v 1 may be replaced with ΔV.

係数αは、参照放電信号Ｓ１（パルス電流ｉ）の電流量に応じた電子機器１２の箱体１固有の係数である。この係数αは、放電電荷量換算部３４での演算に使用するため、予め記憶部３５に記憶しておくものとする。   The coefficient α is a coefficient unique to the box 1 of the electronic device 12 according to the amount of current of the reference discharge signal S1 (pulse current i). This coefficient α is stored in advance in the storage unit 35 in order to be used for the calculation in the discharge charge converting unit 34.

放電電荷量換算部３４では、入力された電位差ΔＶと記憶部３５の係数αを用いて放電電荷量Ｑを算出し出力、つまり電位差ΔＶを、計数αを用いて放電電荷量Ｑに換算し出力する。換算には、電位差ΔＶ以外に表面電位ｖ１を用いてもよい。 The discharge charge conversion unit 34 calculates the discharge charge Q using the input potential difference ΔV and the coefficient α of the storage unit 35 and converts the output, that is, the potential difference ΔV into the discharge charge Q using the count α, and outputs Do. The terms may be used the surface potential v 1 in addition to the potential difference [Delta] V.

（部分放電測定動作）
この部分放電測定システムにおいて、実際に電力機器の箱体１内部の部分放電を測定する際には、入力線１０を接地線１３から切り離し、箱体１内部の電気機器１２を動作させる。そして、箱体１から電極２１が検出した電流ｉ１の表面電位ｖ１を部分放電検出部２４にて電位差ΔＶに変換し放電電荷量換算部３４に入力し、放電電荷量換算部３４は入力された電位差ΔＶに係数αを積算し、部分放電電荷量Ｑに換算しその電荷量Ｑの値を出力する。 (Partial discharge measurement operation)
In this partial discharge measurement system, when actually measuring the partial discharge inside the box 1 of the power device, the input line 10 is disconnected from the ground line 13 and the electric device 12 inside the box 1 is operated. Then, into a potential difference ΔV is input to the discharge charge quantity converting unit 34 and the surface potential v 1 of the current i 1 to the electrode 21 from the box 1 is detected by the partial discharge detection unit 24, discharge charge quantity converting unit 34 is input The coefficient α is integrated with the potential difference ΔV, converted into the partial discharge charge amount Q, and the value of the charge amount Q is output.

以上説明したように、第１実施形態によれば、校正の際に、入力線１０を接地線１３に接続して部分放電信号発生源３１から発生させた既知の参照放電信号Ｓ１（パルス電流ｉ）を接地線１３に入力すると、接地線１３から箱体１の外面を通じて電極２１により検出された電流ｉ１の表面電位ｖ１が電流ｉ2として部分放電検出部２４に入力されて電位差ΔＶに変換されて部分放電電荷量校正ユニット３０に入力される。 As described above, according to the first embodiment, the known reference discharge signal S1 (pulse current i) generated from the partial discharge signal generation source 31 by connecting the input line 10 to the ground line 13 at the time of calibration. ) If you enter the ground line 13, to be input potential difference ΔV to the partial discharge detection unit 24 as the surface potential v 1 current i 2 of the current i 1 which is detected by the electrode 21 through the outer surface of the box 1 from the ground line 13 It is converted and input to the partial discharge charge calibration unit 30.

つまり電極２１により検出される電流ｉ１は、電気機器１２の箱体１の内部構成によらず、接地線１３や接地極１４と箱体１の外面の構成板の接続状況によって決定されるため、部分放電測定装置２では、既知の参照放電信号Ｓ１（パルス信号）を電気機器１２の接地線１３に入力して箱体１の外面に取り付けた電極２１で検出し信号処理することで、部分放電の大きさ（放電電荷量Ｑ）を定量的に評価（校正）することができる。 That is, the current i 1 detected by the electrode 21 is determined by the connection condition of the ground wire 13 or the ground electrode 14 and the component plate of the outer surface of the box 1 regardless of the internal configuration of the box 1 of the electric device 12 In the partial discharge measuring device 2, a known reference discharge signal S 1 (pulse signal) is input to the ground wire 13 of the electric device 12 and detected and signal-processed by the electrode 21 attached to the outer surface of the box 1. The magnitude of the discharge (discharge charge amount Q) can be quantitatively evaluated (calibrated).

図５を参照して第２実施形態を説明する。
上記第１実施形態（図１参照）では、電位信号増幅部２２から接地極１４へ接地線２２ａを接続することを説明したが、この第２実施形態では、図１と同様の効果を得る他の構成例として、図５に示すように、電極２１と電位信号増幅部２２との間に差分算出器２９を介在させて、差分算出器２９から配線した接地線２９ａの先端に設けた電極１６を接地極１４に接触固定してもよい。また電極１６を接地極１４に接触固定する以外にも、例えば電極１６を箱体１の構成板に取り付けるようにしてもよい。 The second embodiment will be described with reference to FIG.
In the first embodiment (see FIG. 1), the connection of the ground line 22a from the potential signal amplifier 22 to the ground electrode 14 has been described, but in the second embodiment, other effects similar to those of FIG. As shown in FIG. 5, as an example of the configuration, as shown in FIG. 5, the difference calculator 29 is interposed between the electrode 21 and the potential signal amplifier 22, and the electrode 16 provided at the tip of the ground line 29a wired from the difference calculator 29. May be fixed in contact with the ground electrode 14. In addition to the contact fixing of the electrode 16 to the ground electrode 14, for example, the electrode 16 may be attached to the component plate of the box 1.

図６を参照して第３実施形態を説明する。
図６に示すように、この第３実施形態の部分放電信号発生源３１は、電池などの定電圧電源４３とスイッチング素子４４を用いて部分放電信号発生回路を構成する。 A third embodiment will be described with reference to FIG.
As shown in FIG. 6, the partial discharge signal generation source 31 of the third embodiment constitutes a partial discharge signal generation circuit using a constant voltage power supply 43 such as a battery and a switching element 44.

この場合、上記第１実施形態（図２）と同様に、コンデンサ等の素子４１を挿入することで部分放電信号発生源３１が発生する放電信号Ｓ１の立ち上がり時間を３０ｎｓｅｃ以下に制御する。   In this case, as in the first embodiment (FIG. 2), the rising time of the discharge signal S1 generated by the partial discharge signal generation source 31 is controlled to 30 nsec or less by inserting the element 41 such as a capacitor.

図７を参照して第４実施形態を説明する。
図７に示すように、この第４実施形態の部分放電信号発生源３１は、出力端子と入力端子の二端子を備え、各端子（出力端子と入力端子）と接地線１３とを入力線１０ａ、出力線１０ｂでそれぞれ接続する。この場合、出力線１０ｂの側に部分放電電流計測部３２を設ける。 A fourth embodiment will be described with reference to FIG.
As shown in FIG. 7, the partial discharge signal generating source 31 of the fourth embodiment has two terminals, an output terminal and an input terminal, and each terminal (output terminal and input terminal) and the ground line 13 are connected to the input line 10a. And output lines 10b. In this case, a partial discharge current measurement unit 32 is provided on the side of the output line 10b.

この第４実施形態では、部分放電信号発生源３１から発生した部分放電信号Ｓ１を、破線矢印Ａで示すように、入力線１０ａを通じて接地線１３に流し、接地線１３から出力線１０ｂを通じて部分放電信号発生源３１に戻すようにする。出力線１０ｂに流れる部分放電のパルス電流ｉが部分放電電流計測部３２により検出されて、部分放電電荷量換算部３４に入力される。   In the fourth embodiment, the partial discharge signal S1 generated from the partial discharge signal source 31 is supplied to the ground line 13 through the input line 10a as shown by the broken arrow A, and is partially discharged from the ground line 13 through the output line 10b. It is returned to the signal source 31. The pulse current i of the partial discharge flowing through the output line 10 b is detected by the partial discharge current measurement unit 32 and input to the partial discharge charge conversion unit 34.

この第４実施形態によれば、上記実施形態と同様の効果が得られる以外に、部分放電信号発生源３１から接地線１３へ出力し接地線１３を通じて戻ってくる部分放電信号Ｓ１を部分放電電流計測部３２が検出することで、測定誤差がより少なくなる。   According to the fourth embodiment, the partial discharge signal S1 output from the partial discharge signal generation source 31 to the ground line 13 and returned through the ground line 13 is used as a partial discharge current, in addition to the same effect as the above embodiment. The detection by the measuring unit 32 further reduces the measurement error.

図８を参照して第５実施形態を説明する。
図８に示すように、この第５実施形態は、判定部４を有する。判定部４は、図１、図５に示した部分放電電荷量換算部３４の出力（放電電荷量Ｑ）が、誤差範囲（許容範囲）内にあるか否かの判定結果を出力する。 The fifth embodiment will be described with reference to FIG.
As shown in FIG. 8, the fifth embodiment includes a determination unit 4. Determination unit 4 outputs a determination result as to whether the output (discharge charge amount Q) of partial discharge charge conversion unit 34 shown in FIGS. 1 and 5 is within an error range (permissible range).

より具体的には、判定部４は、部分放電電荷量換算部３４から出力された放電電荷量Ｑと放電信号発生源３１により発生される参照放電信号Ｓ１の既知の放電電荷量Ｑｒｅｆ）との差分値が予め記憶（設定）していた許容範囲（誤差範囲）内か否かを判定し、判定結果に応じた情報（許容範囲内であればOK、許容範囲を超えていればNGなど）を出力する。なお、判定結果に、求めた差分値と許容範囲を含めて出力してもよい。予め設定した許容範囲としては、例えば±０．５％などの誤差範囲とする。 More specifically, determination unit 4 determines a discharge charge amount Q output from partial discharge charge conversion unit 34 and a known discharge charge amount Q ref of reference discharge signal S1 generated by discharge signal generation source 31 It is determined whether the difference value of is within the allowable range (error range) previously stored (set), and information according to the determination result (OK if within the allowable range, NG if exceeding the allowable range, etc. Output). The determination result may be output including the determined difference value and the allowable range. The tolerance set in advance is, for example, an error range such as ± 0.5%.

本発明の実施の形態を説明したが、この実施の形態は、例として示したものであり、この他の様々な形態で実施が可能であり、発明の要旨を逸脱しない範囲で、構成要素の省略、置き換え、変更を行うことができる。   Although the embodiment of the present invention has been described, this embodiment is shown as an example, and can be implemented in other various forms, and within the scope of the present invention, You can omit, replace, or change.

また上記の実施の形態に示した部分放電測定装置２の各構成要素を、コンピュータのハードディスク装置などのストレージにインストールしたプログラムで実現してもよく、また上記プログラムを、コンピュータ読取可能な電子媒体：electronic mediaに記憶しておき、プログラムを電子媒体からコンピュータに読み取らせることで本発明の機能をコンピュータが実現するようにしてもよい。電子媒体としては、例えばＣＤ−ＲＯＭ等の記録媒体やフラッシュメモリ、リムーバブルメディア：Removable media等が含まれる。さらに、ネットワークを介して接続した異なるコンピュータに構成要素を分散して記憶し、各構成要素を機能させたコンピュータ間で通信することで実現してもよい。   Further, each component of the partial discharge measurement device 2 described in the above embodiment may be realized by a program installed in a storage such as a hard disk drive of a computer, or the above program may be a computer readable electronic medium: The functions of the present invention may be realized by a computer by storing the program in electronic media and reading the program from an electronic medium by the computer. Examples of the electronic medium include a recording medium such as a CD-ROM, a flash memory, and a removable medium: removable media. Furthermore, the components may be distributed and stored in different computers connected via a network, and may be realized by communicating between the computers functioning the respective components.

１…箱体、２…部分放電測定装置、１０…入力線、１１…主電源、１２…電気機器、１３…接地線、１４…接地極、１５…電源線、２０…部分放電検出ユニット、２１…電極、２２…電位信号増幅部、２３…伝送線、３０…部分放電電荷量校正ユニット、３１…部分放電信号発生源、３２…部分放電電流計測部、３３…信号線、３４…部分放電電荷量換算部、３５…記憶部。   DESCRIPTION OF SYMBOLS 1 ... Box body, 2 ... Partial discharge measuring device, 10 ... Input line, 11 ... Main power supply, 12 ... Electric equipment, 13 ... Grounding line, 14 ... Grounding pole, 15 ... Power supply line, 20 ... Partial discharge detection unit, 21 ... Electrodes 22 Potential signal amplifier 23 Transmission line 30 Partial discharge charge calibration unit 31 Partial discharge signal generation source 32 Partial discharge current measurement unit 33 Signal line 34 Partial discharge charge Amount conversion unit, 35 ... storage unit.

Claims (6)

部分放電の計測対象の電気機器の回路上の接地線または接地極に接続され、放電電荷量が既知の参照放電信号を前記接地線または前記接地極に入力する放電信号発生源と、
前記参照放電信号の電流量に応じた前記電気機器の箱体固有の係数が記憶された記憶部と、
前記箱体に取り付けた放電センサにより検出される放電信号の表面電位に応じた電位差を出力する放電検出ユニットと、
前記放電検出ユニットより出力される電位差と前記記憶部の係数とから求めた放電電荷量を出力する電荷量換算部と
を具備する部分放電測定装置。 A discharge signal generation source connected to a ground wire or ground pole on the circuit of the electrical device to be measured for partial discharge, and inputting a reference discharge signal whose discharge charge amount is known to the ground wire or ground electrode;
A storage unit storing a box-specific coefficient of the electric device according to the amount of current of the reference discharge signal;
A discharge detection unit that outputs a potential difference corresponding to a surface potential of a discharge signal detected by a discharge sensor attached to the box;
A partial discharge measuring device comprising: a charge amount conversion unit that outputs a discharge charge amount obtained from the potential difference output from the discharge detection unit and the coefficient of the storage unit. 前記放電信号発生源により発生される参照放電信号の既知の放電電荷量と、前記電荷量換算部から出力された放電電荷量との差分値が予め設定した許容範囲内か否かを判定し、判定結果に応じた情報を出力する判定部を具備する請求項１項に記載の部分放電測定装置。   It is determined whether a difference value between a known discharge charge amount of a reference discharge signal generated by the discharge signal generation source and a discharge charge amount output from the charge amount conversion unit is within a preset allowable range. The partial discharge measurement device according to claim 1, further comprising: a determination unit that outputs information according to the determination result. 前記放電検出ユニットは、
前記放電センサにより検出される箱体の表面電位を増幅および電流に変換する信号増幅部と、
前記信号増幅部により増幅された電流を伝送線を介して受信し電圧差に変換する部分放電検出部と
を有する請求項１項に記載の部分放電測定装置。 The discharge detection unit is
A signal amplification unit that amplifies and converts the surface potential of the box detected by the discharge sensor into a current;
The partial discharge measurement device according to claim 1, further comprising: a partial discharge detection unit that receives the current amplified by the signal amplification unit via a transmission line and converts the current into a voltage difference. 部分放電の計測対象の電気機器の回路上の接地線または接地極に接続された放電信号発生源から、放電電荷量が既知の参照放電信号を前記接地線または前記接地極に入力し、
前記参照放電信号の電流量に応じた前記電気機器の箱体固有の係数を記憶し、
前記箱体に取り付けた放電センサにより検出される放電信号の表面電位に応じた電位差と前記係数とから求めた放電電荷量を出力する部分放電測定方法。 A reference discharge signal whose discharge charge amount is known is input to the ground line or the ground pole from a discharge signal generation source connected to the ground line or ground electrode on the circuit of the electrical device to be measured for partial discharge;
Storing a box-specific coefficient of the electric device according to the amount of current of the reference discharge signal;
The partial discharge measuring method which outputs the discharge charge amount calculated | required from the electrical potential difference according to the surface potential of the discharge signal detected by the discharge sensor attached to the said box, and the said coefficient. 前記放電信号発生源により発生される参照放電信号の既知の放電電荷量と、前記放電信号と係数とから求めた放電電荷量との差分値が予め設定した許容範囲内か否かを判定し、判定結果に応じた情報を出力する請求項４に記載の部分放電測定方法。   It is determined whether or not a difference value between a known discharge charge amount of a reference discharge signal generated by the discharge signal generation source and a discharge charge amount obtained from the discharge signal and the coefficient falls within a preset allowable range. The partial discharge measuring method according to claim 4, which outputs information according to the determination result. 前記放電センサにより検出される前記箱体の表面電位を増幅し電流に変換して伝送し、
伝送した前記電流を電位差に変換する
請求項４項に記載の部分放電測定方法。 The surface potential of the box detected by the discharge sensor is amplified, converted into a current, and transmitted,
The partial discharge measurement method according to claim 4, wherein the transmitted current is converted into a potential difference.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05256896A (en) * 1992-03-13 1993-10-08 Fujikura Ltd Method for calibrating resonance type partial discharge detector
JPH1114693A (en) * 1997-06-23 1999-01-22 Osaka Gas Co Ltd Method and apparatus for measuring partial discharge of electric apparatus
JP2011252779A (en) * 2010-06-02 2011-12-15 Tohoku Electric Power Co Inc Detection method of partial discharge of electrical device using magnetic field probe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05256896A (en) * 1992-03-13 1993-10-08 Fujikura Ltd Method for calibrating resonance type partial discharge detector
JPH1114693A (en) * 1997-06-23 1999-01-22 Osaka Gas Co Ltd Method and apparatus for measuring partial discharge of electric apparatus
JP2011252779A (en) * 2010-06-02 2011-12-15 Tohoku Electric Power Co Inc Detection method of partial discharge of electrical device using magnetic field probe

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