JPH06123756A - Insulation deterioration diagnosis method for high voltage overhead distribution cable - Google Patents
Insulation deterioration diagnosis method for high voltage overhead distribution cableInfo
- Publication number
- JPH06123756A JPH06123756A JP5103746A JP10374693A JPH06123756A JP H06123756 A JPH06123756 A JP H06123756A JP 5103746 A JP5103746 A JP 5103746A JP 10374693 A JP10374693 A JP 10374693A JP H06123756 A JPH06123756 A JP H06123756A
- Authority
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- Japan
- Prior art keywords
- signal
- distribution
- partial discharge
- insulation deterioration
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、部分放電（電位変動
信号）検出による配電用高圧架空ケーブル分岐接続体
（以下、接続体と称す）の絶縁劣化診断において、部分
放電信号のノイズ成分を減少させることによって判定を
容易に、かつ、精度良く行うことができる新規な部分放
電信号の検出方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces the noise component of a partial discharge signal in the diagnosis of insulation deterioration of a distribution high-voltage overhead cable branch connection (hereinafter referred to as a connection) by detecting partial discharge (potential fluctuation signal). The present invention relates to a novel method for detecting a partial discharge signal, which enables determination to be performed easily and accurately by doing so.
【０００２】[0002]
【従来の技術】接続体内部において絶縁劣化が生じると
部分放電が発生する。その部分放電の発生状態を、部分
放電発生部と電極を容量結合させるよう接続体筐体外側
に電極を設置して、その電極の電位変動分を信号（以
下、部分放電信号と称す）として検出し、その信号を分
析することで接続体の絶縁劣化状態を診断する方法が知
られている。従来は、電極一つ一つの信号を個々に分析
して絶縁劣化状態を判定してきた。以下、接続体の形状
と電極設置位置の一例を説明する。2. Description of the Related Art Partial discharge occurs when insulation deterioration occurs inside a connector. The state of occurrence of the partial discharge is detected by setting an electrode on the outside of the casing of the connecting body so as to capacitively couple the partial discharge generation part and the electrode, and detecting the potential fluctuation of the electrode as a signal (hereinafter referred to as a partial discharge signal). Then, a method of diagnosing the insulation deterioration state of the connection body by analyzing the signal is known. Conventionally, the signal of each electrode is individually analyzed to determine the insulation deterioration state. Hereinafter, an example of the shape of the connection body and the electrode installation position will be described.
【０００３】接続体として、図４に一般的なπ型分岐接
続体の慨略図を示す。この接続体５は左右が幹線ケーブ
ル（６．６ｋＶ）１，２に接続され、さらに分岐ケーブ
ル３とＰＤアダプタ４が接続される。そして、３相分が
一組になって電柱上に布設される。この図に示すよう
に、一つのπ型分岐接続体には幹線の接続部が二つ、分
岐用の接続部が一つ、トランスに引き出すポールドロッ
プ（ＰＤ）アダプタ用の接続部が一つの計４つの接続部
が存在することになる。As a connecting body, FIG. 4 shows a schematic diagram of a general π-type branch connecting body. The left and right sides of the connection body 5 are connected to the trunk cables (6.6 kV) 1 and 2, and the branch cable 3 and the PD adapter 4 are further connected. Then, the three phases are installed as a set on the utility pole. As shown in this figure, one π-type branch connector has two main line connection parts, one branch connection part, and one connection part for a pole drop (PD) adapter to be drawn to a transformer. There will be four connections.
【０００４】この接続体５の絶縁劣化は、一般的にこれ
らの各接続部において個々に発生すると考えられる。そ
のため、図２に示すように測定用電極６，７，８および
９はそれら接続部５の筐体外周に設置することになり、
３相分で都合１２個必要となる。It is considered that the insulation deterioration of the connecting body 5 generally occurs individually at each of these connecting portions. Therefore, as shown in FIG. 2, the measuring electrodes 6, 7, 8 and 9 are to be installed on the outer circumference of the housing of the connecting portion 5,
For 3 phases, 12 pieces are required.
【０００５】[0005]
【発明が解決しようとする課題】上述した従来方法によ
ると、路上に布設された機器が持つノイズ成分（ケーブ
ル、接地線から入ってくるもの、接続体自身が受けるも
の等）のため、部分放電による信号を正確に判別するこ
とは容易でなく、絶縁劣化の判定が極めて困難であっ
た。また、１度の測定のみではどちらの接続体が劣化し
ているか判別できないことも生じていた。According to the above-mentioned conventional method, the partial discharge is caused by the noise component (equipment coming in from the cable, the grounding wire, the connection body itself, etc.) of the equipment laid on the road. It was not easy to accurately discriminate the signal due to, and it was extremely difficult to determine the insulation deterioration. In addition, it has been impossible to determine which connector is deteriorated by only one measurement.
【０００６】この発明の目的は、上述した従来の技術の
問題点を解消し、部分放電信号を正確に測定し、その結
果より精度の高い絶縁状態の劣化診断を行うことができ
る配電用高圧架空ケーブル分岐接続体の絶縁劣化診断方
法を提供するにある。An object of the present invention is to solve the above-mentioned problems of the prior art, to accurately measure a partial discharge signal, and as a result, to perform a more accurate deterioration diagnosis of an insulation state, which is a high voltage aerial distribution system. It is another object of the present invention to provide a method for diagnosing insulation deterioration of a cable branch connector.
【０００７】[0007]
【課題を解決するための手段】この発明は、配電用高圧
架空ケーブル分岐接続体の絶縁劣化により生じる部分放
電の状態を、部分放電発生部と電極を容量結合させるよ
う配電用高圧架空ケーブル分岐接続体の筐体外側に電極
を設置して、その電極の電位変動信号として検出し、配
電用高圧架空ケーブル分岐接続体の絶縁劣化状態を診断
する方法において、信号に混入しているノイズを信号の
３相間の差分を取ることにより除去し、ノイズの少ない
部分放電信号を得て絶縁劣化の診断を行うことを特徴と
する配電用高圧架空ケーブル分岐接続体の絶縁劣化診断
方法である。また、上記差分を取る信号において、３相
間ではなく配電用高圧架空ケーブル分岐接続体に複数に
設置した電極間および同じ配電線路に設置してある他の
装柱の配電用高圧架空ケーブル分岐接続体間で差分を取
るようにしたことを特徴とする配電用高圧架空ケーブル
分岐接続体の絶縁劣化診断方法である。DISCLOSURE OF THE INVENTION According to the present invention, a distribution high voltage aerial cable branch connection is made so that a partial discharge state caused by insulation deterioration of a distribution high voltage aerial cable branch connector is capacitively coupled to a partial discharge generating portion and an electrode. In the method of installing an electrode on the outside of the body casing and detecting it as a potential fluctuation signal of the electrode, and diagnosing the insulation deterioration state of the distribution high-voltage overhead cable branch connection body, noise mixed in the signal is detected. This is a method for diagnosing insulation deterioration of a distribution high-voltage overhead cable branch connection body, which is characterized in that a difference between three phases is removed to obtain a partial discharge signal with less noise, and insulation deterioration is diagnosed. In addition, in the signal taking the above difference, the distribution high voltage aerial cable branch connection body of the other mounting poles installed between a plurality of electrodes installed in the distribution high voltage aerial cable branch connection body and in the same power distribution line This is a method for diagnosing insulation deterioration of a distribution high-voltage overhead cable branch connection, which is characterized in that a difference is obtained between them.
【０００８】さらに、この発明は、配電用高圧架空ケー
ブル分岐接続体の絶縁劣化により生じる部分放電の状態
を、部分放電発生部と電極を容量結合させるよう配電用
高圧架空ケーブル分岐接続体筐体外側に電極を設置して
その電極の電位変動信号として検出する配電用高圧架空
ケーブル分岐接続体の絶縁劣化状態を診断する方法にお
いて、同じ配電線路内の診断対象接続体に隣接した電柱
に装柱されている配電用高圧架空ケーブル分岐接続体の
信号を診断対象配電用高圧架空ケーブル分岐接続体の信
号から差分することによって、架空ケーブルを伝達し信
号に混入するノイズを除去し、ノイズの少ない部分放電
信号を得るようにして絶縁劣化の診断を行うことを特徴
とする配電用高圧架空ケーブル分岐接続体の絶縁劣化診
断方法である。Further, according to the present invention, the state of partial discharge caused by the insulation deterioration of the distribution high-voltage overhead cable branch connector is provided outside the distribution high-voltage overhead cable branch connector housing so as to capacitively couple the partial discharge generator and the electrode. In the method of diagnosing the insulation deterioration state of the distribution high voltage aerial cable branch connection that detects the potential fluctuation signal of the electrode by installing the electrode on the pole, it is installed on the utility pole adjacent to the connection to be diagnosed in the same distribution line By subtracting the signal of the branch connection of the high-voltage overhead cable for distribution from the signal of the branch connection of the high-voltage overhead cable for distribution, the noise that is transmitted through the overhead cable and mixed into the signal is removed, and the partial discharge with less noise This is a method for diagnosing insulation deterioration of a distribution high-voltage overhead cable branch connection, which is characterized by diagnosing insulation deterioration by obtaining a signal.
【０００９】[0009]
【作用】従来の絶縁劣化診断方法において行われていた
電極一つ一つで検出された信号を分析するのみでなく、
検出された複数の信号の差分を取ることによりケーブル
等から混入するノイズ分を除去した上で分析するため、
ノイズに影響されることなく絶縁劣化の診断を確実に行
うことができる。また、同一配電線路内に設置された診
断対象接続体に、隣接した両側の電柱に装柱される接続
体の信号を診断対象となる接続体信号より差分すること
により、ケーブル等から混入するノイズ分を除去するも
のである。その上で信号を分析するため、ノイズに影響
されずに確実に劣化診断を行うことができ、高い精度で
劣化診断を行うことができる。[Function] In addition to analyzing the signal detected by each electrode, which is performed in the conventional insulation deterioration diagnosing method,
To analyze after removing the noise component mixed from the cable etc. by taking the difference of the detected multiple signals,
The insulation deterioration can be reliably diagnosed without being affected by noise. In addition, by connecting the diagnosis target connector installed in the same distribution line to the signal of the connector installed on the adjacent utility poles from the signal of the connector to be diagnosed, noise mixed in from cables etc. To remove the minute. Since the signal is analyzed after that, deterioration diagnosis can be performed reliably without being affected by noise, and deterioration diagnosis can be performed with high accuracy.
【００１０】[0010]
【実施例】以下、図面に基づいてこの発明の配電用高圧
架空ケーブル分岐接続体の絶縁劣化診断方法の一実施例
を説明する。図１はこの実施例の絶縁劣化診断方法に適
用する測定装置のブロック図で、図２はπ型分岐接続体
に電極を取り付けた状態を示している。図２において、
π型分岐接続体５の４つの接続部には筐体外側にそれぞ
れ信号測定用の電極６，７，８および９が設けられる。
従って、１装柱当たり１２か所に設置されることにな
る。これらの電極６，７，８および９から得られた信号
は、電極を二つ選びそれぞれ差分を取るため信号切替え
器１１に接続される。そして、信号切替え器１１の出力
は同種のノイズ成分を除去するために差分増幅器１２に
入力される。この差分増幅器１２の出力はスペクトルア
ナライザ，オシロスコープ等の信号分析装置１３に入力
し、部分放電信号を検出するようになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for diagnosing insulation deterioration of a distribution high-voltage overhead cable branch connector of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a measuring apparatus applied to the insulation deterioration diagnosing method of this embodiment, and FIG. 2 shows a state in which an electrode is attached to a π-type branch connector. In FIG.
Electrodes 6, 7, 8 and 9 for signal measurement are provided outside the housing at the four connection portions of the π-type branched connection body 5, respectively.
Therefore, it will be installed at 12 places per pole. The signals obtained from these electrodes 6, 7, 8 and 9 are connected to the signal switcher 11 for selecting two electrodes and taking the difference respectively. Then, the output of the signal switcher 11 is input to the differential amplifier 12 in order to remove noise components of the same type. The output of the differential amplifier 12 is input to a signal analyzer 13 such as a spectrum analyzer or oscilloscope to detect a partial discharge signal.
【００１１】接続部内部において絶縁劣化が生じると部
分放電が発生する。その部分放電の発生状態を部分放電
発生部と電極６，７，８および９を容量結合させ、電位
変動分を部分放電信号として検出するのである。勿論、
個々の電極からの信号も同時に測定し、その結果を組み
合わせることによりより測定精度が向上することは明ら
かである。When insulation deterioration occurs inside the connection portion, partial discharge occurs. The state of occurrence of the partial discharge is capacitively coupled to the partial discharge generating portion and the electrodes 6, 7, 8 and 9, and the potential fluctuation is detected as a partial discharge signal. Of course,
It is apparent that the measurement accuracy is further improved by simultaneously measuring the signals from the individual electrodes and combining the results.
【００１２】図３（Ａ）にノイズのない実験室内で接続
体５のＰＤアダプタ接続部４において模擬的に絶縁劣化
を生じさせ、その接続部５上に設置した電極９からの部
分放電信号をスペクトルアナライザ１３で調べた結果を
示す。測定レンジは０〜１０ＭＨｚである。次に、図３
（Ｂ）に実際に電柱上にその模擬劣化させた接続体５を
赤相に装柱し、接続部上の電極７からの部分放電信号を
スペクトルアナライザ１３で先の測定と同周波数領域で
調べた結果を示す。In FIG. 3 (A), the PD adapter connection part 4 of the connection body 5 is simulated to cause insulation deterioration in a noise-free laboratory, and a partial discharge signal from the electrode 9 installed on the connection part 5 is measured. The result investigated by the spectrum analyzer 13 is shown. The measurement range is 0 to 10 MHz. Next, FIG.
In (B), the simulated deteriorated connection body 5 is mounted on the telephone pole in a red phase, and the partial discharge signal from the electrode 7 on the connection portion is examined by the spectrum analyzer 13 in the same frequency range as the previous measurement. The results are shown below.
【００１３】これらの図から、実際の装柱状態において
はノイズが多く、必ずしも部分放電が発生していること
は図３（Ｂ）からだけでは判別することができなかっ
た。From these figures, it was not possible to discriminate from FIG. 3 (B) that a large amount of noise was generated and the partial discharge was necessarily generated in the actual column mounting state.
【００１４】そこで、図１に示す信号検出回路により、
他相のＰＤアダプタ接続部上に設置された電極からの信
号と先の信号とで差分をとり測定した結果を図３（Ｃ）
に示す。この結果は、図３（Ａ）に示す実験室内で測定
した信号と極めて良く一致しており、ノイズ分が消去さ
れたことが分かる。Therefore, by the signal detection circuit shown in FIG.
The difference between the signal from the electrode installed on the PD adapter connection part of the other phase and the previous signal is measured and the result is shown in FIG. 3 (C).
Shown in. This result agrees very well with the signal measured in the laboratory shown in FIG. 3 (A), which shows that the noise component is eliminated.
【００１５】本件発明者の現在までの研究結果によれ
ば、同一装柱内および同一配電線路内の接続体におい
て、検出されるノイズはそのパターンおよび大きさが極
めて類似していることが判明している。従って、電極を
選びその信号の差分を取ればノイズを確実に除去するこ
とができる。According to the results of the research conducted by the present inventor to date, it has been found that the detected noises in the connecting body in the same column and in the same distribution line are very similar in pattern and magnitude. ing. Therefore, noise can be reliably removed by selecting the electrode and taking the difference between the signals.
【００１６】上記の例では、３相間の差分を取る例につ
いて説明したが、他の実施例として３相間でなく接続体
に複数設置した電極間および同じ配電線路内に設置して
ある他の装柱の接続体間で差分を取っても良いことは勿
論である。In the above example, an example in which the difference between the three phases is taken has been described. However, as another embodiment, another device installed between the electrodes provided in the connection body and in the same power distribution line is not used between the three phases. Of course, the difference may be taken between the connected bodies of the pillars.
【００１７】次に、この発明の他の実施例を図５および
図６に基づいて説明する。図５は差分信号測定法の模式
図、図６は信号検出回路のブロック図である。即ち、図
５において、同一配電線路内の隣接して装柱されている
三つの接続体２２，２３および２４を示しており、診断
対象の接続体は真ん中の接続体２２である。測定用電極
１３はここではＰＤアダプタ接続部４に設置してリード
線１４により電位変動信号Ａが信号分析器へ出力するよ
うに接続されている。それぞれ隣接した接続体２３およ
び２４においてもそれぞれのＰＤアダプタ電極９から上
記接続体２２の測定電極１３と同様にそれぞれリード線
１５，１６を介して電位変動信号ＢおよびＣが検出され
信号分析器へ出力される。Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a schematic diagram of a differential signal measuring method, and FIG. 6 is a block diagram of a signal detection circuit. That is, in FIG. 5, three connection bodies 22, 23, and 24 that are mounted adjacent to each other in the same distribution line are shown, and the connection body to be diagnosed is the middle connection body 22. Here, the measuring electrode 13 is installed in the PD adapter connection portion 4 and is connected by the lead wire 14 so that the potential fluctuation signal A is output to the signal analyzer. Also in the adjacent connecting bodies 23 and 24, the potential fluctuation signals B and C are detected from the respective PD adapter electrodes 9 via the lead wires 15 and 16 in the same manner as the measuring electrode 13 of the connecting body 22 and are sent to the signal analyzer. Is output.
【００１８】図６の測定回路において、診断対象の接続
体２２より検出された信号Ａはリード線１４を介して遅
延回路１７を通り増幅器１８により増幅され、差動増幅
器２０に入力される。一方、隣接して装柱されている接
続体２３および２４からの信号Ｂ，Ｃはリード線１５，
１６を介してそれぞれの遅延回路１７を通り加算回路１
９に入力して加算される。そして、この加算回路１９の
出力は差動増幅器２０の−入力端子へ入力され、先の増
幅された信号Ａとこの加算された信号Ｂ，Ｃとの差分を
とる。この差分の信号をスペクトラムアナライザ２１な
どで観察しながら、先の遅延回路１７の遅延時間および
増幅器１８のゲインを調整すれば、配電線路から混入す
るノイズ分を大幅に除去することができる。In the measurement circuit of FIG. 6, the signal A detected by the connection body 22 to be diagnosed is amplified by the amplifier 18 through the lead wire 14 and the delay circuit 17, and is input to the differential amplifier 20. On the other hand, signals B and C from the connecting bodies 23 and 24 which are mounted adjacent to each other are the lead wires 15,
Adder circuit 1 through each delay circuit 17 via 16
Input to 9 and added. The output of the adder circuit 19 is input to the-input terminal of the differential amplifier 20, and the difference between the previously amplified signal A and the added signals B and C is calculated. By adjusting the delay time of the delay circuit 17 and the gain of the amplifier 18 while observing the signal of this difference with the spectrum analyzer 21 or the like, the noise component mixed from the power distribution line can be largely removed.
【００１９】図７（Ａ）に、ノイズのない実験室内で、
接続体の接続部（ＰＤアダプタ接続部）において模擬的
に劣化を生じさせ、その接続部上に設置した電極からの
部分放電信号をスペクトラムアナライザで調べた結果
（０〜１０ＭＨｚ）のパルス波形図を示す。次に、実際
に電柱にその模擬劣化させた絶縁体を装柱（今回は赤
相）し、π型接続部上の電極から検出される部分放電信
号をスペクトラムアナライザにより先の測定と同周波数
領域で調べた結果を図７（Ｂ）に示す。この結果から、
実際の装柱状態においてはノイズ分が多く、必ずしも部
分放電が発生しているとはこの結果からだけでは判別で
きない。In FIG. 7A, in a noise-free laboratory,
A pulse waveform chart of the result (0 to 10 MHz) of the partial discharge signal from the electrode installed on the connection part, which causes a simulated deterioration in the connection part of the connection body (PD adapter connection part), is shown. Show. Next, a simulated deteriorated insulator is installed on a utility pole (red phase in this case), and the partial discharge signal detected from the electrode on the π-type connection part is measured with a spectrum analyzer in the same frequency range as the previous measurement. The result of the examination is shown in FIG. from this result,
There is a lot of noise in the actual mounting state, and it cannot be determined from this result that partial discharge is necessarily occurring.
【００２０】そこで、図６に示す検出回路で同一配電線
路内の診断対象接続体の両側に布設されている接続体の
赤相のＰＤアダプタ接続部上に設置された電極からの信
号を先の信号から差分し測定すると、図７（Ｃ）に示す
ようになった。この結果は、実験室内において測定され
た信号と極めて良く似ており、ノイズ分がほとんど消去
されたことが分かる。従って、ノイズの多い現地装柱状
態においても、同一配電線路内の３装柱分の信号を検出
し、診断対象のπ型接続体の信号から隣接したπ型接続
体の信号を調整して差分することによりノイズ分を消去
することができる。そして、絶縁劣化の度合いを正確に
知ることができるようになる。Therefore, in the detection circuit shown in FIG. 6, the signal from the electrode installed on the red-phase PD adapter connection portion of the connection body laid on both sides of the connection body to be diagnosed in the same distribution line is When the signal was subtracted from the signal and measured, the result was as shown in FIG. 7 (C). This result is very similar to the signal measured in the laboratory, and it can be seen that the noise component is almost eliminated. Therefore, even in a noisy field pole condition, signals for three poles in the same distribution line are detected, and the signal of the adjacent π type connector is adjusted from the signal of the π type connector to be diagnosed to make a difference. By doing so, the noise component can be erased. Then, it becomes possible to accurately know the degree of insulation deterioration.
【００２１】[0021]
【発明の効果】以上説明したとおり、この発明の配電用
高圧架空ケーブル分岐接続体絶縁劣化診断方法によれ
ば、現地において測定される信号からノイズ成分を除去
し、部分放電による信号のみを検出することができる。
その結果、配電用高圧架空ケーブル分岐接続体の絶縁劣
化の診断が容易かつ正確になり、その実用上の価値は極
めて高いものがある。As described above, according to the method for diagnosing insulation deterioration of the high voltage overhead cable for power distribution of the present invention, the noise component is removed from the signal measured at the site and only the signal due to the partial discharge is detected. be able to.
As a result, the insulation deterioration of the distribution high-voltage overhead cable branch connection can be easily and accurately diagnosed, and its practical value is extremely high.
【図１】この発明の一実施例の配電用高圧架空ケーブル
分岐接続体絶縁劣化診断方法に適用する信号検出回路の
ブロック図、FIG. 1 is a block diagram of a signal detection circuit applied to a method of diagnosing insulation deterioration of a high voltage overhead cable for power distribution according to an embodiment of the present invention;
【図２】π型分岐接続体に電極を設けた状態を示す側面
図、FIG. 2 is a side view showing a state in which an electrode is provided on a π-type branch connector,
【図３】（Ａ），（Ｂ），（Ｃ）は、測定結果を示す波
形図で、（Ａ）は模擬劣化させた接続体の実験室内のノ
イズのない状態、（Ｂ）は実際に電柱上の状態、（Ｃ）
は図１の信号検出回路で差分をとり測定した状態、3 (A), (B), and (C) are waveform charts showing the measurement results, (A) is a noise-free state of the simulated deteriorated connection body in the laboratory, and (B) is an actual state. State on utility pole, (C)
Is the state where the difference is measured by the signal detection circuit of FIG. 1,
【図４】従来の一般的なπ型架空接続体の構成を示す側
面図、FIG. 4 is a side view showing the configuration of a conventional general π-type aerial connector,
【図５】この発明の他の実施例の同一配線上で隣接した
３つの電柱に装柱された同相の接続体と信号線を示す側
面図、FIG. 5 is a side view showing a connection body and a signal line of the same phase mounted on three utility poles adjacent to each other on the same wiring according to another embodiment of the present invention;
【図６】図５の信号検出回路のブロック図、6 is a block diagram of the signal detection circuit of FIG. 5,
【図７】（Ａ），（Ｂ），（Ｃ）は、図６に示す回路に
より模擬劣化した接続体を測定した部分放電信号の波形
図で、（Ａ）はノイズの無い室内で測定したもの、
（Ｂ）は実際に電柱上に装柱状態で測定したもの、
（Ｃ）は図６の信号検出回路で差分して測定した波形図
である。7 (A), (B), and (C) are waveform diagrams of partial discharge signals obtained by measuring a connection body simulated and deteriorated by the circuit shown in FIG. 6, and (A) is measured in a noise-free room. thing,
(B) is actually measured on a utility pole in the state of a pole,
FIG. 7C is a waveform diagram obtained by measuring the difference with the signal detection circuit of FIG.
１，２ 幹線ケーブル ３ 分岐ケーブル ４ ＰＤアダプタ ５ π型架空接続体 ６，７，８，９ 信号測定電極 １１ 信号切替え器 １２ 差動増幅器 １３ 信号分析装置 １４，１５，１６ リード線 １７ 遅延回路 １８ 増幅器 １９ 加算器 ２０ 差動増幅器 ２１ 信号分析装置 ２２，２３，２４ π型架空接続体 1, 2 Main line cable 3 Branch cable 4 PD adapter 5 π type overhead connection body 6, 7, 8, 9 Signal measurement electrode 11 Signal switcher 12 Differential amplifier 13 Signal analysis device 14, 15, 16 Lead wire 17 Delay circuit 18 Amplifier 19 Adder 20 Differential amplifier 21 Signal analysis device 22, 23, 24 π type aerial connection
───────────────────────────────────────────────────── フロントページの続き (72)発明者 千綿 直文 茨城県日立市日高町５丁目１番１号「日立 電線株式会社パワーシステム研究所内」 (72)発明者 小谷 一夫 茨城県日立市日高町５丁目１番１号「日立 電線株式会社パワーシステム研究所内」 (72)発明者 杣 謙一郎 茨城県日立市日高町５丁目１番１号「日立 電線株式会社パワーシステム研究所内」 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naofumi Chiwata 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture “Inside the Power System Laboratory, Hitachi Cable, Ltd.” (72) Inventor Kazuo Otani Hidaka, Hitachi City, Ibaraki Prefecture 5-1-1, Machi "Inside Hitachi Power Systems Laboratory" (72) Inventor Kenichiro Soma 5-1-1, Hidaka-cho, Hitachi City, Ibaraki "Inside Hitachi Power Systems Laboratory"
Claims (3)
縁劣化により生じる部分放電の状態を部分放電発生部と
電極を容量結合させるよう配電用高圧架空ケーブル分岐
接続体筐体外側に電極を設置して、その電極の電位変動
信号として検出し、配電用高圧架空ケーブル分岐接続体
の絶縁劣化状態を診断する方法において、信号に混入し
ているノイズを信号の３相間の差分を取ることにより除
去し、ノイズの少ない部分放電信号を得て絶縁劣化の診
断を行うことを特徴とする配電用高圧架空ケーブル分岐
接続体の絶縁劣化診断方法。1. An electrode is installed on the outside of a casing of a distribution high-voltage overhead cable branch connector to capacitively couple the partial discharge generation part and the electrode in a partial discharge state caused by insulation deterioration of the distribution high-voltage overhead cable branch connector. Then, in the method of diagnosing the insulation deterioration state of the distribution high voltage aerial cable branch connection by detecting it as a potential change signal of the electrode, noise mixed in the signal is removed by taking the difference between the three phases of the signal. A method for diagnosing insulation deterioration of a high voltage aerial cable branch connector for distribution, which comprises diagnosing insulation deterioration by obtaining a partial discharge signal with less noise.
はなく配電用高圧架空ケーブル分岐接続体に複数に設置
した電極間および同じ配電線路に設置してある他の装柱
の配電用高圧架空ケーブル分岐接続体間で差分を取るよ
うにしたことを特徴とする配電用高圧架空ケーブル分岐
接続体の絶縁劣化診断方法。2. A high-voltage aerial cable for distribution of other poles installed between a plurality of electrodes installed on a branch connection body of a high-voltage aerial cable for distribution, and on the same power distribution line, instead of between three phases in the signal for taking the difference. A method for diagnosing insulation deterioration of a high voltage aerial cable branch connection body for power distribution, wherein a difference is taken between the branch connection bodies.
縁劣化により生じる部分放電の状態を部分放電発生部と
電極を容量結合させるよう配電用高圧架空ケーブル分岐
接続体筐体外側に電極を設置してその電極の電位変動信
号として検出する配電用高圧架空ケーブル分岐接続体の
絶縁劣化状態を診断する方法において、同じ配電線路内
の診断対象接続体に隣接した電柱に装柱されている配電
用高圧架空ケーブル分岐接続体の信号を診断対象配電用
高圧架空ケーブル分岐接続体の信号から差分することに
よって、架空ケーブルを伝達し信号に混入するノイズを
除去し、ノイズの少ない部分放電信号を得るようにして
絶縁劣化の診断を行うことを特徴とする配電用高圧架空
ケーブル分岐接続体の絶縁劣化診断方法。3. An electrode is installed outside the casing of the distribution high-voltage overhead cable branch connection body so as to capacitively couple the partial discharge generation part and the electrode in a state of partial discharge caused by insulation deterioration of the distribution high-voltage overhead cable branch connection body. In the method of diagnosing the insulation deterioration state of the distribution high voltage overhead cable branch connection, which is detected as a potential fluctuation signal of the electrode, the distribution high voltage installed on the utility pole adjacent to the connection object to be diagnosed in the same distribution line. By subtracting the signal of the overhead cable branch connector from the signal of the diagnostic target high-voltage overhead cable branch connector for distribution, noise that is transmitted through the overhead cable and mixed into the signal is removed, and a partial discharge signal with less noise is obtained. A method for diagnosing insulation deterioration of a high voltage aerial cable branch connector for distribution, which is characterized by performing insulation deterioration diagnosis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5103746A JPH06123756A (en) | 1992-08-31 | 1993-04-07 | Insulation deterioration diagnosis method for high voltage overhead distribution cable |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25344492 | 1992-08-31 | ||
| JP4-253444 | 1992-08-31 | ||
| JP5103746A JPH06123756A (en) | 1992-08-31 | 1993-04-07 | Insulation deterioration diagnosis method for high voltage overhead distribution cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06123756A true JPH06123756A (en) | 1994-05-06 |
Family
ID=26444341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5103746A Pending JPH06123756A (en) | 1992-08-31 | 1993-04-07 | Insulation deterioration diagnosis method for high voltage overhead distribution cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06123756A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009124780A (en) * | 2007-11-12 | 2009-06-04 | Tokyo Electric Power Co Inc:The | Pole-mounted wiring device of high-voltage lowering electric wire |
-
1993
- 1993-04-07 JP JP5103746A patent/JPH06123756A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009124780A (en) * | 2007-11-12 | 2009-06-04 | Tokyo Electric Power Co Inc:The | Pole-mounted wiring device of high-voltage lowering electric wire |
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