JPH0666876A - Method for judging partial discharge - Google Patents

Method for judging partial discharge

Info

Publication number
JPH0666876A
JPH0666876A JP24412192A JP24412192A JPH0666876A JP H0666876 A JPH0666876 A JP H0666876A JP 24412192 A JP24412192 A JP 24412192A JP 24412192 A JP24412192 A JP 24412192A JP H0666876 A JPH0666876 A JP H0666876A
Authority
JP
Japan
Prior art keywords
power cable
discharge
partial discharge
spectrum analyzer
cable
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.)
Granted
Application number
JP24412192A
Other languages
Japanese (ja)
Other versions
JP3151754B2 (en
Inventor
Yoshio Tsunoda
美伯 角田
Akio Miura
昭夫 三浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Cable Industries Ltd
Original Assignee
Mitsubishi Cable Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Cable Industries Ltd filed Critical Mitsubishi Cable Industries Ltd
Priority to JP24412192A priority Critical patent/JP3151754B2/en
Publication of JPH0666876A publication Critical patent/JPH0666876A/en
Application granted granted Critical
Publication of JP3151754B2 publication Critical patent/JP3151754B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To estimate the presence of a partial discharge of a power cable and its position. CONSTITUTION:A transformer 2 is connected to the close end Ca of a power cable C through a blocking coil 1. A spectrum analyzer 4 is connected to the close end Ca through a capacitor 3 to connect the output of the spectrum analyzer 4 to an outputter 5. When a voltage is applied to the power cable 1 from the transformer 2 at measurement, the discharge signal of a partial discharge, if present, is inputted to the spectrum analyzer 4 through the capacitor 3 and thereafter displayed on the outputter 5, so that the discharge can be estimated from a higher harmonic power spectrum.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、電力ケーブル中の部分
放電の存在を判定する部分放電判定方法に関するもので
ある。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partial discharge judging method for judging the presence of partial discharge in a power cable.

【0002】[0002]

【従来の技術】従来から、部分放電測定には広帯域法、
同調法、低周波等種々の方法が知られている。
2. Description of the Related Art Conventionally, a wide band method has been used for measuring partial discharge,
Various methods such as a tuning method and a low frequency method are known.

【0003】[0003]

【発明が解決しようとする課題】しかし、簡便に部分放
電の有無、或いはその発生位置を知ることはなかなか困
難である。
However, it is difficult to easily know the presence or absence of partial discharge or the position of occurrence of partial discharge.

【0004】本発明の目的は、簡便に部分放電の有無及
びその発生位置を知ることができる部分放電判定方法を
提供することにある。
An object of the present invention is to provide a partial discharge determination method capable of easily knowing the presence or absence of partial discharge and the position of occurrence thereof.

【0005】[0005]

【課題を解決するための手段】上述の目的を達成するた
めの本発明に係る部分放電判定方法は、電力ケーブルに
スペクトラムアナライザを接続し、電力ケーブルの絶縁
体中の信号の周波数に応じたパワースペクトルを測定
し、高調波成分にピークが現れると電力ケーブル中で放
電があると判定し、これらの高調波成分が単調に分布し
ている場合は電力ケーブルの近端又は遠端で放電が発生
しており、高調波成分の分布が中間に凹みがある場合は
電力ケーブルの中間部に放電が発生していると判定す
る。
A method for determining partial discharge according to the present invention for achieving the above-mentioned object is to connect a spectrum analyzer to a power cable and set a power corresponding to a frequency of a signal in an insulator of the power cable. When the spectrum is measured and peaks appear in the harmonic components, it is determined that there is discharge in the power cable.If these harmonic components are monotonically distributed, discharge occurs at the near end or far end of the power cable. If the distribution of the harmonic components has a dent in the middle, it is determined that discharge has occurred in the middle part of the power cable.

【0006】[0006]

【作用】上述の構成を有する部分放電判定方法は、スペ
クトラムアナライザによる高調波成分の分布を基に放電
の有無、その位置を判断する。
According to the partial discharge determination method having the above-described configuration, the presence or absence of discharge and the position thereof are determined based on the distribution of the harmonic component by the spectrum analyzer.

【0007】[0007]

【実施例】図1は電力ケーブルCに対して、本発明の方
法を適用するための構成図である。電力ケーブルCの近
端Caにはブロッキングコイル1を介してトランス2を接
続する。更に、近端Caにはコンデンサ3を介してスペク
トラムアナライザ4を接続し、スペクトラムアナライザ
4の出力をオッシロスコープやペンレコーダ等の出力器
5に接続する。なお、6は較正用としてケーブルCの遠
端Cbに接続したパルスジェネレータである。
1 is a block diagram for applying the method of the present invention to a power cable C. In FIG. The transformer 2 is connected to the near end Ca of the power cable C via the blocking coil 1. Further, a spectrum analyzer 4 is connected to the near end Ca via a capacitor 3, and the output of the spectrum analyzer 4 is connected to an output device 5 such as an oscilloscope or a pen recorder. Reference numeral 6 is a pulse generator connected to the far end Cb of the cable C for calibration.

【0008】測定に当って、トランス2から電力ケーブ
ルCに電圧を印加すると、部分放電があれば、その放電
信号は電力ケーブルC内を進行して反射を繰り返すの
で、コンデンサ3を介してスペクトラムアナライザ4で
測定し、その特性を出力器5に表示する。
When voltage is applied from the transformer 2 to the power cable C in the measurement, if there is partial discharge, the discharge signal travels in the power cable C and repeats reflection, so that the spectrum analyzer via the capacitor 3 is used. 4 and the characteristics are displayed on the output device 5.

【0009】図2〜図4は長さ700m供試ケーブルを
用いて、それぞれ近端Ca、近端Caから110mの位置、
及び遠端Cbから、パルスジェネレータ6により部分放電
と見做し得る電荷を注入した場合に、近端Caにおいてス
ペクトラムアナライザ4を介して出力器5で得られた、
横軸を周波数、縦軸を電圧としたパワースペクトルのグ
ラフ図である。
2 to 4 show a near-end Ca and a position 110 m from the near-end Ca, respectively, using a test cable of 700 m in length.
And when a charge that can be regarded as a partial discharge is injected by the pulse generator 6 from the far end Cb, it is obtained at the output device 5 via the spectrum analyzer 4 at the near end Ca,
FIG. 7 is a graph of a power spectrum with the horizontal axis representing frequency and the vertical axis representing voltage.

【0010】700mの供試ケーブルの場合に、反射パ
ルスのスペクトル中の基本周波数fはf=v/λ=20
0/(2×700)=0.14から140kHzとな
る。図2〜図4におけるピークは、基本周波数140k
Hzを基にした高調波である。
For a 700 m test cable, the fundamental frequency f in the spectrum of the reflected pulse is f = v / λ = 20.
0 / (2 × 700) = 0.14 to 140 kHz. The peak in FIGS. 2 to 4 has a fundamental frequency of 140 k.
It is a harmonic based on Hz.

【0011】部分放電が近端Ca又は遠端Cbで生じた場合
には、図2、図4に示すように高調波は単調な分布とな
る。つまり、ケーブル内のパルスはを全長を往復するだ
けのものであり、低次から高次まで単調に変化すること
になる。
When the partial discharge occurs at the near end Ca or the far end Cb, the harmonics have a monotonous distribution as shown in FIGS. In other words, the pulse in the cable only travels back and forth over the entire length and changes monotonically from low order to high order.

【0012】また、供試ケーブル中間部において部分放
電が発生した場合には、反射波の打ち消しが生じ、図3
に示すように高調波分布に乱れが生ずる。なお、正しく
中間部Cmに発生した場合には、この基本周波数における
ピークは他の場合の倍の大きさとなる。
Further, when partial discharge occurs in the middle portion of the test cable, the reflected wave is canceled out, as shown in FIG.
As shown in, the harmonic distribution is disturbed. In addition, when it occurs correctly in the intermediate portion Cm, the peak at this fundamental frequency becomes twice as large as in other cases.

【0013】また、ケーブル中に混入する雑音は、放電
による高調波の特徴的な信号によって、放電とは十分に
区別し得ることになる。
Further, the noise mixed in the cable can be sufficiently distinguished from the discharge by the characteristic signal of the harmonics generated by the discharge.

【0014】なお、実施例においてはケーブルCの端末
で測定する例を示したが、図5に示すように中間接続部
の遮蔽部分において検出することも可能であり、この場
合に遮蔽の間に箔電極7a、7bを介して挿入したイン
ピーダンスZによりケーブルCは左右にパルス的に二分
され、2本のケーブルCa、Cbのそれぞれについて見掛け
上、図1のケーブル端での検出と同等の動作が得られ
る。
In the embodiment, an example of measuring at the end of the cable C is shown, but it is also possible to detect at the shielded portion of the intermediate connecting portion as shown in FIG. The cable C is pulse-divided into right and left by the impedance Z inserted through the foil electrodes 7a and 7b, and apparently the two cables Ca and Cb have the same operation as the detection at the cable end in FIG. can get.

【0015】[0015]

【発明の効果】以上説明したように本発明に係る部分放
電判定方法は、電力ケーブルに接続したスペクトラムア
ナライザの出力波形を観察することにより、放電の有無
及びその位置を推測することが可能となる。
As described above, the partial discharge determination method according to the present invention makes it possible to estimate the presence or absence of discharge and its position by observing the output waveform of the spectrum analyzer connected to the power cable. .

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

【図1】本発明に係る方法を実施するための構成図であ
る。
1 is a block diagram for implementing the method according to the present invention.

【図2】出力パワースペクトルを表すグラフ図である。FIG. 2 is a graph showing an output power spectrum.

【図3】出力パワースペクトルを表すグラフ図である。FIG. 3 is a graph showing an output power spectrum.

【図4】出力パワースペクトルを表すグラフ図である。FIG. 4 is a graph showing an output power spectrum.

【図5】本発明に係る方法を実施するための変形例の構
成図である。
FIG. 5 is a block diagram of a modification for carrying out the method according to the present invention.

【符号の説明】[Explanation of symbols]

C、Ca、Cb 電力ケーブル 1 ブロッキングコイル 2 トランス 3 コンデンサ 4 スペクトラムアナライザ 5 出力器 6 パルスジェネレータ 7a、7b 箔電極 C, Ca, Cb Power cable 1 Blocking coil 2 Transformer 3 Capacitor 4 Spectrum analyzer 5 Output device 6 Pulse generator 7a, 7b Foil electrode

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 電力ケーブルにスペクトラムアナライザ
を接続し、電力ケーブルの絶縁体中の信号の周波数に応
じたパワースペクトルを測定し、高調波成分にピークが
現れると電力ケーブル中で放電があると判定し、これら
の高調波成分が単調に分布している場合は電力ケーブル
の近端又は遠端で放電が発生しており、高調波成分の分
布が中間に凹みがある場合は電力ケーブルの中間部に放
電が発生していると判定することを特徴とする部分放電
判定方法。
1. A spectrum analyzer is connected to a power cable, a power spectrum corresponding to a frequency of a signal in an insulator of the power cable is measured, and when a peak appears in a harmonic component, it is determined that there is a discharge in the power cable. However, when these harmonic components are monotonically distributed, discharge is occurring at the near end or far end of the power cable, and when the harmonic component distribution has a dent in the middle, the middle part of the power cable is A method of determining partial discharge, characterized in that it is determined that a discharge has occurred in the.
JP24412192A 1992-08-20 1992-08-20 Partial discharge judgment method Expired - Fee Related JP3151754B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24412192A JP3151754B2 (en) 1992-08-20 1992-08-20 Partial discharge judgment method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24412192A JP3151754B2 (en) 1992-08-20 1992-08-20 Partial discharge judgment method

Publications (2)

Publication Number Publication Date
JPH0666876A true JPH0666876A (en) 1994-03-11
JP3151754B2 JP3151754B2 (en) 2001-04-03

Family

ID=17114075

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24412192A Expired - Fee Related JP3151754B2 (en) 1992-08-20 1992-08-20 Partial discharge judgment method

Country Status (1)

Country Link
JP (1) JP3151754B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8009327B2 (en) 2002-07-11 2011-08-30 Canon Kabushiki Kaisha Method and apparatus for image processing
US10898913B2 (en) 2013-12-19 2021-01-26 Oerlikon Metco (Us) Inc. Long-life plasma nozzle with liner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8009327B2 (en) 2002-07-11 2011-08-30 Canon Kabushiki Kaisha Method and apparatus for image processing
US10898913B2 (en) 2013-12-19 2021-01-26 Oerlikon Metco (Us) Inc. Long-life plasma nozzle with liner

Also Published As

Publication number Publication date
JP3151754B2 (en) 2001-04-03

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