JPH03175374A - Locating method for partial discharge position - Google Patents
Locating method for partial discharge positionInfo
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- JPH03175374A JPH03175374A JP31400689A JP31400689A JPH03175374A JP H03175374 A JPH03175374 A JP H03175374A JP 31400689 A JP31400689 A JP 31400689A JP 31400689 A JP31400689 A JP 31400689A JP H03175374 A JPH03175374 A JP H03175374A
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- Prior art keywords
- partial discharge
- intensity
- pulse
- discharge pulse
- detection
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- 238000000034 method Methods 0.000 title claims description 15
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000000691 measurement method Methods 0.000 claims description 3
- 239000011888 foil Substances 0.000 abstract description 11
- 239000002184 metal Substances 0.000 abstract description 11
- 238000001228 spectrum Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 12
- 230000035945 sensitivity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009532 heart rate measurement Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は部分放電位置標定方法、特に長尺型カケープル
線路における部分放電位置の標定方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for locating a partial discharge position, particularly to a method for locating a partial discharge position in a long cable cable line.
長尺型カケープル線路における部分放電位置を標定する
方法としては、従来ＴＤＲ法（ＴｉｍｅＤｏｍａｉｎ
Ｒｅｆｌｅｃｔｏｍｅｔｒｙ ）が知られてし）る。こ
の方法は、長尺ケーブル線路において発生した部分放電
パルスが線路中を往復反射する現象を利用しており、パ
ルス波形の観察により部分放電の位置を標定する方法で
ある。The conventional method for locating partial discharge positions in long cable lines is the TDR method (Time Domain
Reflectometry) is known. This method utilizes the phenomenon in which a partial discharge pulse generated in a long cable line is reflected back and forth in the line, and is a method for locating the position of a partial discharge by observing the pulse waveform.
しかし、この方法は忠実なパルス波形の観察が必要なた
め、低周波方式あるいは広帯域方式による部分放電測定
には適用できるが、同調式による部分放電測定には適用
できない。何故なら、同調式部分放電測定では部分放電
パルスを゛ＬＣ共振回路で共振させるので、パルスの波
形の特徴が失われてしまうからである。ＴＤＲ法ではパ
ルスの波形の特徴が失われると、部分放電の位置を標定
することができない。However, since this method requires faithful observation of pulse waveforms, it can be applied to partial discharge measurements using a low frequency method or a broadband method, but cannot be applied to partial discharge measurements using a tuned method. This is because in the tuned partial discharge measurement, the partial discharge pulse is caused to resonate in the LC resonant circuit, so the characteristics of the pulse waveform are lost. In the TDR method, if the characteristics of the pulse waveform are lost, the position of the partial discharge cannot be located.
部分放電測定においてＳ／Ｎ比を支配するノイズおよび
部分放電パルスの信号検出感度の両者は、電力ケーブル
のり、Ｃ成分による共振、***振、パルスの電力ケーブ
ル線路上での往復反射による定在波等の要因で、複雑な
周波数依存性を有している。従って、比較的高い検出感
度で部分 放電位置の標定を行うには、できるだけ高い
Ｓ／Ｎ比の得られる周波数を選んで用いることができ
る同調式測定法を用いることが望まれる。Both the noise that dominates the S/N ratio in partial discharge measurement and the signal detection sensitivity of partial discharge pulses are affected by power cable tension, resonance and anti-resonance due to the C component, and standing waves due to round-trip reflection of pulses on the power cable line. Due to these factors, it has a complicated frequency dependence. Therefore, in order to locate the partial discharge position with relatively high detection sensitivity, it is desirable to use a tunable measurement method that can select and use a frequency that provides the highest possible S/N ratio.
従って本発明の目的は、同調式部分放電測定が適用でき
、高いＳ／Ｎ比の得られる部分放電位置標定方法を提供
することにある。Therefore, an object of the present invention is to provide a partial discharge position locating method to which tunable partial discharge measurement can be applied and a high S/N ratio can be obtained.
上記目的を達成するために本発明では、電力ケーブル線
路上の少なくとも３つの検出位置（以下、検出点と言う
）で部分放電パルス強度を測定し、線路の長さ方向に沿
って検出位置の間での部分放電パルス強度の増加および
減少の勾配から部分放電パルス強度の極大値が存在する
位置を求め、部分放電の発生区間を標定するようにした
。In order to achieve the above object, the present invention measures the partial discharge pulse intensity at at least three detection positions (hereinafter referred to as detection points) on the power cable line, and measures the partial discharge pulse intensity between the detection positions along the length of the line. The position where the maximum value of the partial discharge pulse intensity exists is determined from the slope of increase and decrease of the partial discharge pulse intensity at , and the area where the partial discharge occurs is located.
さらに、電力ケーブル線路上の各測定位置で部分放電パ
ルス強度の周波数スペクトルを測定して、部分放電の発
生点までの距離を推定することにより、部分放電の発生
位置を確認することができる。Further, by measuring the frequency spectrum of the partial discharge pulse intensity at each measurement position on the power cable line and estimating the distance to the point where the partial discharge occurs, the position where the partial discharge occurs can be confirmed.
二つの検出点の間の区間に部分放電の発生点が含まれな
い場合には、発生点から遠い検出点から近い方の検出点
に向かって検出されるパルス強度が増加する。二つの検
出点の間の区間に部分放電の発生点が含まれる場合には
、検出されるパルス強度の差は極めて小さくなる。それ
故、電力ケーブル線路上の少なくとも３つの検出点で部
分放電パルス強度を測定し、線路の長さ方向に沿って検
出点の各区間での部分放電パルス強度の増加および減少
の勾配から、部分放電パルス強度の極大値が存在する位
置を求めることができる。When a partial discharge generation point is not included in the section between two detection points, the detected pulse intensity increases from a detection point farther from the generation point toward a detection point closer to the generation point. If a partial discharge generation point is included in the area between two detection points, the difference in detected pulse intensity will be extremely small. Therefore, the partial discharge pulse intensity is measured at at least three detection points on the power cable line, and from the slope of the increase and decrease of the partial discharge pulse intensity at each section of the detection points along the length of the line, the partial The position where the maximum value of the discharge pulse intensity exists can be determined.
検出点としては絶縁接続部が有利である。しかし普通接
続部も利用可能であり、またケーブル本体上でもよい。Insulated connections are advantageous as detection points. However, normal connections can also be used, and even on the cable body.
ケーブル本体上で検出する場合には、ケーブルに巻きつ
けたコイル、近接して設けるサーチコイル、金属箔電極
等を用いれば、任意の位置で検出することができる。When detecting on the cable body, it is possible to detect at any position by using a coil wrapped around the cable, a search coil provided nearby, a metal foil electrode, etc.
本発明では部分放電パルス強度はスペクトルアナライザ
により測定されてもよい。これは部分放電パルスは、周
波数の高い成分はど減衰量が大きくなるので、例えば０
．１ＭＨｚ〜１００ＭＨｚの範囲で比較的低い周波数と
比較的高い周波数で減衰量が測定できれば、その差から
部分放電発生位置の推定が可能になる。これを前述の極
大値の検出結果に併せて位置標定すれば、検出精度が更
に向上する。In the present invention, the partial discharge pulse intensity may be measured by a spectrum analyzer. This is because the higher the frequency component of a partial discharge pulse, the greater the attenuation amount, so for example 0
．． If the amount of attenuation can be measured at a relatively low frequency and a relatively high frequency in the range of 1 MHz to 100 MHz, it becomes possible to estimate the partial discharge occurrence position from the difference. If this is combined with the detection result of the local maximum value and the position is determined, the detection accuracy will be further improved.
以下、実施例により本発明をさらに詳細に説明する。Hereinafter, the present invention will be explained in more detail with reference to Examples.
〔実施例１〕
第１図（Ａ）に本発明による部分放電位置標定に用いた
構成を示す。第１図で電力ケーブル１は、普通接続部（
ＮＪＢ）２．絶縁接続部（Ｉ ＪＢ）３１．３２，３３
．３４を有している。ＩＪＢ３１．３２，３３．３４の
各絶縁筒３１ａ。[Example 1] FIG. 1(A) shows a configuration used for partial discharge position location according to the present invention. In Figure 1, the power cable 1 has a normal connection (
NJB)2. Insulated connection part (I JB) 31, 32, 33
．． It has 34. Each insulating cylinder 31a of IJB31.32, 33.34.
３２ａ 、３３ａ、３４ａの両側の防食シースの上に
それぞれ一対の金属箔電極４１．４２，４３゜４４を巻
きつけた。各絶縁接続部の一対の金属箔電極４１，４２
，４３．４４はそれぞれ検出インピーダンス５１，５２
，５３．５４に接続されている。各検出インピーダンス
には、図示されないスペクトルアナライザの機能を有す
るパルス測定装置が接続される。A pair of metal foil electrodes 41, 42, 43° 44 were wound on the anticorrosive sheaths on both sides of 32a, 33a, and 34a, respectively. A pair of metal foil electrodes 41, 42 at each insulated connection part
, 43 and 44 are detection impedances 51 and 52, respectively.
, 53.54. A pulse measurement device (not shown) having a spectrum analyzer function is connected to each detection impedance.
何れかの接続部または中間のケーブル上で部分放電が発
生すると、部分放電パルスは各一対の金属箔電極４１．
４２，４３．４４により検出インピーダンス５１，５２
，５３．５４の両端の電位差として検出される。When a partial discharge occurs on either connection or intermediate cable, a partial discharge pulse is transmitted to each pair of metal foil electrodes 41.
Detected impedance 51, 52 by 42, 43, 44
, 53, and 54.
ＩＪＢ３１．ＩＪＢ３２．ＮＪＢ２．ＩＪＢ３３、ＩＪ
Ｂ３４の間の距離がそれぞれ約６００ｍである。各金属
箔電極に接続した検出インピーダンス５１，５２，５３
．５４には、それぞれ第１表に示す強度の信号が同時に
検出された。信号の検出には、周波数４．８ＭＨｚの同
調式パルス測定装置を用いた。第１表の測定結果を第１
図（Ｂ）
に示す。IJB31. IJB32. NJB2. IJB33, IJ
The distance between each B34 is approximately 600 m. Detection impedances 51, 52, 53 connected to each metal foil electrode
．． 54, signals with the intensities shown in Table 1 were simultaneously detected. A tunable pulse measuring device with a frequency of 4.8 MHz was used to detect the signal. The measurement results in Table 1 are
Shown in Figure (B).
第１表
上記の結果から、４点の測定点Ａ、 Ｂ、 Ｃ，Ｄに基
づいて極大点Ｍを求めることができる。従って、部分放
電はＩＪＢ３２とＩＪＢ３３の間にあるＮＪＢ２または
その付近で発生したものと推定された。第１図（Ｂ）よ
り明らかな通り、極大点Ｍを求めるには、測定点は最少
３点あればよいことがわかる。Table 1 From the above results, the maximum point M can be determined based on the four measurement points A, B, C, and D. Therefore, it was estimated that the partial discharge occurred at or near NJB2, which is between IJB32 and IJB33. As is clear from FIG. 1(B), in order to determine the maximum point M, a minimum of three measurement points are required.
次いで、Ｉ ＪＢ３１およびＩＪＢ３２に取り付けられ
た金属箔電極からの信号について、それぞれパルス測定
装置により周波数スペクトルを求めた。その結果は第２
図に示す通りであった。Next, the frequency spectra of the signals from the metal foil electrodes attached to IJB31 and IJB32 were determined using a pulse measuring device. The result is the second
It was as shown in the figure.
第２図はＩ ＪＢ３１およびＩＪＢ３２の検出部分放電
信号の周波数特性を示す。雨検出点のＩＭＨｚでの信号
強度差Ｖ、とＩＯＭＨｚでの信号強度差ｖＩ０との差Δ
Ｖ （＝Ｖ、。−Ｖ、）と周波数差から、部分放電強度
発生位置を推定することができる。Ｉ ＪＢ３１の検出
結果だけからも可能である。即ち、図示したＩＭＨｚの
信号強度Ｖ、ｌとＩＭＨｚ（７）信号強度ｖ、。’の差
ＡＶ’ （＝Ｖ、。FIG. 2 shows the frequency characteristics of the detected partial discharge signals of IJB31 and IJB32. Difference Δ between the signal strength difference V at IMHz and the signal strength difference vI0 at IOMHz at the rain detection point
The position where partial discharge intensity occurs can be estimated from V (=V, .-V,) and the frequency difference. It is possible to do this only from the detection results of IJB31. That is, the illustrated IMHz signal strength V,l and the IMHz(7) signal strength v,. 'difference AV' (=V,.
ｖ＋’）から、部分放電強度発生位置を推定することも
できる。第１図（Ｂ）の標定結果にこの推定を組み合わ
せると、標定精度はさらに向上する。v+'), it is also possible to estimate the position where the partial discharge intensity occurs. When this estimation is combined with the orientation result shown in FIG. 1(B), the orientation accuracy is further improved.
〔実施例２〕
第３図（Ａ）に本発明による部分放電位置標定に用いた
別の構成を示す。第３図で電力ケーブルｌはＮＪＢ２２
，２３．ＩＪＢ３５，３６，３７゜３８を有している。[Example 2] FIG. 3(A) shows another configuration used for partial discharge position location according to the present invention. In Figure 3, power cable l is NJB22
, 23. It has IJB 35, 36, 37°38.
ＮＪＢ２２はＩＪＢ３５と３６の間に、ＮＪＢ２３はＩ
ＪＢ３７”と３８の間にそれぞれ位置する。ＩＪＢ３５
，３６，３７゜３８の各絶縁筒３５ａ、３６ａ、３７ａ
、３８ａの両側の防食シースの上にそれぞれ一対の金属
箔電極４５，４６，４７．４８を巻きつけた。各絶縁接
続部の一対の金属箔電極４５，４６．４７゜４８は、そ
れぞれ検出インピーダンス５５，５６゜５７．５８に接
続されている。各検出インピーダンスには、図示されな
いパルス測定装置を接続した。NJB22 is between IJB35 and 36, NJB23 is between IJB35 and 36, and NJB23 is between IJB35 and 36.
Located between JB37” and 38.IJB35
, 36, 37° 38 insulating cylinders 35a, 36a, 37a
, 38a, a pair of metal foil electrodes 45, 46, 47 and 48 were respectively wound on the anti-corrosion sheath on both sides of the electrodes. A pair of metal foil electrodes 45, 46.47° 48 of each insulated connection part are connected to detection impedances 55, 56° 57.58, respectively. A pulse measuring device (not shown) was connected to each detection impedance.
何れかの接続部または中間のケーブル上で部分放電が発
生すると、実施例１と同様に、部分放電パルスは各一対
の金属箔電極４５，４６，４７゜４８により検出インピ
ーダンス５５，５６，５７゜５８の両端の電位差として
検出される。When a partial discharge occurs on any connection or intermediate cable, the partial discharge pulse is detected by each pair of metal foil electrodes 45, 46, 47 degrees 48 at impedances 55, 56, 57 degrees, as in the first embodiment. It is detected as a potential difference between both ends of 58.
ＩＪＢ３５．ＮＪＢ２２．ＩＪＢ３６．ＩＪＢ３７、Ｎ
ＪＢ２３．ＩＪＢ３８の間の距離がそれぞれ約６００ｍ
である０周波数４．８ＭＨ２の同調式パルス測定装置を
用いて部分放電パルスを測定した。各絶縁接続部に設け
られた検出インピーダンス５５，５６．５７．５８には
、それぞれ第２表に示す強度の信号が同時に検出された
。第２表の測定結果を第３図（Ｂ）に示す。IJB35. NJB22. IJB36. IJB37,N
JB23. The distance between IJB38 is approximately 600m each.
Partial discharge pulses were measured using a tunable pulse measuring device with a zero frequency of 4.8 MH2. Signals with the intensities shown in Table 2 were simultaneously detected at the detection impedances 55, 56, 57, and 58 provided at each insulated connection. The measurement results in Table 2 are shown in FIG. 3(B).
第２表
上記の結果から極大点が求められ、部分放電はＩＪＢ３
７とＩＪＢ３８の間にあるＮＪＢ２３またはその付近で
発生したものと推定された。Table 2 From the above results, the maximum point is found, and the partial discharge is IJB3
It is estimated that the incident occurred at or near NJB 23, which is between NJB 7 and IJB 38.
本発明によると、周波数の選択により高いＳ／Ｎ比が得
られる同調式部分放電測定法を用いて、部分放電位置を
標定することができる。結果として高い検出感度で部分
放電の位置標定を行うことができ、比較的小さい部分放
電、あるいは測定点から遠い場所で発生した部分放電で
も、発生位置の標定ができる。According to the present invention, a partial discharge position can be located using a tunable partial discharge measurement method that can obtain a high S/N ratio by selecting a frequency. As a result, the position of partial discharge can be located with high detection sensitivity, and even if the partial discharge is relatively small or occurs far from the measurement point, the position of occurrence can be located.
第１図（Ａ）は本発明の一実施例の概要を示す説明図、
第１図（Ｂ）は実施例１において各絶縁接続部の検出イ
ンピーダンスで検出された信号の強度を示すグラフ、第
２図は本発明による一測定例で得られた周波数スペクト
ルのグラフ、第３図（Ａ）は本発明の他の実施例の概要
を示す説明図、第３図（Ｂ）は実施例２において各絶縁
接続部の検出インピーダンスで検出された信号の強度を
示すグラフである。
符号の説明
１−・・−・−・−・−・・−−−一−−−−−−−−
・−−−−−−−一電力ケーブル２．２２．２３−−・
−・−・−−−−−一−−−〜普通接続部（ＮＪＢ）３
１．３２．３３．３４゜
３５、 ３６． ３７． ３８−・−・絶縁接続部（Ｉ
ＪＢ）３１ａ、３２ａ、３３ａ、３４ａ。
３５ａ、３６ａ、３７ａ、３８ａ・・−・−・・絶縁筒
４１．４２，４３，４４゜
４５．４６，４７．４８・・−・−・・金属箔電極５１
．５２．５３，５４゜
５５．５５，５７．５８−・−・・・−・−・−検出イ
ンピー第２図FIG. 1(A) is an explanatory diagram showing an outline of an embodiment of the present invention;
FIG. 1(B) is a graph showing the intensity of the signal detected by the detection impedance of each insulated connection in Example 1, FIG. 2 is a graph of the frequency spectrum obtained in one measurement example according to the present invention, and FIG. FIG. 3(A) is an explanatory diagram showing an outline of another embodiment of the present invention, and FIG. 3(B) is a graph showing the intensity of the signal detected by the detection impedance of each insulated connection portion in the second embodiment. Explanation of symbols 1-・・−・−・−・−・・−−−1−−−−−−−
・-----Power cable 2.22.23--・
−・−・−−−−−1−−−−Normal connection part (NJB) 3
1.32.33.34°35, 36. 37. 38---Insulated connection part (I
JB) 31a, 32a, 33a, 34a. 35a, 36a, 37a, 38a... Insulating cylinder 41.42, 43, 44° 45.46, 47.48... Metal foil electrode 51
．． 52.53, 54゜55.55, 57.58-・-・・・・−・Detection impy Fig. 2
Claims (3)
で部分放電パルス強度を測定し、線路の長さ方向に沿っ
て検出位置の間での部分放電パルス強度の増加または減
少の勾配から部分放電パルス強度の極大値が存在する位
置を求め、この位置を部分放電の発生位置として標定す
ることを特徴とする部分放電位置標定方法。(1) Measure the partial discharge pulse intensity at at least three detection positions on the power cable line, and calculate the partial discharge pulse intensity from the gradient of increase or decrease in the partial discharge pulse intensity between the detection positions along the length of the line. A partial discharge position locating method characterized by determining a position where a maximum value of intensity exists and locating this position as a partial discharge occurrence position.
求項第１項の部分放電位置標定方法。(2) The partial discharge position locating method according to claim 1, wherein the partial discharge pulse intensity is measured by a tunable measurement method.
、前記測定値が周波数の増大に対応して伝播減衰量が大
になることを考慮して放電位置を標定する請求項第１項
の部分放電位置標定方法。(3) The measured value of the partial discharge pulse intensity is subjected to frequency analysis, and the discharge position is determined by taking into account that the measured value increases the propagation attenuation as the frequency increases. Partial discharge position locating method.
Priority Applications (22)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1314006A JPH0833429B2 (en) | 1989-12-02 | 1989-12-02 | Local discharge location method for long power cable lines |
| NO900431A NO302494B1 (en) | 1989-10-25 | 1990-01-30 | A method for detecting a partial discharge in an electrical power cable insulation |
| CA002008898A CA2008898C (en) | 1989-10-25 | 1990-01-30 | Method for detecting partial discharge in an insulation of an electric power apparatus |
| DE69033263T DE69033263T2 (en) | 1989-10-25 | 1990-01-31 | Method for comparing frequency spectra |
| EP94111230A EP0629866B1 (en) | 1989-10-25 | 1990-01-31 | Method for locating faults in an electric power cable line |
| DE69033279T DE69033279T2 (en) | 1989-10-25 | 1990-01-31 | Method for measuring partial discharges in a wire with a detection electrode |
| DE69026186T DE69026186T2 (en) | 1989-10-25 | 1990-01-31 | Method for determining partial discharges in the insulation of an electrical power cable |
| EP97111457A EP0806676B1 (en) | 1989-10-25 | 1990-01-31 | Use of detecting electrode to measure partial discharge in a wire |
| DE69032763T DE69032763T2 (en) | 1989-10-25 | 1990-01-31 | Use of a magnetic core for measuring partial discharges |
| DE69032808T DE69032808T2 (en) | 1989-10-25 | 1990-01-31 | Procedure for locating faults in electrical power cables |
| EP97111472A EP0806677A1 (en) | 1989-10-25 | 1990-01-31 | Method for detecting partial discharge |
| EP03000561A EP1310803A3 (en) | 1989-10-25 | 1990-01-31 | Method for detecting partial discharge |
| EP94111232A EP0628829B1 (en) | 1989-10-25 | 1990-01-31 | Use of magnetic core to measure partial discharge |
| EP94111231A EP0636890B1 (en) | 1989-10-25 | 1990-01-31 | Method for comparing frequency spectrums |
| EP90101895A EP0424598B1 (en) | 1989-10-25 | 1990-01-31 | Method for detecting partial discharge in an insulation of an electric power cable |
| US07/784,728 US5323117A (en) | 1989-10-25 | 1991-10-28 | Method for detecting partial discharge in an insulation of an electric power apparatus |
| US08/163,572 US5469067A (en) | 1989-10-25 | 1993-12-08 | Detecting partial discharge using a detection coil and analysis of output signal and noise frequency spectrums |
| NO963529A NO304761B1 (en) | 1989-10-25 | 1996-08-23 | A method of detecting partial discharge in an insulation of an electr |
| NO963530A NO304126B1 (en) | 1989-10-25 | 1996-08-23 | A method for detecting partial discharge in an insulation for electrical devices |
| NO963528A NO301673B1 (en) | 1989-10-25 | 1996-08-23 | Method for detecting partial discharge in an insulation of an electrical device |
| NO963527A NO303304B1 (en) | 1989-10-25 | 1996-08-23 | A method of detecting a partial discharge in an insulation of an electric power cable or similar |
| NO974684A NO309881B1 (en) | 1989-10-25 | 1997-10-10 | Method for Detecting Partial Discharge in Power Cables Coupled by Insulation Joints |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1314006A JPH0833429B2 (en) | 1989-12-02 | 1989-12-02 | Local discharge location method for long power cable lines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03175374A true JPH03175374A (en) | 1991-07-30 |
| JPH0833429B2 JPH0833429B2 (en) | 1996-03-29 |
Family
ID=18048080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1314006A Expired - Lifetime JPH0833429B2 (en) | 1989-10-25 | 1989-12-02 | Local discharge location method for long power cable lines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0833429B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004354248A (en) * | 2003-05-29 | 2004-12-16 | Asahi Electric Works Ltd | Conductive line determination method and measuring device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0315771A (en) * | 1989-06-14 | 1991-01-24 | Hitachi Ltd | Method and device for locating abnormality of gas insulation electric apparatus |
-
1989
- 1989-12-02 JP JP1314006A patent/JPH0833429B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0315771A (en) * | 1989-06-14 | 1991-01-24 | Hitachi Ltd | Method and device for locating abnormality of gas insulation electric apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004354248A (en) * | 2003-05-29 | 2004-12-16 | Asahi Electric Works Ltd | Conductive line determination method and measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0833429B2 (en) | 1996-03-29 |
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