JPH026760A - Detecting method for abnormal point of power cable - Google Patents
Detecting method for abnormal point of power cableInfo
- Publication number
- JPH026760A JPH026760A JP15386688A JP15386688A JPH026760A JP H026760 A JPH026760 A JP H026760A JP 15386688 A JP15386688 A JP 15386688A JP 15386688 A JP15386688 A JP 15386688A JP H026760 A JPH026760 A JP H026760A
- Authority
- JP
- Japan
- Prior art keywords
- squid
- cable
- magnetic flux
- detecting
- detecting coil
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 7
- 230000002159 abnormal effect Effects 0.000 title claims description 3
- 239000011800 void material Substances 0.000 claims abstract description 13
- 230000004907 flux Effects 0.000 claims abstract description 9
- 241000238366 Cephalopoda Species 0.000 claims abstract description 7
- 239000012212 insulator Substances 0.000 claims abstract description 5
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 239000004020 conductor Substances 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Testing Relating To Insulation (AREA)
- Measuring Magnetic Variables (AREA)
- Locating Faults (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野］
この発明は、電力ケーブル（接続部も含む）の絶縁体中
のボイド放電を検出する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a method for detecting void discharges in the insulation of power cables (including connections).
［従来の技術］
ボイド放電の検出方法としては、■放電パルスを検出す
る方法、■放電に伴なう超音波をＡＥセンサを用いて検
出する方法（昭和６３年電気学会全国大会論文集、 １
３３９参照）などが知られている。[Prior art] Methods for detecting void discharge include: ■Method of detecting discharge pulses; ■Method of detecting ultrasonic waves accompanying discharge using an AE sensor (Proceedings of the 1986 National Conference of the Institute of Electrical Engineers of Japan, 1)
339) are known.
［発明が解決しようとする課題］
７しかし、これらの方法で検出できる下限は１０〜＋０
０ ｐｃ程度のボイド放電までであり、現場測定ではノ
イズの影響により感度はさらに低下する。[Problem to be solved by the invention] 7 However, the lower limit that can be detected by these methods is 10 to +0
This is up to a void discharge of about 0 pc, and in field measurements, the sensitivity is further reduced due to the influence of noise.
ボイド放電から事故にいたる場合、初期の放電は５ｐＣ
以下といわれている。このような微弱な放電は、現状で
は測定が不可能である。When a void discharge leads to an accident, the initial discharge is 5pC.
It is said that the following. Such weak discharges are currently impossible to measure.
したがって、検出できなかった小さいボイド放電が原因
になって、後で大停電につながる地絡事故が発生する可
能性がある。Therefore, a small void discharge that cannot be detected may later cause a ground fault that can lead to a major power outage.
［発明の目的］
従来検出できなかった微小なボイド放電まで検出して、
経済的・社会的に大きな影響を及ぼしかねない大ｌ（故
の発生を未然に防止する。[Purpose of the invention] Detects even minute void discharges that could not be detected conventionally,
Prevent the occurrence of large-scale accidents that could have a major economic and social impact.
［課題を解決するための手段コ
第１ａ−第２図のように、
ケーブル１２またはケーブル接続部の絶縁体中のボイド
放電に伴なう磁束の変化を、ＳＱＵＩＤセンサ１４を用
いて検出する。[Means for Solving the Problems] As shown in FIGS. 1a to 2, changes in magnetic flux due to void discharge in the insulator of the cable 12 or the cable connection part are detected using the SQUID sensor 14.
［その説明］ ・丈例植戚： 第１ａ、第１ｂ図において、 １２はケーブル（ケーブル接続部も含む）である。[Explanation] ・Jōrei Sekiki: In Figures 1a and 1b, 12 is a cable (including a cable connection part).
１４はＳＱＵＩＤセンサの全体を示し、ＳＱＵＩＤ１６
（ＤＣまたはＲＦ）、検出コイル１８、コントローラ２
２（ロックインアンプ、発振器バイアス電流源など）な
どからなる。 ＳＱＵＩＤセンサは、ジョセフソン接合
を用いた公知の高感度磁束計で、生体磁界の計測などに
用いられている。14 shows the entire SQUID sensor, SQUID16
(DC or RF), detection coil 18, controller 2
2 (lock-in amplifier, oscillator bias current source, etc.). A SQUID sensor is a well-known high-sensitivity magnetometer using a Josephson junction, and is used for measuring biomagnetic fields.
なお、検出コイル１８は、ケーブル１２をとりまき、投
手力向に、ＳＱＵＩＤ１６ととも移動できるように（ま
たはケーブル１２の方が移動できるように）設けられる
。The detection coil 18 surrounds the cable 12 and is provided so that it can move together with the SQUID 16 (or so that the cable 12 can move) in the direction of the pitcher's force.
２４はコンピュータである。24 is a computer.
２６は磁気シールドで、検出コイル１８．ＳＱＵＩＤ１
６およびそれらの間の導線２０の上を覆い、外部の磁束
を遮蔽する。磁気シールド２６の長さは検出コイル１８
より長めにする。またその開口部２８を絞って磁束の侵
入を防ぐ。26 is a magnetic shield, and a detection coil 18. SQUID1
6 and the conducting wire 20 between them to shield external magnetic flux. The length of the magnetic shield 26 is the detection coil 18
Make it longer. Further, the opening 28 is narrowed to prevent magnetic flux from entering.
磁気シールド２６は検出コイル１８と非磁性体ケーブル
１２の絶縁体中のボイド放電に伴なう磁束の変化を、Ｓ
ＱＵＩＤセンサ１４により検出するので、
従来の場合より高感度のボイド放電検出が可能になり、
たとえば枠試験時に、将来の地絡事故につながる恐れの
ある異常点を検出できる。The magnetic shield 26 suppresses changes in magnetic flux due to void discharge in the insulators of the detection coil 18 and the non-magnetic cable 12 by S
Since it is detected by the QUID sensor 14, it is possible to detect void discharge with higher sensitivity than in the conventional case.
For example, during frame testing, abnormal points that may lead to future ground faults can be detected.
第１ａ図は本発明の詳細な説明図、
第１ｂ図は第１ａ図を上方から見た状態の一部省略した
説明図、
第２図は本発明の別の実施例の説明図。
１２：ケーブル
１６：ＳＱＵＩＤ
２０：導線
２４：コンピュータ
２８：開口部FIG. 1a is a detailed explanatory diagram of the present invention, FIG. 1b is an explanatory diagram of FIG. 1a viewed from above with some parts omitted, and FIG. 2 is an explanatory diagram of another embodiment of the present invention. 12: Cable 16: SQUID 20: Conductor 24: Computer 28: Opening
Claims (1)
に伴なう磁束の変化を、ＳＱＵＩＤセンサにより検出す
る、電力ケーブルの異常点検出方法。A method for detecting an abnormal point in a power cable, which uses a SQUID sensor to detect changes in magnetic flux due to void discharge in an insulator of a cable or a cable connection part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15386688A JPH026760A (en) | 1988-06-22 | 1988-06-22 | Detecting method for abnormal point of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15386688A JPH026760A (en) | 1988-06-22 | 1988-06-22 | Detecting method for abnormal point of power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH026760A true JPH026760A (en) | 1990-01-10 |
Family
ID=15571816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15386688A Pending JPH026760A (en) | 1988-06-22 | 1988-06-22 | Detecting method for abnormal point of power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH026760A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4945786A (en) * | 1986-02-14 | 1990-08-07 | Toyoda Gosei Co., Ltd. | Steering wheel |
| JPH0777516A (en) * | 1993-07-12 | 1995-03-20 | Sumitomo Electric Ind Ltd | Nondestructive inspection equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS542126B1 (en) * | 1969-11-07 | 1979-02-02 | ||
| JPS6010184A (en) * | 1983-06-29 | 1985-01-19 | Mitsubishi Electric Corp | Insulation diagnosing apparatus for solid insulator in electric appliance |
| JPS6327880B2 (en) * | 1982-08-03 | 1988-06-06 | Sumitomo Bakelite Co |
-
1988
- 1988-06-22 JP JP15386688A patent/JPH026760A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS542126B1 (en) * | 1969-11-07 | 1979-02-02 | ||
| JPS6327880B2 (en) * | 1982-08-03 | 1988-06-06 | Sumitomo Bakelite Co | |
| JPS6010184A (en) * | 1983-06-29 | 1985-01-19 | Mitsubishi Electric Corp | Insulation diagnosing apparatus for solid insulator in electric appliance |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4945786A (en) * | 1986-02-14 | 1990-08-07 | Toyoda Gosei Co., Ltd. | Steering wheel |
| JPH0777516A (en) * | 1993-07-12 | 1995-03-20 | Sumitomo Electric Ind Ltd | Nondestructive inspection equipment |
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