JPH0640121B2 - Method for measuring partial discharge of live cable - Google Patents
Method for measuring partial discharge of live cableInfo
- Publication number
- JPH0640121B2 JPH0640121B2 JP16241384A JP16241384A JPH0640121B2 JP H0640121 B2 JPH0640121 B2 JP H0640121B2 JP 16241384 A JP16241384 A JP 16241384A JP 16241384 A JP16241384 A JP 16241384A JP H0640121 B2 JPH0640121 B2 JP H0640121B2
- Authority
- JP
- Japan
- Prior art keywords
- partial discharge
- cable
- live
- live cable
- measuring
- 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.)
- Expired - Lifetime
Links
Landscapes
- Electric Cable Installation (AREA)
- Testing Relating To Insulation (AREA)
Description
【発明の詳細な説明】 ［発明の技術分野］ 本発明は活線ケーブルの部分放電測定法に係り、特に活
線ケーブルの絶縁体に起る部分放電を並列共振回路及び
同調増幅器より構成されてなる測定機器を用いて高感度
で検出せんとする活線ケーブルの部分放電測定法に関す
る。Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for measuring a partial discharge of a live cable, and in particular, a partial discharge occurring in an insulator of a live cable is constituted by a parallel resonant circuit and a tuning amplifier. Method for measuring partial discharge of a live-wire cable with high sensitivity using a measuring instrument.
［発明の技術的背景］ 従来から、第３図に示されているように活線ケーブル１
の始端及び終端夫々のシース３を接地し、該接地線に変
流器（ＣＴ）４を取り付けることにより部分放電の測定
を実施する方法が知られている。[Technical Background of the Invention] Conventionally, as shown in FIG.
A method is known in which the sheath 3 is grounded at each of the start end and the end and the current transformer (CT) 4 is attached to the ground wire to measure the partial discharge.
［背景技術の間題点］ しかしながらこの放電測定法においては、終端及び始端
の２点のシース３を接地して測定を行なう関係から、惹
起された放電パルスの通流する度合が小さくなり、尚か
つ雑音の影響を受け易くなる等して部分放電が高感度に
測定できない等の間題点を有している。[Problem point of background art] However, in this discharge measuring method, since the measurement is performed by grounding the two sheaths 3 at the terminal end and the starting end, the degree of conduction of the induced discharge pulse becomes small, and Moreover, there is a problem that the partial discharge cannot be measured with high sensitivity because it is easily affected by noise.
［発明の目的］ 本発明は叙上の間題点に鑑みなされたもので、活線ケー
ブルに絶縁障害が生じた場合に起る絶縁体の部分放電を
容易に、しかも高感度に検出し得る活線ケーブルの部分
放電測定法を提供することを目的とする。[Object of the Invention] The present invention has been made in view of the above problems, and it is possible to easily and highly sensitively detect a partial discharge of an insulator that occurs when an insulation fault occurs in a live cable. It is an object to provide a method for measuring a partial discharge of a live cable.
［発明の概要］ この目的を達成するために本発明の活線ケーブルの部分
放電測定法によれば、配設された所定長の活線ケーブル
を被覆しているシースの所定部位を並列共振回路を介し
て接地し、該ケーブルに生ずる部分放電に伴なう放電パ
ルスを該共振回路に導入し、そのうちの単一若しくは狭
帯域の特定周波信号のみを同調増幅し、該ケーブルの絶
縁状態を観測するものである。[Summary of the Invention] In order to achieve this object, according to the method for measuring the partial discharge of a live cable according to the present invention, a parallel resonance circuit is provided at a predetermined portion of a sheath covering a live cable having a predetermined length. Grounded through, introduce the discharge pulse accompanying the partial discharge generated in the cable into the resonant circuit, tune and amplify only a single or narrow band specific frequency signal, and observe the insulation state of the cable To do.
［発明の実施例］ 本発明の好ましい実施例を第１図を参照して詳述する。
本発明の活線ケーブルの部分放電測定法においては、ま
ずＡ端８からＢ端９に所定長の活線ケーブル１を配設す
るものであり、Ａ端８とＢ端９の夫々の近傍のシース３
に並列共振回路としてのＬＣ並列共振回路５、６を介し
て接地させている。これらのＬＣ並列共振回路５、６
は、商用周波に対しては間題とならない程度の低インピ
ーダンスであるが、該ケーブルに生ずる部分放電に伴な
う放電パルスのうちの単一若しくは狭帯域の特定の周波
数を持った信号に対しては、400KHZ程度で共振するよう
に設計されている。このＬＣ並列共振回路６の後段には
該周波数に同調する同調増幅器７があって部分放電を高
感度で検出して該ケーブル１の絶縁状態を観測せんとし
ている。また本測定法の応用例としては、第２図に示し
た如き活線ケーブル１０への適用が考えられる。まず接
地線なしのジョイント１１での部分放電は、該ジョイン
ト１１の防食層上に金属箔１２を被せてコンデンサを形
成させ、該コンデンサ１２に並列共振回路１３と同調増
幅器７を接続させることによっても観測し得る。Embodiment of the Invention A preferred embodiment of the present invention will be described in detail with reference to FIG.
In the method for measuring a partial discharge of a live cable according to the present invention, first, a live cable 1 having a predetermined length is disposed from the A end 8 to the B end 9, and the live cable 1 near each of the A end 8 and the B end 9 is disposed. Sheath 3
Is grounded via LC parallel resonance circuits 5 and 6 as parallel resonance circuits. These LC parallel resonance circuits 5 and 6
Is a low impedance that does not pose a problem for commercial frequencies, but for signals with a single or narrow band specific frequency among the discharge pulses accompanying partial discharge occurring in the cable. Is designed to resonate at about 400KHZ. A tuning amplifier 7 that tunes to the frequency is provided at the subsequent stage of the LC parallel resonance circuit 6, and detects the partial discharge with high sensitivity to observe the insulation state of the cable 1. Further, as an application example of this measuring method, application to a live cable 10 as shown in FIG. 2 is considered. First, partial discharge at the joint 11 without a ground wire is also achieved by covering the anticorrosion layer of the joint 11 with a metal foil 12 to form a capacitor, and connecting the parallel resonant circuit 13 and the tuning amplifier 7 to the capacitor 12. It can be observed.
［発明の効果］ 以上の実施例からも明らかなように本発明の活線ケーブ
ルの部分放電測定法によれば、配設された所定長の活線
ケーブルを被覆しているシースの所定部位を並列共振回
路を介して接地し、該ケーブルに生ずる部分放電に伴な
う放電パルスを該共振回路に導入し、そのうちの単一若
しくは狭帯域の特定周波信号のみを同調増幅し、該ケー
ブルの絶縁状態を観測するので、活線ケーブルに絶縁障
害が生じた場合に起る絶縁体の部分放電を容易に、しか
も高感度に検出し得る等の効果を奏する。[Effects of the Invention] As is apparent from the above examples, according to the method for measuring a partial discharge of a live cable according to the present invention, a predetermined portion of the sheath that covers the arranged live cable of a predetermined length is Insulation of the cable by grounding it through a parallel resonance circuit, introducing a discharge pulse accompanying partial discharge that occurs in the cable into the resonance circuit, and tuning and amplifying only a single or narrow band specific frequency signal among them. Since the state is observed, the partial discharge of the insulator, which occurs when an insulation failure occurs in the live cable, can be detected easily and with high sensitivity.
第１図は本発明による活線ケーブルの部分放電測定法に
供される装置構成を示す結線図、第２図は活線ケーブル
の一部に接地線が備わっていない特殊な活線ケーブルの
部分放電測定法に供される装置構成を示す結線図、第３
図は従来における活線ケーブルの部分放電測定法に供さ
れる装置構成を示す結線図である。 １……活線ケーブル ３……シース ５、６……ＬＣ共振回路 ７……同調増幅器FIG. 1 is a connection diagram showing a device configuration used for a method for measuring partial discharge of a live cable according to the present invention, and FIG. 2 is a special live cable portion in which a part of the live cable is not provided with a ground wire. Connection diagram showing the configuration of the device used for the electric discharge measurement method, No. 3
FIG. 1 is a connection diagram showing a device configuration used for a conventional method of measuring a partial discharge of a live cable. 1 ... Live cable 3 ... Sheath 5, 6 ... LC resonant circuit 7 ... Tuning amplifier
Claims (1)
ているシースの所定部位を並列共振回路を介して接地
し、該ケーブルに生ずる部分放電に伴なう放電パルスを
該共振回路に導入し、そのうちの単一若しくは狭帯域の
特定周波信号のみを同調増幅し、該ケーブルの絶縁状態
を観測することを特徴とする活線ケーブルの部分放電測
定法。1. A predetermined portion of a sheath covering a live cable of a predetermined length provided is grounded via a parallel resonance circuit, and a discharge pulse accompanying a partial discharge generated in the cable is generated in the resonance circuit. A method for measuring partial discharge of a live-wire cable, characterized by introducing into a method, observing the insulation state of the cable by tuning and amplifying only a single or narrow band specific frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16241384A JPH0640121B2 (en) | 1984-07-31 | 1984-07-31 | Method for measuring partial discharge of live cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16241384A JPH0640121B2 (en) | 1984-07-31 | 1984-07-31 | Method for measuring partial discharge of live cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6140571A JPS6140571A (en) | 1986-02-26 |
| JPH0640121B2 true JPH0640121B2 (en) | 1994-05-25 |
Family
ID=15754125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16241384A Expired - Lifetime JPH0640121B2 (en) | 1984-07-31 | 1984-07-31 | Method for measuring partial discharge of live cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0640121B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0255968A (en) * | 1988-08-19 | 1990-02-26 | Sumitomo Electric Ind Ltd | Detecting method for partial discharge of electric power cable |
| JP2540918B2 (en) * | 1988-09-30 | 1996-10-09 | 日立電線株式会社 | Insulation deterioration monitoring device for cable lines |
| JPH067148B2 (en) * | 1988-12-21 | 1994-01-26 | 日立電線株式会社 | Partial discharge measurement method |
| JPH068846B2 (en) * | 1989-11-29 | 1994-02-02 | 日立電線株式会社 | Partial discharge measurement method |
| JPH068845B2 (en) * | 1989-10-25 | 1994-02-02 | 日立電線株式会社 | Partial discharge measurement method |
| JPH068851B2 (en) * | 1989-12-02 | 1994-02-02 | 日立電線株式会社 | Partial discharge measurement method |
| CN112179959B (en) * | 2020-11-02 | 2022-10-21 | 国家电网有限公司 | High-voltage cable insulating layer damage detection device and signal processing method |
-
1984
- 1984-07-31 JP JP16241384A patent/JPH0640121B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6140571A (en) | 1986-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5469067A (en) | Detecting partial discharge using a detection coil and analysis of output signal and noise frequency spectrums | |
| KR20150082335A (en) | High performance sensor for partial discharge signal-analyzing systems | |
| JPH0640121B2 (en) | Method for measuring partial discharge of live cable | |
| JP3199726B2 (en) | Partial discharge detection device | |
| JP2546417B2 (en) | Partial discharge measurement method | |
| US3440528A (en) | Method and apparatus for locating voids in an insulated electrical cable | |
| JPH0519008A (en) | Partial discharge detector | |
| JPH0545404A (en) | Partial discharge sensor | |
| JP3236770B2 (en) | Partial discharge measurement method for CV cable line | |
| JPH06186277A (en) | Method of testing resonance-type partial-discharge detection apparatus | |
| JPH05149994A (en) | Detecting sensor for partial discharge | |
| JPH04320977A (en) | Partial discharge position orientation method | |
| JP3107361B2 (en) | Partial discharge detection method | |
| JPH067146B2 (en) | Partial discharge measurement method | |
| JPH06201759A (en) | Partial discharge sensor | |
| JPH0353583B2 (en) | ||
| JPH06273472A (en) | Partial discharge detection sensor | |
| JP2860002B2 (en) | High frequency partial discharge sensor | |
| JPH04337482A (en) | Partial discharge sensor | |
| JP2978597B2 (en) | Partial discharge sensor | |
| JP3333725B2 (en) | Partial discharge measurement method | |
| JPH04140673A (en) | Partial discharge detection device | |
| JPH06294839A (en) | Partial discharge position detecting method for power cable | |
| JPH03162684A (en) | Method for detecting partial discharge of power cable | |
| JPH06308191A (en) | Testing method for resonance type partial discharge detector |