JPH02167483A - Measuring method for partial discharge - Google Patents
Measuring method for partial dischargeInfo
- Publication number
- JPH02167483A JPH02167483A JP32276988A JP32276988A JPH02167483A JP H02167483 A JPH02167483 A JP H02167483A JP 32276988 A JP32276988 A JP 32276988A JP 32276988 A JP32276988 A JP 32276988A JP H02167483 A JPH02167483 A JP H02167483A
- Authority
- JP
- Japan
- Prior art keywords
- partial discharge
- detection impedance
- signal generator
- impedance
- calibration signal
- 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
Links
- 238000000034 method Methods 0.000 title claims description 8
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000000691 measurement method Methods 0.000 claims description 4
- 239000012212 insulator Substances 0.000 claims description 3
- 230000006866 deterioration Effects 0.000 claims 1
- 239000004020 conductor Substances 0.000 abstract description 10
- 239000003990 capacitor Substances 0.000 abstract description 8
- 238000009413 insulation Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は測定感度の較正が容易に行える部分放電測定方
法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a partial discharge measuring method that allows easy calibration of measurement sensitivity.
第４図（ａ）は従来の部分放電測定方法を示す。電カケ
ープル１０が中間接続部２０を介して接続されており、
両端に終端接続部１１が設けられている。終端接続部１
１には高電圧課電端子１２が設けられており、中間接続
部２０の金属シース（金属胴管）は検出インピーダンス
６を介してアースされている。FIG. 4(a) shows a conventional partial discharge measuring method. An electric cable 10 is connected via an intermediate connection part 20,
Terminal connection portions 11 are provided at both ends. Termination connection part 1
1 is provided with a high voltage charging terminal 12 , and the metal sheath (metal trunk tube) of the intermediate connection portion 20 is grounded via a detection impedance 6 .
検出インピーダンス６の両端の電位差を検出するために
測定器７が接続されている。尚、ＣＫは結合コンデンサ
である。A measuring device 7 is connected to detect the potential difference between both ends of the detection impedance 6 . Note that CK is a coupling capacitor.
以上の構成において、高電圧課電端子１２に高電圧を課
電する。この状態において、中間接続部２０の絶縁体に
部分放電が生じると、導体および金属シースに高周波パ
ルスが誘起し、金属シースの高周波パルスが検出インピ
ーダンス６に流れてその両端に高周波パルスの大きさに
比例した電位差が生じる。その電位差を測定器７によっ
て検出することにより部分放電を測定する。In the above configuration, a high voltage is applied to the high voltage charging terminal 12. In this state, when a partial discharge occurs in the insulator of the intermediate connection part 20, a high-frequency pulse is induced in the conductor and the metal sheath, and the high-frequency pulse in the metal sheath flows to the detection impedance 6, and the magnitude of the high-frequency pulse is applied to both ends of the high-frequency pulse. A proportional potential difference results. The partial discharge is measured by detecting the potential difference with the measuring device 7.
測定器７の測定感度を較正するときは、高電圧端子１２
の高電圧課電を停止し、較正信号発生器５を終端接続部
１１の近傍に接続して電カケープル１０の導体と金属シ
ースの間に較正用の高周波パルスを印加する。その等価
回路を第４図（ｂ）に示す。第４図（ｂ）に示すように
、較正信号発生器５は■。ボルトの高周波パルスを静電
容量Ｃ６のコンデンサを介して電カケープル１０の導体
８と金属シース１の間に加える。導体８と金属シース１
の間には静電容量Ｃが形成され、静電容量Ｃのコンデン
サを流れた高周波パルスは検出インピーダンス６に分流
する。このようにして測定器７の感度較正が行われる。When calibrating the measurement sensitivity of the measuring device 7, the high voltage terminal 12
The high voltage application is stopped, the calibration signal generator 5 is connected near the terminal connection part 11, and a high frequency pulse for calibration is applied between the conductor of the power cable 10 and the metal sheath. The equivalent circuit is shown in FIG. 4(b). As shown in FIG. 4(b), the calibration signal generator 5 is . A high frequency pulse of volts is applied between the conductor 8 of the power cable 10 and the metal sheath 1 via a capacitor of capacitance C6. Conductor 8 and metal sheath 1
A capacitance C is formed between the capacitors and the high frequency pulse flowing through the capacitor having the capacitance C is shunted to the detection impedance 6. In this way, the sensitivity calibration of the measuring device 7 is performed.
ここで、静電容量Ｃのコンデンサによる見掛けの放電電
荷をＱとし、電位差をＶ、とすると、
Ｑ−Ｖｏ −Ｃｏ −Ｖ＋ ・Ｃ−−−−−（１）
（１）式より
ｃ。Here, if the apparent discharge charge by a capacitor with capacitance C is Q and the potential difference is V, then Q-Vo -Co -V+ ・C------(1)
From formula (1), c.
Ｖ、＝ Ｖ。 −−−−−−−−−−−
（２）が得られる。V,=V. −−−−−−−−−−−
(2) is obtained.
〔発明が解決しようとする課題〕
しかし、従来の部分放電測定方法によると、電カケープ
ル線路が数Ｋｍというように長尺になると、較正用の高
周波パルスが中間接続部２０に伝送されてくるまで、そ
のレベルＶｌが減衰するため、また、通常はＣ＞Ｃ，で
あるため、（２）式の■、の値が小さくなり、所定の較
正操作を行うことができないという不都合がある。更に
、較正信号発生器を接続する終端接続部の位置と較正操
作を行う中間接続部の位置が離れているため、作業性が
悪いという不都合がある。[Problems to be Solved by the Invention] However, according to the conventional partial discharge measurement method, when the electric cable line becomes long, such as several kilometers long, the high frequency pulse for calibration is transmitted to the intermediate connection part 20. , the level Vl is attenuated, and usually C>C, so the value of (2) in equation (2) becomes small, causing the inconvenience that a predetermined calibration operation cannot be performed. Furthermore, since the position of the terminal connection part to which the calibration signal generator is connected is far from the position of the intermediate connection part to which the calibration operation is performed, there is a disadvantage that workability is poor.
従って、本発明の目的は所定のレベルの較正信号を得る
ことができる部分放電測定方法を提供することである。Therefore, it is an object of the present invention to provide a partial discharge measuring method that allows obtaining a calibration signal of a predetermined level.
本発明の他の目的は較正操作の作業性を改善した部分放
電測定方法を提供することである。Another object of the present invention is to provide a partial discharge measuring method that improves the workability of the calibration operation.
本発明は上記の目的を実現するため、部分放電によって
誘起される高周波パルスが流れる導電部材（例えば、金
属シース）を分離し、その間に検出インピーダンスを挿
入して接続するとともに検出インピーダンスと並列に較
正信号発生器を接続した部分放電測定方法を提供する。In order to achieve the above object, the present invention separates a conductive member (for example, a metal sheath) through which a high-frequency pulse induced by partial discharge flows, inserts and connects a detection impedance between them, and calibrates it in parallel with the detection impedance. Provided is a partial discharge measurement method that connects a signal generator.
部分放電によって誘起される高周波パルスの流れる導電
部材が金属シースの場合は、金属シースを作業工具等を
使用して一部取り除いて分離する。If the conductive member through which the high-frequency pulses induced by the partial discharge flow is a metal sheath, the metal sheath is partially removed and separated using a working tool or the like.
絶縁接続部の場合は、既に絶縁筒によって絶縁分離され
ているのでこのような作業は不要である。In the case of an insulated connection part, such work is not necessary since the connection part is already insulated and separated by an insulating tube.
分離された金属シースの間に検出インピーダンスを挿入
し、検出インピーダンスに並列に較正信号発生器が接続
される。A detection impedance is inserted between the separated metal sheaths, and a calibration signal generator is connected in parallel to the detection impedance.
以下、本発明の部分放電測定方法を詳細に説明する。 Hereinafter, the partial discharge measuring method of the present invention will be explained in detail.
第１図は本発明の一実施例を示し、金属シース１に接続
された絶縁接続部の金属胴管２は絶縁筒３によって絶縁
されており、金属胴管２の端子４に較正信号発生器５お
よび検出インピーダンス６が並列になるように接続され
ている。検出インピーダンス６には測定器７が接続され
、その両端の電位差を検出するようになっている。FIG. 1 shows an embodiment of the present invention, in which a metal body tube 2 of an insulated connection part connected to a metal sheath 1 is insulated by an insulating tube 3, and a calibration signal generator is connected to a terminal 4 of the metal body tube 2. 5 and detection impedance 6 are connected in parallel. A measuring device 7 is connected to the detection impedance 6 to detect the potential difference between both ends thereof.
第２図は第１図の実施例を回路的に示したものであり、
電カケープルの導体８は接続スリーブ９によって接続さ
れ、導体８と金属シース１の間に静電容３１ｃ、 、Ｃ
２のコンデンサが形成され、金属シース１は絶縁筒３に
よって絶縁されている。FIG. 2 is a circuit diagram of the embodiment shown in FIG.
The conductors 8 of the power cable are connected by a connecting sleeve 9, and capacitances 31c, , C are formed between the conductors 8 and the metal sheath 1.
2 capacitors are formed, and the metal sheath 1 is insulated by an insulating cylinder 3.
較正信号発生器５、検出インピーダンス６、および測定
器７は第１図に示した通りである。The calibration signal generator 5, detection impedance 6, and measuring device 7 are as shown in FIG.
第３図（ａ）は第２図の等価回路であり、同一部分は同
一の引用数字で示したので重複する説明は省略する。こ
の等価回路において、Ｃ，＝Ｃ２゜Ｃ＋ ）Ｃｏ と仮
定すると、
検出インピーダンス６の両端に加わる電位差Ｖ２は、
しＳ
ここで、ＣｏＸＣ，、Ｃ２、Ｖｏは既知、あるいは測定
可能である。従来の技術で説明した（２）式と、本発明
の（３）式を比較すると、
Ｖ ２ ＝ ２ Ｖ １−−−−−−−−（４）となる
。ただし、Ｃ＝Ｃ，とした。（４）式より明らかなよう
に、従来に比較して２倍のレベルで高周波パルスを検出
することが可能になり、しかも、長尺の電カケープルを
伝搬することによって生じる減衰を考慮する必要はない
。FIG. 3(a) is an equivalent circuit of FIG. 2, and since the same parts are indicated by the same reference numerals, redundant explanation will be omitted. In this equivalent circuit, assuming that C,=C2°C+)Co, the potential difference V2 applied across the detection impedance 6 is:S Here, CoXC,, C2, and Vo are known or can be measured. Comparing equation (2) described in the related art and equation (3) of the present invention, V 2 = 2 V 1 (4). However, C=C. As is clear from equation (4), it is now possible to detect high-frequency pulses at twice the level compared to the conventional method, and there is no need to take into account the attenuation caused by propagation through long electrical cables. do not have.
第３図（ａ）の等価回路は、静電容量ＣＩのコンデンサ
の側から部分放電が生じた場合の等価回路に変換すると
第３図（ｂ）のようになる。The equivalent circuit of FIG. 3(a) is converted into an equivalent circuit as shown in FIG. 3(b) when partial discharge occurs from the capacitor side of the capacitance CI.
以上の実施例では、Ｃｚ ＝Ｃ２、Ｚ＞ＺＣ２を条件と
して説明したが、この条件を満たさない場合でも、基本
式をもとに補正項を求めることにより較正は可能である
。Although the above embodiments have been described under the conditions of Cz = C2 and Z>ZC2, even if these conditions are not met, calibration is possible by finding a correction term based on the basic equation.
以上説明した通り、本発明の部分放電測定方法によると
、部分放電によって誘起される高周波パルスが流れる導
電部材（例えば、金属シース）を分離し、その間に検出
インピーダンスと較正信号発生器を並列に接続して挿入
したため、以下の効果を奏することができる。As explained above, according to the partial discharge measurement method of the present invention, a conductive member (for example, a metal sheath) through which a high-frequency pulse induced by a partial discharge flows is separated, and a detection impedance and a calibration signal generator are connected in parallel between them. Since it is inserted as follows, the following effects can be achieved.
（１）長尺ケーブル線路の途中から部分放電の測定がで
きる。(1) Partial discharge can be measured from the middle of a long cable line.
（２）較正用の高周波パルスの波形の歪みや減衰が生し
ない。(2) No distortion or attenuation of the waveform of the high-frequency pulse for calibration occurs.
（３）較正信号発生器と測定器が同一の位置にあるため
、作業性が良い。(3) Workability is good because the calibration signal generator and measuring device are located at the same location.
（４）高圧導体に較正用の高周波パルスを注入する必要
がないので安全性が高い。(4) High safety because there is no need to inject high-frequency pulses for calibration into the high-voltage conductor.
（５）活線状態においても感度較正ができる。(5) Sensitivity calibration can be performed even in live line conditions.
第１図は本発明の一実施例を示す説明図。第２図は第１
図の回路的な説明図。第３図（ａ）、（ｂ）は第２図の
等価回路図、第４図（ａ）、（ｂ）は従来の部分放電測
定方法の説明図および等価回路図。
符号の説明
１−−−−−−−−−−−金属シース ２−〜−−
−−−−−−金属胴管３−−−−−−−−絶縁筒
４ ＝−−−−−−−−一端子５−−−−−−−−
−−較正信号発生器６−−−−−−−−−一検出インピ
ーダンス測定器
接続スリーブ
終端接続部
ケーブル導体
電力ケーブル
ー 中間接続部FIG. 1 is an explanatory diagram showing one embodiment of the present invention. Figure 2 is the first
A circuit explanatory diagram of the figure. 3(a) and 3(b) are equivalent circuit diagrams of FIG. 2, and FIGS. 4(a) and 4(b) are explanatory diagrams and equivalent circuit diagrams of a conventional partial discharge measuring method. Explanation of symbols 1-----------Metal sheath 2---
---------Metal trunk tube 3-----Insulation tube
4 =−−−−−−−−one terminal 5−−−−−−−−
--Calibration signal generator 6-----Detection impedance measuring device Connection sleeve Termination connection Cable conductor Power cable Intermediate connection
Claims (1)
の劣化を診断する部分放電測定方法において、 前記部分放電によって高周波パルスが誘起される導電部
材を分離し、 前記導電部材の分離した間に検出インピーダンスを挿入
して部分放電を測定し、 前記検出インピーダンスに並列に較正パルス発生器を接
続して前記部分放電を測定する測定器を較正することを
特徴とする部分放電測定方法。[Claims] In a partial discharge measuring method for diagnosing deterioration of an insulator by measuring partial discharge in an insulator to which a high voltage is applied, a conductive member in which a high frequency pulse is induced by the partial discharge is separated. , a detection impedance is inserted between the separated conductive members to measure partial discharge, and a calibration pulse generator is connected in parallel to the detection impedance to calibrate the measuring device for measuring the partial discharge. Partial discharge measurement method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32276988A JPH067147B2 (en) | 1988-12-21 | 1988-12-21 | Partial discharge measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32276988A JPH067147B2 (en) | 1988-12-21 | 1988-12-21 | Partial discharge measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02167483A true JPH02167483A (en) | 1990-06-27 |
| JPH067147B2 JPH067147B2 (en) | 1994-01-26 |
Family
ID=18147440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32276988A Expired - Lifetime JPH067147B2 (en) | 1988-12-21 | 1988-12-21 | Partial discharge measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH067147B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017011809A (en) * | 2015-06-18 | 2017-01-12 | 株式会社ビスキャス | Power cable connection part protection pipe, and detection component for partial discharge measurement |
-
1988
- 1988-12-21 JP JP32276988A patent/JPH067147B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017011809A (en) * | 2015-06-18 | 2017-01-12 | 株式会社ビスキャス | Power cable connection part protection pipe, and detection component for partial discharge measurement |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH067147B2 (en) | 1994-01-26 |
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