JPS61218958A - Method for measuring partial discharge of power cable - Google Patents
Method for measuring partial discharge of power cableInfo
- Publication number
- JPS61218958A JPS61218958A JP6029185A JP6029185A JPS61218958A JP S61218958 A JPS61218958 A JP S61218958A JP 6029185 A JP6029185 A JP 6029185A JP 6029185 A JP6029185 A JP 6029185A JP S61218958 A JPS61218958 A JP S61218958A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- partial discharge
- measured
- power cable
- coupling capacitor
- 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 11
- 239000003990 capacitor Substances 0.000 claims abstract description 23
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 230000008878 coupling Effects 0.000 claims description 21
- 238000010168 coupling process Methods 0.000 claims description 21
- 238000005859 coupling reaction Methods 0.000 claims description 21
- 239000004020 conductor Substances 0.000 claims description 13
- 230000006866 deterioration Effects 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract 4
- 238000005259 measurement Methods 0.000 description 7
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 239000012212 insulator Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、電力ケーブルに高電圧を印加し、ケーブル導
体とシース間で発生する部分放電パルスを結合コンデン
サにて取り出してケーブルの絶縁測定を行う、部分放電
測定方法に関する。[Detailed Description of the Invention] (Technical Field of the Invention) The present invention measures the insulation of the cable by applying a high voltage to a power cable and extracting the partial discharge pulse generated between the cable conductor and sheath using a coupling capacitor. , relates to a partial discharge measuring method.
（発明の技術的背景とその問題点）
従来、電力ケーブルにて電力を安定的に供給すべく、ケ
ーブルの絶縁状態を定期的に検査することが行われてい
る。(Technical Background of the Invention and Problems Thereof) Conventionally, in order to stably supply power through a power cable, the insulation state of the cable has been periodically inspected.
この検査方法の一つとして、電力ケーブルの終端部でケ
ーブル導体に結合コンデンサを並列的に接続し、ケーブ
ル導体とシース間に高電圧を印加して部分放電パルスを
発生させ、この部分放電パルスを結合コンデンサにて印
加電圧から抽出してリード線を介して測定回路側に送出
する、部分放電測定方法が知られている。One of the inspection methods is to connect a coupling capacitor in parallel to the cable conductor at the end of the power cable, apply a high voltage between the cable conductor and the sheath, and generate a partial discharge pulse. A partial discharge measuring method is known in which partial discharge is extracted from the applied voltage using a coupling capacitor and sent to the measurement circuit side via a lead wire.
しかし、従来は、電力ケーブルの終端部位置でケーブル
導体と結合コンデンサとを単に導電線にて電気的に接続
するだけであることから、この導電線がアンテナとして
作用し、外来ノイズが部分放電パルスと共にリード線を
介して測定回路側に送出されてしまう、そして、このよ
うに外来ノイズが送出される場合には、部分放電パルス
が微弱な電圧であるため、測定回路側で部分放電パルス
を正確に検出することができないという欠点があった。However, in the past, the cable conductor and the coupling capacitor were simply electrically connected at the end of the power cable using a conductive wire, and this conductive wire acted as an antenna, causing external noise to become a partial discharge pulse. In addition, when external noise is sent out in this way, the partial discharge pulse is a weak voltage, so it is difficult to accurately measure the partial discharge pulse on the measurement circuit side. The disadvantage was that it could not be detected.
（発明の目的）
本発明の目的は、外来ノイズの影響を受けることなく部
分放電パルスの発生を正確に検出することができる電力
ケーブルの部分放電測定方法を提供することにある。(Object of the Invention) An object of the present invention is to provide a method for measuring partial discharge in a power cable that can accurately detect the occurrence of a partial discharge pulse without being affected by external noise.
（発明の概要）
本発明は、被測定ケーブルの終端部及び該終端部でケー
ブル導体に並列接続されている結合コンデンサの少なく
とも外来ノイズ侵入側を電磁遮蔽ケースにて覆ったこと
を特徴とする。(Summary of the Invention) The present invention is characterized in that the terminal end of the cable to be measured and at least the external noise intrusion side of the coupling capacitor connected in parallel to the cable conductor at the terminal end are covered with an electromagnetic shielding case.
（発明の実施例）
以下５本発明の実施例を図面を参照して詳細に説明する
。(Embodiments of the Invention) Below, five embodiments of the present invention will be described in detail with reference to the drawings.
第２図には本発明の部分放電測定方法に用いる回路構成
が示され、被測定ケーブルである電力ケーブル１の終端
部２ではそのケーブル導体に高圧リードケーブル１０を
介して高電圧が印加される。電力ケーブル１のシースは
接地されている。FIG. 2 shows a circuit configuration used in the partial discharge measuring method of the present invention, in which a high voltage is applied to the cable conductor at the terminal end 2 of the power cable 1, which is the cable to be measured, via the high voltage lead cable 10. . The sheath of the power cable 1 is grounded.
終端部２の導体には結合コンデンサ３が並列的に接続さ
れ、結合コンデンサ３はリード線４を介して測定回路５
に接続されている。A coupling capacitor 3 is connected in parallel to the conductor of the termination section 2, and the coupling capacitor 3 is connected to the measurement circuit 5 via a lead wire 4.
It is connected to the.
電力ケーブル１の終端部２は、第１図に示すように、磁
器製のがい管６を備え、がい管６にはケーブルｌの端末
が挿入され、ケーブル導体の連結されている引出棒ＩＡ
が上方から突出している。がい管６はその下部が下部金
具６Ａにより支持台７上に固定され、その上部にはシー
ルドリング６Ｂが取付けられている。支持台７上にはが
い管６に隣接して結合コンデンサ３が固定され、結合コ
ンデンサ３の一方の端子が導電線８及び引出棒ＩＡを介
してケーブル導体に接続されている。As shown in FIG. 1, the terminal end 2 of the power cable 1 includes a porcelain insulator 6, into which the end of the cable l is inserted, and a pull-out rod IA to which the cable conductor is connected.
protrudes from above. The lower part of the insulator tube 6 is fixed on the support base 7 by a lower metal fitting 6A, and the shield ring 6B is attached to the upper part. A coupling capacitor 3 is fixed on the support base 7 adjacent to the peeling tube 6, and one terminal of the coupling capacitor 3 is connected to a cable conductor via a conductive wire 8 and a lead-out rod IA.
そして、結合コンデンサ３の一方の端子に高圧リードケ
ーブル１０が接続され、他方の端子にリード線４を介し
て測定回路５が接続されている。A high voltage lead cable 10 is connected to one terminal of the coupling capacitor 3, and a measuring circuit 5 is connected to the other terminal via a lead wire 4.
がい管６及び結合コンデンサ３は、外来ノイズの侵入側
が金属製で断面略台形状に形成されている電磁遮蔽ケー
ス９にて覆われ、この電磁遮蔽ケース９は支持台７上に
固定されている。The insulator tube 6 and the coupling capacitor 3 are covered with an electromagnetic shielding case 9 made of metal and having a substantially trapezoidal cross section on the side where external noise enters, and this electromagnetic shielding case 9 is fixed on the support base 7. .
次に、本発明に係る部分放電測定方法を説明する。Next, a partial discharge measuring method according to the present invention will be explained.
電力ケーブル１に高圧リードケーブル１０を介して高電
圧を印加する。この場合該ケーブルｌに劣化部Ｐが存在
すると、この劣化部Ｐで部分放電パルスが発生する。A high voltage is applied to the power cable 1 via the high voltage lead cable 10. In this case, if a deteriorated part P exists in the cable l, a partial discharge pulse is generated at this deteriorated part P.
この部分放電パルスは結合コンデンサ３によりリード線
４を介して測定回路５に送出される。測定回路５は、部
分放電パルスを増幅し、パルスカウンタにより計数し、
又シンクロスコープで測定する。従って、部分放電パル
スの計数値及びシンクロスコープの測定値から電力ケー
ブルの絶縁劣化状態を知ることができる。This partial discharge pulse is sent by the coupling capacitor 3 via the lead wire 4 to the measuring circuit 5. The measurement circuit 5 amplifies the partial discharge pulse, counts it with a pulse counter,
Also, measure with a synchroscope. Therefore, it is possible to know the insulation deterioration state of the power cable from the partial discharge pulse count value and the synchroscope measurement value.
さて、本発明方法では、結合コンデンサ３及び電力ケー
ブル１の終端部２の一側、即ち外来ノイズの侵入側を電
磁遮蔽ケース９にて覆ったので、導電線８に外来ノイズ
が侵入することがない。Now, in the method of the present invention, one side of the coupling capacitor 3 and the terminal end 2 of the power cable 1, that is, the side where external noise enters, is covered with the electromagnetic shielding case 9, so that external noise does not enter the conductive wire 8. do not have.
従って、測定回路５側には部分放電パルスのみが送出さ
れ、外来ノイズが送出されることはない。Therefore, only partial discharge pulses are sent out to the measurement circuit 5 side, and no external noise is sent out.
よって１部分放電パルスの発生を正確に検出することが
できる上に、部分放電パルス電圧の大きさ等を正確に把
握することができる。Therefore, not only can the occurrence of one partial discharge pulse be detected accurately, but also the magnitude of the partial discharge pulse voltage, etc. can be accurately grasped.
ところで、電力ケーブルｌのケーブル導体には高電圧を
印加するので、終端部２と電磁遮蔽ケース９の内壁面と
の間には大きな空間が必要である。従って、終端部２及
び結合コンデンサ３を全体的に覆う場合には筒状の大き
な電磁遮蔽ケースが必要になる。これに対して、外来ノ
イズが一方のみから侵入してくる場合には、上述したよ
うに、電力ケーブル１の終端部２及び結合コンデンサ３
の一側のみを断面略台形状の電磁遮蔽ケース９にて覆う
ので、電磁遮蔽ケース９の大きさは、これらを全体的に
覆う場合に比べて約１／２で済む、よって、断面略台形
状の電磁遮蔽ケース９を用いる場合には材料費及び重量
が小さいので、経済的な上に搬送作業が容易になる。By the way, since a high voltage is applied to the cable conductor of the power cable 1, a large space is required between the terminal end 2 and the inner wall surface of the electromagnetic shielding case 9. Therefore, in order to completely cover the termination section 2 and the coupling capacitor 3, a large cylindrical electromagnetic shielding case is required. On the other hand, if external noise enters from only one side, as described above, the terminal part 2 of the power cable 1 and the coupling capacitor 3
Since only one side is covered with the electromagnetic shielding case 9 having a substantially trapezoidal cross section, the size of the electromagnetic shielding case 9 is approximately 1/2 of that in the case where these are covered entirely. When the shaped electromagnetic shielding case 9 is used, the material cost and weight are small, so it is not only economical but also easy to transport.
尚、外来ノイズが反対方向からそれぞれ侵入してくる場
合には終端部２及び結合コンデンサ３を、上述したよう
に、筒状の大きな電流遮蔽ケースにてその全体を覆う。Incidentally, when external noise enters from opposite directions, the termination section 2 and the coupling capacitor 3 are entirely covered with a large cylindrical current shielding case as described above.
電磁遮蔽ケース９は、金属だけでなく電磁遮蔽機能を有
する部材から形成すればよいのは勿論である。Of course, the electromagnetic shielding case 9 may be formed not only from metal but also from a member having an electromagnetic shielding function.
（発明の効果）
本発明によれば、被測定ケーブルの終端部及び結合コン
デンサの少なくとも外来ノイズ侵入側を電磁遮蔽ケース
にて覆ったことで、外来ノイズの影響を受けずに、部分
放電パルスのみを測定回路側に送出することができる。(Effects of the Invention) According to the present invention, by covering the terminal end of the cable under test and at least the external noise intrusion side of the coupling capacitor with an electromagnetic shielding case, only partial discharge pulses can be generated without being affected by external noise. can be sent to the measurement circuit side.
従って、部分放電パルスの発生を正確に検出して被測定
ケーブルの絶縁劣化状態を高精度で測定することが可能
である。Therefore, it is possible to accurately detect the occurrence of partial discharge pulses and measure the insulation deterioration state of the cable under test with high precision.
第１図はケーブル終端部と結合コンデンサを電磁遮蔽ケ
ースにて覆った状態を示す正面図、第２図は本発明方法
に用いる回路構成図である。
１−−−−−一−−−電力ケーブル。
ＩＡ−−−−−−−一引出棒、
２−−−−−一−−−終端部、
３−−−−−−−−一結合コンデンサ、９−−−−−一
−−−電磁遮蔽ケース。
第１図FIG. 1 is a front view showing a state in which a cable termination and a coupling capacitor are covered with an electromagnetic shielding case, and FIG. 2 is a circuit configuration diagram used in the method of the present invention. 1------1---Power cable. IA---1 drawer rod, 2------1 end, 3------1 coupling capacitor, 9------1 electromagnetic shielding Case. Figure 1
Claims (1)
該導体とシース間で発生する部分放電パルスを、該被測
定ケーブルの終端部で導体に並列接続された結合コンデ
ンサにて取り出し、被測定ケーブルの絶縁状態を測定す
る電力ケーブルの部分放電測定方法において、前記被測
定ケーブルの終端部及び前記結合コンデンサの少なくと
も外来ノイズ侵入側を電磁遮蔽ケースにて覆うことを特
徴とする電力ケーブルの部分放電測定方法。Apply a high voltage to the conductor at the end of the cable under test,
In a method for measuring partial discharge of a power cable, the partial discharge pulse generated between the conductor and the sheath is extracted by a coupling capacitor connected in parallel to the conductor at the terminal end of the cable to be measured, and the insulation state of the cable to be measured is measured. . A method for measuring partial discharge of a power cable, characterized in that the terminal end of the cable to be measured and at least the external noise intrusion side of the coupling capacitor are covered with an electromagnetic shielding case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6029185A JPS61218958A (en) | 1985-03-25 | 1985-03-25 | Method for measuring partial discharge of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6029185A JPS61218958A (en) | 1985-03-25 | 1985-03-25 | Method for measuring partial discharge of power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61218958A true JPS61218958A (en) | 1986-09-29 |
Family
ID=13137906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6029185A Pending JPS61218958A (en) | 1985-03-25 | 1985-03-25 | Method for measuring partial discharge of power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61218958A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63253269A (en) * | 1987-04-10 | 1988-10-20 | Fujikura Ltd | Terminating equipment for measuring partial discharge |
| JP2015169474A (en) * | 2014-03-05 | 2015-09-28 | 三菱電線工業株式会社 | Partial discharge measuring device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS576367A (en) * | 1980-06-12 | 1982-01-13 | Chubu Electric Power Co Inc | Method for detecting partial discharge of power cable |
| JPS576368A (en) * | 1980-06-12 | 1982-01-13 | Chubu Electric Power Co Inc | Method for detecting partial discharge of power cable |
-
1985
- 1985-03-25 JP JP6029185A patent/JPS61218958A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS576367A (en) * | 1980-06-12 | 1982-01-13 | Chubu Electric Power Co Inc | Method for detecting partial discharge of power cable |
| JPS576368A (en) * | 1980-06-12 | 1982-01-13 | Chubu Electric Power Co Inc | Method for detecting partial discharge of power cable |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63253269A (en) * | 1987-04-10 | 1988-10-20 | Fujikura Ltd | Terminating equipment for measuring partial discharge |
| JP2015169474A (en) * | 2014-03-05 | 2015-09-28 | 三菱電線工業株式会社 | Partial discharge measuring device |
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