JPH03214073A - How to measure DC leakage current of power cables - Google Patents
How to measure DC leakage current of power cablesInfo
- Publication number
- JPH03214073A JPH03214073A JP2008116A JP811690A JPH03214073A JP H03214073 A JPH03214073 A JP H03214073A JP 2008116 A JP2008116 A JP 2008116A JP 811690 A JP811690 A JP 811690A JP H03214073 A JPH03214073 A JP H03214073A
- Authority
- JP
- Japan
- Prior art keywords
- leakage current
- cable
- signal
- shield ring
- leakage
- 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
- 238000001514 detection method Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 9
- 230000006866 deterioration Effects 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 239000004020 conductor Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Locating Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、超高圧送電用↑［カケ−プルの直流洩れ電流
測定方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring direct current leakage current of a cable for ultra-high voltage power transmission.
従来の直流洩れ電流測定方法の一例を第３図に示す。■
は被測定ケーブルであり、その両路端部２及び３には導
体引出棒４．ブッシング５及びシールドリング６を夫々
取り付ける。７は試験用の直流高電圧を発生するための
電源であり、その高圧側端子は一方の終端部２の導体引
出棒４に接続し、その低圧側端子は電流検出器８を介し
て接地電位９に接続する。被測定ケーブル１の遮蔽層も
接地電位９に接続する。An example of a conventional DC leakage current measuring method is shown in FIG. ■
is a cable to be measured, and conductor pull-out rods 4. are attached to both ends 2 and 3 of the cable. Attach the bushing 5 and shield ring 6, respectively. 7 is a power source for generating a DC high voltage for testing, its high voltage side terminal is connected to the conductor pull-out rod 4 at one terminal end 2, and its low voltage side terminal is connected to the ground potential through a current detector 8. Connect to 9. The shielding layer of the cable under test 1 is also connected to the ground potential 9.
直流電源から導体引出棒４に高電圧を印加すると、被測
定ケーブル１に洩れ電流が発生し、この電流は、直流電
源７の低圧側に接続した電流検出器８によって検出（測
定）される。なお、ブッシング５の沿面放電電流による
測定誤差を防ぐため。When a high voltage is applied to the conductor pull-out rod 4 from a DC power source, a leakage current is generated in the cable 1 to be measured, and this current is detected (measured) by a current detector 8 connected to the low voltage side of the DC power source 7. Note that this is to prevent measurement errors due to creeping discharge current of the bushing 5.
ガード電極１０が夫々のブッシング５に設けられ、同電
極は直流電源７の低圧側に直接接続されている。A guard electrode 10 is provided on each bushing 5 and is directly connected to the low voltage side of the DC power supply 7.
上記の方法は、原理的には優れているものの、高圧側の
各部に発生するコロナ放電に伴う測定誤差を防ぐことが
できない。また５種々の作業条件の制約から、電流検出
器を直流電源の低圧側に配置することができない場合が
あり、その場合は、直′ｄｔ１１ ｉｌｌの高圧側に電
流検出器を配置せざるを得ないという欠点がある。Although the above method is excellent in principle, it cannot prevent measurement errors caused by corona discharge occurring in various parts on the high voltage side. Furthermore, due to various work condition constraints, it may not be possible to place the current detector on the low-voltage side of the DC power supply, and in that case, the current detector must be placed on the high-voltage side of the DC power supply. There is a drawback that there is no
直流電源の高圧側に電流検出器を配置した場合には、出
力信号の取出が困難となる。その対策として、例えば特
公昭６４−４６２８号公報記載のように、電流検出器の
出力信号を光信号に変換した後、同信号を光ファイバー
を用いて取り出すことが提案された。しかし、如何に絶
縁特性に優れた光ファイバーといえども、超高圧の条件
下では可成りの沿面放電が発生し、それによる測定誤差
を無視することができない。しかも、光ファイバーの沿
面閃絡電圧は、超高圧電カケ−プルの試験の観点から見
る限り木だ不充分であって、大気の湿度が高い場合には
重大な閃絡事故につながる危険性がある。If the current detector is placed on the high voltage side of the DC power supply, it will be difficult to extract the output signal. As a countermeasure, it has been proposed to convert the output signal of a current detector into an optical signal and then extract the signal using an optical fiber, as described in Japanese Patent Publication No. 64-4628, for example. However, no matter how excellent the insulating properties of optical fibers are, considerable creeping discharge occurs under ultra-high voltage conditions, and measurement errors caused by this cannot be ignored. Furthermore, the creeping voltage of optical fibers is insufficient from the perspective of testing ultra-high voltage electrical cables, and there is a risk of serious flashover accidents when the atmospheric humidity is high. .
なお、′市カケープルの直流洩れ電流は、いオ）ゆる改
編法による絶縁抵抗測定器を用いて間接的に測定するこ
とも可能であるが、この方法は、被測定ケーブルに高電
圧を印加した状態では使用することができないため、超
高圧電カケ−プルの試験の目的には本質的に不向きであ
る。Note that it is also possible to measure the direct current leakage current of a cable cable indirectly using an insulation resistance measuring device using the modified method; It is essentially unsuitable for the purpose of testing ultra-high voltage electrical cables.
本発明の目的は、上記のような従来技術の欠点を全て解
消し、どのような条件下でも正確がり安全に超高圧電カ
ケ−プルの直流洩れ電流を測定することができる改良さ
れた方法を堤供しようとするものである。The object of the present invention is to provide an improved method that eliminates all the drawbacks of the prior art as described above and allows for accurate and safe measurement of DC leakage current of ultra-high voltage electrical cables under any conditions. This is what they are trying to offer.
上記の課題は、被測定ケーブルの終端部に設けたシール
ドリング内に洩れ電流検出装置、信号処理装置、無線送
信装置、アンテナその他の必要な装置を収納し、洩れ電
流検出装置の出力信号を高周波信号に変換した後、シー
ルドリングの一部に設けた電波漏洩窓から地上の無線受
信装置に伝送することによって解決することが可能であ
る。The above problem is solved by housing the leakage current detection device, signal processing device, wireless transmitter, antenna, and other necessary devices in the shield ring provided at the end of the cable under test, and converting the output signal of the leakage current detection device into a high-frequency This can be solved by converting the signal into a signal and then transmitting it to a radio receiver on the ground through a radio wave leakage window provided in a part of the shield ring.
送信用のアンテナをシールドリングの外側に設けたので
は、コロナ放電による電波ＦＩＩ害や絶縁破壊による機
器破損の大きな原因となる。このため。If the transmitting antenna is provided outside the shield ring, it will be a major cause of radio wave FII damage due to corona discharge and equipment damage due to insulation breakdown. For this reason.
本発明においては、アンテナを含む一切の必要な装置を
シールドリング内に収納する。しかし、これでは電波が
シールドリングによって遮蔽されてし７まうので、シー
ルドリングの一部に電波の漏洩窓を設け、この窓から電
波を漏洩させる。このようにすれば、電波障害や機器破
損などを伴うことなく、洩れ電流検出器の出力信号を地
上の無線受信装置へ空間伝送することができる。In the present invention, all necessary equipment including the antenna is housed within the shield ring. However, in this case, the radio waves are blocked by the shield ring, so a radio wave leakage window is provided in a part of the shield ring, and the radio waves are leaked through this window. In this way, the output signal of the leakage current detector can be spatially transmitted to the radio receiver on the ground without causing radio wave interference or equipment damage.
（実施例Ｊ
第１図は１本発明による直流洩れ電流１１１１１定方法
を説明するための系統図である。図において、１１は被
測定ケーブルであり、その終端部には、従来の場合と同
様、シールドリング１２が設けられている。１４はイン
ピーダンスによる電位降下を利用した洩れ電流検出装置
、 １５は洩れ＠流検出装置の出カイ、１号を読み取っ
て同信号をディジタル信号に変換するための信号処理装
置、１６は信号処理装置１５の出力信号を高周波信号に
変換して送信するための無線送信装置、１７は無線送信
装置１６に接続されたアンテナ、１８は信号処理装置１
５及び無線送信装置１Ｇを駆動するためのバッテリー電
源であり、これらの装置は全てシールドリング１２内に
収納されている。なお、１９は被測定ケーブル１１の芯
線を弓き出すための導体引出棒、２０は試験用のＩＩＩ
流高定高電圧生するための直流電源である。(Example J Figure 1 is a system diagram for explaining the DC leakage current 11111 determination method according to the present invention. In the figure, numeral 11 is a cable to be measured, and the terminal end thereof is the same as in the conventional case. , a shield ring 12 is provided. 14 is a leakage current detection device that utilizes potential drop due to impedance, 15 is an output of the leakage current detection device, and 15 is a device for reading No. 1 and converting the same signal into a digital signal. A signal processing device, 16 a wireless transmitter for converting the output signal of the signal processing device 15 into a high frequency signal and transmitting it, 17 an antenna connected to the wireless transmitter 16, 18 a signal processing device 1
5 and a battery power source for driving the wireless transmitter 1G, and these devices are all housed within the shield ring 12. In addition, 19 is a conductor pull-out rod for pulling out the core wire of the cable to be measured 11, and 20 is a III for testing.
This is a DC power supply for generating high voltage with constant current.
洩れ電流検出装置１４はシールドリング１２と導体引出
棒１９との間に接続されている。また、直流電源２０の
高圧側端子はシールドリング［２に接続され。Leakage current detection device 14 is connected between shield ring 12 and conductor pull-out rod 19. Further, the high voltage side terminal of the DC power supply 20 is connected to the shield ring [2.
その低圧側端子は被測定ケーブル１１の遮蔽層２１と共
に接地電位２２に接続されている。The low voltage side terminal is connected to the ground potential 22 together with the shielding layer 21 of the cable 11 to be measured.
シールドリング１２と被測定ケーブル１１の遮蔽層２１
（接地電位２２）との間に直流電源２０からの高電圧を
印加すると、絶縁体の劣化に起因する直流洩れ電流が被
測定ケーブル１１に流れる。このため。Shield ring 12 and shield layer 21 of cable under test 11
When a high voltage is applied from the DC power source 20 to the ground potential 22, a DC leakage current due to deterioration of the insulator flows into the cable 11 to be measured. For this reason.
洩れ電流検出器ｆａ１４の出力端子には、洩れ電流に比
例した出力信号が現われる。この出力信号は信号処理袋
！１５によって読み取られ、同装置内においてディジタ
ル信号に変換される。このディジタル信号は、更に無線
送信装！１１．６によって高周波信号に変換された後、
電波となってアンテナ１７から送信される。An output signal proportional to the leakage current appears at the output terminal of the leakage current detector fa14. This output signal is a signal processing bag! 15 and converted into a digital signal within the same device. This digital signal is further transmitted by a wireless transmitter! After being converted into a high frequency signal by 11.6,
It becomes a radio wave and is transmitted from the antenna 17.
アンテナ１７からの電波を外部に放射させるために、シ
ールドリング１２の一部に電波漏洩窓２：Ｉを開けてお
く。この漏洩窓の構造は、使用する電波の種類によって
異なるが、通常の場合は、シールドリング１２の金属壁
を一部切り取ったスリット状の窓が望ましい。その寸法
は、電波の種類又は波長によって必然的に定まる。In order to radiate radio waves from the antenna 17 to the outside, a radio wave leakage window 2:I is opened in a part of the shield ring 12. The structure of this leakage window varies depending on the type of radio waves used, but in normal cases, a slit-shaped window with a portion of the metal wall of the shield ring 12 cut out is preferable. Its dimensions are necessarily determined by the type or wavelength of the radio wave.
シールドリング１２から漏洩した電波は、地［−のモニ
タ一部２４に空間伝送され、受信アンテナ２５を介して
無線受信装置２６によって受信されろ。モニタ一部２４
は、無線受信装置２６のほか、演算処理装置２７及び表
示装置２８を備えており、演算処理装置２７は、無線受
信装置２６の出力信号を解読し、ａｌｌ定された洩れ電
流の値を表示袋Ｕ２８に出力する５、第２図は、シール
ドリング１２の内部構造を更に具体的に示したものであ
る。なお、第１図と同一の部品は等は同一の符号をもっ
て表示しである。The radio waves leaked from the shield ring 12 are spatially transmitted to the monitor part 24 on the ground, and are received by the radio receiving device 26 via the receiving antenna 25. Monitor part 24
In addition to the radio receiving device 26, the processing device 27 is equipped with an arithmetic processing device 27 and a display device 28, and the arithmetic processing device 27 decodes the output signal of the radio receiving device 26 and displays the determined leakage current value. 5 output to U28, FIG. 2 shows the internal structure of the shield ring 12 in more detail. Note that parts that are the same as those in FIG. 1 are designated by the same reference numerals.
シールドリング１２は、ケーブル終端部のブッシング２
９０Ｌ端に被せられ、必要な装置を収納するための空間
を形成する。同空間の−・隅には洩れ電流検出装置１４
が取付けられており、かつ、その上部には高圧接続端子
３０が載置されている。同端子は、直流型１１ｉＸ（図
示せず）の高圧側端子からの高圧線を引き込むためのも
のである。The shield ring 12 is connected to the bushing 2 at the end of the cable.
It is placed over the 90L end to form a space for storing necessary equipment. Leakage current detection device 14 is located in the corner of the same space.
is attached, and a high voltage connection terminal 30 is placed on top of it. This terminal is for drawing in a high voltage line from the high voltage side terminal of the DC type 11iX (not shown).
中央の台上には、信号処理装置１５が載置され、かつ、
その側面には無線送信装置１６が取付けられている。な
お、３０ａ及び３０ｂは、洩れ゛越流検出装置１４と信
号処理装置１５との間を電気的に接続するための導線で
あり、３０ｃは洩れ電流検出装置１４と導体引出棒１９
との間を電気的に接続するための導線である。A signal processing device 15 is placed on the central stand, and
A wireless transmitter 16 is attached to its side. Note that 30a and 30b are conductive wires for electrically connecting between the leakage/overflow detection device 14 and the signal processing device 15, and 30c is a conductor for electrically connecting the leakage current detection device 14 and the conductor pull-out rod 19.
This is a conducting wire for electrically connecting between the
本発明によれば、印加電圧の大きさや雰囲気の状態に関
係なく、極めて安全かつ高精度に電力ケーブルの直流洩
れ電流を測定することができる。According to the present invention, the DC leakage current of a power cable can be measured extremely safely and with high precision, regardless of the magnitude of the applied voltage or the state of the atmosphere.
第１図は９本発明による直流洩れ電流測定方法の一実施
例を示す系統図、第２図は、本発明の方法に使用するケ
ーブル終端部の具体的構造を示す断面図、第３図は従来
の直流洩れ電流測定方法の一例を示す概略図である。
く符号の説明〉
１１・・・被測定ケーブル、１２・・・シールドリング
、１４・・・洩れ電流検出装置、１５・・・信号処理装
置、１６・・無線送（ご装置、２０・・・試験用直流電
源、２３・・・電波漏洩窓、２４・モニタ一部、２６・
・無線受信装置、２７・・演算処理装置、２８・表示装
置。Fig. 1 is a system diagram showing an embodiment of the DC leakage current measuring method according to the present invention, Fig. 2 is a sectional view showing the specific structure of the cable termination used in the method of the present invention, and Fig. 3 is FIG. 2 is a schematic diagram showing an example of a conventional DC leakage current measuring method. Explanation of symbols> 11... Cable to be measured, 12... Shield ring, 14... Leakage current detection device, 15... Signal processing device, 16... Wireless transmission (your device, 20... Test DC power supply, 23... Radio wave leakage window, 24. Part of monitor, 26.
・Radio receiving device, 27. Arithmetic processing device, 28. Display device.
Claims (1)
に洩れ電流検出装置、信号処理装置、無線送信装置、ア
ンテナその他の必要な装置を収納し、洩れ電流検出装置
の出力信号を高周波信号に変換した後、シールドリング
の一部に設けた電波漏洩窓から地上の無線受信装置に空
間伝送することを特徴とする電力ケーブルの直流洩れ電
流測定方法1. House the leakage current detection device, signal processing device, wireless transmitter, antenna, and other necessary devices in the shield ring provided at the end of the cable under test, and convert the output signal of the leakage current detection device into a high-frequency signal. A method for measuring direct current leakage current of a power cable, which is characterized by spatially transmitting the signal to a radio receiving device on the ground through a radio wave leakage window provided in a part of the shield ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008116A JPH03214073A (en) | 1990-01-19 | 1990-01-19 | How to measure DC leakage current of power cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008116A JPH03214073A (en) | 1990-01-19 | 1990-01-19 | How to measure DC leakage current of power cables |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03214073A true JPH03214073A (en) | 1991-09-19 |
Family
ID=11684317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008116A Pending JPH03214073A (en) | 1990-01-19 | 1990-01-19 | How to measure DC leakage current of power cables |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03214073A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013019552A1 (en) * | 2011-07-29 | 2013-02-07 | American Power Conversion Corporation | Systems and methods for current and voltage monitoring |
| CN104062483A (en) * | 2014-07-01 | 2014-09-24 | 杭州意能防雷技术有限公司 | Distributed high voltage cable shielding layer current monitoring system and distributed high voltage cable shielding layer current monitoring method thereof |
| JP2014182014A (en) * | 2013-03-19 | 2014-09-29 | Kyushu Electric Power Co Inc | Method and device for locating high-resistance insulation failure place in power cable |
-
1990
- 1990-01-19 JP JP2008116A patent/JPH03214073A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013019552A1 (en) * | 2011-07-29 | 2013-02-07 | American Power Conversion Corporation | Systems and methods for current and voltage monitoring |
| JP2014182014A (en) * | 2013-03-19 | 2014-09-29 | Kyushu Electric Power Co Inc | Method and device for locating high-resistance insulation failure place in power cable |
| CN104062483A (en) * | 2014-07-01 | 2014-09-24 | 杭州意能防雷技术有限公司 | Distributed high voltage cable shielding layer current monitoring system and distributed high voltage cable shielding layer current monitoring method thereof |
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