WO2000042444A9 - Controle des cables electriques et de leurs raccords - Google Patents

Controle des cables electriques et de leurs raccords

Info

Publication number
WO2000042444A9
WO2000042444A9 PCT/US2000/000769 US0000769W WO0042444A9 WO 2000042444 A9 WO2000042444 A9 WO 2000042444A9 US 0000769 W US0000769 W US 0000769W WO 0042444 A9 WO0042444 A9 WO 0042444A9
Authority
WO
WIPO (PCT)
Prior art keywords
cable
joint
electrode
conductor
voltage
Prior art date
Application number
PCT/US2000/000769
Other languages
English (en)
Other versions
WO2000042444A1 (fr
Inventor
Brian Gregory
Andrew Leslie Barclay
Original Assignee
Bicc Gen Uk Cables Ltd
Biccgeneral Cable Ind Inc
Brian Gregory
Andrew Leslie Barclay
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bicc Gen Uk Cables Ltd, Biccgeneral Cable Ind Inc, Brian Gregory, Andrew Leslie Barclay filed Critical Bicc Gen Uk Cables Ltd
Priority to AU27251/00A priority Critical patent/AU2725100A/en
Publication of WO2000042444A1 publication Critical patent/WO2000042444A1/fr
Publication of WO2000042444A9 publication Critical patent/WO2000042444A9/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors

Definitions

  • This invention relates to electrical testing of high- voltage electric cables and cable joints (including terminations) , primarily (but not exclusively) for use in connection with submarine power cables.
  • Such cables have a load-carrying conductor covered with a "semiconducting" conductor screen (or shield) to ensure a smooth equipotential surface for sound contact with surrounding dielectric (insulation) , corresponding semiconducting "dielectric screen” (insulation shield) on the outer surface of the dielectric, a metallic return conductor (or screen) in at least electrical contact with the dielectric screen, and outer protective layers which are immaterial to this invention. Cables with more than one conductor (usually three) are known but are unusual at very high voltages.
  • One of the standard tests for high-voltage cables is a so-called "partial discharge” test in which a test voltage is applied and any local ionisation detected (if possible) by radio-frequency detectors.
  • such tests can be applied from the end of a jointed length of cable, but the attenuation of radio-frequencies along the cable is such that the sensitivity of the test becomes inadequate at the lengths contemplated.
  • the present approach to this problem is to isolate each joint by removing a length of the dielectric screen from the cable on each side of the joint, testing the joint by applying test voltage to the dielectric screen of the joint while earthing (grounding) the cable conductor (and the dielectric screen of the cable) .
  • a method of testing a jointed high-voltage cable comprises establishing a condition in which at least one joint interrupts the metallic return conductor of the cable without interrupting the dielectric screen, test voltage is applied between the cable conductor and return conductor, and an instrument sensitive to frequencies above 2MHz is used to observe whether partial discharges are occurring.
  • the whole of the joint may be left without metallic return conductor during the test.
  • a metallic electrode needs to be provided (or maintained) around the joint area (but spaced sufficiently from the metallic return conductor of the adjacent cable length(s)), and if this is in contact with the dielectric screen it may be considered a return conductor; however, it need not be in contact, but may be capacatively linked with the dielectric screen through a thin insulation layer.
  • the electrode may be provided by a foil, sheet or helically-wound tape of copper, aluminium or other suitable material with adequate conductivity at MHz frequencies. Wire braids or woven or knitted wire fabrics can also be used but may be less desirable as presenting rather greater risk of abrasion.
  • test frequency above 2MHz is sufficient for operation of the invention, we believe that better results are obtained by using even higher frequencies, without limit except practicablity.
  • a practical preferred range is from 30 to 500MHz.
  • the preferred connection of the test voltage is such that the cable conductor is at high voltage and the dielectric screen and return conductor earthed, so the complication and delay required for reversing connections is avoided, together with the need to provide high-voltage insulation between the joint screen and external earth and high-voltage protection for personnel and instruments in the joint region; further it is possible, when a joint has been made at sea (for instance a repair joint) to apply the method with the high voltage for the test applied to the cable at a termination on land. Increased sensitivity can be obtained, in some instances, by exposing the joint region (or selected parts of it, with a view to tracing location of detected faults) to high-energy (ionising) radiation during test.
  • the joint area should preferably be screened by an earthed metallic enclosure to minimise external noise during testing.
  • Figure 1 is a diagrammatic, partly sectioned, view of a cable joint being tested by the method of this invention.
  • the joint shown in the figure is formed between two lengths of cross-linked polyethylene-insulated high-voltage power cables 1 and 2 of the kind described.
  • the load-carrying conductor, semiconductive conductor screen and dielectric are connected and reinstated in a conventional manner, and are not visible in the drawing because they are concealed within reinstated semiconductive dielectric screen 3 which is continuous from one length of the cable to the other.
  • the metallic return conductor 4 remains exposed for a short length at each end by cutting back of outer layers represented diagrammatically at 5.
  • a protective layer 6 of polyethylene sheet is optionally applied to the joint region, which is then formed with a tubular electrode 7 by wrapping with thin copper tape.
  • a radio-frequency detector 8 is connected between the electrode 7 and the return conductor 4 of one of the cable lengths (or an alternative earth point) and is conventional except that it is tuned to accept only signals in the approximate range 30-500 MHz.
  • An earth screen 10 encloses the joint area, and preferably the instrumentation, to protect from external interference; as is well known, it needs to be well bonded to both the return conductors 4 all round their circumferences. Test voltage is applied, in an entirely conventional way at one end of the cable, using a temporary termination at each end.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

L'invention concerne un procédé permettant de contrôler un câble haute tension comprenant des raccords. Ce procédé comprend les étapes suivantes :on établit une condition dans laquelle au moins un raccord interrompt le conducteur métallique de retour du câble sans interrompre le blindage (3) diélectrique. On applique une tension d'essai entre le conducteur et le conducteur (4) de retour du câble, et on utilise un instrument (8) sensible aux fréquences supérieures à 2MHz pour vérifier si des décharges partielles se produisent. Ce procédé repose sur le fait que le blindage diélectrique semiconducteur est pratiquement isolant à ces fréquences et permet d'éviter le démontage des bandes de blindage diélectrique (et leur remontage subséquent en l'absence moyens permettant de vérifier la qualité du remontage). On contrôle les raccords du câble en appliquant une électrode (7) métallique autour de la région du raccord (en prenant garde de l'espacer suffisamment du conducteur métallique de retour de la section ou des sections de câble adjacente(s)) et en branchant l'instrument de vérification H.F. entre cette électrode et la terre.
PCT/US2000/000769 1999-01-14 2000-01-13 Controle des cables electriques et de leurs raccords WO2000042444A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27251/00A AU2725100A (en) 1999-01-14 2000-01-13 Testing electric cables and their joints

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9900820.3A GB9900820D0 (en) 1999-01-14 1999-01-14 Testing cables and their joints
GB9900820.3 1999-01-14

Publications (2)

Publication Number Publication Date
WO2000042444A1 WO2000042444A1 (fr) 2000-07-20
WO2000042444A9 true WO2000042444A9 (fr) 2002-06-27

Family

ID=10845943

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/000769 WO2000042444A1 (fr) 1999-01-14 2000-01-13 Controle des cables electriques et de leurs raccords

Country Status (3)

Country Link
AU (1) AU2725100A (fr)
GB (1) GB9900820D0 (fr)
WO (1) WO2000042444A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105445604A (zh) * 2015-11-06 2016-03-30 上海斐讯数据通信技术有限公司 一种usb3.1type-c型线缆自动测试方法

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004099800A2 (fr) * 2003-05-09 2004-11-18 Siemens Aktiengesellschaft Dispositif de mesure et procede de localisation d'une decharge partielle
DE102009043339B4 (de) 2009-05-26 2013-06-13 Nkt Cables Gmbh Prüfverfahren und Anordnung zur Messung von Teilentladungen an einem Einleiterseekabelspleiß
US8237427B2 (en) 2009-06-16 2012-08-07 Textron Innovations Inc. Wideband high impedance bridging module
JP5795470B2 (ja) * 2010-11-02 2015-10-14 矢崎総業株式会社 高電圧試験装置
GB2531325A (en) * 2014-10-16 2016-04-20 Repl Internat Ltd Medium-Voltage cable joint
CN105548790B (zh) * 2015-12-09 2019-08-16 上海斐讯数据通信技术有限公司 一种USB3.1 Type-C线缆自动测试方法及系统
US11567146B2 (en) 2018-09-10 2023-01-31 3M Innovative Properties Company Electrical power cable monitoring device using low side electrode and earth ground separation
EP3850718A1 (fr) * 2018-09-10 2021-07-21 3M Innovative Properties Company Structure de support pour câble et dispositifs de surveillance d'état d'accessoire de câble
US11604218B2 (en) 2018-09-10 2023-03-14 3M Innovative Properties Company Electrical power cable monitoring device including partial discharge sensor
CN115151829A (zh) 2019-12-31 2022-10-04 3M创新有限公司 本地局部放电监测

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2008898C (fr) * 1989-10-25 1998-11-24 Takeshi Endoh Methode de detection d'une decharge partielle dans l'isolant d'un appareil generateur d'energie
NL9201944A (nl) * 1992-11-05 1994-06-01 Kema Nv Werkwijze voor het meten van partiële ontladingen in kabels.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105445604A (zh) * 2015-11-06 2016-03-30 上海斐讯数据通信技术有限公司 一种usb3.1type-c型线缆自动测试方法

Also Published As

Publication number Publication date
GB9900820D0 (en) 1999-03-03
AU2725100A (en) 2000-08-01
WO2000042444A1 (fr) 2000-07-20

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