EP0067568B1 - Dispositif destiné à tester des câbles à très haute tension - Google Patents

Dispositif destiné à tester des câbles à très haute tension Download PDF

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Publication number
EP0067568B1
EP0067568B1 EP82302671A EP82302671A EP0067568B1 EP 0067568 B1 EP0067568 B1 EP 0067568B1 EP 82302671 A EP82302671 A EP 82302671A EP 82302671 A EP82302671 A EP 82302671A EP 0067568 B1 EP0067568 B1 EP 0067568B1
Authority
EP
European Patent Office
Prior art keywords
housing
fluid
cable
pipe
flange
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
Application number
EP82302671A
Other languages
German (de)
English (en)
Other versions
EP0067568A3 (en
EP0067568A2 (fr
Inventor
Gunnar Rekdal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent NV
Original Assignee
Alcatel NV
International Standard Electric Corp
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 Alcatel NV, International Standard Electric Corp filed Critical Alcatel NV
Publication of EP0067568A2 publication Critical patent/EP0067568A2/fr
Publication of EP0067568A3 publication Critical patent/EP0067568A3/en
Application granted granted Critical
Publication of EP0067568B1 publication Critical patent/EP0067568B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/54—Insulators or insulating bodies characterised by their form having heating or cooling devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/34—Insulators containing liquid, e.g. oil

Definitions

  • the present invention relates to apparatus for testing very high voltage power cables.
  • a solution is sought in GB-A-1 068 219 by providing a semiconducting tape wound around an insulator at its surface, primarily to avoid corrosion at the surface.
  • Another proposal is to introduce semiconducting layers at locations to thereby reduce electrical stress.
  • the cable end must be extremely straight and it may not be moved after tape is applied, as this would result in internal tape movements which would make the termination inferior. Therefore the cable end has to be arranged at its final test position before the condensor tape is applied and the cable end also has to be positioned exactly at the test location.
  • a scaffold must be built up around it, and the cable end must be prepared by dismantling and stripping. Then the insulator has to be built up around the exposed cable core and workers have to stand on the scaffold in awkward working positions. To prepare one cable end for testing requires approximately 2 men for 2 weeks and during all this time the test equipment is dedicated to the cable.
  • the problems may differ according to the cable types which are to be tested, but the example above is realistic when a power DC cable with oil insulated paper and an outer lead sheath is concerned.
  • GB-A-893376 discloses an improved test apparatus for high voltage cables up to 132 kV.
  • the described apparatus is relatively simple in that it includes premade stress cones and connectors into which a cable core may be inserted. This type of test apparatus is, however, not considered to be useful for testing very high voltage cables.
  • the present invention seeks to provide a test apparatus which is applicable for very high DC voltages, say up to 2 MV, which is easy to install, which gives a good control over the voltage distribution (electrically speaking an extremely “stiff" insulator), and which is easily adaptable to different types of cables.
  • an apparatus for testing very high voltage electric cables including a hollow dielectric housing for containing an insulating fluid, the housing having an entrance at one end for receiving a cable core, electrically conductive means, such as a flange, to permit termination of the cable sheath or screen at the housing entrance with the cable inserted into the housing and electrically conductive means, such as a flange, at the end of the housing remote from the entrance to permit connection to the cable conductor, characterised in that the housing contains at least one semiconducting element formed by a fluid filled tube or pipe within the housing which effect electrical interconnection between the flange means and a passage in at least one of the flange means which communicates with the tube(s) or pipe(s) and permits connection to an external heat exchanger.
  • the fluid filled tube(s) or pipe(s) are formed of an insulating material and contain a semiconducting fluid.
  • the fluid may be de-ionised water.
  • the fluid in the tubes or pipes is circulated in a closed system incorporating heat exchange and pump means.
  • the test apparatus includes an outer insulated housing 22 having two flanges 23 and 24 and one or more insulated tubes 25 for highly resistive sometimes called (semiconducting) fluid.
  • the cable end is inserted into the insulator housing arrangement 22, so that the sheath/screen end 28 becomes aligned with the lower flange 23 and the core end becomes aligned with the upperflange 24.
  • the lowerflange 23 is then secured and sealed to the outer sheath/ screen of the cable at the end 28, and also to the semiconducting tape winding 27. If an oil filled cable is employed, the oil channel 31 is connected to an oil reservoir to feed the cable end with oil.
  • the insulator is brought into correct test position by lifting and tilting as shown in Figure 2.
  • the interior 18 of the housing 22 is filled with a suitable insulating fluid.
  • Silicone oil is preferred due to its non-flammability.
  • SF 6 gas may also be used as a practical fluid.
  • the tubes 25 are filled with a high resistance agent. Purified and de-ionised water is preferred.
  • the tubes 25 may be connected to an externally arranged unit 50, Figure 2 for circulating the water (via a pump), to cool the water (by means of a heat exchanger) and for de-ionising the water in a de-ioniser.
  • This external unit does not in itself represent a part of the invention. It may be manually controlled or automatically monitored. Parameters which may be changed or monitored are velocity of resistive agent, quality of resistive agent etc. In a prototype the following values were used: 6 pipes with internal diameter of 13 mm (p were guiding de-ionised water. The pump was circulating approx. 10 I/min. The test voltage applied was 1,5 MV. A conventional ion- exchanger was used.
  • the insulating fluid may also be circulated and its quality may be monitored.
  • connection to high test voltages finally is obtained in a conventional manner, and by using a screen in the form of a conducting toroid 33 to reduce corona.
  • the mounting of the test apparatus may be completed in a few hours. If the cable end together with the insulator is arranged on a carriage with adjustable height and adjustable tilting, a very convenient plant is obtained.
  • a branched tube 32 is an input manifold for a high resistive fluid which passes through the tube(s) 25 (preferably three parallel tubes) to an upper manifold section 36 within the flange 24.
  • the fluid is distributed and passed back to the lower flange 23 through the uppertube(s) 25 (preferably also three parallel tubes).
  • the high resistive fluid leaves the housing through a manifold 40, and passes to an external pump, de-ioniser and purifier unit (50, Figure 2).
  • Distance rings 41, 42 are arranged at intervals to keep the tube(s) 25 in position.
  • the manifolds 32, 36, 40 are made from metal and the fluid has direct contact with their internal walls.
  • the manifolds also are electrically connected to the flanges 23, 24.
  • the cable end with the test apparatus is arranged on an adjustable framework 43.
  • the mounting is undertaken when the cable end is in its lower position, and when testing is to be undertaken the framework lifts and tilts the cable end to its upper position.
  • a test termination as a rule is arranged at indoor locations where the different parameters are easy to adjust.
  • some embodiments of this invention may also be suited for field application.
  • the resistivity By adjusting the temperature of the de-ionised water, the resistivity also is adjusted.
  • the pipe dimensions may, however, also be altered to adapt the test termination to other voltages.
  • the insulating parts of the test apparatus may, if desired, be built up from transparent materials so that the interior of the insulator may be visually supervised during the process.
  • Distance rings 41, 42 as shown in Figure 1 are only necessary when the stripped cable core portion has to be long due to high test voltages.
  • the strings or streams of high resistive fluid should be guided substantially parallel with the conductor in the interior of the insulator housing.
  • the highly resistive fluid may circulate internally in a closed tube system, either due to thermal changes or due to an active pump. However, the fluid may also flow through the system without circulating.
  • the number of the tubes or pipes with highly resistive fluid is not critical. It is assumed that the distance between two adjacent tubes preferably should be inversely proportioned to the electrical field strength. In the shown cable test application the distance is constant as the field strength is constant in each cross-section.
  • the conductivity may be adjusted by adding different additives, or by adjusting the temperature.
  • the same dimensions may be used in the equipment for rather different voltages.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Testing Relating To Insulation (AREA)
  • Steroid Compounds (AREA)

Claims (8)

1. Dispositif de test de câbles électriques à très haute tension comprenant un boîtier diélectrique creux (22) pour contenir un fluide isolant (18), ce boîtier ayant une entrée à une extrémité pour recevoir l'âme d'un câble (20), des moyens conducteurs de l'électricité (23), tels qu'un fiasque, pour permettre la terminaison de l'armure ou du blindage du câble sur l'entrée du boîtier alors que le câble est inséré dans le boîtier (22), ainsi que des moyens conducteurs de l'électricité (24), tels qu'un flasque, à l'extrémité du boîtier éloignée de l'entrée, pour permettre le raccordement d'un conducteur de câble (30), caractérisé en ce que le boîtier (22) contient au moins un élément semiconducteur formé par un tuyau ou tube (25) rempli de fluide à l'intérieur du boîtier, qui réalise l'interconnexion électrique entre lesdits flasques (23 et 24), ainsi qu'un passage dans au moins l'un des flasques, communiquant avec le tuyau ou tube (25) et permettant la connexion avec un échangeur de chaleur externe.
2. Dispositif selon la revendication 1, caractérisé en ce que le(s) tuyau(x) ou tube(s) rempli(s) de fluide (25) est (sont) formé(s) d'un matériau isolant et empli(s) d'un fluide semi-conducteur.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le fluide contenu dans le(s) tuyau(x) est de l'eau désionisée.
4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que des moyens (32, 36, 40) sont prévus pour faire circuler le fluide à travers le(s) tuyau(x) ou tube(s) (25) et les flasques (23, 24).
5. Dispositif selon la revendication 4, caractérisé en ce que le fluide contenu dans le(s) tuyau(x) ou tube(s) circule dans un système fermé incluant l'échangeur de chaleur et des moyens de pompe (50).
6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend au moins deux tuyaux ou tubes (25) et en ce que le flasque (23) connecté à l'armure ou au blindage (21) du câble comprend une (des) entrée(s) ainsi qu'une (des) sortie(s) (40) de circulation de fluide.
7. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu de multiples éléments semi-conducteurs répartis régulièrement à l'intérieur du boîtier.
8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'avant de remplir le boîtier (22) d'un fluide isolant et avant l'insertion de l'âme de câble (19), armure ou blindage retiré, tout au long du boîtier, l'âme du câble est pourvue d'une pièce d'étanchéité (26) telle qu'un manchon thermo-rétractable.
EP82302671A 1981-05-26 1982-05-25 Dispositif destiné à tester des câbles à très haute tension Expired EP0067568B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO811769A NO149229C (no) 1981-05-26 1981-05-26 Hoeyspenningsisolasjon.
NO811769 1981-05-26

Publications (3)

Publication Number Publication Date
EP0067568A2 EP0067568A2 (fr) 1982-12-22
EP0067568A3 EP0067568A3 (en) 1984-01-04
EP0067568B1 true EP0067568B1 (fr) 1987-03-11

Family

ID=19886090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82302671A Expired EP0067568B1 (fr) 1981-05-26 1982-05-25 Dispositif destiné à tester des câbles à très haute tension

Country Status (2)

Country Link
EP (1) EP0067568B1 (fr)
NO (1) NO149229C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103456436A (zh) * 2013-08-30 2013-12-18 韩汶冀 绝缘子绝缘性能保护装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH685078A5 (de) * 1992-06-15 1995-03-15 Hubbell Inc Isolator mit innerer Durchführung.
NO337675B1 (no) * 2014-09-26 2016-06-06 Nexans Vannterminering for kabeltest

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB371471A (en) * 1931-01-28 1932-04-28 Ohio Brass Co Improvements in high voltage systems
US1983371A (en) * 1934-06-23 1934-12-04 Ohio Brass Co Temperature control for oil filled bushings
GB758298A (en) * 1954-09-01 1956-10-03 Taylor Tunnicliff & Co Ltd Improvements in electric insulators
GB893376A (en) * 1959-10-26 1962-04-11 British Insulated Callenders Improvements in and relating to the testing of high voltage electric cables
CH387724A (fr) * 1963-01-29 1965-02-15 Emile Haefely & Cie S A Isolateur de traversée à haute tension pour courants à trés forte intensité
US3548070A (en) * 1969-05-06 1970-12-15 Chance Co Ab Pothead with pressurized dielectric
US3634784A (en) * 1970-05-27 1972-01-11 Bird Electronic Corp Fluid-cooled coaxial line terminator
DE2210289A1 (de) * 1972-02-29 1973-09-20 Siemens Ag Gekuehlter endverschluss fuer hochspannungskabel
FR2446022A1 (fr) * 1978-07-19 1980-08-01 Mars Actel Extremite de cable electrique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103456436A (zh) * 2013-08-30 2013-12-18 韩汶冀 绝缘子绝缘性能保护装置

Also Published As

Publication number Publication date
NO149229B (no) 1983-11-28
EP0067568A3 (en) 1984-01-04
NO811769L (no) 1982-11-29
NO149229C (no) 1984-03-07
EP0067568A2 (fr) 1982-12-22

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