EP0067568A2 - Dispositif destiné à tester des câbles à très haute tension - Google Patents

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

Info

Publication number: EP0067568A2
Authority: EP; European Patent Office
Prior art keywords: high voltage; fluid; insulating; semiconducting; insulating body
Prior art date: 1981-05-26
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

Application number

EP82302671A

Other languages

German (de)

English (en)

Other versions

EP0067568A3 (en

EP0067568B1 (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.)

1981-05-26

Filing date

1982-05-25

Publication date

1982-12-22

1982-05-25 Application filed by Alcatel NV, International Standard Electric Corp filed Critical Alcatel NV

1982-12-22 Publication of EP0067568A2 publication Critical patent/EP0067568A2/fr

1984-01-04 Publication of EP0067568A3 publication Critical patent/EP0067568A3/en

1987-03-11 Application granted granted Critical

1987-03-11 Publication of EP0067568B1 publication Critical patent/EP0067568B1/fr

Status Expired legal-status Critical Current

Links

Images

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

This invention relates to a high voltage insulator designed to obtain an even distribution of the electrical field between at least two conductors with different electrical potentials, and in particular to a high voltage insulator designed to be used as a test termination equipment for a high voltage power cable.
the very first approach when two conducting elements having different electrical potentials are to be mutually insulated is simply to arrange an insulator therebetween.
the material in this insulator should have as perfect insulating properties as possible.
the cable end must be extremely straight. 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 condenser tape is applied and the cable end has also 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 the 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. During all this time the test plant is occupied by 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.
the object of the present invention is, therefore, to provide an insulator which is applicable to extremely 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 insulating purposes e.g. to different types of cables.
a high voltage insulator designed to obtain an even distribution of the electric field between at least two conductors with different electrical potentials, which insulator comprises at least two different components, namely a substantially ideal insulating body and at least one highly resistive (also called semiconducting) element having a small cross-sectional area, these components being connected to the conductors, characterised in that the insulating body and/or the semiconducting element(s) comprise(s) a fluid (liquid or gas) which enhances the conduction of heat from the semiconducting element(s).
an insulator according to the present invention By using an insulator according to the present invention there is obtained: a very good, smooth and controllable voltage distribution over the insulator, a smooth and easily controllable temperature surveillance, an easy-to-mount and easy-to-adapt insulator, a new design which may be used at much higher voltages than present solutions, as generated heat may be conducted out of the system.
Fig. 1, 1 and 2 are two electrical conductors having different potentials, here denoted as + and -. These are only to be understood as relative values, as one of the conductors may be grounded, The distance L between the conductors must of course be so large that a direct flash-over through the ambient medium is avoided,
Each of the conductors is connected to a connecting member 3 and 4.
These connecting members are good conductors, preferably of metals as copper, aluminium or the like. They are here shown with a smooth, rounded off surface to prevent corona,
an insulator 5 Between the connecting members is arranged an insulator 5 according to the present invention.
the insulator comprises two different portions, the insulating body 6 and the high resistance path(s) 7 embedded therein. If the high resistance path(s) was (were) not included, the electrical field would have a random distribution caused by occasional disturbances. When the high resistance path(s) is (are) included this (they) will, however, ensure an even field distribution along the insulator. This is shown in Fig. 1 A.
both the insulating body and the high resistance path(s) (one or several) is made of a solid material, it is necessary to let the insulator be cooled by an outside agent, which may e.g. be water in a cooling hood (not shown) or simply ambient air flowing alongside the insulator's surface. This is, of course, known technique.
the insulating body 6 consists of a fluid (enclosed in an insulating housing) while the high resistance path(s) 7 is (are) built up from solid matter, e.g. thin metallic wires or a metallic substrate on the inner surface of the insulating housing, then the cooling may be effected by the insulating fluid itself.
the insulating fluid may even circulate through an externally arranged heat exchanger.
the insulating body may be made from a solid matter while the high resistance path may consist of a fluid. It will be self- explanatory how the insulator then acts.
both the insulating body and the high resistive path material may be fluids.
One or both may then be active as cooling mediums, either in a system with no external circulation, that is with only heat exchange and dissipation, in the Fig. 1 embodiment, or with a system in which at least one of the mediums is circulated, possibly through an externally arranged heat exchanger.
This is shown in the figure 2 (only insulating fluid circulates to the external cooling device), Fig. 3 (only high-resistive fluid circulates to the external cooler and deionizer), and Fig. 4 (both fluids circulate).
the tubes 9 may preferably be of insulating material, but they may then preferably be broken at the point of intrusion into the connecting members 3 and 4. Thus the high resistance fluid will be in direct electrical contact with the conductors 1 and 2.
an insulator according to these principles is to be used in a testing equipment for high voltage power cables having an outer screen, it may be built up as shown in Fig. 5.
the cable 20 shown in this figure may be a single conductor power cable for DC, e.g. with an impervious sheath 21 of Al or Pb. This metal sheath 21 is stripped off for a length L of the cable core, which length depends on the test voltage applied as mentioned in connection with Fig.l.The exposed cable core is then brought into the tube shaped insulator 22 according to this embodiment.
the insulator comprises: an outer insulating housing 22, a lower flange 23, an upper flange 24, insulating tubes 25 for a highly resistive fluid.
the cable end is quite simply brought into the insulator arrangement, so deeply that the screen end becomes aligned with the lower flange 23 and the core end becomes aligned with the upper flange 24, Then the lower flange 23 is secured in a sealing manner to the outer screen of the cable at 28, and also to the semiconducting tape winding 27, e.g. by means of a shrinkable sleeve 29.
the cable conductor 30 is secured to the upper flange 24, and the semiconducting windings 27 as well. If an oil-filled cable is considered, the oil channel 31 is connected to an oil chamber to feed the cable end with oil.
the insulator is brought into correct test position by lifting and tilting.
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-ionized water is preferred.
the tubes 25 may be connected to an externally arranged unit 50, Fig. 6 for circulating the water (via a pump) to cool the water (by means of a heat exchanger) and for de-ionizing the water in a de-ionizer.
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, temperature of resistive agent, quality of resistive agent etc. In a prototype, the following values were used; 6 pipes with internal diameter of 13 mm 0 were guiding de-ionized water.
the pump was circulating approx. 10 1/min.
the test voltage applied was 1,5 MV.
a conventional ion-exchanger was used,
the insulating agent may also be circulated or its quality may be monitored, But in this preferred embodiment the insulating agent is not circulating.
connection to high test voltages is finally obtained in a conventional manner, e.g. screened by a conducting toroid 33 to reduce corona.
the mounting of a test arrangement according to the present invention may easily be finished in a few hours, and it may be undertaken in a corner of the test site. 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.
Fig. 5 some further details of the insulator are shown.
the branched tube 32 is an input manifold for the high-resistive fluid which passes through the tube(s) 25(preferably three parallel tubes) up to an upper manifold section 36.
the fluid is distributed and passes back to the lower flange 23 through the upper tube(s) 25 (preferably also three parallel tubes).
the high resistance fluid leaves the insulator through manifold 40, and passes to an external pump, de-ionizer and purifier unit (50, Fig. 6).
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 thus the fluid has direct contact with their internal walls.
the manifolds are also electrically connected to the flanges (23, 24, Fig. 5),
Fig. 6 the cable end with an insulator box according to this invention 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 in which the test is undertaken,
test termination is easy to mount/demount and easy to adjust to different test parameters.
a test termination is arranged as a rule 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 is also adjusted. But the pipe dimensions may also be altered to adapt the test termination to other voltages.
the insulating device may, if desired, be built up from transparent materials and thus the interior of the insulator may be visually supervised during the process.
Distance rings 41, 42 as shown in Fig. 5, are not always necessary, only if the stripped cable core portion has to be extremely long due to high test voltages.
other solutions may be used as well, e.g. a hollow, double walled sheath or the like.
the only essential factor is that strings or streams of highly resistive fluid are guided alongside the conductor in the interior of the insulator.
the highly resistive fluid may only circulate internally in a closed tube system, either due to thermal changes or due to an active pump. However, the fluid may also only flow through the system to an exhaust output.
the number of the tubes or pipes with highly resistive fluid is not critical. It is assumed that the distance between two adjacent tubes should preferably be inversely proportioned to the electrical field strength. In the shown cable test application therefore 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)

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 true EP0067568A2 (fr)	1982-12-22
EP0067568A3 EP0067568A3 (en)	1984-01-04
EP0067568B1 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 (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2692399A1 (fr) *	1992-06-15	1993-12-17	Hubbell Inc	Isolateur pour transport de fluide de refroidissement.
NO337675B1 (no) *	2014-09-26	2016-06-06	Nexans	Vannterminering for kabeltest

Families Citing this family (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

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

1981
- 1981-05-26 NO NO811769A patent/NO149229C/no unknown
1982
- 1982-05-25 EP EP82302671A patent/EP0067568B1/fr not_active Expired

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2692399A1 (fr) *	1992-06-15	1993-12-17	Hubbell Inc	Isolateur pour transport de fluide de refroidissement.
DE4319682A1 (de) *	1992-06-15	1994-01-13	Hubbell Inc	Isolator mit internem Verbindungskanal
US5637827A (en) *	1992-06-15	1997-06-10	Hubbell Incorporated	Insulator with internal passageway
NO337675B1 (no) *	2014-09-26	2016-06-06	Nexans	Vannterminering for kabeltest

Also Published As

Publication number	Publication date
NO149229B (no)	1983-11-28
EP0067568A3 (en)	1984-01-04
EP0067568B1 (fr)	1987-03-11
NO811769L (no)	1982-11-29
NO149229C (no)	1984-03-07

Legal Events

Date	Code	Title	Description
1982-10-22	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1982-12-22	AK	Designated contracting states	Designated state(s): CH FR GB IT LI SE
1983-04-13	17P	Request for examination filed	Effective date: 19830126
1983-11-04	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
1984-01-04	AK	Designated contracting states	Designated state(s): CH FR GB IT LI SE
1987-01-24	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1987-03-11	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): CH FR GB IT LI SE
1987-03-23	ITF	It: translation for a ep patent filed
1987-07-10	ET	Fr: translation filed
1987-09-11	REG	Reference to a national code	Ref country code: FR Ref legal event code: TP
1988-01-19	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1988-01-19	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1988-02-03	RAP2	Party data changed (patent owner data changed or rights of a patent transferred)	Owner name: ALCATEL N.V.
1988-03-09	26N	No opposition filed
1988-07-14	ITPR	It: changes in ownership of a european patent	Owner name: CESSIONE;ALCATEL N.V.
1989-03-29	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: SE Payment date: 19890329 Year of fee payment: 8
1989-05-25	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: GB Effective date: 19890525
1989-05-30	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FR Payment date: 19890530 Year of fee payment: 8
1989-05-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: LI Effective date: 19890531 Ref country code: CH Effective date: 19890531
1990-01-24	GBPC	Gb: european patent ceased through non-payment of renewal fee
1990-01-31	REG	Reference to a national code	Ref country code: CH Ref legal event code: PL
1990-05-26	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: SE Effective date: 19900526
1991-01-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FR Effective date: 19910131
1991-04-05	REG	Reference to a national code	Ref country code: FR Ref legal event code: ST
1995-01-31	EUG	Se: european patent has lapsed	Ref document number: 82302671.1 Effective date: 19910115

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