WO1997008799A1 - Electrode pour epissures a haute tension - Google Patents

Electrode pour epissures a haute tension Download PDF

Info

Publication number
WO1997008799A1
WO1997008799A1 PCT/US1996/011607 US9611607W WO9708799A1 WO 1997008799 A1 WO1997008799 A1 WO 1997008799A1 US 9611607 W US9611607 W US 9611607W WO 9708799 A1 WO9708799 A1 WO 9708799A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
housing
insulation
undercut
angle
Prior art date
Application number
PCT/US1996/011607
Other languages
English (en)
Inventor
Carl J. Wentzel
William L. Taylor
Original Assignee
Minnesota Mining And Manufacturing Company
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 Minnesota Mining And Manufacturing Company filed Critical Minnesota Mining And Manufacturing Company
Priority to AU64900/96A priority Critical patent/AU6490096A/en
Publication of WO1997008799A1 publication Critical patent/WO1997008799A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/184—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
    • H02G15/103—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress

Definitions

  • the present invention relates to high voltage power cable accessories, particularly cable splices and terminations.
  • a polymeric housing When splicing or terminating high voltage power cables, a polymeric housing is provided to electrically insulate the exposed cable conductor(s) and protect the conductor(s) from the environment.
  • the housing is provided with a semi-conductive or conductive inner electrode which, in the case of splices, spans the bared conductors to contact the cable insulation adjacent the bared conductor of each cable.
  • the highest voltage stresses within the housing typically occur in the vicinity of the ends of this electrode. These stresses must be controlled and limited to prevent premature failure of the splice housing.
  • the present invention controls the voltage stresses at the ends of the electrode by providing a tubular inner electrode having an inner surface adjacent the cable, an outer surface and two ends, the ends being rounded and including at least one undercut extending inwardly from at least one of the ends and from the inner surface to a point intermediate the inner and the outer surface.
  • the undercut may include an angled surface intersecting the rounded end and extending away from the intersection to the inner surface of the electrode.
  • the angled surface is preferably inclined at an angle of 45° with respect to the inner surface of the electrode.
  • the angled surface may be compound to extend in a first surface from the intersection with the rounded surface at a shallower angle, preferably 15°, and a second surface intersecting the first surface and inclined at a preferred angle of 45°.
  • Figure 1 is a cross-sectional view of a splice between two electrical power cables and a housing for the splice area;
  • Figure 2 is an enlarged cross-sectional view of a portion of a splice housing according to the prior art showing a typical failure mode
  • Figure 3 is an enlarged cross-sectional view of a portion of a splice housing according to the invention showing an improved failure mode
  • Figure 4 is an enlarged cross-sectional view of a portion of the inner electrode of the splice housing of the invention of Figure 1 illustrating the electrode in the stretched and contracted states
  • Figure 5 is an enlarged cross-sectional view of a portion of the inner electrode according a second embodiment of the invention.
  • Figure 1 illustrates a splice between two cables 10, and a splice housing, generally indicated as 12, which electrically insulates and shields the cable splice and protects the joint from environmental factors.
  • the housing 12 includes an inner electrode 14 of semi-conductive or conductive polymeric material, polymeric insulation 16 and an outer semi-conductive shield layer 18.
  • the cable 10 includes a central conductor 20, insulation 22 surrounding the conductor 20 and a semi ⁇ conductive shield layer 24 surrounding the insulation 22.
  • the shield layer 24 is stripped back a predetermined length and the insulation 22 is stripped back a lesser predetermined length to expose the conductor 20.
  • the splice housing is positioned up one of the cables 10 and the bared cable conductors 20 are joined by a crimp connector 26. To complete the splice, the housing is positioned to cover the joint as may be seen in Figure 1.
  • the housing inner electrode 14 covers the connector 26 and contacts the cable insulation 22 on either side of the connector 26. Maximum voltage stress is found to occur in the vicinity of the ends of the inner electrode 14. As shown in Figure 2, breakdown of the housing insulation 16 usually occurs adjacent the end of the electrode 14 at air voids or imperfections of the cable insulation 22 or housing insulation 16 and progresses to the outer surface of the housing insulation 16.
  • Figure 3 illustrates a housing electrode 14 modified according to the invention to better control the location of maximum voltage stress and move it up and away from the cable insulation 22 and into the high quality housing insulation 16, thus permitting higher maximum stresses to exist without causing breakdown of the insulation 16.
  • Figure 4 illustrates the shape of the end of the inner electrode 14.
  • the outer shape 28 has an elliptical end and is the configuration of the electrode 14 as molded, which coincides with the relaxed (not stretched) shape of the electrode 14.
  • the inner shape 30 reflects the shape of the electrode 14 when it is . stretched over the splice joint and so enlarged to fit the cable insulation 22.
  • the inner" shape 30 thus illustrates the desired shape of the electrode 14 end when in position to control the location of maximum voltage stress within the housing 12.
  • the rounded end 32 preferably describes the arc of a circle, and the portion adjacent the cable insulation is undercut inwardly from the end and upwardly from the inner surface of the electrode to a point intermediate the inner and outer surfaces of the electrode.
  • the undercut is formed by a flat surface formed at an angle of 45° with respect to the inner surface of the electrode 14, although the angle of the surface relative to the inner surface of the electrode could be as low as 5° or up to 90°.
  • This flat surface joins to a tangent extended from the circular profile of the rounded end 32.
  • the tangential surface can be eliminated if desired and the first surface joined directly to the circular-shaped rounded end 32.
  • Figure 5 illustrates a second embodiment of an electrode 34 wherein the undercut is compound and formed of a first flat surface 36 inclined at an angle of 15° with respect to the inner surface of the electrode 14 and a second flat surface formed at an angle of 45° with respect to the inner surface of the electrode 14.
  • the tangent of the angle formed by the surface of the cable insulation 22 and the inclined flat surface of the electrode 14 end should be at least one for adequate stress control, and preferably is 2.4.
  • the minimum and maximum effective dimensions of the undercut in both the direction normal to the inner surface of the electrode and parallel to the inner surface of the electrode are approximately 0.25 mm and 25 mm, respectively. Smaller undercuts may not be filled with insulation during molding, and larger dimensions may result in thermal problems within the housing.
  • the diametrical dimension of the rounded end preferably ranges from about 0.6 mm to 25 mm.
  • the undercut area need not be formed of flat surfaces and sharp angles.
  • the end of the electrode could have an undercut of smoothly curved and blended surfaces .
  • the invention has been described with respect to a splice connection, other structures such as terminations, elbows or modular connection systems may benefit.
  • the invention has been described with respect to push-on housings, the invention is applicable to heat shrink, resin and cold-shrink types of devices.

Abstract

Cette invention concerne une électrode (14) qui est destinée à un boîtier (12) d'épissure de câble d'alimentation, et dont une extrémité possède une gorge permettant de repositionner le point de tension maximale depuis la surface de l'isolation du câble, en un point se trouvant dans l'isolation du boîtier, ceci de manière à accroître la contrainte pouvant s'exercer avant qu'une rupture d'isolation ne se produise.
PCT/US1996/011607 1995-08-31 1996-07-12 Electrode pour epissures a haute tension WO1997008799A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU64900/96A AU6490096A (en) 1995-08-31 1996-07-12 Electrode for high voltage splices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52188995A 1995-08-31 1995-08-31
US08/521,889 1995-08-31

Publications (1)

Publication Number Publication Date
WO1997008799A1 true WO1997008799A1 (fr) 1997-03-06

Family

ID=24078566

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/011607 WO1997008799A1 (fr) 1995-08-31 1996-07-12 Electrode pour epissures a haute tension

Country Status (2)

Country Link
AU (1) AU6490096A (fr)
WO (1) WO1997008799A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011081273A1 (de) * 2011-08-19 2013-02-21 Tyco Electronics Raychem Gmbh Elektrische Isolierung einer Kabelverbindung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1756080A (en) * 1926-06-01 1930-04-29 Ohio Brass Co Insulated cable joint
GB1142050A (en) * 1965-11-04 1969-02-05 Nl Kabelfabrieken Nv Improvements in or relating to cable joints
US3761602A (en) * 1972-01-12 1973-09-25 Amp Inc Method and connector having conductive elastomeric material encircled by a continuous layer of insulation in intimate contact therewith
FR2394197A1 (fr) * 1977-06-09 1979-01-05 Siemens Ag Manchon de raccordement destine a des cables blindes pour courant fort
DE3043008A1 (de) * 1980-11-11 1982-05-19 Siemens AG, 1000 Berlin und 8000 München Kabelgarnitur mit einem isolierkoerper aus silikonkautschuk
WO1986002210A1 (fr) * 1984-09-28 1986-04-10 Societa, Cavi Pirelli S.P.A. Joint pour cables avec isolation extrudee
WO1990013933A1 (fr) * 1989-05-03 1990-11-15 Nkf Kabel B.V. Connexion enfichable pour cables haute tension plastifies
DE4323762C1 (de) * 1993-07-15 1994-07-21 Felten & Guilleaume Energie Aufschiebbare Verbindungsmuffe für kunststoffisolierte Mittelspannungskabel mit Lichtwellenleitern

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1756080A (en) * 1926-06-01 1930-04-29 Ohio Brass Co Insulated cable joint
GB1142050A (en) * 1965-11-04 1969-02-05 Nl Kabelfabrieken Nv Improvements in or relating to cable joints
US3761602A (en) * 1972-01-12 1973-09-25 Amp Inc Method and connector having conductive elastomeric material encircled by a continuous layer of insulation in intimate contact therewith
FR2394197A1 (fr) * 1977-06-09 1979-01-05 Siemens Ag Manchon de raccordement destine a des cables blindes pour courant fort
DE3043008A1 (de) * 1980-11-11 1982-05-19 Siemens AG, 1000 Berlin und 8000 München Kabelgarnitur mit einem isolierkoerper aus silikonkautschuk
WO1986002210A1 (fr) * 1984-09-28 1986-04-10 Societa, Cavi Pirelli S.P.A. Joint pour cables avec isolation extrudee
WO1990013933A1 (fr) * 1989-05-03 1990-11-15 Nkf Kabel B.V. Connexion enfichable pour cables haute tension plastifies
DE4323762C1 (de) * 1993-07-15 1994-07-21 Felten & Guilleaume Energie Aufschiebbare Verbindungsmuffe für kunststoffisolierte Mittelspannungskabel mit Lichtwellenleitern

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011081273A1 (de) * 2011-08-19 2013-02-21 Tyco Electronics Raychem Gmbh Elektrische Isolierung einer Kabelverbindung

Also Published As

Publication number Publication date
AU6490096A (en) 1997-03-19

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