US3634603A - Electric cable insulating housing filled with high-resistance material - Google Patents

Electric cable insulating housing filled with high-resistance material Download PDF

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Publication number
US3634603A
US3634603A US43000A US3634603DA US3634603A US 3634603 A US3634603 A US 3634603A US 43000 A US43000 A US 43000A US 3634603D A US3634603D A US 3634603DA US 3634603 A US3634603 A US 3634603A
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US
United States
Prior art keywords
cable
housing
medium
resistance
lead
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 - Lifetime
Application number
US43000A
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English (en)
Inventor
Petrus A C Bentvelsen
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.)
NKF Kabel BV
NKF Kabel NV
Original Assignee
NKF Kabel BV
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 NKF Kabel BV filed Critical NKF Kabel BV
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Publication of US3634603A publication Critical patent/US3634603A/en
Anticipated expiration legal-status Critical
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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
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures

Definitions

  • ABSTRACT An electric cable accesso 74475 D filled wlth an insulating medium of a lnt. l-l02g /02 FieldofSearch...........................................
  • This invention relates to an electrical cable accessory which includes spaced-apart contact means for respectively making contact with the cable ground and conductor wires, the contact means being separated from each other by a porcelain body which in turn is filled with a powdered insulating medium.
  • the known cable terminal is provided with a porcelain casing, closed at the bottom by a metal grounding plate, through which the cable enters into the terminal.
  • the metal grounding sheath of said cable is electrically connected to said grounding plate and the porcelain casing is closed at its top by a metal cover, through which extends a terminal member to which the conductor wire of the cable is connected.
  • the conductive sheath of the cable is stripped off partially and a socalled stress cone is connected to the cut edge of said conductive sheath having the function to decrease the voltage gradients at the cut edge.
  • the porcelain casing is filled with insulating oil.
  • An object of this invention is to eliminate these disadvantages and provide a terminal which is characterized in that the insulating medium is a powdered material having such a voltagedependent resistance characteristic, that its specific resistance decreases with increasing voltage, so that the insulating medium has also a field-controlling effect.
  • the insulating medium because of its voltage-dependent resistance (VDR) character, becomes more conductive at a point at which the voltage gradient reaches a predetermined value, whereby the path of the electric field lines is changed and the voltage gradient is decreased.
  • VDR voltage-dependent resistance
  • the stress cone may be omitted completely or be substituted by a stress cone of more simple design than heretofore known.
  • the normal stress cone in which case the advantage is achieved, that no oil filling operating is necessary anymore.
  • the inventive medium is preferably SiC powder.
  • An alternative, boron oxide powder may be used, but this material is more expensive than SiC powder.
  • the apparatus according to the invention is preferably provided with a pressure mechanism, with which the powder is kept under pressure.
  • the apparatus according to the present invention is suitable both for paper cable and for plastic cable.
  • the cable terminal as shown includes a porcelain casing l, which at its bottom has a metal lead through grounding plate 2.
  • the cable 3 enters the cable terminal through said leadthrough plate 2 and the conductive sheath 4 of the cable 3 is connected to the grounding plate 2 at 5.
  • terminal member 7 makes contact with the conductor 9 of the cable through connector 8.
  • a stress cap 10 is arranged about the cover 6 for preventing corona discharges at the top of the cable terminal.
  • the insulation 11 of the cable 3 is cut away just beneath the connector 8.
  • the terminal member 7 may be connected to a cable of an overhead highvoltage line or high-voltage station.
  • the porcelain casing l is filled with SiC powder 12, which is preferably kept under pressure by means of a press plate 13, which is biased downwardly with respect to the cover 6 by means of a pressure spring 14.
  • the invention is not restricted to cable terminals but may be applied to any accessory, in which there are a fluid-insulating medium and a fieldcontrol means, such as a cable joint or cable inlet.
  • a cable accessory comprising a housing of insulating material, lead-through means secured to said housing for introducing at least one cable having a conductive sheath into said housing, the conductive sheath of said cable being sealed against and electrically connected to said lead-through means, and a connector means connected to the conductor of said cable, said housing being filled with a high-resistance medium, wherein said high-resistance medium comprises a powdered material having a voltage-dependent resistance characteristic such that its specific resistance decreases with increasing voltage, whereby said medium has a field-controlling effect.
  • Tire accessory according to claim 1 further comprising means maintaining said powder in a compressed condition.
  • a cable accessory comprising: a housing of an insulating material; lead-through means being secured to said housing for introducing at least one cable into said housing; said cable having a conductive sheath and a conductive member, said sheath being sealed against and electrically connected to said lead-through means; said housing having a connector extending externally of said housing; means electrically connecting said externally extending connector with said conductive member internally of said housing; a high-resistance medium surrounding said cable, said housing being filled with said high-resistance medium, wherein said high-resistance medium comprises a powdered material having a voltage-dependent resistance characteristic such that its specific resistance decreases with increasing voltage, whereby said medium has a field-controlling efi'ect.

Landscapes

  • Cable Accessories (AREA)
  • Insulated Conductors (AREA)
  • Toys (AREA)
US43000A 1969-06-17 1970-06-03 Electric cable insulating housing filled with high-resistance material Expired - Lifetime US3634603A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6909217A NL6909217A (nl) 1969-06-17 1969-06-17

Publications (1)

Publication Number Publication Date
US3634603A true US3634603A (en) 1972-01-11

Family

ID=19807217

Family Applications (1)

Application Number Title Priority Date Filing Date
US43000A Expired - Lifetime US3634603A (en) 1969-06-17 1970-06-03 Electric cable insulating housing filled with high-resistance material

Country Status (6)

Country Link
US (1) US3634603A (nl)
BE (1) BE752118A (nl)
FR (1) FR2052746A5 (nl)
GB (1) GB1292694A (nl)
NL (1) NL6909217A (nl)
SE (1) SE377742B (nl)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2445660A1 (de) * 1973-10-04 1975-04-17 Nkf Kabel Bv Elektrisches hochspannungskabel
GB2222323A (en) * 1988-08-22 1990-02-28 Hubbell Inc Sealed electrical cable connector for use in oil wells
WO2013076038A3 (en) * 2011-11-23 2013-10-17 Tyco Electronics Raychem Gmbh Cover assemblies for electrical cables and methods and kits including same
US20170093143A1 (en) * 2014-02-19 2017-03-30 Abb Schweiz Ag Power Cable Termination Device For Gas-Insulated Switchgear

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US493314A (en) * 1893-03-14 Lightning-arrester
US1159205A (en) * 1914-05-15 1915-11-02 Gen Electric Protective device.
US1935820A (en) * 1931-04-28 1933-11-21 Int Standard Electric Corp High tension cable terminal and joint
US2866135A (en) * 1954-12-15 1958-12-23 Mc Graw Edison Co Lightning arresters
US3210460A (en) * 1963-07-15 1965-10-05 Westinghouse Electric Corp Terminating means for shielded electrical conductors
US3210461A (en) * 1962-10-12 1965-10-05 Westinghouse Electric Corp Electrical stress-grading coatings
US3222566A (en) * 1961-11-16 1965-12-07 Joslyn Mfg & Supply Co Valve type lightning arrester
US3412200A (en) * 1966-12-08 1968-11-19 Asea Ab High voltage cable with potential gradient equalization means

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US493314A (en) * 1893-03-14 Lightning-arrester
US1159205A (en) * 1914-05-15 1915-11-02 Gen Electric Protective device.
US1935820A (en) * 1931-04-28 1933-11-21 Int Standard Electric Corp High tension cable terminal and joint
US2866135A (en) * 1954-12-15 1958-12-23 Mc Graw Edison Co Lightning arresters
US3222566A (en) * 1961-11-16 1965-12-07 Joslyn Mfg & Supply Co Valve type lightning arrester
US3210461A (en) * 1962-10-12 1965-10-05 Westinghouse Electric Corp Electrical stress-grading coatings
US3210460A (en) * 1963-07-15 1965-10-05 Westinghouse Electric Corp Terminating means for shielded electrical conductors
US3412200A (en) * 1966-12-08 1968-11-19 Asea Ab High voltage cable with potential gradient equalization means

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2445660A1 (de) * 1973-10-04 1975-04-17 Nkf Kabel Bv Elektrisches hochspannungskabel
GB2222323A (en) * 1988-08-22 1990-02-28 Hubbell Inc Sealed electrical cable connector for use in oil wells
GB2222323B (en) * 1988-08-22 1993-01-20 Hubbell Inc Electrical cable connector for use in oil wells
WO2013076038A3 (en) * 2011-11-23 2013-10-17 Tyco Electronics Raychem Gmbh Cover assemblies for electrical cables and methods and kits including same
US8883061B2 (en) 2011-11-23 2014-11-11 Tyco Electronics Raychem Gmbh Cover assemblies for electrical cables and methods and kits including same
US20170093143A1 (en) * 2014-02-19 2017-03-30 Abb Schweiz Ag Power Cable Termination Device For Gas-Insulated Switchgear
US9912140B2 (en) * 2014-02-19 2018-03-06 Abb Hv Cables (Switzerland) Gmbh Power cable termination device for gas-insulated switchgear
USRE48918E1 (en) * 2014-02-19 2022-02-01 Nkt Hv Cables Ab Power cable termination device for gas-insulated switchgear

Also Published As

Publication number Publication date
BE752118A (nl) 1970-12-17
NL6909217A (nl) 1970-12-21
DE2028663B2 (de) 1972-10-19
GB1292694A (en) 1972-10-11
DE2028663A1 (nl) 1970-12-23
SE377742B (nl) 1975-07-21
FR2052746A5 (nl) 1971-04-09

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