US3715532A - Encapsulated high voltage-switching installation - Google Patents

Encapsulated high voltage-switching installation Download PDF

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Publication number
US3715532A
US3715532A US00210366A US3715532DA US3715532A US 3715532 A US3715532 A US 3715532A US 00210366 A US00210366 A US 00210366A US 3715532D A US3715532D A US 3715532DA US 3715532 A US3715532 A US 3715532A
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US
United States
Prior art keywords
conductor
high voltage
sheath
trumpet
insulating
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
US00210366A
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English (en)
Inventor
T Morva
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.)
Rockwell Automation Switzerland GmbH
Original Assignee
Sprecher und Schuh AG
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 Sprecher und Schuh AG filed Critical Sprecher und Schuh AG
Application granted granted Critical
Publication of US3715532A publication Critical patent/US3715532A/en
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    • 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
    • H02G5/00—Installations of bus-bars
    • H02G5/06—Totally-enclosed installations, e.g. in metal casings
    • H02G5/066—Devices for maintaining distance between conductor and enclosure
    • H02G5/068—Devices for maintaining distance between conductor and enclosure being part of the junction between two enclosures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/045—Details of casing, e.g. gas tightness

Definitions

  • ABSTRACT [30] Foreign Application Priority Data An encapsulated high voltage-switching installation, the cylindrical conductor of which serves to carry a April 19, 1971 Switzerland ..5629/7l high voltage and is urrounded by a grounded cylindrical sheath filled with an insulating gas.
  • the conductor [52] US. Cl. ..174/28, 174/73 R is concentrically attached within the sheath by means [51] Int. Cl. ..H0lb 9/04 of insulating supports.
  • At least one p pe foil P 2 4 sessing a rotationally symmetrical construction and widening in the axial direction of the conductor is ar- [56] References Cited ranged between the conductor and the sheath, this 7 trumpet-shaped foil being formed of an insulating UNITED STATES PATENTS material.
  • the present invention relates to a new and improved encapsulated high voltage-switching installation, the cylindrical conductor of which serving to carry a voltage is surrounded by a grounded cylindrical sheath filled with an insulating gas and concentrically secured therein by insulating supports.
  • Disc-shaped insulating supports consisting of a casting resin are known in the art for encapsulated high voltage-switching installations, these disc-shaped insulation supports being arranged between the conductor and the sheath.
  • the electrical field strength or intensity is not constant between two concentrically arranged cylindrical electrodes and as is known extends in radial direction in accordance with a function containing a logarithmic component.
  • the electrical field strength is practically constant at the surface of the known disc-shaped insulation supports, because the electrical field is controlled by the thickness of the discshaped insulation supports, this thickness increasing in the direction of the conductor.
  • trumpet-shaped insulation supports are also known in the art for the purpose of supporting the inner conductor in concentric cylindrical coaxial transmission lines.
  • the voltage distribution is uniform at the surface of a very thin trumpet-shaped insulating layer suitably arranged between two concentric cylindrical electrodes and hence there is also present a constant electrical field strength.
  • the heretofore known trumpet-shaped insulation supports possess a relatively large wall thickness owing to mechanical strength considerations. Due to interruption or breaking of the lines of theelectrical field at the'insulation walls there appears an irregular electrical load at the surface of the known trumpet-shaped thick-wall insulation supports.
  • a primary object of the present invention is to provide an encapsulated high voltageswitching installation which is not associated with these drawbacks and limitations and which effectively and reliably fulfills the existing need in the art.
  • Another and more specific object of the present invention is to provide a novel construction ofencapsulated high voltage-switching installation wherein the sensitivity of the insulation supports against contamination or soiling is reducedand therefore the operational reliability increased.
  • the encapsulated high voltage-switching installation of the present invention contemplates providing at least one rotationally symmetrical trumpet-shaped foil or sheet formed of insulating material between the conductor and the sheath and which trumpet-shaped foil enlarges or widens in the axial direction of the conductor.
  • a particularly advantageous modification of the invention resides in the features that through appropriate curvature of the surface of the foil for the same electrical potential differences determined from the field pattern between the conductor and the sheath there are chosen the same creepage path lengths.
  • FIG. 1 is a fragmentary longitudinal sectional view of an encapsulated gas insulated conductor secure within a grounded sheath by means of disc-shaped insulation supports;
  • FIG. 2 is a fragmentary longitudinal sectional view of a modified form of encapsulated gas insulated conductor secured within a grounded sheath by means of discshaped insulation supports. 7
  • FIG. 1 the cylindrical conductor l depicted in FIG. 1 is intended to carry a voltage.
  • This cylindrical conductor 1 is surrounded by a cylindrical sheath 2 formed of an aluminum tube and which is at ground potential.
  • a disc-shaped insulation support 3 is clamped between both flanges 4 of the sheath 2 and carries an inner electrode 5 electrically coupled with the conductor 1.
  • the disc-shaped insulation support member 3 consists of a suitable casting resin extended by a filler and enlarges in the direction of the conductor 1, as shown. Since the dielectric constant of the filled extendedcasting resin is four to five times greater than that of the insulating gas which is located between the conductor 1 and the sheath 2 it is possible to obtain a practically uniform voltage distributionover the surface of the insulation support or support member 3.
  • the capacitance of the insulation support member 3 present in the radial direction along each unit length increases somewhat towards the inside in order to obtain the desired uniform voltage distribution.
  • trumpet-shaped foils or sheets 6 formed of an insulating material and constructed so as to be rotationally symmetrical. These trumpetshaped foils 6 widen in the axial direction of the conductor 1, as shown.
  • the foils 6 are clamped at the outside i.e., at their largest opening 6a between the flanges 4 and the insulating support 3 and at the inside i.e., at the smaller opening 6b such foils 6 are attached to the conductor 1 by means of a tape 7 or equivalent structure.
  • Each foil 6 is formed of a suitable plastic material, such as for instance polyethylene, polypropylene, TEFLON, polymonochlorotrifluoroethylene, fluorinated ethylene-propylene, polyvinylchloride, polyvinalfluoride, polyester or a high-molecular cellulose derivative such as cellulose acetate.
  • the thickness of the foil amounts to less than 1 millimeter for a 200 kV switching installation.
  • FIG. 2 there is illustrated a modified embodiment of encapsulated high voltage-switching installation wherein generally the same reference characters have been employed for the same components. It should be understood that this embodiment resorts to the use of a modified insulation support 8.
  • the disc-shaped insulation support member 8 is provided with the tubular-shaped extensions 9 which directly surround the conductor 1.
  • the inner surface of the insulation support 8 equipped with the extensions 9 and facing the conductor 1 is metallized and electrically conductively connected with the conductor 1.
  • the extensions 9 serve for supporting the region of smaller openings 6b of the foils 6.
  • the foils 6 are clamped at the outside regions i.e., at the region possessing the largest opening 6a between the flanges 4 and the insulation support 8, as shown, and bear against the disc-shaped portions 8a of the insulating member 8.
  • the foils 6 can be adhesively bonded at their contact surfaces with the extensions 9 and with the insulation support 8.
  • An encapsulated high voltage-switching installation comprising a cylindrical conductor intended to carry a high voltage, a grounded cylindrical sheath filled with an insulating gas surrounding said conductor, insulating support means for concentrically connecting said conductor with said sheath, and at least one rotationally symmetrical substantially trumpetshaped foil formed of insulating material arranged between said conductor and said sheath, said trumpetshaped foil widening in the axial direction of the conductor.
  • said insulating support means comprises a substantially disc-shaped insulation support member having disc-shaped portions and substantially tubular-shaped extensions which directly surround said conductor, and wherein said trumpetshaped foil has its end possessing the largest opening bearing against said disc-shaped portions of said insulation support member and having its smaller opening bearing against said tubular-shaped extensions of said insulation support means which directly surround said conductor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Insulators (AREA)
  • Insulating Bodies (AREA)
US00210366A 1971-04-19 1971-12-21 Encapsulated high voltage-switching installation Expired - Lifetime US3715532A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH562971A CH521676A (de) 1971-04-19 1971-04-19 Gekapselte Hochspannungs-Schaltanlage

Publications (1)

Publication Number Publication Date
US3715532A true US3715532A (en) 1973-02-06

Family

ID=4296794

Family Applications (1)

Application Number Title Priority Date Filing Date
US00210366A Expired - Lifetime US3715532A (en) 1971-04-19 1971-12-21 Encapsulated high voltage-switching installation

Country Status (6)

Country Link
US (1) US3715532A (de)
AT (1) AT314028B (de)
CH (1) CH521676A (de)
DE (1) DE7143373U (de)
FR (1) FR2133731B1 (de)
GB (1) GB1358708A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3801725A (en) * 1972-11-14 1974-04-02 Westinghouse Electric Corp Spacer construction for fluid-insulated transmission lines
US3920885A (en) * 1975-03-14 1975-11-18 Gen Electric High-voltage, compressed-gas-insulated bus
US3990001A (en) * 1973-05-17 1976-11-02 Siemens Aktiengesellschaft Measuring transformer for installation in the metal enclosure of a switching installation
US4132854A (en) * 1977-08-29 1979-01-02 Westinghouse Electric Corp. Multiple conductor gas insulated transmission line
US20130100587A1 (en) * 2010-09-13 2013-04-25 Mitsubishi Electric Corporation Gas-insulated electric device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2526671C2 (de) * 1975-06-14 1983-09-15 Brown, Boveri & Cie Ag, 6800 Mannheim Stützisolator einer metallgekapselten, gasisolierten Hochspannungsleitung für elektrische Schaltanlagen
JPS6311016A (ja) * 1986-06-30 1988-01-18 三菱電機株式会社 ガス絶縁開閉装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE910437C (de) * 1944-05-06 1954-05-03 Siemens Ag Anordnung fuer Hochspannungssammelschienen
GB879712A (en) * 1956-11-07 1961-10-11 Ass Elect Ind Improvements relating to electrical co-axial transmission lines
AT242226B (de) * 1962-08-15 1965-09-10 Licentia Gmbh Verbindungsstelle zwischen den einzelnen Geräten einer metallgekapselten Hochspannungsschaltanlage
US3446741A (en) * 1963-11-14 1969-05-27 Minnesota Mining & Mfg Insulating device,composition,and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE910437C (de) * 1944-05-06 1954-05-03 Siemens Ag Anordnung fuer Hochspannungssammelschienen
GB879712A (en) * 1956-11-07 1961-10-11 Ass Elect Ind Improvements relating to electrical co-axial transmission lines
AT242226B (de) * 1962-08-15 1965-09-10 Licentia Gmbh Verbindungsstelle zwischen den einzelnen Geräten einer metallgekapselten Hochspannungsschaltanlage
US3446741A (en) * 1963-11-14 1969-05-27 Minnesota Mining & Mfg Insulating device,composition,and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3801725A (en) * 1972-11-14 1974-04-02 Westinghouse Electric Corp Spacer construction for fluid-insulated transmission lines
US3990001A (en) * 1973-05-17 1976-11-02 Siemens Aktiengesellschaft Measuring transformer for installation in the metal enclosure of a switching installation
US3920885A (en) * 1975-03-14 1975-11-18 Gen Electric High-voltage, compressed-gas-insulated bus
US4132854A (en) * 1977-08-29 1979-01-02 Westinghouse Electric Corp. Multiple conductor gas insulated transmission line
US20130100587A1 (en) * 2010-09-13 2013-04-25 Mitsubishi Electric Corporation Gas-insulated electric device
DE112010005871B4 (de) * 2010-09-13 2016-03-17 Mitsubishi Electric Corporation Gasisoliertes elektrisches Gerät
US9431800B2 (en) * 2010-09-13 2016-08-30 Mitsubishi Electric Corporation Gas-insulated electric device

Also Published As

Publication number Publication date
CH521676A (de) 1972-04-15
FR2133731A1 (de) 1972-12-01
DE7143373U (de) 1973-01-18
FR2133731B1 (de) 1975-06-20
AT314028B (de) 1974-03-11
GB1358708A (en) 1974-07-03

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