US3819851A - High voltage electrical insulator having an insulator body the entire surface of which is covered by a semiconductive glaze - Google Patents

High voltage electrical insulator having an insulator body the entire surface of which is covered by a semiconductive glaze Download PDF

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US3819851A
US3819851A US00313588A US31358872A US3819851A US 3819851 A US3819851 A US 3819851A US 00313588 A US00313588 A US 00313588A US 31358872 A US31358872 A US 31358872A US 3819851 A US3819851 A US 3819851A
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Prior art keywords
insulator
high voltage
bell
voltage electrical
air clearance
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US00313588A
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O Nigol
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Individual
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Priority to US00313588A priority Critical patent/US3819851A/en
Priority to ZA00738268A priority patent/ZA738268B/xx
Priority to CA184,464A priority patent/CA972044A/en
Priority to ES420102A priority patent/ES420102A1/es
Priority to IE1975/73A priority patent/IE38465B1/xx
Priority to AR250960A priority patent/AR196706A1/es
Priority to AU62595/73A priority patent/AU492886B2/en
Priority to NL7316465A priority patent/NL7316465A/xx
Priority to DE2359945A priority patent/DE2359945A1/de
Priority to LU68948A priority patent/LU68948A1/xx
Priority to BE138583A priority patent/BE808300A/xx
Priority to GB5667973A priority patent/GB1450697A/en
Priority to BR9570/73A priority patent/BR7309570D0/pt
Priority to IT70603/73A priority patent/IT1004656B/it
Priority to JP48137282A priority patent/JPS5759607B2/ja
Priority to FR7343770A priority patent/FR2209988B1/fr
Application granted granted Critical
Publication of US3819851A publication Critical patent/US3819851A/en
Anticipated expiration legal-status Critical
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    • 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
    • H01B17/50—Insulators or insulating bodies characterised by their form with surfaces specially treated for preserving insulating properties, e.g. for protection against moisture, dirt, or the like
    • 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
    • H01B17/38—Fittings, e.g. caps; Fastenings therefor
    • H01B17/40—Cementless fittings
    • 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
    • H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges

Definitions

  • a high voltage electrical insulator comprises an insulator body having a pair of upper and lower axially spaced terminals, the entire surface of the body being covered by a semiconductive layer providing a semiconductive path between the terminals, the insulator body providing at least one integral, downwardly depending, bell-shaped portion having an annular rim, said bell-shaped portion shrouding a predetermined area of said surface.
  • the geometry of the bell-shaped portion of the insulator body is such that the total protected creepage distance along the shrouded area of the surface is at least as great as the effective air clearance between the insulator terminals, the effective air clearance being the length of the total air gap in the shortest arcing path between the insulator terminals when all but the shrouded areas are wetted.
  • the minimum air clearance between the rim of the bell-shaped portion and the next lower unshrouded surface is at least 3.5 inches.
  • a high voltage electrical insulator comprises an insulator body having a pair of upper and lower axially spaced terminals, the entire surface of the body being covered by a semiconductive layer providing a semiconductive path between the terminals, the insulator body providing at least one integral, downwardly depending, bell-shaped portion having an annular rim, said bell-shaped portion shrouding a predetermined area of said surface.
  • the semiconductive layer is preferably applied to the surface of the insulator body as a glaze using a glazing composition as described in my copending application Ser. No. 301,340, filed Oct. 27, 1972 and entitled semiconductive Glaze Compositions.
  • the heating effect of the current passing through the semiconductive layer by raising the temperature of the surface by a few degrees (5C. C.) above ambient and thus preventing the moisture deposition on the surface, increases the flashover strength of a contaminated insulator surface which is exposed to fog and dew by at least five times.
  • This advantage in performance is maintained also under heavy rain conditions, since a predetermined area of the insulator surface is shrouded, by the bellshaped insulator body portion.
  • the performance of the insulator under heavy rain conditions is determined by the geometry of the insulator, more particularly by the shape of the interior of the bell-shaped portion and by the spacing of the rim of the bell-shaped portion from the nearest unshrouded surface.
  • the bell-shaped portion of the insulator body is deemed to shroud an area of the insulator structure lying within an inverted right-angled cone which intersects the rim of said portion and is coaxial therewith, this being the area which, in the absence of splashing, remains unwetted by rain falling in any direction at an angle of 45 to the axis of the insulator.
  • the minimum linear distance from the rim to the lower edge of such shrouded area is herein referred to as the minimum air clearance.
  • the minimum air clearance as so defined mustbe greater than the distance through which rain drops can be expected to splash upwardly from a lower unshrouded surface, under extreme conditions.
  • the minimum air clearance as determined by the maximum splashing distance, must be at least 3.5 inches. In order to provide adequate clearance under extreme icing conditions, the minimum air clearance should preferably be as great as 4.5 to 5 inches, but a value of 3.5 inches is found to be adequate for most climatic conditions encountered in practice. Now the whole of the shrouded area of the insulator surface will not necessarily remain unwetted under heavy rain conditions, because parts of the shrouded area will be exposed to splashing from lower surfaces upon which the rain may impinge.
  • the area which is protected from wetting will generally be less than the shrouded area by an amount determined by the geometry of the insulator and the splashing distance of the rain drops.
  • the protected area of the surface is therefore deemed to be that part of the shrouded area which is spaced from any unshrouded lower surface by a distance greater than the splashing distance. This spacing must be at least 3.5 inches.
  • the protected area is that part of the insulator surface which lies within an inverted right-angled cone intersecting the rim of the bell-shaped portion, and is spaced from the nearest unshrouded lower surface by at least 3.5 inches.
  • the protected creepage distance is herein defined as the minimum linear dimension of the semiconductive layer lying within the protected area, that is to say, the length of the shortest path extending over the semiconductive layer between the boundaries of the protected area. In the case of an insulator having a plurality of bell-shaped portions the total protected creepage distance will be the sum of the protected creepage distances of the separately shrouded areas.
  • the air clearance between the insulator terminals under dry conditions is simply the shortest arcing path between the terminals. This clearance will be effectively reduced by the conductive path lengths provided by the wetted surfaces of the insulator.
  • effective air clearance as used herein means the total air gap in the shortest arching path between the insulator terminals under extreme conditions, that is to say, when all but the protected areas of the insulator are wetted.
  • An insulator in accordance with the invention is characterized by the fact that the total protected creepage distance, as herein defined, is equal to or greater than the effective air clearance between the insulator terminals.
  • FIG. 1 is a view showing in half-sectional elevation two units of an insulator string according to the invention
  • FIG. 2 is a diagram of the equivalent circuit of one of the units shown in FIG. 1;
  • FIG. 3 is a half-sectional elevation, partially broken away, of a second insulator according to the invention.
  • FIG. 4 is a half-sectional elevation of a third insulator according to the invention.
  • FIG. 5 is a part-sectional elevation of a fourth insulator according to the invention.
  • FIG. 6 is a half-sectional elevation, partly broken away, of a fifth insulator according to the invention.
  • FIG. 7 is a half-sectional elevation, partly broken away, of a sixth insulator according to the invention.
  • FIG. 8 is a half-sectional elevation of a seventh insulator according to the invention.
  • FIG. 9 is a half-sectional elevation of an eighth insulator according to the invention.
  • the Minimum Air Clearance is the distance between the tim of a bell-shaped insulator portion and the nearest lower unshrouded surface. This distance is denoted by the distance AB in each of FIGS. 1, 4, 8 and 9.
  • the Effective Air Clearance is the length of the total air gap in the shortest arcing path between the insulator terminals when all but the protected areas are wetted.
  • the insulator terminals are not shown, but the effective air clearance is the sum of the distances AH, assuming that the point H does not lie in a protected area.
  • the effective air clearance is the sum of the distances A, H, 42 H
  • the effective air clearance is simply the distance AH.
  • the Protected Creepage Distance in FIG. 1 is denoted by the distance KF, the point K (or rather the line K) being distant from the point B by the splashing distance. This is assuming that the distance BG is not less than the splashing distance, but if it is less, then the protected creepage distance will be increased by a small amount below the socket II on the upper surface of the lower insulator.
  • the splashing distance determines the minimum air clearance AB.
  • the protected creepage distance for the bell-shaped portion is the distance AF extending along the insulator surface, where the spacing BF is the splashing distance, or minimum air clearance.
  • the protected creepage distance is the distance AF along the inner surface of the bell-shaped portion.
  • the Total Protected Creepage Distance is the sum of the individual protected creepage distances.
  • the total protected creepage distance is the sum of the distances KF.
  • the total protected creepage distance is the sum of the creepage distances corresponding to AF. In each of FIGS. 8 and 9, in which there is only one bell-shaped portion, the total protected creepage distance is equal to the protected creepage distance, i.e., AF.
  • FIG. 1 shows two insulator elements of an insulator string having an upper terminal and a lower terminal (not shown).
  • Each of the insulator elements comprises a downwardly depending, bell-shaped, porcelain body 10, the body flaring outwardly and providing an annular rim 10a, and a metal cap 11 which is bonded to the insulator body by conductive cement 12.
  • the elements are interconnected by axially extending metal pins 13, the upper end of each pin being located in a well at the top end of the insulating body and bonded thereto by conductive cement, grout and elastic cushion 14.
  • the lower end of each pin is provided with an enlarged portion 15 which engages in a socket 16 provided in the metal cap of the adjacent lower element to be retained thereby.
  • each bell-shaped insulator body consisting of the inner surface 17a extending from the rim 10a to the conductive cement l4 and the outer surface 17b extending from the rim 10a to the conductive cement 12, is covered by a semiconductive layer which provides an uninterrupted semiconductive path between the metal cap 11 and pin 13.
  • This semiconductive layer is formed by glazing the surface of the insulator body using a semiconductive glaze composition as described in my above identified copending application Ser. No. 301,340.
  • each of the bell-shaped insulator bodies 10 shrouds a predetermined area of the surface of the insulator structure so as to shield that area of the surface from driving rain.
  • each of the shrouded areas may be considered to comprise the total surface lying within an inverted right angled cone which intersects the annular rim 10a of a respective insulator body 10 and which is coaxial therewith.
  • the upper insulator body is considered to shroud all surfaces lying within the inverted cone denoted by the broken lines A, B, C, D, E, including the whole of the inner surface of the upper body and the portion of the outer surface of the lower body lying above a line DB.
  • the minimum air clearance between the rim of each insulator body and the next unshrouded surface, denoted by the distance AB, should be at least 3.5 inches and is preferably 4.5 or 5 inches. This spacing is maintained in order to provide adequate electrical strength under heavy rain and icing conditions.
  • the protected creepage distance is essentially the total arc length of the generatrices of the surface or surfaces of revolution which define protected area of semiconductive layer lying within the area shrouded by the bellshaped insulator portion 10.
  • the total protected creepage distance that is the sum of the protected creepage distances defined by the plurality of bell-shpaed portions, should be at least as great as the effective air clearance between the insulator terminals in order to provide maximum electrical strength for a given total length of insulator.
  • the electrical strength of the semiconductive layer in the protected areas is 10 kV per inch, the insulator being designed for a 230 kV line with a maximum voltage of 200 kV (crest) to ground and a maximum switching surge voltage of twice the total normal voltage, the protected creepage distance must be about 40 inches.
  • six insulator elements should be used, the total length of a six unit string being about one half of the length of a conventional insulator string meeting the same insulation requirements.
  • the heat produced by electric current in the protected creepage areas must be sufficient to raise the surface temperature by 4 or 5C. above ambient. For most insulator designs this would require a generation of heat of 0.01 to 0.1 watts per square inch.
  • the surface resistivity necessary to generate that amount of heat for different system voltages ranges from about 5 megohms per square to about 200 megohms per square.
  • FIG. 2 shows the equivalent circuit of such a capacitor. From the diagram of this circuit, it is apparent that a higher self-capacitance will result in a lower capacitive reactance and a proportionally higher capacitive current. The components of this capacitive current are shown in FIG. 2 by small arrows. Thus 1,. total capacitive current, amperes where X, capacitive reactance, ohms C total self-capacitance, farads F power frequency, Hz
  • the power dissipation and the heating effect in the semiconductive layer are dependent on both variables.
  • the power dissipation will be where AR resistance of the centre portion, ohms.
  • the power dissipation and the temperature rise in the insulator are much less dependent on the glaze resistivity. If the glaze resistivity is either low or high, the portion of the total resistance AR appearing in the above expression will adjust itself accordingly so as to maintain a more constant value. The net effect of this stabilization is to widen the tolerance on the resistivity of the semiconductive glaze.
  • suspension insulators of the form described with reference to FIG. 1 having resistance values between 30 and megohms (measured at 20 kV DC) give entirely satisfactory performance when used in strings of six elements each on 230 kV AC lines.
  • the insulator shown in FIG. 3 consists of a porcelain body 20 having an upper terminal constituted by a glazed surface of high conductivity 21, and a lower terminal consisted by a metal base 22 with a bolt 23.
  • the insulator body provides a plurality of downwardly depending, bell-shaped, portions 20', and 20", each of which shrouds a predetermined area of the surface of the insulator as hereinbefore described.
  • each shrouded area is considered to be the entire surface of the insulator body lying within each of the inverted, right angled cones which intersect the rims of the bell-shaped portions and are coaxial therewith.
  • the entire surface of the insulator body lying between the upper and lower terminals is covered by a glazed semiconductive layer providing a surface resistivity in the range from 5 megohms per square to 200 megohms per square and an electrical strength of about 10 kV per inch in the protected areas.
  • the total protected creepage distance along the protected area within the shrouded areas of the semiconductive layer should be at least as great as the effective air clearance between the insulator terminals; and to provide adequate electrical strength inv heavy rain and icing conditions the minimum air clearance between each of the rims of the bell-shaped portions and the next lower unshrouded area of the semiconductive layer should be at least 3.5 inches and preferably 4.5 to 5 inches.
  • the embodiment illustrated in FIG. 4 is essentially similar to the embodiment of FIG. 3, and corresponding parts are denoted by the same reference numerals.
  • the upper insulator 24 consists of a metal cap bonded to the upper end of the insulator body by means of a conductive cement grout and elastic cushion 25.
  • the lower terminal is constituted by a flanged metal base 26, the lower end of the insulator body being located in a well in the base and bonded thereto by a conductive cement grout and cushion 27.
  • the cement grout used in this embodiment, and the other illustrated embodiments of the invention, is rendered conductive by incorporating small amounts of graphite powder and fibres to the grout.
  • FIG. 5 is a bushing insulator also of the same basic construction, corresponding parts thereof being denoted by the same reference numerals as in FIGS. 3 and 4. It will be noted that the upper terminal 24 and the lower terminal 26 which form a through connection are of a slightly modified construction, and are provided with metal studs 28 and 29, respectively.
  • the insulator body is constructed as a post consisting of a plurality of porcelain cones or bell-shaped elements, 30, each being flared outwardly at its lower end and terminating in an annular rim 30a.
  • the cones or bell-shaped elements are bonded together by means of a conductive cement grout, indicated at 31, for example, and the upper and lower terminals-of the insulator are constituted by a metal cap 32 and a flanged metal base 33, which are of the same construction as the terminals 24 and 26 shown in FIG. 4.
  • each of the elements 30 is considered to shroud an area lying within an inverted right angled cone insecting its rim and coaxial therewith.
  • the total protected creepage distance represented by the sum of the minimum linear dimensions of the protected areas lying within the shrouded areas of the semiconductive layer, is at. least as great as the effective air clearance between the upper and lower terminals.
  • the minimum air clearance between each of the rims 30a and the next lower unshrouded area should be at least 3.5 inches and preferably 4.5 to inches.
  • FIG. 7 is basically the same as the embodiment of FIG. 6, and corresponding parts thereof are denoted by the same reference numerals. However, this differs from the preceding embodiment in that the shrouding elements 30 alternate with bell-shaped spacer elements 34.
  • the designs illustrated in FIGS. 6 and 7 provide alternative means for obtaining the required air clearances to meet particular insulation requirements.
  • FIGS. 8 and 9 illustrate insulators in which the insulator body provides just one bell-shaped body portion, 35, each insulator having a lower terminal constituted by a metal post 36 (in FIG. 8) and 37 (in FIG. 9).
  • the upper end of the post 36 or 37 is located in a well of the insulator body which is filled with conductive cement grout 38.
  • the upper terminal of the insulator shown in FIG. 8 is provided by a semiconductive glazed layer of relaively high conductivity, indicated at 39, this layer being substantially the same as that shown in FIG. 3.
  • the upper terminal 40 of the insulator shown in FIG. 9 is constituted by a metal cap having the same construction as the cap 24 shown in FIG. 4.
  • the surface of the semiconductor body is covered by a glazed semiconductive layer providing an uninterrupted semiconductive path between the upper and lower terminals, the layer having a surface resistivity between 5 megohms per square and 200 megohms per square, and having an electrical strength of about kV per inch in the protected areas.
  • the minimum air clearance between the rim of the insulator body 35 and the lower terminal 36 or 37 is at least 3.5 inches and preferably 4.5 to 5 inches. This distance is denoted in each of the FIGS. 8 and 9 by the line AB, which line lies in the surface of an inverted right angled cone insecting the rim of the insulator body and coaxial therewith.
  • the protected creepage distance in each case which is denoted by the distance AF along the inner surface of the insulator body, should be at least as great as'th'e effective air clearance between the upper and lower terminals.
  • a high voltage electrical insulator comprising an insulator body having a pair of upper and lower axially spaced terminals, the entire surface of the body being covered by a semiconductive layer providing a semiconductive path between the terminals, the insulator body having at least one integral, downwardly depending, bell-shaped portion having an annular rim, said bell-shaped portion shrouding a predetermined area of said surface, wherein the total protected creepage distance along said predetermined area of the surface is at least as great as the effective air clearance between the terminals, and wherein the minimum air clearance between the rim or each of the rims and the next lower unshrouded surface is at least 3.5 inches.
  • a high voltage electrical insulator according to claim 1 the insulator body providing a plurality of said bell-shaped portions each shrouding a predetermined area of the semiconductive layer surface, said shrouded areas being separated by unshrouded areas, wherein the minimum air clearance between each of the rims and the next lower unshrouded area is at least 3.5
  • a high voltage electrical insulator according to claim 1 the insulator body providing only one bellshaped portion, wherein the minimum air clearance between the rim and the lower terminal is at least 3.5 inches.
  • a high voltage electrical insulator consisting of a string of downwardly depending, bell-shaped insulator bodies each having an annular rim, the string of insulator bodies extending coaxially between upper and lower terminal conductors and being interconnected by axially extending pins constituting intermediate conductors, the entire surface of each insulator body being covered by a semiconductive layer providing a semiconductive path between an adjacent pair of said conductors, each insulator body shrouding a predetermined area of the surface of said insulator string, wherein the total protected creepage distance along the shrouded areas of the insulator string is at least as great as the effective air clearance between the upper and lower terminals, and wherein the minimum air clearance between the rim of each insulator body and the next lower unshrouded surface is at least 3.5 inches.

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  • Power Engineering (AREA)
  • Insulators (AREA)
US00313588A 1972-12-08 1972-12-08 High voltage electrical insulator having an insulator body the entire surface of which is covered by a semiconductive glaze Expired - Lifetime US3819851A (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
US00313588A US3819851A (en) 1972-12-08 1972-12-08 High voltage electrical insulator having an insulator body the entire surface of which is covered by a semiconductive glaze
ZA00738268A ZA738268B (en) 1972-12-08 1973-10-25 High voltage electrical insulator
CA184,464A CA972044A (en) 1972-12-08 1973-10-29 High voltage electrical insulator
ES420102A ES420102A1 (es) 1972-12-08 1973-10-30 Perfeccionamientos en aisladores electricos de voltaje ele-vado.
IE1975/73A IE38465B1 (en) 1972-12-08 1973-11-01 High voltage electrical insulator
AR250960A AR196706A1 (es) 1972-12-08 1973-11-12 Aislador electrico de voltaje elevado
AU62595/73A AU492886B2 (en) 1972-12-08 1973-11-16 High voltage electrical insulator
NL7316465A NL7316465A (xx) 1972-12-08 1973-11-30
DE2359945A DE2359945A1 (de) 1972-12-08 1973-12-01 Elektrischer hochspannungsisolator
LU68948A LU68948A1 (xx) 1972-12-08 1973-12-06
BE138583A BE808300A (fr) 1972-12-08 1973-12-06 Isolateur electrique a haute tension
GB5667973A GB1450697A (en) 1972-12-08 1973-12-06 High voltage electrical insulator
BR9570/73A BR7309570D0 (pt) 1972-12-08 1973-12-06 Isolador eletrico de alta tensao
IT70603/73A IT1004656B (it) 1972-12-08 1973-12-07 Isolatore elettrico per alta tensione
JP48137282A JPS5759607B2 (xx) 1972-12-08 1973-12-07
FR7343770A FR2209988B1 (xx) 1972-12-08 1973-12-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00313588A US3819851A (en) 1972-12-08 1972-12-08 High voltage electrical insulator having an insulator body the entire surface of which is covered by a semiconductive glaze

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US3819851A true US3819851A (en) 1974-06-25

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US00313588A Expired - Lifetime US3819851A (en) 1972-12-08 1972-12-08 High voltage electrical insulator having an insulator body the entire surface of which is covered by a semiconductive glaze

Country Status (15)

Country Link
US (1) US3819851A (xx)
JP (1) JPS5759607B2 (xx)
AR (1) AR196706A1 (xx)
BE (1) BE808300A (xx)
BR (1) BR7309570D0 (xx)
CA (1) CA972044A (xx)
DE (1) DE2359945A1 (xx)
ES (1) ES420102A1 (xx)
FR (1) FR2209988B1 (xx)
GB (1) GB1450697A (xx)
IE (1) IE38465B1 (xx)
IT (1) IT1004656B (xx)
LU (1) LU68948A1 (xx)
NL (1) NL7316465A (xx)
ZA (1) ZA738268B (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941918A (en) * 1973-01-22 1976-03-02 Canadian Porcelain Company Limited Electrical insulator including an insulation shell having hardware members secured thereto by cement containing graphite fibers
US4891473A (en) * 1989-05-22 1990-01-02 Olaf Nigol High voltage insulators constructed to have plural dry bands in use
US5548089A (en) * 1994-01-13 1996-08-20 Cooper Industries, Inc. Bushing for gas-insulated switchgear
US20130186683A1 (en) * 2012-01-23 2013-07-25 General Electric Company High Voltage Bushing Assembly
US20130199837A1 (en) * 2012-02-08 2013-08-08 General Electric Company Corona resistant high voltage bushing assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL2605023T3 (pl) * 2011-12-16 2018-02-28 Arteche Lantegi Elkartea, S.A. Wysokonapięciowy rozdzielacz napięcia i złącze zawierające wymieniony rozdzielacz

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FR577253A (fr) * 1923-03-29 1924-09-03 Motor Columbus Sa D Entpr S El Isolateur à suspension
US1661823A (en) * 1921-06-04 1928-03-06 Locke Insulator Corp Insulator
GB312205A (en) * 1928-02-20 1929-05-21 Fritz Berg Insulator for electric live wires
GB310021A (en) * 1928-04-20 1929-10-24 Bbc Brown Boveri & Cie Improvements in electric insulators
US1742628A (en) * 1927-05-11 1930-01-07 Barfoed Svend High-tension insulator
US1768948A (en) * 1921-12-03 1930-07-01 Westinghouse Electric & Mfg Co High-voltage insulator
FR50462E (fr) * 1939-03-02 1940-11-14 Electricite De Paris Soc D Isolateur pour lignes aériennes à haute tension
GB586065A (en) * 1945-05-21 1947-03-05 Taylor Tunnicliff And Company Improvements in electric insulators
DE914141C (de) * 1938-02-11 1954-06-28 Porzellanfabrik Kahla Keramischer Isolierkoerper mit Regenschutzschirmen
US3368026A (en) * 1965-11-02 1968-02-06 Doulton & Co Ltd Electrical insulator having improved surface electrical stress distribution
GB1144430A (en) * 1968-01-17 1969-03-05 Doulton & Co Ltd Electrical insulator assembly with improved temperature characteristics
US3658583A (en) * 1969-10-11 1972-04-25 Ngk Insulators Ltd Method for producing semi-conducting glaze compositions for electric insulators

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1661823A (en) * 1921-06-04 1928-03-06 Locke Insulator Corp Insulator
US1768948A (en) * 1921-12-03 1930-07-01 Westinghouse Electric & Mfg Co High-voltage insulator
FR577253A (fr) * 1923-03-29 1924-09-03 Motor Columbus Sa D Entpr S El Isolateur à suspension
US1742628A (en) * 1927-05-11 1930-01-07 Barfoed Svend High-tension insulator
GB312205A (en) * 1928-02-20 1929-05-21 Fritz Berg Insulator for electric live wires
GB310021A (en) * 1928-04-20 1929-10-24 Bbc Brown Boveri & Cie Improvements in electric insulators
DE914141C (de) * 1938-02-11 1954-06-28 Porzellanfabrik Kahla Keramischer Isolierkoerper mit Regenschutzschirmen
FR50462E (fr) * 1939-03-02 1940-11-14 Electricite De Paris Soc D Isolateur pour lignes aériennes à haute tension
GB586065A (en) * 1945-05-21 1947-03-05 Taylor Tunnicliff And Company Improvements in electric insulators
US3368026A (en) * 1965-11-02 1968-02-06 Doulton & Co Ltd Electrical insulator having improved surface electrical stress distribution
GB1144430A (en) * 1968-01-17 1969-03-05 Doulton & Co Ltd Electrical insulator assembly with improved temperature characteristics
US3658583A (en) * 1969-10-11 1972-04-25 Ngk Insulators Ltd Method for producing semi-conducting glaze compositions for electric insulators

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941918A (en) * 1973-01-22 1976-03-02 Canadian Porcelain Company Limited Electrical insulator including an insulation shell having hardware members secured thereto by cement containing graphite fibers
US4891473A (en) * 1989-05-22 1990-01-02 Olaf Nigol High voltage insulators constructed to have plural dry bands in use
EP0399641A1 (en) * 1989-05-22 1990-11-28 Olaf Nigol High voltage insulators
US5548089A (en) * 1994-01-13 1996-08-20 Cooper Industries, Inc. Bushing for gas-insulated switchgear
US20130186683A1 (en) * 2012-01-23 2013-07-25 General Electric Company High Voltage Bushing Assembly
US8704097B2 (en) * 2012-01-23 2014-04-22 General Electric Company High voltage bushing assembly
US20130199837A1 (en) * 2012-02-08 2013-08-08 General Electric Company Corona resistant high voltage bushing assembly
US8716601B2 (en) * 2012-02-08 2014-05-06 General Electric Company Corona resistant high voltage bushing assembly

Also Published As

Publication number Publication date
ZA738268B (en) 1975-06-25
ES420102A1 (es) 1976-03-16
IE38465L (en) 1974-06-08
FR2209988B1 (xx) 1980-01-04
IT1004656B (it) 1976-07-20
AU6259573A (en) 1975-05-22
BR7309570D0 (pt) 1974-08-29
JPS5759607B2 (xx) 1982-12-15
BE808300A (fr) 1974-03-29
IE38465B1 (en) 1978-03-15
DE2359945A1 (de) 1974-06-12
JPS4988095A (xx) 1974-08-22
GB1450697A (en) 1976-09-22
CA972044A (en) 1975-07-29
LU68948A1 (xx) 1974-02-12
FR2209988A1 (xx) 1974-07-05
AR196706A1 (es) 1974-02-12
NL7316465A (xx) 1974-06-11

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