US3354262A - Self-washing insulators - Google Patents

Self-washing insulators Download PDF

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Publication number
US3354262A
US3354262A US638430A US63843067A US3354262A US 3354262 A US3354262 A US 3354262A US 638430 A US638430 A US 638430A US 63843067 A US63843067 A US 63843067A US 3354262 A US3354262 A US 3354262A
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US
United States
Prior art keywords
fin
insulator
protuberances
radius
insulators
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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
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US638430A
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English (en)
Inventor
Meier Henri
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.)
Compagnie General dElectro Ceramique SA
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Compagnie General dElectro Ceramique SA
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Publication date
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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
    • H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
    • 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
    • H01B17/52—Insulators or insulating bodies characterised by their form having cleaning 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
    • H01B17/52—Insulators or insulating bodies characterised by their form having cleaning devices
    • H01B17/525—Self-cleaning, e.g. by shape or disposition of screens

Definitions

  • the present invention relates to improvements in insulator fins, notably in high voltage self-washing insulators, that is, insulators which clean themselves automatically due to the trickling of rain water, such as insulators consisting essentially of a solid or hollow stem or shank on which one or more helical fins are wound.
  • the invention consists notably in the definition of certain dimensions or dimensional ratios relative to the fin in respect of which the applicant has ascertained that there is a substantial improvement in the properties of the insulators.
  • the insulator fin according to the invention is remarkable notably in that it comprises at least three protuberances, the dimensions of the fin being such that the ratio of the terminal thickness of the fin and of the fin pitch is lower than 0.5, the length of the fin is greater than 20 mm., the fin thickness ranges between 6 and 18 mm., and the pitch length of the fin ranges between and 50 mm.
  • the fin comprises a profile having spaced teeth, the radius ofthe relief portions being less than the radius of the recessed portions.
  • the fin comprises protuberances, the height of which decreases in proportion as the end of the fin is approached.
  • the said lines constitute half-angle cones less than 12 in respect of the outer cone envelope and less than 7 in respect of the inner cone envelope, the end protuberances being contained within the outer cone envelope.
  • FIGURE 1 shows, diagrammatically, in section, a fin profile of known type.
  • FIGURE 2 shows, diagrammatically, in section, a fin profile according to the invention.
  • FIGURE 3 shows a further embodiment of the fin profile according to the invention.
  • FIGURE 1 shows a fin of known type comprising two protuberances of the same height, the half-view on the left shows a solid stem or shank, Whereas the right-hand half-view shows a hollow stem or shank.
  • the fin comprises three protuberances which are very considerably rounded and comprise an end protuberance 1 and two intermediate protuberances 2 and 3, the height of the protuberances decreasing in proportion as one moves away from the stem 4 of the insulator.
  • the ratio e/p is selected to be lower than 0.5, and is preferably between 0.3 and 0.5, the length a is greater than 20' mm., preferably between 25 and 50 mm, the thickness e is between 6 and 18 mm., preferably between 8 and 12 mm., the pitch 1 varies from 15 to 50 mm., preferably from 18 to 35 mm., the radius r of the relief portions is approximately of the radius R of the central recessed portion.
  • the radius of the relief portions will be approximately 3 mm.
  • the radius of the recessed portions will be, proceeding from the stem towards the edge 543.5 mm.
  • these dimensions will be modified approximately in the same ratio as that of the measurement of the said depth. Since the height of the protuberances decreases in proportlon as one moves and the recesses 5, 6, 7 formed between the said protuberances are joined by a line, it will be found that these lines constitute half-angle cones b which are less than 12 in respect of the outer cone envelope 8 and c which are less than 7 in respect of the inner cone envelope 9. Furthermore, the end protuberance 1 is contained within the outer cone envelope 8, for example, b will be equal to 106, and c to 67.
  • the fin comprises protuberances having spaced teeth leaving a considerable recess between them, the radius of the central relief portion and that of the relief portion adjacent the stern being approximately 4 of the radius of the central recessed portion, the end relief portion 1 having a radius double that of the further relief portions 2 and 3.
  • the radius of the central relief portion 2 and the relief portion adjacent the stem 3 will be approximately 1 mm.
  • the radius of the end relief portion 1 will be approximately 2 mm.
  • the radius of the recessed portions will be, proceeding from the stem towards the edge, 5.54.5 4.5 mm. With diflerent fin depths, these dimensions will be modified approximately in the same ratio as that of the measurement of the said depths.
  • the enveloping curves of the apex of the protuberances and of the fin recesses constitute half-angle cones b less than 12 in respect of the external cone envelope, and 0 less than 7 in respect of the inner cone envelope, for example, b will be equal to 7 and c to 45.
  • the table shown hereinbelow gives, by way of example, some numerical values for certain dimensions in mm. and certain dimensional ratios relating to some embodiments of known fins and fins according to the invention.
  • the fins 1 and 2 are of the type shown in FIGURE 1, the fins 3 have a profile corresponding to that of FIGURE 2, the
  • fins 4 and 5 a profile corresponding to that of FIGURE 3.
  • Pollution cycle 3 h. deposit of dust at the rate 750 g. per hour, using a kaolin dust, followed by 3 h. of saline mist (solution of 31 g. of NaCl per litre of water), at the rate of 16 litres per hour.
  • the insulator equipped with conventional fins according to type 1 held 2 2- 3- 2 cycles, whereas the insulator equipped with fins according to 4 held 3-344 cycles before flashover.
  • insulators are manufactured of the type known under the name of Spirelec, this being a mark registered by the applicant, with a fin corresponding to the conventional profile type 2 and with a fin corresponding to the profile type 3 having spaced teeth in accordance with the invention, and if the insulators are comparatively subjected to dust-depositing cycles identical with those described hereinabove, it is found that the insulator of conventional type holds 3 cycles, whereas the insulator provided with fins according to the invention holds 4 cycles.
  • the dust-depositing cycle is 3 h. of kaolin by3h.salinernist, Each cycle being separated by washing for 5 minutes with rain of conventional intensity (3 mm./minute) and with a resistivity of 7000 ohm cm., it is found that the insulator having a conventional fin withstands 21 cycles before fiashover, the insulator having a fin according to the invention withstands 38 cycles, that is, an improvement of 81%.
  • the fin profile according to the invention may be applied equally well to an apparatus insulator and to a line insulator, to a support column or to an envelope, and equally well to a suspension insulator of'the type having a long stem for example, whatever the material used or the details in respect of design, manufacture and assembly of the insulating part.
  • an insulator of the type comprising a stem which constitutes a body of revolution
  • the improvement comprising one or more helical fins integrally formed therewith having at least three surface protuberances, with the dimensions of each fin being such 'that; the ratio of end thickness of the fin to fin pitch is less than 0.5, the radial length of the fin is greater than 20 mm, the thickness of the fin is on the order of 6 to 18 mm., and the fin pitch is on the order of 15 to 50 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Insulating Bodies (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US638430A 1966-05-20 1967-05-15 Self-washing insulators Expired - Lifetime US3354262A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR62402A FR1499161A (fr) 1966-05-20 1966-05-20 Perfectionnements aux ailettes d'isolateurs

Publications (1)

Publication Number Publication Date
US3354262A true US3354262A (en) 1967-11-21

Family

ID=8609110

Family Applications (1)

Application Number Title Priority Date Filing Date
US638430A Expired - Lifetime US3354262A (en) 1966-05-20 1967-05-15 Self-washing insulators

Country Status (10)

Country Link
US (1) US3354262A (cs)
AT (1) AT274093B (cs)
CS (1) CS179901B2 (cs)
DE (1) DE1615893B2 (cs)
DK (1) DK121717B (cs)
ES (1) ES340789A1 (cs)
FR (1) FR1499161A (cs)
GB (1) GB1148977A (cs)
PL (1) PL70429B1 (cs)
SE (1) SE304551B (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110060827A (zh) * 2019-05-31 2019-07-26 国网山东省电力公司临沂供电公司 复合绝缘子

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5559613A (en) * 1978-10-30 1980-05-06 Tokyo Shibaura Electric Co Gas breaker
JPS6264010A (ja) * 1985-09-13 1987-03-20 日本碍子株式会社 電気絶縁碍子
GB2406225B (en) 2003-09-18 2006-12-20 Univ Cardiff Insulating structures
ES2549171B2 (es) * 2015-05-21 2016-06-09 Universidad De La Rioja Aislador compuesto con aletas con cámara espiral

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB436397A (en) * 1934-04-10 1935-10-10 Peter Mayow Newman Improvements in or relating to high tension electric insulators
US3003022A (en) * 1958-03-07 1961-10-03 Cie Generale Electro Ceramique Finned insulator
FR1286554A (fr) * 1961-04-21 1962-03-02 Siemens Ag Isolateur à tige

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB436397A (en) * 1934-04-10 1935-10-10 Peter Mayow Newman Improvements in or relating to high tension electric insulators
US3003022A (en) * 1958-03-07 1961-10-03 Cie Generale Electro Ceramique Finned insulator
FR1286554A (fr) * 1961-04-21 1962-03-02 Siemens Ag Isolateur à tige

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110060827A (zh) * 2019-05-31 2019-07-26 国网山东省电力公司临沂供电公司 复合绝缘子

Also Published As

Publication number Publication date
DK121717B (da) 1971-11-22
PL70429B1 (cs) 1974-02-28
DE1615893B2 (de) 1978-06-15
FR1499161A (fr) 1967-10-27
ES340789A1 (es) 1968-06-16
GB1148977A (en) 1969-04-16
CS179901B2 (en) 1977-12-30
DE1615893A1 (de) 1970-06-25
SE304551B (cs) 1968-09-30
AT274093B (de) 1969-09-10

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