EP0688025B1 - Hochspannungsisolator aus Keramik - Google Patents

Hochspannungsisolator aus Keramik Download PDF

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Publication number
EP0688025B1
EP0688025B1 EP95108162A EP95108162A EP0688025B1 EP 0688025 B1 EP0688025 B1 EP 0688025B1 EP 95108162 A EP95108162 A EP 95108162A EP 95108162 A EP95108162 A EP 95108162A EP 0688025 B1 EP0688025 B1 EP 0688025B1
Authority
EP
European Patent Office
Prior art keywords
voltage insulator
cap
insulator according
thickened
insulator
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
EP95108162A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0688025A2 (de
EP0688025A3 (enrdf_load_stackoverflow
Inventor
Martin Kuhl
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.)
Ceramtec GmbH
Original Assignee
Ceramtec GmbH
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 Ceramtec GmbH filed Critical Ceramtec GmbH
Publication of EP0688025A2 publication Critical patent/EP0688025A2/de
Publication of EP0688025A3 publication Critical patent/EP0688025A3/xx
Application granted granted Critical
Publication of EP0688025B1 publication Critical patent/EP0688025B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01B17/14—Supporting insulators
    • H01B17/16—Fastening of insulators to support, to conductor, or to adjoining insulator
    • 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

Definitions

  • High-voltage insulators made of ceramic materials are used mainly in outdoor switchgear and overhead lines. They consist of one elongated insulating body, which is equipped with screens for the Formation of a crawl path that adapts to the atmospheric conditions is. The shields are molded onto the insulator trunk, the thickness of which is determined by the mechanical requirements is determined. At the ends of the insulator or the isolator trunk there are metal caps over which the Power is transmitted from the isolator trunk to further components. High voltage insulators are usually designed to be rotationally symmetrical, if apart from the asymmetry of the caps, for example by individual webs becomes; the isolator caps concentrically surround the ends of the isolator trunk.
  • DE 696 142 teaches an insulator in which metal caps are shrunk on the ground insulator ends are attached. The edge of the caps shows one weakened wall thickness to create compliance.
  • the invention is therefore based on the object to create high voltage insulator made of ceramic material that is precise Has dimensions and maintains them, easy and quick to reinforce and where there are no chemical reactions between the Material components occur. Furthermore, the mechanical strength of the Insulator material with the smallest possible clamping length of the insulator ends in the Metal caps are fully utilized.
  • a rotationally symmetrical high-voltage insulator made of a ceramic material with shrink caps attached to the ends, which is characterized in that the diameter D of the ends is thickened by at least 1.05 times compared to the shank diameter d that the thickened ends cylindrical and frontal to a roughness R a of 0.5 to 30 microns are mechanically processed, that the height H of the cap is greater than the height h of the end and that radial stresses> 40 N / mm 2 in the area of the connection point between the thickened ends and the cap occur.
  • the metal cap With its cap end facing the insulator body, the metal cap can protrude beyond the thickened insulator end and have a stop on its end face which is supported on the end face of the insulator end.
  • a glazed channel and a phase of at least 1.5 mm high, preferably 2-5 mm high, can be provided between the metal cap and the insulator trunk and on the end faces of the insulator ends.
  • the thickened, mechanically processed insulator end and the inner surfaces of the metal caps can have a roughness R a of 0.5-100 ⁇ m, preferably 0.8-30 ⁇ m, particularly preferably 1-10 ⁇ m, and the channel can be filled with a sealant, for example silicone rubber.
  • the metal caps can be provided with flanges which have a groove for receiving a seal.
  • Metal caps can consist of cast aluminum, wrought aluminum alloys, corrosion-resistant steel materials or steel and cast materials with corrosion-protective surface coatings. Porcelain, ceramics containing aluminum oxide, zirconium silicate, cordierite and steatite materials are particularly suitable as ceramic materials.
  • the advantages of the invention are essentially in the simple joining technique, the dimensional accuracy and the reproducibility of the mechanical load values of high-voltage insulators, especially hollow insulators. For the latter has the advantage of easier sealing.
  • Alumina porcelain was used to produce glazed, rotationally symmetrical test specimens 1 with thickened, mechanically machined ends 3, so-called shoulder bars.
  • the rod diameter d was 75 mm, the diameter D of the ends 3 95 mm.
  • the metal caps 2 consisted of a wrought aluminum alloy.
  • the ends 3 of the rods 1 were ground on the circumference and the end face after the fire and had a roughness R a of 1,3-2,5 ⁇ m.
  • the roughness R a of the metal caps 2 in the recess 6 was 1.2-1.5 ⁇ m.
  • the diameter of the recess 6 was smaller than the diameter D of the ends 3; their height H was 65 mm and the height h of the ends 3 60 mm, whereby a groove 7 is formed between the cap and the rod.
  • the metal caps were heated to 250 ° C, then placed on the ends of the rods and cooled to 25 ° C, whereby a metal-ceramic connection is formed by shrinking. Depending on the cap dimensions, a radial stress results in the ceramic, which can be calculated.
  • test specimens were subjected to a tensile test, the tensile forces F z acting in the direction of the arrow. Fracture values between 190 and 230 kN resulted, which corresponds to a tensile strength of the ceramic material of 43-52 N / mm 2 . These test specimens were always broken in the region of the channel 7, ie in the region of the transition from the trunk 8 to the thickened trunk end 3.
  • the test specimens were subjected to a bending strength test, the bending forces F B acting in the direction of the arrow and the relationship between radial stress and bending strength shown in FIG. 3.
  • the strength values between 50 and 100 N / mm 2 come from test specimens, the breaking point of which is in the area of the shoulder 5 of the channel 7.
  • the low strength values ( ⁇ 20 N / mm 2 ) can be attributed to broken windows within the metal cap 2.
  • FIG. 3 shows a clear connection between bending strength and radial stress in the area of the connection point, without scattering, as observed in the prior art.
  • FIG. 3 also shows that radial stresses which are> 40 N / mm 2 are required for the technically interesting bending strengths. Investigations in the temperature range from -25 ° C to + 1 25 ° C, that is, a temperature interval of 150 ° confirmed the reproducibility of the measuring points in Figure 3, whereby a radial tension of 60N / mm 2 was not undercut. It could thus be shown that shrink-fit metal caps on the ends of high-voltage insulators according to the features of the invention can also be used outdoors, where temperature differences in extreme climatic regions of up to 100 ° C. can be expected.
  • the trunk 8 is included molded shields 4 provided.
  • the end 3 of the insulating body has one larger diameter D than the diameter d of the stem 8.
  • the Metal cap 2 preferably made of an aluminum alloy or stainless steel existing, is with radial tension on the ground end 3 of Insulated body arranged.
  • the metal cap 2 can with a circumferential Stop 9 are provided, which in the reinforcement of the insulating body on the End face of the end 3 of the insulating body rests. This way, a precise connection dimension of the isolator reached.
  • the assembly of the metal caps 2 is very simple. The heated metal caps are simply on the ends of the insulator and then cool down in a few seconds until that the isolator can be handled immediately. After about 30 minutes you can the isolator can already be checked mechanically without setting the Metal caps occurs.
  • the roughness of the joining surfaces of the shrink fit is of great importance, since the removal of the cap as a result of mechanical stress does not only depend on the radial tension in the shrink fit but also on the coefficient of friction between the joining surfaces.
  • a roughness R a of 1-10 ⁇ m has been found to be particularly advantageous in the aluminum / porcelain pairing.
  • Also of great importance in the case of hollow insulators is the sealing of components which are fastened to the porcelain hollow insulator. It has been shown that the roughness of the aluminum / porcelain pairing is 1-10 ⁇ m water- and gas-tight, so that seals 10 can also be arranged in a groove 13 in the flange 11 of the metal cap 2 (FIG. 4). However, seals 10 can also be arranged according to FIG. 5 on the end face of the end 3 of the insulating body.
  • the end 3 it is advisable, as shown in FIG. 5, for the end 3 to provide the insulating body with a chamfer 12 of at least 1.5 mm in height, which is an angle of 2-45 degrees, especially 5-30 degrees with the Isolator axis.
  • the glazed channel 7 forms because of its notch effect with high mechanical Stress a predetermined breaking point. Since the location of the predetermined breaking point from Overhang of the cap 2 depends, it is advisable the channel 7 as flat as possible to be designed and provided with a radius on the insulator trunk.

Landscapes

  • Insulators (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Electrostatic Separation (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Discharge Heating (AREA)
  • Organic Insulating Materials (AREA)
  • Insulating Bodies (AREA)
  • Cable Accessories (AREA)
EP95108162A 1994-06-17 1995-05-29 Hochspannungsisolator aus Keramik Expired - Lifetime EP0688025B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4421343A DE4421343A1 (de) 1994-06-17 1994-06-17 Hochspannungsisolator aus Keramik
DE4421343 1994-06-17

Publications (3)

Publication Number Publication Date
EP0688025A2 EP0688025A2 (de) 1995-12-20
EP0688025A3 EP0688025A3 (enrdf_load_stackoverflow) 1996-01-10
EP0688025B1 true EP0688025B1 (de) 1998-08-05

Family

ID=6520910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95108162A Expired - Lifetime EP0688025B1 (de) 1994-06-17 1995-05-29 Hochspannungsisolator aus Keramik

Country Status (8)

Country Link
US (1) US5977487A (enrdf_load_stackoverflow)
EP (1) EP0688025B1 (enrdf_load_stackoverflow)
JP (1) JPH087684A (enrdf_load_stackoverflow)
AT (1) ATE169422T1 (enrdf_load_stackoverflow)
BR (1) BR9502815A (enrdf_load_stackoverflow)
CA (1) CA2152029A1 (enrdf_load_stackoverflow)
DE (2) DE4421343A1 (enrdf_load_stackoverflow)
ZA (1) ZA954979B (enrdf_load_stackoverflow)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765385B1 (fr) * 1997-06-26 2003-12-05 Gec Alsthom T & D Sa Ferrure d'isolateur composite
IT1299049B1 (it) * 1998-04-08 2000-02-07 Abb Research Ltd Isolatore particolarmente per linee elettriche di trasmissione e distribuzione, avente caratteristiche migliorate di resistenza alle
US6229094B1 (en) * 1998-11-16 2001-05-08 Hubbell Incorporated Torque prevailing crimped insulator fitting
AU4278501A (en) * 2000-03-29 2001-10-08 Ngk Insulators, Ltd. Method for manufacturing polymer insulator and its end part machining apparatus
US6367774B1 (en) 2000-04-19 2002-04-09 Flowserve Corporation Element having ceramic insert and high-strength element-to-shaft connection for use in a valve
US6522256B2 (en) * 2000-05-16 2003-02-18 Southern Electric Equipment Hybrid current and voltage sensing system
JP4376174B2 (ja) * 2004-12-01 2009-12-02 日本碍子株式会社 ポリマーｓｐ碍子
ATE521070T1 (de) * 2007-05-23 2011-09-15 Abb Technology Ag Hochspannungsisolator und kühlelement mit diesem hochspannungsisolator
CA2861098C (en) * 2012-01-13 2017-04-04 Siemens Aktiengesellschaft Method of manufacture of porcelain insulator structures and method and assembly for affixing metal flanges to porcelain insulators
EP2637180A1 (en) * 2012-03-06 2013-09-11 ABB Technology Ltd A post insulator
CN102689745B (zh) * 2012-05-14 2015-05-13 平高集团有限公司 柱形绝缘子的包装结构及包装方法
CN105914674B (zh) * 2016-06-07 2018-04-03 浙江华蕴海洋工程技术服务有限公司 一种电缆保护管
CN111599543B (zh) * 2020-06-29 2021-07-23 江西省萍乡电瓷电器厂 一种高度可调的绝缘子
CN115497697B (zh) * 2022-10-21 2025-03-14 江苏南瓷绝缘子股份有限公司 一种特高压输电线路用耐腐蚀悬式绝缘子
WO2025068744A1 (en) * 2023-09-27 2025-04-03 Asasoft (Canada) Inc Galvanized line insulators

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1031453A (en) * 1910-09-27 1912-07-02 Clouth Rhein Gummiwarenfabrik Insulator.
US1769262A (en) * 1926-06-30 1930-07-01 Condit Electrical Mfg Corp Oil-filled bushing
DE696142C (de) * 1936-05-24 1940-09-14 Porzellanfabrik Kahla Isolator, insbesondere Vollkernisolator, mit durch befestigten Metallkappen
US2924644A (en) * 1953-04-20 1960-02-09 Cox John Edward Electrical insulator links
DE1130024B (de) * 1957-11-15 1962-05-24 Siemens Ag Befestigung von Metallarmaturen an keramischen Isolatoren
GB1009571A (en) * 1961-03-01 1965-11-10 Pilkington Brothers Ltd Improvements in or relating to electrical insulators
GB8312892D0 (en) * 1983-05-11 1983-06-15 Raychem Ltd Electrical insulator
DE3643651A1 (de) * 1986-12-17 1988-06-30 Steuer Mess Regel Armaturen Gm Verfahren zum herstellen einer schrumpfverbindung zwischen mindestens zwei werkstuecken aus materialien unterschiedlicher ausdehnungskoeffizienten
JP2664616B2 (ja) * 1993-03-25 1997-10-15 日本碍子株式会社 ノンセラミック碍子の気密構造

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELEKTROKERAMIK, A. HECHT,1976,SEITEN 144-147,158/9,162-177, 188-191. *

Also Published As

Publication number Publication date
ATE169422T1 (de) 1998-08-15
CA2152029A1 (en) 1995-12-18
DE4421343A1 (de) 1995-12-21
US5977487A (en) 1999-11-02
ZA954979B (en) 1996-02-21
JPH087684A (ja) 1996-01-12
EP0688025A2 (de) 1995-12-20
EP0688025A3 (enrdf_load_stackoverflow) 1996-01-10
DE59503054D1 (de) 1998-09-10
BR9502815A (pt) 1996-02-06

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