SE423942B - GAS INSULATED HIGH VOLTAGE DEVICE CONTAINING A POWER CONDUCTOR SUPPLIED BY AT LEAST ONE STUD ISOLATOR - Google Patents
GAS INSULATED HIGH VOLTAGE DEVICE CONTAINING A POWER CONDUCTOR SUPPLIED BY AT LEAST ONE STUD ISOLATORInfo
- Publication number
- SE423942B SE423942B SE7909002A SE7909002A SE423942B SE 423942 B SE423942 B SE 423942B SE 7909002 A SE7909002 A SE 7909002A SE 7909002 A SE7909002 A SE 7909002A SE 423942 B SE423942 B SE 423942B
- Authority
- SE
- Sweden
- Prior art keywords
- insulator
- ring
- metal
- housing
- metal ring
- Prior art date
Links
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
Landscapes
- Insulators (AREA)
- Insulating Bodies (AREA)
Description
1 10 15 20 25 §O 7909002-5 1; ex 1313343 20 50 769). En sådan skärm försvagar dock isolatorns mekaniska hâllfasthet i det mest stressade området. I utförandet enligt fig 1 utan skärmen 10 är spänningshållfastheten känslig för defekter eller andra störningar (t ex lösa partiklar) på. elektrodytan intill kontaktlinjeræla 6, 7 med isolatorn. 1 10 15 20 25 §O 7909002-5 1; ex 1313343 20 50 769). However, such a screen weakens the mechanical strength of the insulator in the most stressed area. In the embodiment according to Fig. 1 without the screen 10, the voltage strength is sensitive to defects or other disturbances (eg loose particles) on. the electrode surface adjacent to contact line rails 6, 7 with the insulator.
En förbättring av ovannämnda förhållanden uppnås genom att i isolatorns periferi gjuta in en metallring som får utgöra bärorgan för isolatorn, varvid isolatorns ytterdiameter göres mindre än kapslingens irmerdiameter.An improvement of the above-mentioned conditions is achieved by molding into the periphery of the insulator a metal ring which may constitute support means for the insulator, whereby the outer diameter of the insulator is made smaller than the inner diameter of the enclosure.
Ett problem vid utformning av gjuthartsisolatorer med ingjuten metallring är att hartset har större termisk utvidgaingskoefficient än ringen.A problem in designing casting resin insulators with a cast metal ring is that the resin has a greater coefficient of thermal expansion than the ring.
Skillnaden kan åtminstone delvis elimineras genom hög halt av fyllmedel i epoxin, men massan blir då svårgjuten. Ett annat sätt är att utforma ringen så att epoxin får ett grepp om ringen eller binder effektivt till dess yta, varvid utvidgningsskillnaden tas upp av elastisk tänjning av epoxim-Detta leder dock till mekanisk stress, som försvagar konstruktionen.The difference can be at least partially eliminated by a high content of filler in epoxy, but the pulp then becomes difficult to cast. Another way is to design the ring so that the epoxy gets a grip on the ring or binds effectively to its surface, whereby the difference in expansion is taken up by elastic stretching of the epoxy. However, this leads to mechanical stress, which weakens the construction.
Det har även föreslagits att som material i ringen använda ett elektriskt- ledande elastiskt material, exempelvis grafitfylld epoxi e dyl (US patent- skriften 4 029 892), men en sådan konstruktion har otillräcklig mekanisk hållfasthet vid tryckdifferenser över isolatorn. ' Ändamålet med föreliggande uppfinning är att åstadkomma en gasisolerad högspäzmingsanordning av i ingressen till patentlccav 1 angivet slag, som inte är behäftad med ovan nämnda svagheter. Detta uppnås genom de i känne- tecknande delen av patentlcrav 1 angivna åtgärderna.It has also been proposed to use as the material in the ring an electrically conductive elastic material, for example graphite-filled epoxy and the like (U.S. Pat. No. 4,029,892), but such a construction has insufficient mechanical strength at pressure differences across the insulator. The object of the present invention is to provide a gas-insulated high-voltage device of the type specified in the preamble of patent claim 1, which is not encumbered with the above-mentioned weaknesses. This is achieved by the measures specified in the characterizing part of patent 1.
Ett utföringsexempel av uppfinningen skall närmare beskrivas i anslutning till ritningens fig 2, varvid samtidigt uppfinningens fördelar och lämpliga vidareutvecklingar av denna skall beskrivas.An embodiment of the invention will be described in more detail in connection with Fig. 2 of the drawing, at the same time the advantages of the invention and suitable further developments thereof will be described.
Fig 2 visar i axialsnitt hur en konisk isolator 11, som uppbär en ej visad central strömledare, är irxfäst i en rörformig jordad metallkapsling 4. Iso- latorn 11, vars ytterdiameter är mindre än kapslingens innerdiameter, är utförd av t ex epoxiharts med en isolatorn omslutande och i isolatorn in- gjuten metallring 12, som utgör bärorgan för isolatorn. Metallringens 12 inre del 13 är utformad som skärmelektrod och tjänar dessutom som säte för isolatorn 11, medan metallringens yttre del 14 är inklämd mellan kapslingens flänsar 2 och 3. 10 15 20 25 79090 02-'3 3 Vid det i fig 2 visade utförandet har de lccitiska kontalctlinjerna mellan isolator och elektrod flyttats till lägen 15, 16 där risken för störningar är väsentligt lägre än vid utförandet enligt fig 1 och där kapslingoytan tillsammans med skärmringen 12 ger effektiv fältavlastning, såsom frzungår av den med 17 beteclmade ekvipotentiallinjen. 'Den tidigare kritiska rund- ningen av kapslirzgsflänsarnas kanter 8 (fig 1) kan nu slopas helt. I det nya utförandet försvagas dessutom inte isolatorn av skärmringen eftersom böj- och skjuvpålcänriingarna i det tidigare utförandet nu, vid övertryck på. den konvexa sidan, ersätts av tryckpålëmiing, för vilket materialet har mycket större hållfasthet, speciellt vid långtidsbelastning.Fig. 2 shows in axial section how a conical insulator 11, which carries a central conductor (not shown), is fixed in a tubular earthed metal housing 4. The insulator 11, the outer diameter of which is smaller than the inner diameter of the housing, is made of e.g. epoxy resin with an insulator enclosing and metal ring 12 molded into the insulator, which constitutes support means for the insulator. The inner part 13 of the metal ring 12 is designed as a shield electrode and also serves as a seat for the insulator 11, while the outer part 14 of the metal ring is clamped between the flanges 2 and 3 of the housing. the lcitic contact lines between insulator and electrode have been moved to positions 15, 16 where the risk of interference is significantly lower than in the embodiment according to Fig. 1 and where the enclosure surface together with the shield ring 12 provides effective field relief, such as the 17-point equipotential line. The previously critical rounding of the edges 8 of the capsule flanges (Fig. 1) can now be completely eliminated. In the new embodiment, moreover, the insulator is not weakened by the shield ring because the bending and shear pile changes in the previous embodiment now, at overpressure on. the convex side, is replaced by pressure padding, for which the material has much greater strength, especially at long-term loading.
Ringen kan vara helt symmetrisk eller göras osymmetrisk enligt fig 2 dels för att ge stor kontalctyta mot isolatorn vid övertryck från den konvexa. sidan 18 utan att isolatorns tjocklek minskas i snitt A-A, där stort moment råder vid över-tryck från konkava sidan 19, dels för att förbättra fältav- lastningen vid kontaktlinjen mellan isolator och ring på. den mot ísolator- konan vända sidan.The ring can be completely symmetrical or made asymmetrical according to Fig. 2 partly to give a large contact surface against the insulator in case of overpressure from the convex one. page 18 without reducing the thickness of the insulator in section A-A, where large torque prevails at overpressure from concave side 19, partly to improve the field relief at the contact line between the insulator and the ring on. the side facing the insulator cone.
Ringen 12 är utformad medanpassad lutning d på sidoytorna 20, 21, så. att epoxin glider p! dessa. utan att mekaniska spänningar uppstår - vid utvidgningsskillnad. Därvid uppstår visserligen en spalt 22 mellan metallring och epoxi, som kan orsaka. glimning, men risken för glimrling kan elimineras genom att spalten fylls med isolergas genom dränering t ex via ringen eller fogen till omgivande gasrum eller genom att epoxiytan görs ledande, varvid spalten blir fältfri.The ring 12 is formed while fitting slope d on the side surfaces 20, 21, so. that epoxy slides on! these. without mechanical stresses arising - in the event of a difference in expansion. Admittedly, this creates a gap 22 between the metal ring and the epoxy, which can cause. glitter, but the risk of glitter can be eliminated by filling the gap with insulating gas by draining, for example via the ring or joint to the surrounding gas space or by making the epoxy surface conductive, whereby the gap becomes field-free.
Epoxiytan innanför metallringen kan göras ledande genom att ett ledande skikt läggs på metallringen t ex genom metallsprutning eller målning (t ex med en grafitlösning), innan denna gjuts in i epoxin. Ringens yta förbe- handlas, t ex genom lätt slipning, så. att det ledande skiktet får begränsad vidhäftning och följer epoxiytan dä. spalten uppstår.The epoxy surface inside the metal ring can be made conductive by applying a conductive layer to the metal ring, for example by metal spraying or painting (eg with a graphite solution), before this is cast into the epoxy. The surface of the ring is pretreated, for example by light grinding, so. that the conductive layer has limited adhesion and follows the epoxy surface then. the gap arises.
Claims (4)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7909002A SE423942B (en) | 1979-10-31 | 1979-10-31 | GAS INSULATED HIGH VOLTAGE DEVICE CONTAINING A POWER CONDUCTOR SUPPLIED BY AT LEAST ONE STUD ISOLATOR |
DE19808027907 DE8027907U1 (en) | 1979-10-31 | 1980-10-18 | Post insulator made of hardenable plastic |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7909002A SE423942B (en) | 1979-10-31 | 1979-10-31 | GAS INSULATED HIGH VOLTAGE DEVICE CONTAINING A POWER CONDUCTOR SUPPLIED BY AT LEAST ONE STUD ISOLATOR |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7909002L SE7909002L (en) | 1981-05-01 |
SE423942B true SE423942B (en) | 1982-06-14 |
Family
ID=20339204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7909002A SE423942B (en) | 1979-10-31 | 1979-10-31 | GAS INSULATED HIGH VOLTAGE DEVICE CONTAINING A POWER CONDUCTOR SUPPLIED BY AT LEAST ONE STUD ISOLATOR |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE8027907U1 (en) |
SE (1) | SE423942B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3906553A1 (en) * | 1989-03-02 | 1990-09-06 | Asea Brown Boveri | Screening electrode |
DE4007335A1 (en) * | 1990-03-08 | 1991-09-12 | Asea Brown Boveri | Electrical insulator sepg. inner from grounded outer conductors - comprises plastic cpd. with inert filler and has embedded ring shaped regions with higher dielectric constant to modify field |
DE4015929A1 (en) * | 1990-05-17 | 1991-11-21 | Asea Brown Boveri | Gas insulated HV installation isolator - has at least one field control element of electrically conductive plastic coupled by moulding onto insulator body |
DE4034733A1 (en) * | 1990-10-30 | 1992-05-07 | Siemens Ag | SINGLE POLE GASI-INSULATED PIPE CHANNEL |
-
1979
- 1979-10-31 SE SE7909002A patent/SE423942B/en not_active IP Right Cessation
-
1980
- 1980-10-18 DE DE19808027907 patent/DE8027907U1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE8027907U1 (en) | 1981-02-26 |
SE7909002L (en) | 1981-05-01 |
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