CA1223622A - High voltage metal-clad circuit breaker - Google Patents
High voltage metal-clad circuit breakerInfo
- Publication number
- CA1223622A CA1223622A CA000425445A CA425445A CA1223622A CA 1223622 A CA1223622 A CA 1223622A CA 000425445 A CA000425445 A CA 000425445A CA 425445 A CA425445 A CA 425445A CA 1223622 A CA1223622 A CA 1223622A
- Authority
- CA
- Canada
- Prior art keywords
- circuit breaker
- metal
- stays
- tank
- clad circuit
- 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
Links
Landscapes
- Gas-Insulated Switchgears (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
The column-shaped active part of a metal-clad circuit breaker is fastened at its upper part by stays to the metal tank. The stays show some elasticity, so as to exert a centering force on the active part and to be opposed to any excessive displacement when a shock or an earthquake occurs.
The column-shaped active part of a metal-clad circuit breaker is fastened at its upper part by stays to the metal tank. The stays show some elasticity, so as to exert a centering force on the active part and to be opposed to any excessive displacement when a shock or an earthquake occurs.
Description
2;~
The present invention relates to a high voltage metal-clad circuit breaker.
In particular, the invention relates to a high voltage metal-clad circuit breaker having an elonyated vertical metal tan]c, obturated by a top cover and filled with a high dielectric strength gas, the active part oE
the circuit breaker of column-shape be:ing placed in said tank and lying on the lower bottom of the tank by insulat-ing feet.
A metal-clad circuit breaker of the mentioned type, for example described in the U.S. Patent No. 3,895,202, can reach a height of several meters, and the oscillations resulting from a shock during the shipment or when an earth-quake occurs, can generate excessive stresses and damages of the active part located in the tank. The conventional solutions oE clamping i.t during the shipment cannot be applied when the tanks are sealed and filled with gas at the factory, and they do not solve the problems abou-t earth-quakes.
An object of the present invention is to remedy to these disadvantages and to permit the realization of a strong fixing device allowing a differential thermal expansion of the constituent parts of the circuit breaker.
According to the present invention, there is provided high voltage metal-clad circuit breaker compri-sing an elongated vertical gas tight metal tank having a top cover and a lower bottom and filled with a high die-lectric strength gas, an active part of the circuit breaker of column-shape placed in said tank and having an upper part and a lower part, insulating feet lying on the lower bottom of the tank and supporting the lower part of said active part and at least two elastic s-tays secured to the upper part of said ac-tive part and to said tank Eor exerting a radial cornponent to maintaln the ac-tive part in position.
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Preferably, the stays radially extend between the upper part of the active part and the cover, being regu-.arly distributed on the active par-t circumference.
The elasticity of the stays permits a compensa-tion of thermal expansions enough to limit the stressesexerted on the active part of the circuit breaker.
The stays number ~an be increased depending of the intensities of forecast earthquakes, the minimal number being two.
Preferably, the stays are constituted by an insulating rod ensuring the insulation between the active part of the circuit breaker and the generally grounded metal tank, the insulating rod carrying at its ends anchor parts one of which presents a set screw. The stay shows an elasticity at the compre.ssion and at the traction from a rest equilibrium position, and the adjusting device per-mits, the mounting being carried out a-t a room temperature of 15 to 20C, to exert no force on the active part of the circuit breaker. When the temperature increases or decreases the stays will be compressed or stretched but will always ensure a force to center the column.
I-t is advantageous to hinge the stays on the upper part of the active part for preventing any s-ticking of the column.
Other advantages and technical data will rnore clearly appear from the following description given as example, without limitative manner, wherein reference is made to the accompanying drawing, in which:
Fig. 1 is an axial sectional schematic view of a circuit breaker according to the invention.
; F'ig. 2 is a view on an enlarged scale of a stay according to Fig. l;
Fig. 3 is a top view, showing the two fixing stays according to Fig. l;
Fig. 4 is a view similar to the one on Fig.
The present invention relates to a high voltage metal-clad circuit breaker.
In particular, the invention relates to a high voltage metal-clad circuit breaker having an elonyated vertical metal tan]c, obturated by a top cover and filled with a high dielectric strength gas, the active part oE
the circuit breaker of column-shape be:ing placed in said tank and lying on the lower bottom of the tank by insulat-ing feet.
A metal-clad circuit breaker of the mentioned type, for example described in the U.S. Patent No. 3,895,202, can reach a height of several meters, and the oscillations resulting from a shock during the shipment or when an earth-quake occurs, can generate excessive stresses and damages of the active part located in the tank. The conventional solutions oE clamping i.t during the shipment cannot be applied when the tanks are sealed and filled with gas at the factory, and they do not solve the problems abou-t earth-quakes.
An object of the present invention is to remedy to these disadvantages and to permit the realization of a strong fixing device allowing a differential thermal expansion of the constituent parts of the circuit breaker.
According to the present invention, there is provided high voltage metal-clad circuit breaker compri-sing an elongated vertical gas tight metal tank having a top cover and a lower bottom and filled with a high die-lectric strength gas, an active part of the circuit breaker of column-shape placed in said tank and having an upper part and a lower part, insulating feet lying on the lower bottom of the tank and supporting the lower part of said active part and at least two elastic s-tays secured to the upper part of said ac-tive part and to said tank Eor exerting a radial cornponent to maintaln the ac-tive part in position.
L _ . ~
62'~
Preferably, the stays radially extend between the upper part of the active part and the cover, being regu-.arly distributed on the active par-t circumference.
The elasticity of the stays permits a compensa-tion of thermal expansions enough to limit the stressesexerted on the active part of the circuit breaker.
The stays number ~an be increased depending of the intensities of forecast earthquakes, the minimal number being two.
Preferably, the stays are constituted by an insulating rod ensuring the insulation between the active part of the circuit breaker and the generally grounded metal tank, the insulating rod carrying at its ends anchor parts one of which presents a set screw. The stay shows an elasticity at the compre.ssion and at the traction from a rest equilibrium position, and the adjusting device per-mits, the mounting being carried out a-t a room temperature of 15 to 20C, to exert no force on the active part of the circuit breaker. When the temperature increases or decreases the stays will be compressed or stretched but will always ensure a force to center the column.
I-t is advantageous to hinge the stays on the upper part of the active part for preventing any s-ticking of the column.
Other advantages and technical data will rnore clearly appear from the following description given as example, without limitative manner, wherein reference is made to the accompanying drawing, in which:
Fig. 1 is an axial sectional schematic view of a circuit breaker according to the invention.
; F'ig. 2 is a view on an enlarged scale of a stay according to Fig. l;
Fig. 3 is a top view, showing the two fixing stays according to Fig. l;
Fig. 4 is a view similar to the one on Fig.
3, showing a fastening with three stays.
On the Figures a cylindrical metal tanlc 10 is vertically disposed on a supporting frame 12. I'he -tank is tightly obturated by a top cover 14 and is Eilled with a high dielectric strength gas, such as the sulfur hexafluoride under pressure.
Inside the tank 10 is coaxially disposed a column 16 forming the active part of the circuit breaker.
The active part 16 comprises four break gaps series connec-ted and each disposed between two successive plateaux 18 connected by insulating spacers 20. The column 16 lays on the bottom 24 of the tank 10 by means of an insulating base 22. Tight bushings 26, 28, connected to the lower and upper plateaux 18 respectively, constitute the entran-ces and /
/
-2a-2~6~
outlet~ of the circuit breaker. It is u~ele~s to de~cribe More in detail suoh a circuit breaker~ whi.oh ~ormg th~ subjeot of the pre-cited U.S. Pat~n-t N 3~895~202 to whioh i-t shall be ad~an-tageou~ly referred. It is clear that the number o:~ break gap~ can be diffe-rent.
According to the present invention~ two stays 30~ 32 are anchored on the one hand to the upper plateau 18 o~ the colurnn 16, and on the other hand to the cover 14 or more exaotly to a flange 34 to fasten the cover 14, obliquely extending in a diametral plane of the tank 10. The stays 30~ 32 are identical and only one 30 of them will be described in detail referring to Fig. 2 . The s-tay 30 com-prises an insulating rod or connecting rod 36 rigidly secured at its ends to anchor parts 38~ 40. The pcart 38 is hinged by a ball 42 on a fork-joint 44 bolted on the upper plateau 18. The opposite anchor part 40 presen-ts a telescopic connection 46 constituted by a sliding fastening rod 48 coaxial by extending in a housing 50 of elastic washers 52. The fastening rod 48 carries a flange 54 inter-posed between the elas-tic washers 52, which attract the rod 48 in an equilibrium intermedia-te position. The elastic connection 46 permits a shortening and an elongation of the stay 30 agains-t the elastic forc~f springs or washers 52. The fastening rod 48 threaded at its ends is secured to a support 58 by two set nuts 569 itself secured to the flange 34. 'rhe support 58 can be fas-tened to the flange 34 by screws 59, ~ihich advan-tageously are the screws or bolts to fasten the cover 14. Thus is avoided any punc-ture of the tank 10 or coYer 14 or any additional fastening part The telescopic connection 46 is accornmodated to permit a slight rotation of the stays~ and it is useless to pro~ide for on the side of the anchor part 40 a fastening ball similar to the ball 42 of the part 38 The stay 30 obliquely extends and it is easy to see that it i~ capable of exerting a radial component on the plateau 18 of the column 16 upper part. The lnclination angle of the stay 30 is of course function of the fastening point 4~i on the upper plateau 18 and of the gap between this plateau 18 and the cover l~.
According to the invention the de~ice is brought into play according to the following manner :
The stays 30~ 32 are set before the placing of the cover 1~ and the set nutg 56 arc clamped so a~ that at a room temperatur~ of nearly 15 to 20C the telescopic connec-tion 46 i~ in the equili-brium position. In this position the stay~ 30~ 32 do not exert any force on the upper plateau 1~ and ar~ inactive. rl'he inYulation rod 36 of the stays 30~ 32 ensures the insulation be~ween the active part 16 and the metal tank 10, and the tank can be filled with sulfur hexafluoride under pressure-in the ~actory~ of course after closing the cover 14 . It is understood that, when a shock or an earthquake occurs leading for example to shift the upper part of the column 16 towards the right on ~ig. 1, the stay 30 is com pres~ed, whoreas the ~tay 32 is elongated. ~he elastic telescopic connection 46 of the stays 30, 32 work against this shortening and this elongation and exert on the plateau 18 a reaction leading to maintain the column 16 in its middle position. The reaction depends of the characteristics of the elastic ~ashers 52; which will be chosen in consequence~ Any excessive displacement capable of dama-ging the column 16 is thus avoided. It is convenient to note that a displacement of the upper plateau 18 in a plane perpendicular to the one of Fig. 1, induces an elongation of the stay~ 30, 32 and a centering reaction as it is described above. It is clear that the stays 30, ~2 exert this centering force whatever the displacement direction of the upper plateau 18. When there is a temperature variation the spacing between the upper plateau 1~ and the cover 14 varies because of the different thermal expansion~ of the tank 10 and the column 16. ~hen the upper plateau 18 moves apart from the cover 14, the stays 30~ 32 are elongated by putting the elastic connection 46 under tension. This presentation does not modify the centering force exerted by the stay~ 30, 32 when the column 16 oscillates. Tha elongation of -the stays 30~ 32 involves a rela-tive rotation permitted by the balls 42 and the el,;~tic connection 46.
The centering force obtained by two stays 30~ 32 i9 differen-t acc~r-ding cas the di~placemen-t occurs in the stays plane or in a perpen-dicular one, and it is advantageou~ to u~e a superior nwllber of " lXi~iZ2 stays, for exc~mple -three or four~ the re~llar distribu-tion being of course respected, ~ . 4 illustrate~ ag.an exaMple.a fixin~ with three stays disposed at an an~le o:f ~0. The etca~,numbers ~iill be chosen depending of the intensities of predicted ~hock~ or earth-ouakes.
The invention is not at all liMited -to the embodirrients mor0 fully described~ but on the contrar~y it ex-tend6 to any varirlnt~ in par-ticular to the one in whioh the ~st(?,y~ 30~ 32 would be consti-tuted in an elastic cast solid p.3rt~ or to the one in ~:rhich the stay~ 30, 32 ~ould extend in a radial direction.
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.
On the Figures a cylindrical metal tanlc 10 is vertically disposed on a supporting frame 12. I'he -tank is tightly obturated by a top cover 14 and is Eilled with a high dielectric strength gas, such as the sulfur hexafluoride under pressure.
Inside the tank 10 is coaxially disposed a column 16 forming the active part of the circuit breaker.
The active part 16 comprises four break gaps series connec-ted and each disposed between two successive plateaux 18 connected by insulating spacers 20. The column 16 lays on the bottom 24 of the tank 10 by means of an insulating base 22. Tight bushings 26, 28, connected to the lower and upper plateaux 18 respectively, constitute the entran-ces and /
/
-2a-2~6~
outlet~ of the circuit breaker. It is u~ele~s to de~cribe More in detail suoh a circuit breaker~ whi.oh ~ormg th~ subjeot of the pre-cited U.S. Pat~n-t N 3~895~202 to whioh i-t shall be ad~an-tageou~ly referred. It is clear that the number o:~ break gap~ can be diffe-rent.
According to the present invention~ two stays 30~ 32 are anchored on the one hand to the upper plateau 18 o~ the colurnn 16, and on the other hand to the cover 14 or more exaotly to a flange 34 to fasten the cover 14, obliquely extending in a diametral plane of the tank 10. The stays 30~ 32 are identical and only one 30 of them will be described in detail referring to Fig. 2 . The s-tay 30 com-prises an insulating rod or connecting rod 36 rigidly secured at its ends to anchor parts 38~ 40. The pcart 38 is hinged by a ball 42 on a fork-joint 44 bolted on the upper plateau 18. The opposite anchor part 40 presen-ts a telescopic connection 46 constituted by a sliding fastening rod 48 coaxial by extending in a housing 50 of elastic washers 52. The fastening rod 48 carries a flange 54 inter-posed between the elas-tic washers 52, which attract the rod 48 in an equilibrium intermedia-te position. The elastic connection 46 permits a shortening and an elongation of the stay 30 agains-t the elastic forc~f springs or washers 52. The fastening rod 48 threaded at its ends is secured to a support 58 by two set nuts 569 itself secured to the flange 34. 'rhe support 58 can be fas-tened to the flange 34 by screws 59, ~ihich advan-tageously are the screws or bolts to fasten the cover 14. Thus is avoided any punc-ture of the tank 10 or coYer 14 or any additional fastening part The telescopic connection 46 is accornmodated to permit a slight rotation of the stays~ and it is useless to pro~ide for on the side of the anchor part 40 a fastening ball similar to the ball 42 of the part 38 The stay 30 obliquely extends and it is easy to see that it i~ capable of exerting a radial component on the plateau 18 of the column 16 upper part. The lnclination angle of the stay 30 is of course function of the fastening point 4~i on the upper plateau 18 and of the gap between this plateau 18 and the cover l~.
According to the invention the de~ice is brought into play according to the following manner :
The stays 30~ 32 are set before the placing of the cover 1~ and the set nutg 56 arc clamped so a~ that at a room temperatur~ of nearly 15 to 20C the telescopic connec-tion 46 i~ in the equili-brium position. In this position the stay~ 30~ 32 do not exert any force on the upper plateau 1~ and ar~ inactive. rl'he inYulation rod 36 of the stays 30~ 32 ensures the insulation be~ween the active part 16 and the metal tank 10, and the tank can be filled with sulfur hexafluoride under pressure-in the ~actory~ of course after closing the cover 14 . It is understood that, when a shock or an earthquake occurs leading for example to shift the upper part of the column 16 towards the right on ~ig. 1, the stay 30 is com pres~ed, whoreas the ~tay 32 is elongated. ~he elastic telescopic connection 46 of the stays 30, 32 work against this shortening and this elongation and exert on the plateau 18 a reaction leading to maintain the column 16 in its middle position. The reaction depends of the characteristics of the elastic ~ashers 52; which will be chosen in consequence~ Any excessive displacement capable of dama-ging the column 16 is thus avoided. It is convenient to note that a displacement of the upper plateau 18 in a plane perpendicular to the one of Fig. 1, induces an elongation of the stay~ 30, 32 and a centering reaction as it is described above. It is clear that the stays 30, ~2 exert this centering force whatever the displacement direction of the upper plateau 18. When there is a temperature variation the spacing between the upper plateau 1~ and the cover 14 varies because of the different thermal expansion~ of the tank 10 and the column 16. ~hen the upper plateau 18 moves apart from the cover 14, the stays 30~ 32 are elongated by putting the elastic connection 46 under tension. This presentation does not modify the centering force exerted by the stay~ 30, 32 when the column 16 oscillates. Tha elongation of -the stays 30~ 32 involves a rela-tive rotation permitted by the balls 42 and the el,;~tic connection 46.
The centering force obtained by two stays 30~ 32 i9 differen-t acc~r-ding cas the di~placemen-t occurs in the stays plane or in a perpen-dicular one, and it is advantageou~ to u~e a superior nwllber of " lXi~iZ2 stays, for exc~mple -three or four~ the re~llar distribu-tion being of course respected, ~ . 4 illustrate~ ag.an exaMple.a fixin~ with three stays disposed at an an~le o:f ~0. The etca~,numbers ~iill be chosen depending of the intensities of predicted ~hock~ or earth-ouakes.
The invention is not at all liMited -to the embodirrients mor0 fully described~ but on the contrar~y it ex-tend6 to any varirlnt~ in par-ticular to the one in whioh the ~st(?,y~ 30~ 32 would be consti-tuted in an elastic cast solid p.3rt~ or to the one in ~:rhich the stay~ 30, 32 ~ould extend in a radial direction.
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Claims (8)
1. High voltage metal-clad circuit breaker com-prising an elongated vertical gas tight metal tank having a top cover and a lower bottom and filled with a high die-lectric strength gas, an active part of the circuit breaker of column-shape placed in said tank and having an upper part and a lower part, insulating feet lying on the lower bottom of the tank and supporting the lower part of said active part and at least two elastic stays secured to the upper part of said active part and to said tank for exerting a radial component to maintain the active part in position.
2. Metal-clad circuit breaker according to claim 1, wherein said stays are anchored on the one hand to the upper part of the active part and on the other hand to the inner side of the cover of the tank.
3. Metal-clad circuit breaker according to claim 2, having bolts to fasten said cover to said tank, said stays being anchored to said bolts.
4. Metal-clad circuit breaker according to claim 1, wherein the circuit breaker comprises at least three stays regularly distributed on the active part.
5. Metal-clad circuit breaker according to claim 1, wherein each of said stays comprises an insulating con-necting rod and two anchor terminal parts, said stay showing an elasticity under compression and traction.
6. Metal-clad circuit breaker according to claim 5, wherein one of said terminal parts forms a telescopic connection biased in an inactive intermediate position.
7. Metal-clad circuit breaker according to claim 6, wherein said one terminal part comprises a rod with a stop and two springs mounted in opposition and on both sides of said stop.
8. Metal-clad circuit breaker according to claim 1, wherein each stay is pivotally mounted on the upper part of said active part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000425445A CA1223622A (en) | 1983-04-07 | 1983-04-07 | High voltage metal-clad circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000425445A CA1223622A (en) | 1983-04-07 | 1983-04-07 | High voltage metal-clad circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1223622A true CA1223622A (en) | 1987-06-30 |
Family
ID=4124962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000425445A Expired CA1223622A (en) | 1983-04-07 | 1983-04-07 | High voltage metal-clad circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1223622A (en) |
-
1983
- 1983-04-07 CA CA000425445A patent/CA1223622A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |