CA1108254A - Vertical electric busbar with circulatory cooling system - Google Patents
Vertical electric busbar with circulatory cooling systemInfo
- Publication number
- CA1108254A CA1108254A CA293,913A CA293913A CA1108254A CA 1108254 A CA1108254 A CA 1108254A CA 293913 A CA293913 A CA 293913A CA 1108254 A CA1108254 A CA 1108254A
- Authority
- CA
- Canada
- Prior art keywords
- busbar
- refrigerant
- circulatory system
- duct
- condensing means
- 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
Abstract
ABSTRACT
An electric busbar installation comprises a sub-stantially rigid tube arranged with its axis substantially vertical at least one busbar comprising a rigid bare elongate conductor housed within and insulated from the rigid tube, at least one duct which is in thermal association with the elongate conductor throughout the length of the busbar and which forms part of a closed circulatory system for evaporable refrigerant, and interconnected in the circulatory system, condensing means for receiving evaporated refrigerant from, and for delivering liquid refrigerant to, the duct. Artificial cooling of the busbar is effected by extraction from the elongate conductor of the heat generated by the busbar when it is on load, which heat raises the temperature of the elongate conductor to such an extent as to evaporate liquid refrigerant being caused to flow along the duct to the condensing means where it is cooled and condensed to liquid form for re-circula-tion along the duct.
An electric busbar installation comprises a sub-stantially rigid tube arranged with its axis substantially vertical at least one busbar comprising a rigid bare elongate conductor housed within and insulated from the rigid tube, at least one duct which is in thermal association with the elongate conductor throughout the length of the busbar and which forms part of a closed circulatory system for evaporable refrigerant, and interconnected in the circulatory system, condensing means for receiving evaporated refrigerant from, and for delivering liquid refrigerant to, the duct. Artificial cooling of the busbar is effected by extraction from the elongate conductor of the heat generated by the busbar when it is on load, which heat raises the temperature of the elongate conductor to such an extent as to evaporate liquid refrigerant being caused to flow along the duct to the condensing means where it is cooled and condensed to liquid form for re-circula-tion along the duct.
Description
2~
This invention relates to-electric busbar installations and is particularly concerned ~ith artificial cooling of electric busbar install-ations of the kind in which each busbar is arranged with its axis substan-tially vertical and ~hich, for example, may be employed in electric power statians, mines and multi-storey buildings.
According to the present invention an improved electric busbar installation comprises a substantially-rigid tube arranged with its axis substantially vertical, at least one busbar comprising a substantially rigid bare elongate conductor housed within and insulated from said rigid tube of fluid-impermeable material, at least one duct which is in thermal association with the elongate conductor throughout the length of the busbar and which forms part of a closed circulatory system ~or evaporable refrigerant, and interconnected in the clrculatory system, condensing means for receiving evaporated refrigerant from, and for delivering liquid refrigerant to, the duct, the arrangement being such that when the closed circulatory system is sealed and before the busbar installation is put on load, the refrigerant is stationary and the duct thermally associated with the or each elongate conductor is substantially filled with liquid refrigerant and that, when the busbar instal:Lation is on load, artificial cooling of the busbar is effected by extraction from the elongate conductor of the heat generated by the busbar, which heat raises the temperature of the elongate conductor to such an extent as to evaporate liquid refrigerant being caused to flow along the duct to the condensing means where it is cooled and condensed to liquid form for re-circulation along the duct.
Preferably the or each substantially rigid bare elongate conductor is in the -form of a tube and the bore of the tube constitutes the duct in thermal association with the elongate conductor but, in some circumstances, ~. ~ :,, - . ~ ,.. .
-:: ~
the duct in thermal association ~ith the or each elongate concluctor may be the bore o the substantially -2a-.` ~
:., . ..... ' . . ; ., .; ; ~ .: ~
.: , . ~. , ~ , :
rigid tube in which the or each elongate conductor is housed. In this latter case, the evaporable refrigerant will have electrically insulating properties and the substanti-ally rigid tube will be of fluid-impermeable material.
Preferably refrigerant flows to the condensing means thermosyphonically and liquid refrigerant flows from the condensing means under the action of gravity.
Artificial cooling of the elongate conductor of - the or each busbar of an electric busbar installation by evaporation of a liquid refrigerant in thermal association with the conductor has the important advantage that the evaporative cooling is self-regulating and will come into operation automatically when the temperature of the con-ductor exceeds the temperature of the condensing means.
Where a busbar installation is of great length, the length of the or each busbar may be sub-divided into ; sections and each of these sections may have its own separate closed circulatory system for evaporable refri-gerant. In this case, the closed circulatory system of each section of the busbar will have its own condensing means and refrigerant reservoir.
In some circumstances, each of two or more busbars, or a section of each of two or more busbars, may be cooled by a common closed circulatory system for evaporative refrigerant.
In an alternative arrangement sections of the bus-bar or of each of two or more busbars, may be cooled by a ~ -:
common closed circulatory system for evaporable refrigerant having a single condensing means, The duct of each of these sections of the busbar or of each busbar is fed with evaporable refrigerant from an associated refrigerant ... .
~,~
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_ Ll _ , reservoir, each reservoir except that reservoir remote from the condensing means being connected to a succeeding reser-voir in the closed circulatory system by an overflow pipe.
The refrigerant reservoir of each section of the or a bus-bar, except the section remote from the condensing means,may be constituted by the part of the circulatory system extending between the section and the overflow pipe.
It is preferred to employ as tha condensing means air-cooled or water-cooled heat exchangers and, where the busbar installation is housed in an underground shaft, the ~, . . .
condensing means can be conveniently located above ground.
Suitable evaporable refrigerants that may be employed include carbon tetrachloride, methyl chloride, ; ammonia, methanol, a hydrocarbon, e.g. C3H8, C4Hlo~ C5Hl2, and a fluorocarbon, e.g. CHClF2.
The invention is further illustrated by a descrip-tion, by way of example, of three forms of electric busbar installation with reference to the accompanying drawings, in which~
Figures 1, 2 and 3 are transverse cross-sectional views illustrating three alternative arrangements of rigid conductors in a busbar installation;
Figure 4 shows, diagrammatically, the arrangement ;~ for artificially cooling one section of one busbar of an isolated phase busbar installation housed underground in a substantially vertical shaft; and Figures 5 and 6, respectively, show diagramatically - two alternative arrangements for artificially cooling one busbar of an isolated busbar installation housed under-ground in a substantially vertical shaft.
Figure 1 shows an isolated phase busbar installa-,, '' ~- ~' ~' .
tion comprising three rigid metal tubes 1 in each of which is housed a substantially rigid bare elongate tubular con-ductor 2, each tubular conductor being secured to and insulated from the tube in which it is housed at spaced positions along the tube by rigid insulators 3. The bore 4 of the tubular conductor 2 constitutes the duct through which the evaporable refrigerant is caused to flow for artificially cooling the busbar.
In an alternative form of isolated phase busbar installation shown in Figure 2~ each of three rigid metal tubes 11 houses a substantial].y rigid elongate condu-ctor 12, each conductor being secured to and insulated ~rom the tube in which it is housed at spaced positions along the tube by rigid insulators.
The space 14 between each conduct3r 12 and its surrounding tube 11 constitutes the duct through which flows evaporable refrigerant with electrical insulating properties.
In the busbar installation shown in Figure 3,three rigid conductors 22 are housed in a common metal tube 21, ; the conductors being secured to and insulated from the tube by rigid insulators 23. Evaporable electrical insulating ~` refrigerant flows in the space 24 between the conductors 22 and the tube 21 Referring to Figure 4, each busbar of the isolated phase busbar installation is housed underground in a sub-stantially vertical shaft, 200 m in length, and dissipates ` 300 W/m when on full load. Each busbar is divided along its length into substantially fluid-tlght sections, of which one section 32 only is diagramatically illustrated, and each section has its own separate closed circulatory -- 6 ~
system 31 for evaporable refrigerant, the closed circulatory system of each section having its own condensor 35 and refrigerant reservoir 37. Thus, in Figure 4, the upper end of the section 32, of length 30 m, of the hollow conductor of one busbar is connected via an electrically insulating coupling 33 to a pipe 34 connected to the condensor 35 located above the ground. Exbending downwardly from the condensor 35 is a pipe 36 which is connected to the re-frigerant reservoir 37 located 170 m below ground level.
~10 The reservoir 37 is connected by a pipe 38 via an electric-- ally insulating coupling 39 to the lower end of the section 32. The section 32~ condensor 35, reservoir 37 and inter-connecting pipes 34, 36 and 38 constitute the closed cir-culatory system 31 for evaporable refrigerant.
If this busbar installation were to be cooled by forced water circulation, a static pressure of 2B4 p.s.i.g.
would be required, which is excessive. Each vertically-extending busbar could be divided into sections, e.g. of 30 m length, and each section cooled separately by forced water circulation, but heat dissipated at each of the ; ~ sections would have to be removed to ground level and this , . . .
~ would necessitate the provision of a secondary cooling , oircuit, e.g. using forced air circulation, with the result that artificial cooling of the busbar installation by this "
means is complicated and expensive.
In contradistinction, if, as diagrammatically , illustrated in Figure 4, each section 32 of each isolated phase busbar is cooled by arranging for evaporable re-frigerant to flow through the hollow conductor of the bus- ¦
bar section, then heat can be conveyed by evaporative re-frigerant to the condensor 35 positioned above ground with-'.',~ I
~: Y~ ~
~ , I
" , .. , , : ,.
out the need for a secondary cooling system and withoutthe need for circulating pumps. Moreover, by appropriate choice of evaporative refrigerant, the need for high static pressures is avoided. Thus, if the section 32 of tubular conductor shown in Figure 4 operates at about 80C, carbon tetrachloride, which at atmospheric pressure boils at 76C, is a suitable refrigerant and the maximum pressure in the system is 63 p.s.i.g.
In the isolated phase busbar installation shown in Figure 5 each busbar (of which one only is shown) is housed underground in a substantially vertical shaft and its tubular conductor is divided along its length into a plurality of substantially fluid-tight sections 42 ~ 421 ~
4211 ... which are cooled by a common closed circulatory 15 system 41 for evaporable refrigerant. The upper end of each section 42 ~ 4213 4211 . . . iS connected via an electric-ally insulating coupling 43 ~ 431 ~ 4311 ~ ~ ~ to a common vapour return pipe 44 connected to a condensor 45 located above the ground.
The lower end of each section 42 ~ 421 ~ 4211 ~ ~ ~ is connected via an electrically insulating coupling 49 ~ 491 4911 `~o~ to an associated refrigerant reservoir 47 ~ 471 47~ Each reservoir 47~ 471~ 4711 ~ except the reservoir remote from the condensor 45 ~ is connected to the r 25 reservoir immediately below it by an overflow pipe 461, - 46~ ; the uppermost reservoir is connected to the con--~ densor by a pipe 50.
As the temperature of each section 42 ~ 421 ~ 42ll ,.. rises, the evaporable refrigerant caused by gravity to flow through each section evaporates and flows through the pipe 44 to the condensor 45 where it is liqùefied and flows , `'., ~
via the pipe 50 to the uppermost reservoir. As the amount of liquid refrigerant in each reservoir 471, 4711 ,., rises above the opening of the overflow pipe 461~ 4611 ,,, liquid refrigerant flows via the overflow pipe to the reservoir immediately below.
The isolated phase busbar installation shown in Figure 6 is similar to that shown in Figure 5 and, where appropriate 3 corresponding parts have been given numerical references greater by ten than the references to correspond-ing pàrts of the installation shown in Figure 5. Theinstallation differs from thatr.shown in Figure 5 in that all the reservoirs, except the lowermost reservoir 57, are omi,ttedg the pipes 561, 5611 ,., constituting effective reservoirs for each section 521, 5211 ... except the lower-most section.
~'~ ' ...
~:`
., .
.
~,~
~' `'~"
This invention relates to-electric busbar installations and is particularly concerned ~ith artificial cooling of electric busbar install-ations of the kind in which each busbar is arranged with its axis substan-tially vertical and ~hich, for example, may be employed in electric power statians, mines and multi-storey buildings.
According to the present invention an improved electric busbar installation comprises a substantially-rigid tube arranged with its axis substantially vertical, at least one busbar comprising a substantially rigid bare elongate conductor housed within and insulated from said rigid tube of fluid-impermeable material, at least one duct which is in thermal association with the elongate conductor throughout the length of the busbar and which forms part of a closed circulatory system ~or evaporable refrigerant, and interconnected in the clrculatory system, condensing means for receiving evaporated refrigerant from, and for delivering liquid refrigerant to, the duct, the arrangement being such that when the closed circulatory system is sealed and before the busbar installation is put on load, the refrigerant is stationary and the duct thermally associated with the or each elongate conductor is substantially filled with liquid refrigerant and that, when the busbar instal:Lation is on load, artificial cooling of the busbar is effected by extraction from the elongate conductor of the heat generated by the busbar, which heat raises the temperature of the elongate conductor to such an extent as to evaporate liquid refrigerant being caused to flow along the duct to the condensing means where it is cooled and condensed to liquid form for re-circulation along the duct.
Preferably the or each substantially rigid bare elongate conductor is in the -form of a tube and the bore of the tube constitutes the duct in thermal association with the elongate conductor but, in some circumstances, ~. ~ :,, - . ~ ,.. .
-:: ~
the duct in thermal association ~ith the or each elongate concluctor may be the bore o the substantially -2a-.` ~
:., . ..... ' . . ; ., .; ; ~ .: ~
.: , . ~. , ~ , :
rigid tube in which the or each elongate conductor is housed. In this latter case, the evaporable refrigerant will have electrically insulating properties and the substanti-ally rigid tube will be of fluid-impermeable material.
Preferably refrigerant flows to the condensing means thermosyphonically and liquid refrigerant flows from the condensing means under the action of gravity.
Artificial cooling of the elongate conductor of - the or each busbar of an electric busbar installation by evaporation of a liquid refrigerant in thermal association with the conductor has the important advantage that the evaporative cooling is self-regulating and will come into operation automatically when the temperature of the con-ductor exceeds the temperature of the condensing means.
Where a busbar installation is of great length, the length of the or each busbar may be sub-divided into ; sections and each of these sections may have its own separate closed circulatory system for evaporable refri-gerant. In this case, the closed circulatory system of each section of the busbar will have its own condensing means and refrigerant reservoir.
In some circumstances, each of two or more busbars, or a section of each of two or more busbars, may be cooled by a common closed circulatory system for evaporative refrigerant.
In an alternative arrangement sections of the bus-bar or of each of two or more busbars, may be cooled by a ~ -:
common closed circulatory system for evaporable refrigerant having a single condensing means, The duct of each of these sections of the busbar or of each busbar is fed with evaporable refrigerant from an associated refrigerant ... .
~,~
z~
_ Ll _ , reservoir, each reservoir except that reservoir remote from the condensing means being connected to a succeeding reser-voir in the closed circulatory system by an overflow pipe.
The refrigerant reservoir of each section of the or a bus-bar, except the section remote from the condensing means,may be constituted by the part of the circulatory system extending between the section and the overflow pipe.
It is preferred to employ as tha condensing means air-cooled or water-cooled heat exchangers and, where the busbar installation is housed in an underground shaft, the ~, . . .
condensing means can be conveniently located above ground.
Suitable evaporable refrigerants that may be employed include carbon tetrachloride, methyl chloride, ; ammonia, methanol, a hydrocarbon, e.g. C3H8, C4Hlo~ C5Hl2, and a fluorocarbon, e.g. CHClF2.
The invention is further illustrated by a descrip-tion, by way of example, of three forms of electric busbar installation with reference to the accompanying drawings, in which~
Figures 1, 2 and 3 are transverse cross-sectional views illustrating three alternative arrangements of rigid conductors in a busbar installation;
Figure 4 shows, diagrammatically, the arrangement ;~ for artificially cooling one section of one busbar of an isolated phase busbar installation housed underground in a substantially vertical shaft; and Figures 5 and 6, respectively, show diagramatically - two alternative arrangements for artificially cooling one busbar of an isolated busbar installation housed under-ground in a substantially vertical shaft.
Figure 1 shows an isolated phase busbar installa-,, '' ~- ~' ~' .
tion comprising three rigid metal tubes 1 in each of which is housed a substantially rigid bare elongate tubular con-ductor 2, each tubular conductor being secured to and insulated from the tube in which it is housed at spaced positions along the tube by rigid insulators 3. The bore 4 of the tubular conductor 2 constitutes the duct through which the evaporable refrigerant is caused to flow for artificially cooling the busbar.
In an alternative form of isolated phase busbar installation shown in Figure 2~ each of three rigid metal tubes 11 houses a substantial].y rigid elongate condu-ctor 12, each conductor being secured to and insulated ~rom the tube in which it is housed at spaced positions along the tube by rigid insulators.
The space 14 between each conduct3r 12 and its surrounding tube 11 constitutes the duct through which flows evaporable refrigerant with electrical insulating properties.
In the busbar installation shown in Figure 3,three rigid conductors 22 are housed in a common metal tube 21, ; the conductors being secured to and insulated from the tube by rigid insulators 23. Evaporable electrical insulating ~` refrigerant flows in the space 24 between the conductors 22 and the tube 21 Referring to Figure 4, each busbar of the isolated phase busbar installation is housed underground in a sub-stantially vertical shaft, 200 m in length, and dissipates ` 300 W/m when on full load. Each busbar is divided along its length into substantially fluid-tlght sections, of which one section 32 only is diagramatically illustrated, and each section has its own separate closed circulatory -- 6 ~
system 31 for evaporable refrigerant, the closed circulatory system of each section having its own condensor 35 and refrigerant reservoir 37. Thus, in Figure 4, the upper end of the section 32, of length 30 m, of the hollow conductor of one busbar is connected via an electrically insulating coupling 33 to a pipe 34 connected to the condensor 35 located above the ground. Exbending downwardly from the condensor 35 is a pipe 36 which is connected to the re-frigerant reservoir 37 located 170 m below ground level.
~10 The reservoir 37 is connected by a pipe 38 via an electric-- ally insulating coupling 39 to the lower end of the section 32. The section 32~ condensor 35, reservoir 37 and inter-connecting pipes 34, 36 and 38 constitute the closed cir-culatory system 31 for evaporable refrigerant.
If this busbar installation were to be cooled by forced water circulation, a static pressure of 2B4 p.s.i.g.
would be required, which is excessive. Each vertically-extending busbar could be divided into sections, e.g. of 30 m length, and each section cooled separately by forced water circulation, but heat dissipated at each of the ; ~ sections would have to be removed to ground level and this , . . .
~ would necessitate the provision of a secondary cooling , oircuit, e.g. using forced air circulation, with the result that artificial cooling of the busbar installation by this "
means is complicated and expensive.
In contradistinction, if, as diagrammatically , illustrated in Figure 4, each section 32 of each isolated phase busbar is cooled by arranging for evaporable re-frigerant to flow through the hollow conductor of the bus- ¦
bar section, then heat can be conveyed by evaporative re-frigerant to the condensor 35 positioned above ground with-'.',~ I
~: Y~ ~
~ , I
" , .. , , : ,.
out the need for a secondary cooling system and withoutthe need for circulating pumps. Moreover, by appropriate choice of evaporative refrigerant, the need for high static pressures is avoided. Thus, if the section 32 of tubular conductor shown in Figure 4 operates at about 80C, carbon tetrachloride, which at atmospheric pressure boils at 76C, is a suitable refrigerant and the maximum pressure in the system is 63 p.s.i.g.
In the isolated phase busbar installation shown in Figure 5 each busbar (of which one only is shown) is housed underground in a substantially vertical shaft and its tubular conductor is divided along its length into a plurality of substantially fluid-tight sections 42 ~ 421 ~
4211 ... which are cooled by a common closed circulatory 15 system 41 for evaporable refrigerant. The upper end of each section 42 ~ 4213 4211 . . . iS connected via an electric-ally insulating coupling 43 ~ 431 ~ 4311 ~ ~ ~ to a common vapour return pipe 44 connected to a condensor 45 located above the ground.
The lower end of each section 42 ~ 421 ~ 4211 ~ ~ ~ is connected via an electrically insulating coupling 49 ~ 491 4911 `~o~ to an associated refrigerant reservoir 47 ~ 471 47~ Each reservoir 47~ 471~ 4711 ~ except the reservoir remote from the condensor 45 ~ is connected to the r 25 reservoir immediately below it by an overflow pipe 461, - 46~ ; the uppermost reservoir is connected to the con--~ densor by a pipe 50.
As the temperature of each section 42 ~ 421 ~ 42ll ,.. rises, the evaporable refrigerant caused by gravity to flow through each section evaporates and flows through the pipe 44 to the condensor 45 where it is liqùefied and flows , `'., ~
via the pipe 50 to the uppermost reservoir. As the amount of liquid refrigerant in each reservoir 471, 4711 ,., rises above the opening of the overflow pipe 461~ 4611 ,,, liquid refrigerant flows via the overflow pipe to the reservoir immediately below.
The isolated phase busbar installation shown in Figure 6 is similar to that shown in Figure 5 and, where appropriate 3 corresponding parts have been given numerical references greater by ten than the references to correspond-ing pàrts of the installation shown in Figure 5. Theinstallation differs from thatr.shown in Figure 5 in that all the reservoirs, except the lowermost reservoir 57, are omi,ttedg the pipes 561, 5611 ,., constituting effective reservoirs for each section 521, 5211 ... except the lower-most section.
~'~ ' ...
~:`
., .
.
~,~
~' `'~"
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electric busbar installation comprising a substantially rigid tube arranged with its axis substantially vertical, at least one busbar comprising a substantially rigid bare elongate conductor housed within and insulated from said rigid tube, at least one duct which is in thermal association with the elongate conductor throughout the length of the busbar and which forms part of a closed circulatory system for evaporable refrigerant, and interconnected in the circula-tory system, condensing means for receiving evaporated refrigerant from, and for delivering liquid refrigerant to, the duct, the arrangement being such that when the closed circulatory system is sealed and before the busbar installation is put on load, the refrigerant is stationary and the duct thermally associated with the or each elongate conductor is substantially filled with liquid refrigerant and that, when the busbar installation is on load, artificial cooling of the bus-bar is effected by extraction from the elongate conductor of the heat generated by the busbar, which heat raises the temperature of the elongate conductor to such an extent as to evaporate liquid refrigerant being caused to flow along the duct to the condensing means where it is cooled and condensed to liquid form for recirculation along the duct.
2. An electric busbar installation comprising a substantially rigid tube arranged with its axis substantially vertical, at least one busbar comprising a substantially rigid bare elongate tubular conductor housed within and insulated from said rigid tube, the bore of the tubular conductor constituting a duct which is thermally associated with the elongate conductor and which forms part of a closed circulatory system for evaporable refrigerant, and interconnected in the circulatory system, condensing means for receiving evaporated refrigerant from, and for delivering liquid refrigerant to, the bore of the tubular conductor, the arrangement being such that when the closed circulatory system is sealed and before the busbar installation is put on load, the refrigerant is stationary and the duct thermally associated with the or each elongate conductor is substantially filled with liquid refrigerant and that, when the busbar installation is on load, artificial cooling of the busbar is effected by extraction from the elongate con-ductor of the heat generated by the busbar, which heat raises the temperature of the elongate conductor to such an extent as to evaporate liquid refrigerant being caused to flow along the bore of the tubular conductor to the condensing means where it is cooled and condensed to liquid form for re-circulation along the bore of the tubular conductor.
3. An electric busbar installation comprising a substantially rigid tube of fluid-impermeable material arranged with its axis substantially vertical, at least one busbar comprising a substantially rigid bare elongate conductor housed within and insulated from said rigid tube, which tube constitutes a duct which is thermally associated with the elongate conductor and which forms part of a closed circulatory system for evaporable electrically insulating refrigerant, and inter-connected in the circulatory system, condensing means for receiving evaporated refrigerant from, and for delivering liquid refrigerant to, the tube, the arrange-ment being such that when the closed circulatory system is sealed and before the busbar installation is put on load, the refrigerant is stationary and the duct thermally associated with the or each elongate conductor is substantially filled with liquid refrigerant and that, when the busbar installation is on load, artificial cooling of the busbar is effected by extraction from the elongate con-ductor of the heat generated by the busbar, which heat raises the temperature of the elongate conductor to such an extent as to evaporate liquid refrigerant being caused to flow along the tube to the condensing means where it is cooled and condensed to liquid form for re-circulation along the tube.
4. An electric busbar installation as claimed in Claim 1, 2 or 3, wherein refrigerant flows to the condensing means thermosyphonically and liquid refrigerant flows from the condensing means under the action of gravity.
5. An electric busbar installation is claimed in Claim 1, 2 or 3, wherein the length of the or each busbar is divided into substantially fluid-tight sections and each of these sections has its own separate closed circulatory system for evaporable refrigerant, the closed circulatory system of each section having its own condensing means and refrigerant reservoir. ..
6. An electric busbar installation as claimed in Claim 1, 2 or 3, wherein each of at least two busbars, or a section of each of at least two busbars, are cooled by a common closed circulatory system for evaporable refrigerant.
7. An electric busbar installation as claimed in Claim 1, wherein the length of the busbar or of each of at least two busbars is divided into sections and sections of the busbar or of said busbars are cooled by a common closed circulatory system for evaporable refrigerant having a single condensing means, the duct of each of these sections of the busbar or of each busbar being fed with evaporable refrigerant from an associated refrigerant reservoir, each reservoir, except that reservoir remote from the condensing means, being connected to a succeeding reservoir in the closed circulatory system by an overflow pipe.
8. An electric busbar installation claimed in Claim 7, wherein the reservoir of each section of the or a busbar, except the section remote from the condensing means, is constituted by the park or the circulatory system extending between the section and the overflow pipe.
9. An electric busbar installation as claimed in Claim 1, 2 or 3,wherein the condensing means is a fluid-cooled heat exchanger.
10. An electric busbar installation as claimed in Claim 1, 2 or 3, wherein the duct of the or each busbar, or of the or each section of busbar, is electrically insulated from the closed circulatory system of which it forms a park;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA293,913A CA1108254A (en) | 1977-12-23 | 1977-12-23 | Vertical electric busbar with circulatory cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA293,913A CA1108254A (en) | 1977-12-23 | 1977-12-23 | Vertical electric busbar with circulatory cooling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1108254A true CA1108254A (en) | 1981-09-01 |
Family
ID=4110388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA293,913A Expired CA1108254A (en) | 1977-12-23 | 1977-12-23 | Vertical electric busbar with circulatory cooling system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1108254A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9255741B2 (en) | 2012-01-26 | 2016-02-09 | Lear Corporation | Cooled electric assembly |
-
1977
- 1977-12-23 CA CA293,913A patent/CA1108254A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9255741B2 (en) | 2012-01-26 | 2016-02-09 | Lear Corporation | Cooled electric assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |