CA1117209A - Electrical apparatus utilizing polypropylene felt filter - Google Patents
Electrical apparatus utilizing polypropylene felt filterInfo
- Publication number
- CA1117209A CA1117209A CA000315338A CA315338A CA1117209A CA 1117209 A CA1117209 A CA 1117209A CA 000315338 A CA000315338 A CA 000315338A CA 315338 A CA315338 A CA 315338A CA 1117209 A CA1117209 A CA 1117209A
- Authority
- CA
- Canada
- Prior art keywords
- disposed
- filter
- gas
- enclosure
- outer sheath
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G5/00—Installations of bus-bars
- H02G5/06—Totally-enclosed installations, e.g. in metal casings
- H02G5/063—Totally-enclosed installations, e.g. in metal casings filled with oil or gas
- H02G5/065—Particle traps
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Installation Of Bus-Bars (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Filtering Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Gas insulated electrical apparatus utilizes a polypropylene felt at selected locations within the apparatus enclosure. The flexible polypropylene felt filter prevents the passage of particulate matter, but allows the passage of the insulating gas, typically sulfur hexafluoride.
The polypropylene felt filter will not disintegrate in the presence of arc products generated in the unlikely event of an arc in the sulfur hexafluoride.
Gas insulated electrical apparatus utilizes a polypropylene felt at selected locations within the apparatus enclosure. The flexible polypropylene felt filter prevents the passage of particulate matter, but allows the passage of the insulating gas, typically sulfur hexafluoride.
The polypropylene felt filter will not disintegrate in the presence of arc products generated in the unlikely event of an arc in the sulfur hexafluoride.
Description
; ~
~
Reference ls made to th~ below-listed U.S. Patents which are assigned to the ~ame assi8nee a~ the present invention.
1. U.S~ Patent No. 4~161,621 is~usd July 17~ 1979 ; to P, C~ Bolin et al, entitled "Spacer Mount For A Gas In~ulated Transmission Line".
~
Reference ls made to th~ below-listed U.S. Patents which are assigned to the ~ame assi8nee a~ the present invention.
1. U.S~ Patent No. 4~161,621 is~usd July 17~ 1979 ; to P, C~ Bolin et al, entitled "Spacer Mount For A Gas In~ulated Transmission Line".
2. UOS. Patent No. 4,085,807 i~l~ued April 25, lg78 to P0 C. Bolin~ entitled "Gas In~ulated Transmi~ion Line With Closed Particle Trap".
. 3. UOS. Patent NoO 4,105,859 i~sued Augu~t 8, 1978 ; 20 to Ao H. Cook~on et al~ entitled "Compartmentalized Ga~ Insulat~d Tran~mission Line".
.~ ~
~ his invention relates generally ~o high ~oltage electrlcal apparatu~, and more particularly ~o the use o~ a polypropylelle felt ~ilt~r in ga~-in~ulated electrical app~ratus.
; . Ga~-insulated ele~trical equipment i~ being u~sd 47g935 On an ever-increasing scale for the transmlssion and distri-bution of electrical energy, particularly at higher volt-ages. This equipment offers advantages in the reduced land area required, the increased safety because of the typically grounded outer enclosure of the equipment, the non-toxicity of the insulating gas even in the presence of decomposition products, and the quieter operation of the equipment. Also, for gas-insulated transmission lines, there is no disturb-ance of the surrounding environment by the intrusion of electromagnetic fields from the high current-carrying con-ductor, because of the grounded outer sheath.
In this gas-insulated equipment, there are numer- ;~
ous locations where it is desirable to provide a flexible filter material within the outer enclosure of the equipment.
The purpose of this flexible filter is to prevent the pass-age of particulate matter, which can cause deleterious effects and a lessening of the dielectric strength of the insulating gas, but which filter should allow the passage of the insulating gas, which typically is sulfur hexafluoride.
For all of these apparatus~ it is required that the filter material be compatible with the dielectric-type materials present within the apparatus, and with the insulating gas.
` A critical requirement is that in the unlikely event of an ` arc in sulfur hexafluoride, for example due to a failure, - the filter material should not be attacked by the arc pro-ducts in the sulfur hexafluoride. This latter requirement eliminates virtually all of the open cell foam materials such as polyurethane and polystyrene,` which are attacked by sulfur hexafluoride products and can disintegrate. Mater ials that are not attacked by sulfur hexafluoride products~
7 2~ ~
47~935 such as polypropylene and te:trafluoroethylene ~
cannot be made in an open cell foam structure to allow the : passage of sulfur hexafluoride gas. Thus, what is needed is . : a filter material for use in gas-insulated electrical appa--.............. ratus which will prevent the passage of particulate matter but which will allow the passage of the insulating gas.
. SUMMARY OF THE INVENTION
In accordance with this invention, electrical apparatus includes an enclosure which contains an insulating gas, typical of which is sulfur hexafluoride, and a filter is disposed at selected locations within the enclosure. The filter is made Or polypropylene felt, which~ will allow the passage of the insulating gas therethrough but prevent the passage of particulate matter.
. BRIEF DESCRIPTION OF TH~ DRAWINGS
: .
. Reference is now made to the descriptlon o~ the . preferred embodiments, illustrated in the accompanying drawing, in which:
Figure 1 is a sectional view of a gas~insulated ~ 20 transmission line, typical of the electrical apparatus which :: may utilize the invention;
Figure 2 is a cross-sectional view of the trans- ~
mission line taken along line II-II of Figure l; : ~-Figure 3 is a detailed view of the filter utilized ~ in conjunction with a spacer ring in a transmission line; :.
:~ Figure 4 is a detailed view of the filter utilized in conjunction with an insulating support;
Figure ~ is a view of the filter utilized with a plug-in conductor Joint; and Figure 6 is a view illustrating the filter used in
. 3. UOS. Patent NoO 4,105,859 i~sued Augu~t 8, 1978 ; 20 to Ao H. Cook~on et al~ entitled "Compartmentalized Ga~ Insulat~d Tran~mission Line".
.~ ~
~ his invention relates generally ~o high ~oltage electrlcal apparatu~, and more particularly ~o the use o~ a polypropylelle felt ~ilt~r in ga~-in~ulated electrical app~ratus.
; . Ga~-insulated ele~trical equipment i~ being u~sd 47g935 On an ever-increasing scale for the transmlssion and distri-bution of electrical energy, particularly at higher volt-ages. This equipment offers advantages in the reduced land area required, the increased safety because of the typically grounded outer enclosure of the equipment, the non-toxicity of the insulating gas even in the presence of decomposition products, and the quieter operation of the equipment. Also, for gas-insulated transmission lines, there is no disturb-ance of the surrounding environment by the intrusion of electromagnetic fields from the high current-carrying con-ductor, because of the grounded outer sheath.
In this gas-insulated equipment, there are numer- ;~
ous locations where it is desirable to provide a flexible filter material within the outer enclosure of the equipment.
The purpose of this flexible filter is to prevent the pass-age of particulate matter, which can cause deleterious effects and a lessening of the dielectric strength of the insulating gas, but which filter should allow the passage of the insulating gas, which typically is sulfur hexafluoride.
For all of these apparatus~ it is required that the filter material be compatible with the dielectric-type materials present within the apparatus, and with the insulating gas.
` A critical requirement is that in the unlikely event of an ` arc in sulfur hexafluoride, for example due to a failure, - the filter material should not be attacked by the arc pro-ducts in the sulfur hexafluoride. This latter requirement eliminates virtually all of the open cell foam materials such as polyurethane and polystyrene,` which are attacked by sulfur hexafluoride products and can disintegrate. Mater ials that are not attacked by sulfur hexafluoride products~
7 2~ ~
47~935 such as polypropylene and te:trafluoroethylene ~
cannot be made in an open cell foam structure to allow the : passage of sulfur hexafluoride gas. Thus, what is needed is . : a filter material for use in gas-insulated electrical appa--.............. ratus which will prevent the passage of particulate matter but which will allow the passage of the insulating gas.
. SUMMARY OF THE INVENTION
In accordance with this invention, electrical apparatus includes an enclosure which contains an insulating gas, typical of which is sulfur hexafluoride, and a filter is disposed at selected locations within the enclosure. The filter is made Or polypropylene felt, which~ will allow the passage of the insulating gas therethrough but prevent the passage of particulate matter.
. BRIEF DESCRIPTION OF TH~ DRAWINGS
: .
. Reference is now made to the descriptlon o~ the . preferred embodiments, illustrated in the accompanying drawing, in which:
Figure 1 is a sectional view of a gas~insulated ~ 20 transmission line, typical of the electrical apparatus which :: may utilize the invention;
Figure 2 is a cross-sectional view of the trans- ~
mission line taken along line II-II of Figure l; : ~-Figure 3 is a detailed view of the filter utilized ~ in conjunction with a spacer ring in a transmission line; :.
:~ Figure 4 is a detailed view of the filter utilized in conjunction with an insulating support;
Figure ~ is a view of the filter utilized with a plug-in conductor Joint; and Figure 6 is a view illustrating the filter used in
-3-: , ,,~; .;
, 7 ~ ~
47,93S an insulating support spacerO
DESCRIPTION OF THE PR~F~RP~D EMBODIMENT
Figure 1 illustrates a gas~insulated kransmission line, ~hich is ~ypical of the types of elec~rical apparatus which may utilize the teachings of this inYention~ U7 So Patent No~ 39~56,97~ issued December 24, 1974 to Sletten et al illustrates numerous other examples of gas-insulated electrical apparatus i~ which the invention of the present application may be utilized. The transmission line 10 of Figure 1 is comprised of an elongated, cylindrical outer sheath 12 which is typically at low or ground potential7 an inner conductor 14 disposed within the outer sheath 12? and an insulating gas 16 which is generally sulfur hexafluorlde disposed within the outer sheath 12 and which gas 16 electrically insulates the inner conductor 14 from the grounded outer sheath 12. The inner conductor 14 is typically at a high electrical potential, for example 145-1200 kV, and both the ou~er sheath 12 and the inner conducting member 14 l~ill be oP a good electrically ; conducting material such as aluminum~ Means 1~ are uti.lized for insulatably supporking the inner conductor 1l~ wi~hin ~he outer sheath 12. The support means 1~ illustrated in ~igures : 1 and 2 are insulating supports 20 which compri~e a cen~ral portion 22 and a plurality of legs 24 which extend from the ;: sentral portion 22 outwardly to the outer sheath 12 .. The support 20 is typically comprised of an epoxy resin material. Secured to the insulating support 20 is a particle trapping ring 26 which has a plurality of openings 2~ thereinO The ring 26 is electrically connected to the .~ outer sheath 12, as by the contact 30, so as to form a low field region 32 between the rlng 26 and the ou~er
, 7 ~ ~
47,93S an insulating support spacerO
DESCRIPTION OF THE PR~F~RP~D EMBODIMENT
Figure 1 illustrates a gas~insulated kransmission line, ~hich is ~ypical of the types of elec~rical apparatus which may utilize the teachings of this inYention~ U7 So Patent No~ 39~56,97~ issued December 24, 1974 to Sletten et al illustrates numerous other examples of gas-insulated electrical apparatus i~ which the invention of the present application may be utilized. The transmission line 10 of Figure 1 is comprised of an elongated, cylindrical outer sheath 12 which is typically at low or ground potential7 an inner conductor 14 disposed within the outer sheath 12? and an insulating gas 16 which is generally sulfur hexafluorlde disposed within the outer sheath 12 and which gas 16 electrically insulates the inner conductor 14 from the grounded outer sheath 12. The inner conductor 14 is typically at a high electrical potential, for example 145-1200 kV, and both the ou~er sheath 12 and the inner conducting member 14 l~ill be oP a good electrically ; conducting material such as aluminum~ Means 1~ are uti.lized for insulatably supporking the inner conductor 1l~ wi~hin ~he outer sheath 12. The support means 1~ illustrated in ~igures : 1 and 2 are insulating supports 20 which compri~e a cen~ral portion 22 and a plurality of legs 24 which extend from the ;: sentral portion 22 outwardly to the outer sheath 12 .. The support 20 is typically comprised of an epoxy resin material. Secured to the insulating support 20 is a particle trapping ring 26 which has a plurality of openings 2~ thereinO The ring 26 is electrically connected to the .~ outer sheath 12, as by the contact 30, so as to form a low field region 32 between the rlng 26 and the ou~er
4-,.
. . ,,~, ;,.~
.", ; 1~7,935 sheath 12. Elec~rically conducting or semiconducting par-ticles which may be contaminaking the interior of the outer `. sheath 12 can then pass through the openings 2~ in the ring 26 and be entrapped wlthin the low field region 32 there-between so as not tQ cause electrical flashover or breakdo~
. within the transmission line 10~ One location where it may be desirable to provide a filter is in the low field region 32 between the particle trapping ring 26 and the outer sheath 12.
As shown in F~.gure 3, in some locations, the transmission line 10 of Figure 1 may be disposed at an angle to the horizontal, so that any particles which may have been trapped within the low field region 32 would have a tendency, due to gravity, to migrate out of the low field region 32~
: Because of this possible migration, it is desirable to in-clude a barrier 34 at ~he longitudinal end 36 of the par-ticle trapping ring 26 to prevent this migration of particles from within ~he low field region 32. As descr-i.bcd in the referenced U. S. Patent 4,0~5,~07, the barr~er 34 should ~.
be in contact with both the outer sheath 12 and the :~ trapping ring 26. Thus, in this loca~lon, it may be desir- `
able to provide a seal or filter which will prevent the passage oP particulate ma~ter~ and where it may be desirable to allow the passage of the insulating5 sulfur hexafluoride gas~ m e barrier 34t which would also be the filter9 is made of a polypropylene Pelt material~ This filter 34 would . not be attacked by sul~ur hexafluoride, and can operate .` satisfactorily e~en in the even~ of a sulfur hexafluoride arc. The Pilter~ of polypropylene felt, can be made ko khe . 30 required porosity and ~ilter size by weaving po~ypropylene .~ -5-.:.
... ~j~, 7~
1~7,93 5 , ~ fibers of suitable diameter and suitable mesh. If necessary or desirable, the filter ma~erial can be glazed and singed so as to bind the fibers into the pack~ or filter, and prevent the fibers from working loose.
Figure 4 illustrates another location where it is desirable to provide a filter which will prevent the passage of contaminating particles but will allow the passage of sulfur hexafluoride gas9 which filter must be impervious to the effects of sulfur hexafluoride or the arc products resulting therefrom. In this figure, ~he support means 1 comprises a barrier insulator 40, illustrated as being of conical cross section) which is secured to the inner con~
ductor 14 and extends to a support ring 42 which is disposed :
.~ adjacent to, and secured to, the outer sheath 12. A more detailed description of this type o~ barrier insulator 1~0 . and the support ring 42 may be found in the referenced :~ U. S. Patent 4~161,621. The purpose of this barrler insulator 40, is to substantially compar~mentalize ~he ;~ sections of the transmission line 10 on opposing long1tu-. 20 dinal sections 44, ~6 of the barrler ~nsulator 400 B~ such -. compartmentalizing, any fault which occurs in one section9 .~ for example 44, will not transmit its contamination par- -ticles across the support insula~or 40 into the other trans- :
missi.on line section 46~ However7 to facilitate the filling ~ of the transmission line 10 with sulfur hexafluoride gas9 it ~ is desirable to provide a means for allo~ng the passage of the gas past the barrier insulator 40. This can be provided by the filter ~. As with the preceding embodimentO this filter should allow the passage of the sulfur hexafluoride gas without permit~ing the passage of the contamination ,; ~
.. : ., ' :
.
~ 7~ ~
.; 1~7~935 `: particles. The filter 48 may be disposed wlthin an opening 50 within the support ring 42,. and the filter 48 should contact both the ring 42 and the outer sheath 12. The filter 48 is of the polypropylene felt material previously : described with respect to Figure 3.
Another location where it may be desired to util-.. ize the propylene felt filter of this invention is illus-.~. trated in Figure 5. This ~igure illustrates a plug-in joint connection between electrically conducting members 56, 58, . 10 which, for example, may be two sections of the inner con- ;
: ductor 14. The one electrically conducting member 56 would :
. have a plug member 60 at one end thereof, and the other .; electrically conducting member 58 would hav.e a socket 62 at . . ~ .
one end thereof. The plug member 60 would be disposed within the socket 62 to provide electrical connection be- :
tween the conducting members 56 and 58. A plurality of contacts 64 may be utilized to provide electrical contact : between the plug member 60 and the conducting member 58. To minimize corona and arcing at this connection, a shield 66 20 may be disposed about and encircle this ~oint connection. .:
The shield 66 would extend longitudinally outwardly to both ., . ;:
the conducting members 56 and 58. A mounting rod 68, or a ~.
plurality of similar rods, would be utilized for securing the shield 66 to the conducting member 58. A wiper 70 would .. be disposed between the shield 66 and the conducting member ;
56 to prevent the escape of any conducting particles from the area 72 between the shield 665 the conducting members 56 :~ and 58~ and the plug member 6~ to the insulating gas 16.
However9 it is desirable to.allow this insulating gas 16 to ~; 3o enter into this ~oint region 72. Thi.s can be accomplished, :.
, ~7 ~ g35 ' ' : without allowing the passage. of the contamination particles, . which may be generated by the sliding action of the plug member 60 in the socket 62, by utilizing a polypropylene felt filter 74. This filter 74, of the polypropylene felt : construction previously described, would be disposed wlthin an opening 76 in the shield 66, and would contact both the ; shield 66 and the conducting member: 58. By being so dis-; posed, the filter 74 would allow the passage of the insulat-ing gas 16 into the region 72 of the joint, but would pre-vent the passage of conducting particles from wlthin the !~ j oint area 72 outwardly into khe insulating g2s 16 where it may cause flashover and breakdown. Although described with respect to the transmission line 10 of Figure 1, the plug-in joint of Figure 5 ma~, for example, be within a disconnect switch, a gas-insulated substation, or any other gas-lnsul-ated electrical apparakus.
Another location wherein the polyethylene felt ~ilter may be utilized in i.llustrated in Figure 6~ In this Figure, the insulating spacer 80 completely ~ills in the cross-sectional area between the inner conductor 14 and khe outer sheath 12. The spacer 80 has a central opening 82 therein through which khe inner conductor 14 extends, and one or more openings 84 which extend longitudinally khrough the spacer 80. In this opening 84 is disposed the poly-propylene felt filter 86, which can be utilizeq tc stop the migration o~ decomposition particles, dust, or dirt past the insulaking spacer 80, but which permits the flow of the insulating gas therethrough throughout the len~th of the transmission line 10. A more detailed descripti:on of thi.s type of insulaking spacer 80~ with.`its openings 84 therein, . -^`~ 9 1~7, 93 5 , , may be found ln the United States patent to Artbauer et al~U~ S. Patent No. 37996f~14 issued December 7, 1976. As before~ the polypropylene felt fil~er ~6 can be made to the desired velocity and filter size by weaving polypropylene fibers o~ suitable diameter and suitable mesh, and may be glazed and singed so as to bind the fibers in~o the filter and prevent the fibers from working loose.
Thus, it can be seen that this invention provides a filter which prevents the passa~e of contamination dust .
but which allows the passage of the insulating gas in gas :~
insulated electrical apparatusO The polypropylene felt filter can be utilized in ~hose numerous loca~ions in gas-insulated electrical appara~us whère it is desired to pro-vide such filteringg and provides such filtering without being attacked by a sulfur hexaM uoride arc or the decompo-sition products resulting from such arc, ~9--;'' ,. ~;
: ~,
. . ,,~, ;,.~
.", ; 1~7,935 sheath 12. Elec~rically conducting or semiconducting par-ticles which may be contaminaking the interior of the outer `. sheath 12 can then pass through the openings 2~ in the ring 26 and be entrapped wlthin the low field region 32 there-between so as not tQ cause electrical flashover or breakdo~
. within the transmission line 10~ One location where it may be desirable to provide a filter is in the low field region 32 between the particle trapping ring 26 and the outer sheath 12.
As shown in F~.gure 3, in some locations, the transmission line 10 of Figure 1 may be disposed at an angle to the horizontal, so that any particles which may have been trapped within the low field region 32 would have a tendency, due to gravity, to migrate out of the low field region 32~
: Because of this possible migration, it is desirable to in-clude a barrier 34 at ~he longitudinal end 36 of the par-ticle trapping ring 26 to prevent this migration of particles from within ~he low field region 32. As descr-i.bcd in the referenced U. S. Patent 4,0~5,~07, the barr~er 34 should ~.
be in contact with both the outer sheath 12 and the :~ trapping ring 26. Thus, in this loca~lon, it may be desir- `
able to provide a seal or filter which will prevent the passage oP particulate ma~ter~ and where it may be desirable to allow the passage of the insulating5 sulfur hexafluoride gas~ m e barrier 34t which would also be the filter9 is made of a polypropylene Pelt material~ This filter 34 would . not be attacked by sul~ur hexafluoride, and can operate .` satisfactorily e~en in the even~ of a sulfur hexafluoride arc. The Pilter~ of polypropylene felt, can be made ko khe . 30 required porosity and ~ilter size by weaving po~ypropylene .~ -5-.:.
... ~j~, 7~
1~7,93 5 , ~ fibers of suitable diameter and suitable mesh. If necessary or desirable, the filter ma~erial can be glazed and singed so as to bind the fibers into the pack~ or filter, and prevent the fibers from working loose.
Figure 4 illustrates another location where it is desirable to provide a filter which will prevent the passage of contaminating particles but will allow the passage of sulfur hexafluoride gas9 which filter must be impervious to the effects of sulfur hexafluoride or the arc products resulting therefrom. In this figure, ~he support means 1 comprises a barrier insulator 40, illustrated as being of conical cross section) which is secured to the inner con~
ductor 14 and extends to a support ring 42 which is disposed :
.~ adjacent to, and secured to, the outer sheath 12. A more detailed description of this type o~ barrier insulator 1~0 . and the support ring 42 may be found in the referenced :~ U. S. Patent 4~161,621. The purpose of this barrler insulator 40, is to substantially compar~mentalize ~he ;~ sections of the transmission line 10 on opposing long1tu-. 20 dinal sections 44, ~6 of the barrler ~nsulator 400 B~ such -. compartmentalizing, any fault which occurs in one section9 .~ for example 44, will not transmit its contamination par- -ticles across the support insula~or 40 into the other trans- :
missi.on line section 46~ However7 to facilitate the filling ~ of the transmission line 10 with sulfur hexafluoride gas9 it ~ is desirable to provide a means for allo~ng the passage of the gas past the barrier insulator 40. This can be provided by the filter ~. As with the preceding embodimentO this filter should allow the passage of the sulfur hexafluoride gas without permit~ing the passage of the contamination ,; ~
.. : ., ' :
.
~ 7~ ~
.; 1~7~935 `: particles. The filter 48 may be disposed wlthin an opening 50 within the support ring 42,. and the filter 48 should contact both the ring 42 and the outer sheath 12. The filter 48 is of the polypropylene felt material previously : described with respect to Figure 3.
Another location where it may be desired to util-.. ize the propylene felt filter of this invention is illus-.~. trated in Figure 5. This ~igure illustrates a plug-in joint connection between electrically conducting members 56, 58, . 10 which, for example, may be two sections of the inner con- ;
: ductor 14. The one electrically conducting member 56 would :
. have a plug member 60 at one end thereof, and the other .; electrically conducting member 58 would hav.e a socket 62 at . . ~ .
one end thereof. The plug member 60 would be disposed within the socket 62 to provide electrical connection be- :
tween the conducting members 56 and 58. A plurality of contacts 64 may be utilized to provide electrical contact : between the plug member 60 and the conducting member 58. To minimize corona and arcing at this connection, a shield 66 20 may be disposed about and encircle this ~oint connection. .:
The shield 66 would extend longitudinally outwardly to both ., . ;:
the conducting members 56 and 58. A mounting rod 68, or a ~.
plurality of similar rods, would be utilized for securing the shield 66 to the conducting member 58. A wiper 70 would .. be disposed between the shield 66 and the conducting member ;
56 to prevent the escape of any conducting particles from the area 72 between the shield 665 the conducting members 56 :~ and 58~ and the plug member 6~ to the insulating gas 16.
However9 it is desirable to.allow this insulating gas 16 to ~; 3o enter into this ~oint region 72. Thi.s can be accomplished, :.
, ~7 ~ g35 ' ' : without allowing the passage. of the contamination particles, . which may be generated by the sliding action of the plug member 60 in the socket 62, by utilizing a polypropylene felt filter 74. This filter 74, of the polypropylene felt : construction previously described, would be disposed wlthin an opening 76 in the shield 66, and would contact both the ; shield 66 and the conducting member: 58. By being so dis-; posed, the filter 74 would allow the passage of the insulat-ing gas 16 into the region 72 of the joint, but would pre-vent the passage of conducting particles from wlthin the !~ j oint area 72 outwardly into khe insulating g2s 16 where it may cause flashover and breakdown. Although described with respect to the transmission line 10 of Figure 1, the plug-in joint of Figure 5 ma~, for example, be within a disconnect switch, a gas-insulated substation, or any other gas-lnsul-ated electrical apparakus.
Another location wherein the polyethylene felt ~ilter may be utilized in i.llustrated in Figure 6~ In this Figure, the insulating spacer 80 completely ~ills in the cross-sectional area between the inner conductor 14 and khe outer sheath 12. The spacer 80 has a central opening 82 therein through which khe inner conductor 14 extends, and one or more openings 84 which extend longitudinally khrough the spacer 80. In this opening 84 is disposed the poly-propylene felt filter 86, which can be utilizeq tc stop the migration o~ decomposition particles, dust, or dirt past the insulaking spacer 80, but which permits the flow of the insulating gas therethrough throughout the len~th of the transmission line 10. A more detailed descripti:on of thi.s type of insulaking spacer 80~ with.`its openings 84 therein, . -^`~ 9 1~7, 93 5 , , may be found ln the United States patent to Artbauer et al~U~ S. Patent No. 37996f~14 issued December 7, 1976. As before~ the polypropylene felt fil~er ~6 can be made to the desired velocity and filter size by weaving polypropylene fibers o~ suitable diameter and suitable mesh, and may be glazed and singed so as to bind the fibers in~o the filter and prevent the fibers from working loose.
Thus, it can be seen that this invention provides a filter which prevents the passa~e of contamination dust .
but which allows the passage of the insulating gas in gas :~
insulated electrical apparatusO The polypropylene felt filter can be utilized in ~hose numerous loca~ions in gas-insulated electrical appara~us whère it is desired to pro-vide such filteringg and provides such filtering without being attacked by a sulfur hexaM uoride arc or the decompo-sition products resulting from such arc, ~9--;'' ,. ~;
: ~,
Claims (14)
1. Electrical apparatus of the type including an enclosure containing sulfur hexafluoride gas, a plurality of members disposed within said enclosure, certain of said members being disposed proximate other of said members, and a filter being made of polypropylene felt.
2. The apparatus according to claim 1 wherein a conducting member is disposed within said enclosure, a barrier insulator insulatably supports said conducting member within said enclosure, and said filter is disposed adjacent said barrier insulator.
3. The apparatus according to claim 1 wherein a conducting member is disposed within said enclosure, an insulating spacer insulatably supports said conducting member within said enclosure, said spacer having an opening therethrough, and said filter is disposed within said spacer opening.
4. The apparatus according to claim 1 wherein a conducting member is disposed within said enclosure, an insulating spacer insulatably supports said conducting member within said enclosure, a spacer ring is secured to said spacer spaced-apart from said enclosure, and said filter is disposed between, and in physical contact with, said spacer ring and said enclosure.
5. The apparatus according to claim 1 wherein a pair of cylindrical conducting members are insulatably sup-ported within said enclosure, one of said conducting members having a plug member secured at one end thereof and the other of said conducting members having a socket at one end thereof, said plug member being disposed within said socket;
a shield disposed within said enclosure encircling said conducting members adjacent said plug member and said socket, and said filter is disposed intermediate, and in contact with, one of said conducting members and said shield.
a shield disposed within said enclosure encircling said conducting members adjacent said plug member and said socket, and said filter is disposed intermediate, and in contact with, one of said conducting members and said shield.
6. A gas-insulated transmission line of the type including:
a cylindrical outer sheath;
an inner conductor disposed within said outer sheath an insulating gas disposed within said outer sheath and electrically insulating said inner conductor within said outer sheath; and means for insulatably supporting said inner conductor within said outer sheath wherein the improvement comprises a polypropylene felt filter disposed at selected locations within said outer sheath.
a cylindrical outer sheath;
an inner conductor disposed within said outer sheath an insulating gas disposed within said outer sheath and electrically insulating said inner conductor within said outer sheath; and means for insulatably supporting said inner conductor within said outer sheath wherein the improvement comprises a polypropylene felt filter disposed at selected locations within said outer sheath.
7. The gas-insulated transmission line according to claim 6 wherein a ring is disposed within, and spaced-apart from, said outer sheath; and said filter is disposed between, and in physical contact with, said ring and said outer sheath.
8. The gas-insulated transmission line according to claim 7 wherein said support means comprises a support insulator, said support insulator being secured to said ring.
9. The gas-insulated transmission line according to claim 8 wherein said support insulator substantially fills in the cross-sectional area between said inner conductor and said ring.
10. The gas-insulated transmission line according to claim 7 wherein said ring has a plurality of apertures therein, and said ring is electrically connected to said outer sheath.
11. The gas-insulated transmission line according to claim 6 wherein said support means comprises a support insulator having an opening therethrough, and said filter is disposed within said support insulator opening.
12. The gas-insulated transmission line according to claim 6 wherein said inner conductor comprises two cylindrical conductor sections, one of said conductor sections having a plug member at one end thereof and the other of said conductor sections having a socket at one end thereof, said plug member being disposed in said socket;
a shield encircles said conductor sections adjacent said plug member and said socket; and said filter is disposed intermediate, and in contact with, said shield and one of said conductor sections.
a shield encircles said conductor sections adjacent said plug member and said socket; and said filter is disposed intermediate, and in contact with, said shield and one of said conductor sections.
13. The gas-insulated transmission line according to claim 6 wherein said polypropylene felt filter is comprised of a plurality of polypropylene fibers weaved into a mesh structure.
14. The gas-insulated transmission line according to claim 13 wherein said polypropylene fibers are glazed and singed so as to bind said fibers into said filter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90842078A | 1978-05-22 | 1978-05-22 | |
| US908,420 | 1978-05-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1117209A true CA1117209A (en) | 1982-01-26 |
Family
ID=25425780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000315338A Expired CA1117209A (en) | 1978-05-22 | 1978-10-31 | Electrical apparatus utilizing polypropylene felt filter |
Country Status (4)
| Country | Link |
|---|---|
| JP (2) | JPS54153294A (en) |
| AU (1) | AU4635979A (en) |
| CA (1) | CA1117209A (en) |
| GB (1) | GB1603960A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4711973A (en) * | 1987-02-27 | 1987-12-08 | Westinghouse Electric Corp. | Gas insulated transmission line with simplified insulator assembly and method of assembling same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4085807A (en) * | 1977-05-16 | 1978-04-25 | Westinghouse Electric Corporation | Gas-insulated transmission line with closed particle trap |
-
1978
- 1978-05-31 GB GB2584078A patent/GB1603960A/en not_active Expired
- 1978-10-31 CA CA000315338A patent/CA1117209A/en not_active Expired
-
1979
- 1979-04-23 AU AU46359/79A patent/AU4635979A/en not_active Abandoned
- 1979-05-22 JP JP6229579A patent/JPS54153294A/en active Pending
-
1982
- 1982-05-11 JP JP6755582U patent/JPS6013221Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54153294A (en) | 1979-12-03 |
| JPS6013221Y2 (en) | 1985-04-26 |
| JPS583726U (en) | 1983-01-11 |
| AU4635979A (en) | 1979-11-29 |
| GB1603960A (en) | 1981-12-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |