US3515939A - Dust precipitator - Google Patents

Dust precipitator Download PDF

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Publication number
US3515939A
US3515939A US653152A US3515939DA US3515939A US 3515939 A US3515939 A US 3515939A US 653152 A US653152 A US 653152A US 3515939D A US3515939D A US 3515939DA US 3515939 A US3515939 A US 3515939A
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Prior art keywords
conductor
region
electric field
particles
transmission line
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Expired - Lifetime
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US653152A
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English (en)
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John G Trump
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High Voltage Engineering Corp
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High Voltage Engineering Corp
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    • 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

Definitions

  • This invention relates to compressed-gas-insulated systems, such as belt-type electrostatic generators, and in particular to increasing the insulating capability and reliability of such systems.
  • My invention comprehends a belt-type electrostatic generator or other high-voltage compressedgas-insulated system wherein a region of reduced electric field is provided along the surface of at least one of the pair of electrodes between which the high voltage is applied for the entrapment of solid particulates.
  • My invention is not limited to electrostatic generators, but includes any two or multi-electrode system insulated in compressed gases, such as compressed-gas-insulated transmission lines.
  • one such embodiment of my invention comprehends a high voltage transmission line for the transport of electric power whether A-C or D-C, of the type in which a gas or a mixture of gases (such as N CO or SP at several to many times atmospheric pressure is used as the principal voltage-insulating medium, in which the central conductor is at high potential and supported at spaced intervals along its length by a solid insulator or by several such solid insulators, in which the outer cylindrical container is of aluminum or other metal to withstand internal gas pressure and is grounded and may serve as the grounded return line, and in which an electric field exists between the central conductor or conductors and the grounded shell; and, in accordance with the invention, means are provided for systematically reducing the electric field at regions near the surface of said shell or said conductor.
  • a gas or a mixture of gases such as N CO or SP at several to many times atmospheric pressure
  • means may be provided for producing at frequent intervals along the bottom envelope of said shell regions a substantially lower electric field for the collection of particles of matter.
  • a perforated metallic plate may be mounted in the lower portion of the shell to produce regions of low electric field between plate and shell into which solid particulates may become lodged and inactivated. In this way the electric field of the energized transmission line is employed to accelerate loose fragments of matter into regions of such low electric field intensity that they are permanently trapped (inactivated).
  • One method that would greatly improve this situation lies in providing continuously along the length of a compressed gas transmission line a region of low electric field which can serve as a sink or permanent repository for the unwanted particulates.
  • a particular method of accomplishing this which is suitable for a practical transmission line would be to provide along the lower region of the transmission line cross-section a low-field region by modifying the geometry of the outer shell in this region. This could be done, for example, by interposing a perforated metal shield as a kind of chord across the bottom portion of the interior cylindrical surface. Particulates which are traveling back and forth in the manner indicated above, due to electrical induction and electrostatic force, would find their way before long into one of the openings in this grounded shield.
  • the electric field intensity will be much reduced Even beneath the center of each opening in the shield, the electric field intensity will be reduced by a factor which can be made several orders of magnitude. For example, if the spacing of the shield above the inner surface of the cylinder is equal to the diameter of the shield opening, then the electric field intensity on the pipe surface under the opening will be about 5 percent. If this spacing is equal to three diameters the field reduction factor increases from about 20 to more than 500. Since the force acting on a particle is equal to the product of its induced charge and the electric field intensity, the force acting on a particle, even under the center of an opening, would be reduced by a factor equal to the square of the reduction in the electrical field intensity.
  • FIG. 1 is a diagrammatic view of an electrostatic belttype generator embodying the present invention
  • FIG. 2 is a transverse sectional view along the line 22 of FIG. 1;
  • FIG. 3 is a transverse section of a transmission line having a perforated chord-like shield for entrapping foreign particles
  • FIG. 4 is a detail of FIG. 3;
  • FIGS. -8 are views similar to that of FIG. 3, each showing a different modification of the shield;
  • FIG. 9 is a longitudinal central section of a coupling for transmission line adapted to entrap foreign particles
  • FIG. is a longitudinal central section of a transmission line of which the central conductor is adapted to entrap foreign particles
  • FIG. 11 is a transverse section of a modified form of the transmission line shown in FIG. 10;
  • FIG. 12 is a view similar to that of FIG. 11, showing a modification thereof.
  • FIG. 13 is a view similar to that of FIG. 10, showing a modification of the embodiment shown in FIG. 11.
  • FIG. 1 the operation of the electrostatic belt type generator therein shown is in general well known and need not be de scribed herein in any detail. Suffice it to say that electric charge is carried by an insulating belt 1 supported be tween two pulleys 2, 3 from the grounded end of the apparatus to a hollow electrode 4 which constitutes a high voltage terminal.
  • the voltage-generating apparatus is enclosed within a tank 5 containing insulating gas under pressure. Details of operation of electrostatic belt type generators may be found, for example, in US. Pat. No. 1,991,236 to Van de Graalf and No. 2,252,668 to Trump and at Volume XI, page 1 of Reports on Progress in Physics (1948).
  • a sheet of metal 6 having apertures is placed over the surface of the tank 5 opposite the high voltage. terminal 4 and at the portion of the tank wall having the lowest gravitational potential i.e. at the side nearest ground in a gravitational as distinct from electrical sense.
  • This sheet 6 may be for example No. gauge 304 stainless steel mesh having %-inch diameter holes on %-inch centers. Along the axis of this sheet is supported a stainless steel bar (304) inch thick, 1 /2 -inch wide, and protruding 3-inches beyond the ends of the sheet, which might be five feet long and five feet wide for a five-foot-diameter tank. The sheet is screwed or bolted to the surface of the.
  • the bar serving to increase the depth of the fieldfree region between the sheet and the tank.
  • the ratio between the diameter of the holes in the sheet and the distance from the inner surface of the perforated sheet to the inner surface of the tank is an important one and should preferably be as 1 to 3 or 4.
  • a central conductor 8 is supported along the axis of a pressure pipe 9, in any of the manners described in my copending patent application Ser. No. 749,135, filed July 31, 1968.
  • a perforated metal shield or plate 10 is interposed across the bottom portion of the interior cylindrical surface of the pressure pipe 9, so as to form a kind of chord.
  • the shield 10 is electrically connected to the grounded shell 9, so that radial field lines originating at the central conductor 8 at high potential terminate on the shield 10, and the region between the shield 10 and the shell 9 is one of low electric field from which particulates cannot readily escape.
  • the shield 11 is curved to approach the contour of the shell 9 so as to increase spacing between central conductor -8 and shield 1'1.
  • the low field region is produced by extending a small portion 12 of the circumference of the shell 13 toward and preferably downward to form a channel.
  • the center conductor 14 is off-centered upward so as to (1) reduce the radial electric field in the lower portion of the line and (2) diminish the effective weight of the central conductor 14 by the differentially greater upward electrostatic force.
  • the low field region is provided by metal pipe or ducts 1 5 which serve not only to carry control and information cables (or even liquids) but also by their arrangement to produce low gradient regions along the bottom of the main pipe 9 in which particles of matter can become permanently entrapped.
  • the pipes 15 should be slightly separated,as shown, to allow the particulates to get in between.
  • the narrowest portion of the gap between adjacent pipes 15 may be about one-third the radius of the pipe 15.
  • the joint or coupling of the outer shell or pipe of a compressed gas transmission electric power line may itself provide an electrostatic particle catcher, as shown in FIG. 9.
  • one end 16 of a pipe 17 may be welded to one end 18 of an adjacent pipe 19.
  • the welded joint 16, 18 forms a channel 20* of depth h and width w.
  • the gap w should be less than the depth h by a factor of at least 3, and preferably about 4 for good trapping of particles, particularly conducting particles.
  • the center conductor is shown at 21.
  • the low-field particle-trapping region be associated with the outer shell.
  • the gradient at the outer surface of the inner conductor is substantially higher than the gradient at the inner surface of the outer conductor, so that the provision of a low gradient region is inherently more difiicult at the central conductor, nevertheless in cases where the central conductor is hollow the region within it will be a naturally field-free region and may be used to trap particles.
  • FIG. 10 One such arrangement is shown in FIG. 10. Referring thereto, the central conductor 22 has perforations 23 into which particles will fly. Inside the central conductor 22 the electric field is nearly zero and therefore particles which reach the interior of the central conductor 22 are trapped.
  • the perforations or apertures 23* are preferably rimmed as shown at 24 to prevent particles from dropping out again.
  • the metal in making the perforations the metal may be pressed from the outside inward so as to form an inwardly projecting rim 24.
  • the system of periodic holes 23' in the central conductor 22 shown in FIG. 10- will also help cool it by causing convection currents in the insulating gas.
  • FIG. 11 A modification of the embodiment shown in FIG. 10 is shown in FIG. 11.
  • particle-collecting apertures 24 are provided only along the top of the central conductor 26.
  • the central conductor 26 is supported not at the center of the outer shell 27 but off center in a downward direction by about 10%. This lowers the gradient in the region of the apertures 25 with respect to the gradient at other portions of the circumference of the central conductor 26 so that particles rotate gradually towards the region of lowest electric field, which region exists above the central conductor 26, from which, they will gradually be collected by the periodic holes or slots 25.
  • the added radial length may then be used to advantage by locating a post type suspension insulator in this region of added radial length, as shown at 28 in FIG. 12.
  • a high voltage gas-insulated transmission line for the transport of electric power comprising an outer conductor of low potential enclosing insulating gas, an inner conductor at high potential, means for insulatably sup porting said inner conductor at spaced intervals along its length and means for systematically reducing the electric field at regions near the surface of at least one of said conductors.
  • said field reducing means comprises an extension of said outer conductor forming a longitudinal channel along the interior of said outer conductor thereby defining a low field region within said channel for entrapping moving particles.
  • said field reducing means comprises an apertured electrode physically near and electrically connected to the interior surface of said outer conductor, said electrode and said outer conductor defining a region of low electric field for entrapping particles moving in said insulating gas.
  • a high voltage gas-insulated transmission line for the transport of electric power comprising an outer conductor at low potential enclosing insulating gas, a hollow apertured inner conductor at high potential, means for insulably supporting said inner conductor within said outer conductor, and wherein said hollow apertured conductor encloses a region of low electric field for entrapping particles moving in said insulating gas.
  • an electrostatic generator apparatus for the removal of conducting and semiconducting particles, the combination of: a sealed tank enclosing insulating gas connected to ground potential, a high voltage electrode designed to be corona-free and mounted within said tank, an apertured electrode electrically connected to and supported by the interior surface of said tank for defining a region of low electric field to entrap said particles moving in said insulating gas.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Electrostatic Separation (AREA)
  • Installation Of Bus-Bars (AREA)
US653152A 1967-07-13 1967-07-13 Dust precipitator Expired - Lifetime US3515939A (en)

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US65315267A 1967-07-13 1967-07-13

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US (1) US3515939A (cg-RX-API-DMAC7.html)
JP (1) JPS4839110B1 (cg-RX-API-DMAC7.html)
BE (1) BE717844A (cg-RX-API-DMAC7.html)
CH (1) CH493274A (cg-RX-API-DMAC7.html)
DE (1) DE1782048B2 (cg-RX-API-DMAC7.html)
FR (1) FR1574328A (cg-RX-API-DMAC7.html)
GB (1) GB1236472A (cg-RX-API-DMAC7.html)
NL (1) NL157136B (cg-RX-API-DMAC7.html)
SE (1) SE367725B (cg-RX-API-DMAC7.html)

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792188A (en) * 1972-08-21 1974-02-12 Ite Imperial Corp Conductive particle trap for high-power, gas-insulated transmission system
US3814879A (en) * 1971-03-09 1974-06-04 Westinghouse Electric Corp Circuit interrupter with improved trap for removing particles from fluid insulating material
US3856978A (en) * 1974-02-21 1974-12-24 Westinghouse Electric Corp Adherent coating for captivating small particles in gas-insulated electrical equipment
US3864507A (en) * 1974-02-25 1975-02-04 Aluminum Co Of America Electrical conductor
US3898367A (en) * 1974-11-26 1975-08-05 Gen Electric Particle trap for compressed-gas insulated high voltage bus
US3911937A (en) * 1974-02-21 1975-10-14 Westinghouse Electric Corp Adherent coating for captivating small particles in gas-insulated electrical equipment
US4029891A (en) * 1976-01-22 1977-06-14 General Electric Company Particle trapping sheath coupling for enclosed electric bus apparatus
US4029890A (en) * 1976-04-19 1977-06-14 General Electric Company Particle trapping elbow joint for enclosed high voltage electric bus apparatus
US4029892A (en) * 1975-11-28 1977-06-14 General Electric Company Method and means for trapping particles in enclosed high voltage electric bus apparatus
US4034147A (en) * 1976-02-25 1977-07-05 Gould Inc. Contamination control device
US4084064A (en) * 1977-09-02 1978-04-11 Westinghouse Electric Corporation Particle trap contact for gas insulated transmission lines
US4085807A (en) * 1977-05-16 1978-04-25 Westinghouse Electric Corporation Gas-insulated transmission line with closed particle trap
US4088826A (en) * 1977-05-13 1978-05-09 Westinghouse Electric Corp. Gas-insulated electrical apparatus with field-installable particle traps
US4110551A (en) * 1976-10-14 1978-08-29 Electric Power Research Institute, Inc. Extruded sheath section for compressed gas insulated transmission lines
US4117528A (en) * 1977-02-28 1978-09-26 Westinghouse Electric Corp. Gas-insulated transmission lines with dc voltage limiting means
US4135130A (en) * 1977-06-29 1979-01-16 The United States Of America As Represented By The United States Department Of Energy Method of testing gas insulated systems for the presence of conducting particles utilizing a gas mixture of nitrogen and sulfur hexafluoride
WO1979000607A1 (en) * 1978-02-09 1979-08-23 Ssab Svenskt Stal Ab Gas-filled cable
US4277258A (en) * 1977-12-09 1981-07-07 F. L. Smidth & Co. Electrostatic precipitator and discharge electrode therefor
US4330682A (en) * 1980-11-14 1982-05-18 The United States Of America As Represented By The Department Of Energy Hybrid particle traps and conditioning procedure for gas insulated transmission lines
US4335268A (en) * 1980-11-14 1982-06-15 Westinghouse Electric Corp. Particle trap with dielectric barrier for use in gas insulated transmission lines
US4335267A (en) * 1979-10-26 1982-06-15 Westinghouse Electric Corp. Gas insulated transmission line including provisions for minimizing particle generation
US4343964A (en) * 1981-01-19 1982-08-10 The United States Of America As Represented By The United States Department Of Energy Adhesive coated electrical apparatus having sublimable protective covering and an assembly method
US4400578A (en) * 1981-03-12 1983-08-23 Cookson Alan H High voltage gas insulated transmission line with continuous particle trapping
USRE31949E (en) * 1979-10-26 1985-07-16 Westinghouse Electric Corp. Gas insulated transmission line including provisions for minimizing particle generation
US4554399A (en) * 1984-04-26 1985-11-19 The United States Of America As Represented By The United States Department Of Energy Particle trap for compressed gas insulated transmission systems
DE4100721A1 (de) * 1991-01-10 1992-07-23 Transformatoren Und Schaltgera Druckgasisolierung fuer metallgekapselte senkrecht stehende hochspannungsanordnungen
DE4100720A1 (de) * 1991-01-10 1992-07-23 Transformatoren Und Schaltgera Druckgasisolierung fuer metallgekapselte waagerecht angeordnete hochspannungsschaltgeraete
WO1996008859A1 (de) * 1994-09-16 1996-03-21 Siemens Aktiengesellschaft Rohrförmige metallkapselung
WO2001022565A1 (en) * 1999-09-17 2001-03-29 Katsuo Sakai Electrostatic generating method
US20090147435A1 (en) * 2007-12-07 2009-06-11 Krause Stephen E Particle trap
US20100265635A1 (en) * 2009-04-20 2010-10-21 Mitsubishi Electric Corporation Gas-insulated switchgear
US20110000697A1 (en) * 2006-10-31 2011-01-06 Mitsubishi Electric Corporation Gas insulated electric apparatus
RU2443031C2 (ru) * 2009-12-29 2012-02-20 Федеральное государственное унитарное предприятие "Государственный научный центр Российской Федерации - Физико-энергетический институт имени А.И. Лейпунского" Способ очистки изолированного газом высоковольтного устройства
DE102015214126A1 (de) * 2015-07-27 2017-02-02 Siemens Aktiengesellschaft Phasenleiteranordnung
DE102015218728A1 (de) 2015-09-29 2017-03-30 Siemens Aktiengesellschaft Partikelfalle für eine gasisolierte Anlage und gasisolierte Anlage mit Partikelfalle
WO2018069214A1 (de) 2016-10-14 2018-04-19 Siemens Aktiengesellschaft Gasisolierte elektrische übertragungsleitung und verfahren zu deren herstellung
US11120827B2 (en) 2014-07-28 2021-09-14 International Business Machines Corporation Conductive polymers for use in magnetic media

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5310714U (cg-RX-API-DMAC7.html) * 1976-07-09 1978-01-28
JPS5480816U (cg-RX-API-DMAC7.html) * 1977-11-19 1979-06-08
JPS5554067U (cg-RX-API-DMAC7.html) * 1978-10-09 1980-04-12
CH655609B (cg-RX-API-DMAC7.html) * 1979-09-21 1986-04-30
JPS59179685U (ja) * 1983-05-19 1984-11-30 株式会社　大阪西川 ふとんカバ−
US6307172B1 (en) 2000-01-13 2001-10-23 Mitsubishi Electric Power Products, Inc. Circuit breaker with particle trap
RU2204193C1 (ru) * 2002-05-27 2003-05-10 Общество с ограниченной ответственностью Межрегионснаб НК Способ получения статического электричества
SE0302852D0 (sv) * 2003-10-26 2003-10-26 Christer Skogsberg Elektromagnetiskt attraherande luftoxidator - Absolutfilter

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US3157479A (en) * 1962-03-26 1964-11-17 Arthur F Boles Electrostatic precipitating device
US3431411A (en) * 1964-05-28 1969-03-04 Philips Corp Infrared spectra of powders by means of internal reflection spectroscopy

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3157479A (en) * 1962-03-26 1964-11-17 Arthur F Boles Electrostatic precipitating device
US3431411A (en) * 1964-05-28 1969-03-04 Philips Corp Infrared spectra of powders by means of internal reflection spectroscopy

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814879A (en) * 1971-03-09 1974-06-04 Westinghouse Electric Corp Circuit interrupter with improved trap for removing particles from fluid insulating material
US3898408A (en) * 1971-03-09 1975-08-05 Westinghouse Electric Corp Circuit interrupter with improved trap for removing particles from fluid insulating material
US3792188A (en) * 1972-08-21 1974-02-12 Ite Imperial Corp Conductive particle trap for high-power, gas-insulated transmission system
US3856978A (en) * 1974-02-21 1974-12-24 Westinghouse Electric Corp Adherent coating for captivating small particles in gas-insulated electrical equipment
US3911937A (en) * 1974-02-21 1975-10-14 Westinghouse Electric Corp Adherent coating for captivating small particles in gas-insulated electrical equipment
US3864507A (en) * 1974-02-25 1975-02-04 Aluminum Co Of America Electrical conductor
US3898367A (en) * 1974-11-26 1975-08-05 Gen Electric Particle trap for compressed-gas insulated high voltage bus
US4029892A (en) * 1975-11-28 1977-06-14 General Electric Company Method and means for trapping particles in enclosed high voltage electric bus apparatus
US4029891A (en) * 1976-01-22 1977-06-14 General Electric Company Particle trapping sheath coupling for enclosed electric bus apparatus
US4034147A (en) * 1976-02-25 1977-07-05 Gould Inc. Contamination control device
US4029890A (en) * 1976-04-19 1977-06-14 General Electric Company Particle trapping elbow joint for enclosed high voltage electric bus apparatus
US4110551A (en) * 1976-10-14 1978-08-29 Electric Power Research Institute, Inc. Extruded sheath section for compressed gas insulated transmission lines
US4117528A (en) * 1977-02-28 1978-09-26 Westinghouse Electric Corp. Gas-insulated transmission lines with dc voltage limiting means
US4088826A (en) * 1977-05-13 1978-05-09 Westinghouse Electric Corp. Gas-insulated electrical apparatus with field-installable particle traps
US4085807A (en) * 1977-05-16 1978-04-25 Westinghouse Electric Corporation Gas-insulated transmission line with closed particle trap
FR2391537A1 (fr) * 1977-05-16 1978-12-15 Westinghouse Electric Corp Ligne de transmission isolee par un gaz comportant un piege a particules ferme
US4135130A (en) * 1977-06-29 1979-01-16 The United States Of America As Represented By The United States Department Of Energy Method of testing gas insulated systems for the presence of conducting particles utilizing a gas mixture of nitrogen and sulfur hexafluoride
US4084064A (en) * 1977-09-02 1978-04-11 Westinghouse Electric Corporation Particle trap contact for gas insulated transmission lines
US4277258A (en) * 1977-12-09 1981-07-07 F. L. Smidth & Co. Electrostatic precipitator and discharge electrode therefor
WO1979000607A1 (en) * 1978-02-09 1979-08-23 Ssab Svenskt Stal Ab Gas-filled cable
US4347401A (en) * 1978-02-09 1982-08-31 Spacab Ab Gas-filled cable with composite conduit of low carbon steel and aluminum and having particle traps
US4335267A (en) * 1979-10-26 1982-06-15 Westinghouse Electric Corp. Gas insulated transmission line including provisions for minimizing particle generation
USRE31949E (en) * 1979-10-26 1985-07-16 Westinghouse Electric Corp. Gas insulated transmission line including provisions for minimizing particle generation
US4335268A (en) * 1980-11-14 1982-06-15 Westinghouse Electric Corp. Particle trap with dielectric barrier for use in gas insulated transmission lines
US4330682A (en) * 1980-11-14 1982-05-18 The United States Of America As Represented By The Department Of Energy Hybrid particle traps and conditioning procedure for gas insulated transmission lines
US4343964A (en) * 1981-01-19 1982-08-10 The United States Of America As Represented By The United States Department Of Energy Adhesive coated electrical apparatus having sublimable protective covering and an assembly method
US4400578A (en) * 1981-03-12 1983-08-23 Cookson Alan H High voltage gas insulated transmission line with continuous particle trapping
US4554399A (en) * 1984-04-26 1985-11-19 The United States Of America As Represented By The United States Department Of Energy Particle trap for compressed gas insulated transmission systems
DE4100721A1 (de) * 1991-01-10 1992-07-23 Transformatoren Und Schaltgera Druckgasisolierung fuer metallgekapselte senkrecht stehende hochspannungsanordnungen
DE4100720A1 (de) * 1991-01-10 1992-07-23 Transformatoren Und Schaltgera Druckgasisolierung fuer metallgekapselte waagerecht angeordnete hochspannungsschaltgeraete
WO1996008859A1 (de) * 1994-09-16 1996-03-21 Siemens Aktiengesellschaft Rohrförmige metallkapselung
WO2001022565A1 (en) * 1999-09-17 2001-03-29 Katsuo Sakai Electrostatic generating method
US20110000697A1 (en) * 2006-10-31 2011-01-06 Mitsubishi Electric Corporation Gas insulated electric apparatus
US8546687B2 (en) * 2006-10-31 2013-10-01 Mitsubishi Electric Corporation Gas insulated electric apparatus
US20090147435A1 (en) * 2007-12-07 2009-06-11 Krause Stephen E Particle trap
US8000080B2 (en) 2007-12-07 2011-08-16 Varian Semiconductor Equipment Associates, Inc. Particle trap
US7990687B2 (en) 2009-04-20 2011-08-02 Mitsubishi Electric Corporation Gas-insulated switchgear
US20100265635A1 (en) * 2009-04-20 2010-10-21 Mitsubishi Electric Corporation Gas-insulated switchgear
RU2443031C2 (ru) * 2009-12-29 2012-02-20 Федеральное государственное унитарное предприятие "Государственный научный центр Российской Федерации - Физико-энергетический институт имени А.И. Лейпунского" Способ очистки изолированного газом высоковольтного устройства
US11120827B2 (en) 2014-07-28 2021-09-14 International Business Machines Corporation Conductive polymers for use in magnetic media
DE102015214126A1 (de) * 2015-07-27 2017-02-02 Siemens Aktiengesellschaft Phasenleiteranordnung
US10211617B2 (en) 2015-07-27 2019-02-19 Siemens Aktiengesellschaft Phase conductor arrangement
WO2017055020A1 (de) 2015-09-29 2017-04-06 Siemens Aktiengesellschaft Partikelfalle für eine gasisolierte anlage und gasisolierte anlage mit partikelfalle
DE102015218728A1 (de) 2015-09-29 2017-03-30 Siemens Aktiengesellschaft Partikelfalle für eine gasisolierte Anlage und gasisolierte Anlage mit Partikelfalle
WO2018069214A1 (de) 2016-10-14 2018-04-19 Siemens Aktiengesellschaft Gasisolierte elektrische übertragungsleitung und verfahren zu deren herstellung
DE102016220083A1 (de) 2016-10-14 2018-04-19 Siemens Aktiengesellschaft Gasisolierte elektrische Übertragungsleitung und Verfahren zu deren Herstellung

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BE717844A (cg-RX-API-DMAC7.html) 1969-01-10
SE367725B (cg-RX-API-DMAC7.html) 1974-06-04
NL6809714A (cg-RX-API-DMAC7.html) 1969-01-15
CH493274A (fr) 1970-07-15
DE1782048B2 (de) 1975-05-22
DE1782048A1 (de) 1972-01-20
GB1236472A (en) 1971-06-23
JPS4839110B1 (cg-RX-API-DMAC7.html) 1973-11-21
FR1574328A (cg-RX-API-DMAC7.html) 1969-07-11
NL157136B (nl) 1978-06-15

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