EP3811391B1 - Système de contact à fermeture - Google Patents

Système de contact à fermeture Download PDF

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Publication number
EP3811391B1
EP3811391B1 EP19752937.3A EP19752937A EP3811391B1 EP 3811391 B1 EP3811391 B1 EP 3811391B1 EP 19752937 A EP19752937 A EP 19752937A EP 3811391 B1 EP3811391 B1 EP 3811391B1
Authority
EP
European Patent Office
Prior art keywords
contact
contact system
make contact
contacts
shielding element
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.)
Active
Application number
EP19752937.3A
Other languages
German (de)
English (en)
Other versions
EP3811391C0 (fr
EP3811391A1 (fr
Inventor
Christian Schacherer
Martin Koletzko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Publication of EP3811391A1 publication Critical patent/EP3811391A1/fr
Application granted granted Critical
Publication of EP3811391C0 publication Critical patent/EP3811391C0/fr
Publication of EP3811391B1 publication Critical patent/EP3811391B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
    • H01H2033/66269—Details relating to the materials used for screens in vacuum switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
    • H01H2033/66276—Details relating to the mounting of screens in vacuum switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
    • H01H2033/66292—Details relating to the use of multiple screens in vacuum switches

Definitions

  • High-voltage applications require live parts to be earthed quickly, for example when a mains fault occurs.
  • An example application is the grounding of high-voltage cables in HVDC systems or the bridging of parts of the high-voltage arresters used there.
  • GIS gas-insulated switchgear
  • the pamphlet DE 28 15 059 A1 discloses a make contact system for high voltage applications corresponding to the preamble of claim 1.
  • the object of the invention is to significantly reduce the closing time of closing contact systems, in particular high-speed earth electrodes in the high-voltage range, compared to the prior art.
  • the make contact system according to the invention for high-voltage applications according to patent claim 1 is characterized in that a vacuum interrupter is provided with two switching contacts, which are designed in the form of plate contacts. At least one of the plate contacts is designed as a so-called moving contact, which is coupled to a drive is. Furthermore, the closing contact system is characterized in that at least one of the plate contacts is surrounded in a rotationally symmetrical manner by a shielding element, the shielding element having an electrical conductivity of less than 40 ⁇ 10 -6 S/m.
  • the first measure consists in the use of a vacuum interrupter in contrast to the gas-insulated circuit used in the prior art.
  • the vacuum interrupter includes plate contacts which can be of relatively simple design in terms of their geometry and which require a very small contact spacing due to the high electrical insulating properties which are provided by the vacuum prevailing in the vacuum interrupter. This in turn means that a smaller switching path has to be covered anyway, which already significantly shortens the closing time.
  • a further measure is that a shielding element is arranged around at least one of the plate contacts, this shielding element already preventing a flashover and thus enabling the plate contacts to come closer together in the operating state, with the shielding element having a relatively low electrical conductivity in a further step, which has been found to be useful according to the invention in order to further reduce the distance between the two plate contacts.
  • plate contacts is generally understood to mean plate-shaped contacts that are preferred do not have any geometries that control the magnetic field, but these are not harmful either. Plate contacts are preferably simple contact systems that could be used in the described make contact system, since these contacts only have to close and do not have to interrupt the flow of current.
  • a distance of 10 mm/100 kV rated voltage of the vacuum interrupter is a distance that is suitable for enabling very short closing times compared to the prior art. It is expedient here if an average closing speed of the contact or contacts that is moved during a closing process, ie the moving contact, is between 2 m/s and 8 m/s. Such closing speeds can be achieved by known drive systems.
  • the at least one shielding element surrounds the moving contact.
  • the shielding element can also be expedient here for the shielding element to move at least part of the movement of the moving contact along a switching axis, which leads to better shielding during the switching process.
  • the screen element preferably has an electrical conductivity of 40 ⁇ 10 -6 S/m. Particularly preferably, the screen element a lower conductivity of 20 ⁇ 10 -6 S / m, which is guaranteed in particular when using iron or an iron alloy, especially stainless steel.
  • the closing contact system is characterized in that the drive has a coupling element which is used to pretension a cable rotation pendulum kinematics, with this kinematics a rotary movement of a rotary body being converted into a translational movement of a winding body with the aid of winding cables.
  • the winding body is used to drive the moving contact, the cable rotation pendulum kinematics are suitable for providing very high switching speeds, with contact bouncing during the closing process also being prevented.
  • a make contact system 1 which includes a vacuum interrupter 28 and a drive 5 .
  • the vacuum interrupter 28 in turn comprises a housing 50 which, on the one hand, has a plurality of insulator elements 48 and a metal interrupter chamber 49 , a contact system 3 being arranged in the housing 50 of the vacuum interrupter 28 .
  • the contact system 3 includes two switching contacts that are designed in the form of plate contacts 4 and 6 .
  • the first plate contact 4 is designed in the form of a moving contact 30 .
  • the plate contacts 4, 6 are contacts that have essentially circular contact surfaces 34, which are characterized by a diameter 38.
  • the contact surfaces 34 in turn are at a distance 36 from one another in an open position.
  • the moving contact 30 is provided with a contact pin 44 which is led out of the housing 50 of the vacuum interrupter 28 in an insulated manner by means of a bellows 46 , the contact pin 44 being shown only schematically here being mechanically coupled to a drive 5 .
  • a possible embodiment of the drive 5 is detailed in the Figures 5 to 7 received.
  • an arc (not shown here) is ignited a few millimeters before the plate contacts 4, 6 are touched, and a high current flow occurs. Depending on the magnitude of the current flow and its duration until the final contact is made, the arc begins to melt or melt the contact surfaces 34 . The melted contact surfaces 34 then collide and possibly weld. Melting is enhanced when contacts bounce. This bouncing occurs in particular at high closing speeds with conventional spring drives.
  • a shielding element 32 which also acts as a potential ring, is used at least one, preferably both contacts 4, 6 attached.
  • the screen element 32 is installed around the moving contact 4, 30 in an end position in the open state. This is the representation according to figure 1 . On other possible arrangements of the screen element 32 is in the Figures 2 to 4 received.
  • the shielding element 32 thus at least essentially prevents the ignition of an arc in the open state, with the result that the plate contacts 4, 6 can be positioned at a smaller distance 36 than according to State of the art is the case.
  • the reduced distance 36 contributes to a shorter switching time.
  • the closing speed is preferably between 2 m/s and 8 m/s.
  • the plate contact 4, in particular the moving contact 30, can be further reduced in terms of its mass by various measures.
  • the contact pin 44 can be configured in a tubular manner, which leads to a reduced mass.
  • a tubular embodiment of the contact bolt instead of a solid contact bolt is possible in the present application as a closing contact system, in particular of a quick-acting earth electrode, since a current does not have to be conducted over a longer period of time.
  • This contact bolt 44 can also be made of a lighter material, for example graphite or a non-metal.
  • the application of graphite also as a coating of the contact pin 44 can contribute to improving the vacuum.
  • the features that lead to a reduction in the mass of the moving contact 30 or the contact pin 44 also cause the contacts to bounce less on one another during the closing process, which in turn results in less formation of welds or formation of tips and edges.
  • Another measure to avoid fusions is the use of a high-melting or high-temperature-resistant material, which is arranged at least in the area of the contact surfaces 34 of the contacts 4, 6.
  • a high-melting or high-temperature-resistant material which is arranged at least in the area of the contact surfaces 34 of the contacts 4, 6.
  • the addition of bismuth, tungsten, titanium and/or zirconium, for example, as an alloying element of the contact material is appropriate. This measure also reduces melting of the contact surface 34 when the contacts 4, 6 approach.
  • the distance between the plate contacts 4, 6 prefferably be no more than 10 mm/100 kV rated voltage of the vacuum interrupter 28 in an open state. With such a small distance 36, the described advantageous effects of the make contact system can be achieved. In particular, the distance 36 should not be less than 8 mm/100 kV nominal. It is useful to provide a drive speed that is between 2 m / s and 8 m / s, which by a drive 5 according to Figures 5 to 7 is enabled.
  • the ratio between the distance 36 of the contact surface 34 of the plate contacts 2, 4 to their diameter 38 is between X and Y, preferably between V and W.
  • This relationship between distance and diameter is also suitable for the formation of a To suppress arcing and thus also to prevent welding and the formation of peaks and edges.
  • the shielding element it has also been found to be expedient for the shielding element to have an electrical conductivity that is lower than that of copper.
  • an electrical conductivity of the material of the shielding element of less than 40 ⁇ 10 -6 S/m means that the shielding element 32 has sufficient conductivity and that the formation of an arc is permanently suppressed.
  • a conductivity of the material of the screen element 32, 33 that is less than 20 ⁇ 10 -6 S/m is particularly advantageous, with an iron-based alloy or stainless steel being expedient as the material of the screen element 32, 33 according to the invention.
  • an iron-based alloy or stainless steel being expedient as the material of the screen element 32, 33 according to the invention.
  • the moving contact 4, 30 In an open state of the contacts 4, 6, the moving contact 4, 30 is pulled back so far that it terminates with an outer edge of the shielding element 32 with respect to a perpendicular to a switching axis 40, whereby particularly good shielding is achieved.
  • the moving contact 4, 30 closes, the in figure 1 described screen element 32, as in figure 2 pictured, stand firm.
  • FIG. 3 shows a closed state of the contact pair 3, the shielding elements 32 and 33 having the contacts 4, 6 being moved towards one another and almost resting against one another.
  • the moving screen element 33 is only moved part way along the switching axis 40 during the closing process, so that the screen elements 32, 33 are present at a distance from one another in the closed state of the contact system 3.
  • the core of the drive is a coupling element 2, described in more detail below, for prestressing a rope rotation pendulum kinematics, in which a rotary movement of a rotating body (10) is converted into a translatory movement of a winding body 8 with the aid of winding ropes 16.
  • the Figures 1 to 3 show a schematic embodiment of a coupling element 2.
  • the contact system 3, consisting of the plate contacts in the form of plate contacts 4 and 6, is actuated with the coupling element 2, with the plate contact 4 being moved relative to the plate contact 6 for this purpose.
  • the pair of contacts 3, which includes the plate contacts 4, 6 are those that are already in the Figures 1 to 4 are explained schematically.
  • This current flow can be interrupted again by opening the contact system by moving the two plate contacts 4 and 6 apart.
  • the plate contact 4, which is designed in the form of the moving contact 30, is mechanically coupled to a lower end of the winding body 8, which is also referred to below as the winding rod.
  • the plate contact 4 is shown directly at the lower end of the bobbin 8, which is a simplified representation intended to illustrate the direct effect of the kinematics on the movement of the contact 4, 30.
  • further components such as the contact pin 44, can be interposed between the winding body 8 and the plate contact 4, 30 in the coupling mentioned.
  • sections of the winding body 8 can serve as contact pins 44 .
  • the winding body 3 can be displaced linearly, that is to say in a translatory manner, being guided along its longitudinal axis 14, but it cannot be twisted in the process.
  • the longitudinal axis 14 preferably, but not necessarily, coincides with the shifting axis 40 .
  • a rotating body 10 is rotatably mounted on the winding body 8, i.e. the rotating body can rotate on the winding body.
  • the rotary body 8 has a bore through which the rod-shaped winding body 8 protrudes.
  • a bearing 13 is provided between the winding body 8 and the rotating body 10, so that the rotation of the rotating body 10 is as friction-free and low-loss as possible.
  • the rotating body 8 comprises two discs or sides 11 and 12 spaced apart from one another. Between these two sides 11 and 12 of the rotating body is In this embodiment, the bearing 13 is shown schematically, which is intended to illustrate that the rotating body 10 is rotatably mounted on the winding body 8 .
  • Figure 1 shows a position of the coupling member 2 with the contacts 4 and 6 open at their furthest possible distance from each other. This distance is referred to as the end position E with respect to the position of the contact 4, 30.
  • the figure 2 shows a middle position between the end position E and the in figure 3 illustrated end position E', in which the contacts 4, 30 and 6 are closed and current can flow via the contacts.
  • the rotary body 10 is coupled with two springs 18--in this example.
  • the springs 18 are designed for tensile loading and are attached to the rotating body 10 at one end and fixed to a fixed point 24 outside of the coupling member 2 at the other end.
  • a detent 20 is provided, which in turn is connected to an actuator 22.
  • the locking device 20 is shown very schematically by a rod; the locking device 20 can be designed, for example, in the form of two toothed rims that engage in one another, which is not shown explicitly here for the sake of better clarity.
  • the coupling element comprises winding ropes 16 or 16', which are fastened between the rotating body 10 and the winding body 8, preferably provided with a certain pretension.
  • the ropes 16 are each attached to the winding body 8 and as far as possible with a second attachment point attached to the outside of the discs 11 and 12 and to the upper and lower sides 11 and 12 of the rotary body 10, respectively.
  • Ropes are understood here to mean flexible structures such as tendons, wire ropes or aramid fibers that have a high modulus of elasticity on one side in order to achieve the strongest possible prestressing between the winding body 8 and the rotating body 10 .
  • the ropes 16' are wound around the winding body by several revolutions in the lower area between the side 12 of the rotary body 10 and the plate contact 4.
  • the cables 16 are in the position of the end position E according to figure 1 not twisted. If the lock 20 is opened, for example caused by a signal that is forwarded to the actuator 22, then the prestressing of the springs 18 and 18', which are designed overall in such a way that a resonator results, generates a rotational movement of the rotating body.
  • the system is designed with regard to the prestressing of the individual springs 18 and 18 'that not only a contact between the contacts 4 and 6 is made, but an offset force, that is to say an additional contact pressure force, also acts on the plate contact 6 through the winding body 8 and the plate contact 4, 30.
  • an offset force that is to say an additional contact pressure force, also acts on the plate contact 6 through the winding body 8 and the plate contact 4, 30.
  • the rotational movement of the rotating body 10 is designed in such a way that the rotating body 10 at an opening and completes a rotation of about 90° in each direction during a closing process.
  • the switching time i.e. the time that the coupling element needs to get from the end position E' to the end position E and vice versa, is determined by the rigidity of the springs 18 used and by the inertia, i.e. the mass of the rotating body 10, which is also Flywheel acts dependent.
  • the angular velocity ⁇ of the rotating body 10 is directly proportional to the root of the ratio of spring stiffness, ie the spring constant K and the mass m of the rotating body 10, exemplarily expressed by the equation ⁇ ⁇ K / m 0.5 .
  • the energy of the rotary body is set in such a way that the desired ⁇ , i.e. the desired angular velocity and the desired switching time for the respective switching process, results, with approx. 95% of the total energy of the system flowing into the switching process. Due to the very low-loss operating described switching system or coupling element, approximately 1.5 J of energy is lost in the system in an exemplary switching operation. In a conventional shifting process with a conventional drive, 20 to 30 times the energy is lost per shifting process with the same power and a comparable size of the coupling element.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Claims (8)

  1. Système de contact à fermeture pour des applications en haute tension, dans lequel il est prévu un tube (28) de commutation sous vide ayant deux contacts de coupure sous la forme de contacts (2, 4) en plaque, dont l'un au moins est un contact (30) mobile accouplé à un entraînement (5) et dans lequel au moins un contact (2, 4) en plaque est entouré à symétrie de révolution d'un élément (32) formant écran,
    caractérisé en ce que l'élément (32) formant écran à une conductivité électrique, qui est plus petite que 40 10-6 S/m et est conformé à base de fer et en ce que la distance entre les contacts (2, 4) en plaque, à l'état ouvert, est inférieure à 10 mm par tension nominale de 100 kV.
  2. Système de contact à fermeture suivant la revendication 1, caractérisé en ce qu'une vitesse de fermeture moyenne, qui se produit lors du déplacement du au moins un contact (30) en plaque déplacé, est comprise entre 2 m/s et 8 m/s.
  3. Système de contact à fermeture suivant l'une des revendications précédentes,
    caractérisé en ce qu'
    au moins un élément (32) formant écran entoure le contact (30) mobile.
  4. Système de contact à fermeture suivant la revendication 3, caractérisé en ce que l'élément (32) formant écran est monté mobile le long d'un axe (40) de commutation.
  5. Système de contact à fermeture suivant l'une des revendications précédentes,
    caractérisé en ce que la conductivité électrique de l'élément (32, 33) formant écran est inférieure à 20 10-6 S/m.
  6. Système de contact à fermeture suivant l'une des revendications 1 à 5,
    caractérisé en ce que la distance (36) entre les surfaces (34) du contact (2, 4) en plaque, à l'état ouvert, est plus petite que 8 mm par tension nominale de 100 kV.
  7. Système de contact à fermeture suivant l'une des revendications précédentes,
    caractérisé en ce que
    l'élément (32, 33) formant écran est à base d'un alliage de fer.
  8. Système de contact à fermeture suivant l'une des revendications précédentes,
    caractérisé en ce que l'entraînement (5) comprend un organe (2) d'entraînement pour la précontrainte d'une cinématique pendulaire de rotation à câble, dans laquelle un mouvement de rotation d'un corps (10) de révolution est, à l'aide de câbles (16) d'enroulement, transformé en mouvement de translation d'un corps (8) d'enroulement.
EP19752937.3A 2018-08-02 2019-07-24 Système de contact à fermeture Active EP3811391B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018212953.3A DE102018212953A1 (de) 2018-08-02 2018-08-02 Schließkontaktsystem
PCT/EP2019/069872 WO2020025410A1 (fr) 2018-08-02 2019-07-24 Système de contact de fermeture

Publications (3)

Publication Number Publication Date
EP3811391A1 EP3811391A1 (fr) 2021-04-28
EP3811391C0 EP3811391C0 (fr) 2023-08-30
EP3811391B1 true EP3811391B1 (fr) 2023-08-30

Family

ID=67620381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19752937.3A Active EP3811391B1 (fr) 2018-08-02 2019-07-24 Système de contact à fermeture

Country Status (7)

Country Link
US (1) US11462375B2 (fr)
EP (1) EP3811391B1 (fr)
JP (1) JP2021533539A (fr)
KR (1) KR20210030467A (fr)
CN (1) CN112534534B (fr)
DE (1) DE102018212953A1 (fr)
WO (1) WO2020025410A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113097007B (zh) * 2021-03-14 2023-07-25 郑州大学 一种基于均压环的输电等级双断口真空灭弧室

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US3727018A (en) * 1971-09-16 1973-04-10 Allis Chalmers Disk vacuum power interrupter
JPS5364259U (fr) * 1976-11-04 1978-05-30
DD131426B1 (de) 1977-06-17 1980-01-30 Eckehard Gebauer Schaltstueckanordnung fuer niederspannungs-vakuumschuetze
US4249050A (en) * 1977-12-30 1981-02-03 Tokyo Shibaura Denki Kabushiki Kaisha Vacuum switch
JPS5855606B2 (ja) * 1978-12-27 1983-12-10 株式会社明電舎 真空インタラプタ
JPS633067Y2 (fr) * 1980-11-05 1988-01-26
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DE10030670C2 (de) * 2000-06-23 2002-06-13 Siemens Ag Vakuumschaltröhre mit zwei Kontaktsystemen
JP2004186098A (ja) * 2002-12-06 2004-07-02 Mitsubishi Electric Corp 真空開閉装置
JP2006344557A (ja) * 2005-06-10 2006-12-21 Toshiba Corp 真空バルブおよびコンディショニング処理方法
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CN101226847B (zh) * 2008-02-05 2011-06-15 中国电力科学研究院 一种交流高压真空断路器
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US9875869B2 (en) * 2014-10-13 2018-01-23 Eaton Corporation Composite arc shields for vacuum interrupters and methods for forming same
DE102015200135A1 (de) * 2015-01-08 2016-07-14 Siemens Aktiengesellschaft Kopplungsglied für ein elektrisches Schaltgerät,insbesondere eine Vakuumschaltröhre
DE102016208270A1 (de) 2016-05-13 2017-11-16 Siemens Aktiengesellschaft Kopplungsglied für ein elektrisches Schaltgerät mit Impulsmasseelement
DE102016218355A1 (de) 2016-09-23 2018-03-29 Siemens Aktiengesellschaft Unterbrechbare Kabelmuffenanordnung
DE102018200450A1 (de) 2018-01-12 2019-07-18 Siemens Aktiengesellschaft Vakuumschaltröhre

Also Published As

Publication number Publication date
CN112534534A (zh) 2021-03-19
EP3811391C0 (fr) 2023-08-30
JP2021533539A (ja) 2021-12-02
DE102018212953A1 (de) 2020-02-06
WO2020025410A1 (fr) 2020-02-06
EP3811391A1 (fr) 2021-04-28
US20210304988A1 (en) 2021-09-30
CN112534534B (zh) 2024-04-05
US11462375B2 (en) 2022-10-04
KR20210030467A (ko) 2021-03-17

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