Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01C—RESISTORS
  • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
  • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
  • H01C7/12—Overvoltage protection resistors
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
  • H01T4/00—Overvoltage arresters using spark gaps
  • H01T4/02—Details

Definitions

• the invention relates to a surge arrester according to the preamble of patent claim 1.
• Overvoltage arresters are protective systems, for example, for switchgear systems which, given overvoltages caused by lightning strikes or malfunctions of other subsystems, dissipate these overvoltages to ground and thus protect other components of the switchgear.
• Such a surge arrester comprises one or more cylindrical diverting elements, which have a varistor column made up of individual, likewise cylindrical varistor elements.
• Varistor elements are characterized by a voltage-dependent resistance. At low voltages these act as insulators. From a certain threshold voltage, which is material-dependent, they show a good conductivity.
• varistor elements are made of metal oxides such as zinc oxide.
• the diverting element is limited at both ends by end ⁇ fittings which make electrical contact to the switching ⁇ plant and to ground. To ensure a good electrical contact even under mechanical stress, the varistor column must be held together under pressure. This can be done by tension members, for example, ropes or rods are preferably clamped in glass fiber reinforced plastic in the end fittings under train. The tension elements surround the varistor column and form a cage around them.
• the housing is usually made of metal and is electrically grounded.
• An end fitting of the Conductor column is grounded via a guided through the housing contact.
• the other end fitting is electrically connected via a passage with a contact located on the outside of the housing, which serves to connect to the switchgear.
• surge arresters which have a separation point, with which the surge arrester can be disconnected from the switchgear. To actuate this separation point, the housing must be opened, whereby
• Sulfur hexafluoride can escape. Since sulfur hexafluoride is a harmful greenhouse gas, this is highly undesirable and thus detrimental.
• a surge arrester in which the control hood can be moved against the diverting element and so a separation point can be opened or closed.
• a disadvantage of the solutions of the prior art is that a complex mechanism is necessary that large masses must be moved and that the space requirement is high.
• Object of the present invention is to provide a compact surge arrester, the one from the outside
• the invention provides an overvoltage arrester with a fluid-tight housing.
• the housing has a ground contact and a high voltage contact, wherein the ground contact and the high voltage contact each electrically connect the interior to the exterior of the housing.
• a discharge element arranged in the housing has a delivery column clamped between two end armatures by means of tension elements.
• a displaceable by means of a displacement device in an axial direction contact member outside the housing an electrical connection from the ground contact to the high voltage contact ⁇ over the diverting element is produced from relate hung example interrupted.
• the contact element is guided in a bore of an end fitting. This makes the surge arrester very compact.
• a mechanically simple but reliable construction is possible by the leadership of the contact element in the bore of the end fitting.
• the contact element is resiliently connected to the displacement device in the axial direction.
• a plurality, in particular three, diverting elements are each arranged with a contact element in the housing.
• the housing for each Ableitele ⁇ ment each have a high voltage contact and the contact elements are jointly displaceable by means of the displacement device.
• the shifting means depending on a discharge element connected to the contact element thrust Stan ⁇ ge.
• the displacement device has a gas-tight guided from the interior of the housing to the outside and outside of the housing by an actuator movable central rod.
• a coupling element with the central rod and the push rods is connected to transmit a movement of the actuator to the contact elements.
• the central rod with the coupling element forms a threaded drive, which transmits a rotary movement of the central rod into a linear movement of the coupling element.
• the central rod has an external thread, the coupling element a corresponding internal thread.
• both threads are trapezoidal threads. This allows ⁇ be particularly simple set and compact drive for the movement of the contact elements.
• FIG. 1 shows a surge arrester according to the invention in a sectional illustration with a closed separation point
• FIG. 2 shows a surge arrester according to the invention in a sectional illustration with an opened separation point
• FIG. 3 is a detail of the coupling element.
• FIG. 4 shows a detailed representation of the separation point
• FIGS 1 and 2 show a surge arrester 1 in a sectional view.
• three discharge elements 5 are arranged here, which are provided for the protection of a three-phase gas-insulated switchgear.
• DIE se dissipation elements 5 each have a cylindrical bleeder ⁇ column 12, a high-voltage side end fitting 7, a ground side end fitting 6 and a plurality of tension elements.
• the Ableit yarn 12 is composed of individual, also cylindrical Varistorblöcken.
• the end fittings 6, 7 are usually made of electrically conductive material.
• the tension members 12 are pressed in the end fittings 6, 7 under train and so keep the Ableit yarn 12 together.
• retaining discs 24 are inserted, which have holes through which the tension members 12 are guided and thus stabilize the discharge element 5 additionally.
• the housing 2 is substantially cylindrical. Along the cylinder axis extends the longitudinal axis 50, which defines an axi ⁇ ale direction. The diverting element 5 is aligned along this longitudinal axis 50. At the two top surfaces, the housing 2 is closed fluid-tight.
• the top surface of the housing 2 is closed with a simple housing cover 22.
• a ground contact 3 is electrically insulated by this housing cover 22 from the inside to the outside of the housing 2 and serves the ground terminal. Inside the housing 2, this earth contact 3 is connected in an electrically conductive manner to the diverting element 5, for example, with a cable 13.
• the earth-side end fitting 6 is fixed to the housing cover 22 and electrically insulated from the Ableitklale 12 by an insulating spacer 25.
• the housing cover 22 generally has a connection, not shown here on, via the fluid, for example, sulfur hexafluoride, filled in the housing 2, or can be discharged.
• the housing 2 may also have other facilities such as a maintenance opening 21.
• the top surface of the housing 2 is provided with a high-voltage bushing 14 to lead the electrical high-voltage potential into the housing 2 from the outside without the risk of a flashover between the high voltage and the earthed housing 2.
• the bushing 14 is designed here as a three-pole feedthrough 14, which leads three high voltage contacts 4, insulated against each other and against the housing, into the housing 2.
• the high voltage contacts 4 the
• Surge arrester 1 can be connected to a three-phase gas-insulated switchgear not shown here.
• the high-voltage contacts 4 protrude into the housing 2 like a finger.
• the distance between the high-voltage side end fitting 7 and respective high-voltage contact 4 forms a separation point 10.
• This separation point 10 can be closed with a contact element 9 ge ⁇ .
• This contact element 9 is designed as a pin or sleeve cylindrical, and can be moved in a bore 26 of the high-voltage side end fitting 7 in the axial direction. Bore 26 and contact element 9 are coordinated so that both a mechanical guide, as well as a good electrical connection between the contact element 9 and end fitting 7 is made. Alternatively you can
• the coupling element 17 is disposed inside the housing 2.
• Central rod 16 and coupling element 17 thereby form a threaded drive by the central rod 16 has an external thread and the coupling element 17 has a corresponding internal thread, for example a trapezoidal thread.
• On the coupling element 17 a radially outwardly pointing arm 19 is arranged per discharge element 5, at the outer end of a connecting element 20 for receiving the push rods 15 is arranged ⁇ .
• FIG. 3 shows such a coupling element.
• the push rods 15 are fixed at one end in this connecting element 20 and connected to the other end with the contact element 9.
• the connection of the push rod 15 with the contact element 9 is as shown in Figure 4 spring out of ⁇ out.
• the push rod 15 is inserted into a bore 30 of the contact element 9.
• An annular collar 33 forms a stop for a spring 32 shown here as a helical spring, which is adoptedfä ⁇ delt on the end of the push rod 15.
• a shoulder at the transition of the bore 30 to a further bore 31 in diameter forms a further stop for the spring 32.
• the bore 31 is closed at the end with a stopper 34, through which the push rod 15 is guided. The plug 34 prevents the push rod 15 can be pulled out of the bore 31 out.
• the pull rod 16 rotates inside the housing 2 and transmits the rotary movement of the actuator 23 by means of the coupling element 17 on the push rods 15 and thus on the contact elements 9. Depending on the direction of movement while the separation point 10 is opened or closed.

Landscapes

• Engineering & Computer Science (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Gas-Insulated Switchgears (AREA)
• Emergency Protection Circuit Devices (AREA)
• Thermistors And Varistors (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=49253257

Family Applications (1)

Country Status (6)

Cited By (2)

Families Citing this family (12)

Citations (3)

Family Cites Families (6)

• 2012
  • 2012-09-25 DE DE102012217310.2A patent/DE102012217310A1/de not_active Withdrawn
• 2013
  • 2013-09-05 JP JP2015532362A patent/JP6025988B2/ja active Active
  • 2013-09-05 EP EP13766914.9A patent/EP2885789B1/de active Active
  • 2013-09-05 KR KR1020157007538A patent/KR101733899B1/ko not_active Application Discontinuation
  • 2013-09-05 WO PCT/EP2013/068353 patent/WO2014048691A1/de active Application Filing
  • 2013-09-05 CN CN201380048209.9A patent/CN104641428B/zh active Active

Patent Citations (3)

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