Classifications

• • 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
  • H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
  • H01T4/12—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel hermetically sealed

Definitions

• the invention relates to a surge arrester with low Anschpictant and its use.
• the ignition voltage In the interior of the surge arrester, when a certain limit voltage, the ignition voltage, is exceeded, an arc flashover occurs between two or the three electrodes.
• the threshold voltage is referred to as static or steady state stress with a rise of the voltage of 100 V / s as An MaschinenmaschineScience Uag and dynamic load with an increase of the voltage of 1 kV / ⁇ s as An Maschinenmonyschreib uas.
• the arc is maintained by the feeding current as long as the electrical conditions for the arc are met.
• One task to be solved is to specify a surge arrester, which has a low
• the surge arrester has an inner space which is formed by means of at least one insulating body, a center electrode and two side electrodes.
• the surge arrester is a three-electrode surge arrester. The electrodes of the
• Ubernapsableiters are connected in particular by means of at least one rohrformigen insulator, preferably at least one ceramic cylinder to the surge arrester.
• the surge arrester is with its extending in the region of the center electrode
• Side electrodes are arranged so that in the inner space, the distance between the side electrodes is greater than the distances between each of a side electrode and the center electrode, but smaller than between the end portions of the center electrode and a base of the side electrodes.
• the surge arrester is arranged so that the response surge voltage at a voltage increase of 1 kV / ⁇ s is less than 2.2 times the nominal DC response voltage and predetermined parameters of the center electrode and one of the side electrodes are the same.
• the surge arrester is cylindrical with an outer diameter of less than 8 mm.
• the surge arrester has a
• the surge arrester is advantageously characterized in that at a nominal DC voltage of 230 V, the Anschschhard is lower than 500 V and the Parameters for the nominal alternating current and the rated impulse current between each side electrode with respect to the center electrode are symmetrical and equal. Even if the nominal DC bias voltage varies by +/- 20%, the surge arrester will advantageously draw a threshold surge voltage lower than 500V.
• Surge arrester advantageously allows a 10-fold repetition of the load with the nominal alternating current.
• Jerk half-life of 20 ⁇ s this means a current of +/- 5 kA, which flows from each of the side electrodes to the center electrode.
• the surge arrester advantageously allows a 10-fold repetition of the load with the rated surge current.
• the surge arrester advantageously allows a 300-fold repetition of the load with this surge current characterizing the service life and load capacity.
• the interior of the Ubernapssableiters is sealed against the environment gas-tight. In the interior of the surge arrester there is a gas. This results the parameters of the surge arrester advantageously in a reproducible manner.
• the surge arrester in a telecommunication device, for example a
• Telecommunications network used; but it is not limited to telecommunications networks and can also be used in any other electrical circuit in which high voltages must be dissipated by means of a surge arrester.
• the surge arrester used in any other electrical circuit in which high voltages must be dissipated by means of a surge arrester.
• Surge arrester suitable for lightning protection applications, in which the surge arrester is at least temporarily at symmetrical voltages to earth, or may be.
• the center electrode is composed of a tube part, in particular of copper, and a ring part, in particular of iron-nickel.
• the pipe part either has a constant wall thickness or contains a bead in the region of the ring part.
• Surge arrester contains an addition of hydrogen.
• the proportion of hydrogen may be between 5% and 30%; however, about 20% hydrogen is typical. As a result, the build-up time for a discharge when the surge arrester responds is shortened and the surge voltage decreases.
• the interior contains on the inner wall of the insulating several Zundstriche.
• the fuses are either electrically connected to one of the side electrodes and extend into the discharge back space behind the center electrode, but not deep into the back space of the other side electrode. This will be
• the pin-shaped side electrodes have a waffling of the surface on the front side in order to receive an activation mass in the depressions.
• the activation mass has a positive effect on a discharge structure and its reproducibility.
• FIG. 1 shows a sketch of a surge arrester in partial cross-section with side electrodes and a center electrode
• Figure 2 shows a side electrode of a
• FIG. 3 shows a schematic sketch of a
• FIG. 4 shows a sketch of a surge arrester in the partial cross section with side electrodes and a center electrode for an SMD assembly
• FIG. 5 shows a schematic sketch of an SMD-mountable surge arrester with short-circuiting ball
• FIG. 6 shows a schematic sketch of a
• FIG. 1 shows a first embodiment of a surge arrester 1 in the (partial) cross section.
• the surge arrester has two side electrodes composed of two parts 2a, 2b and 3a, 3b.
• Surge arrester is sealed gas-tight and contains a gas which has a hydrogen content of between 5% and 30%, but in particular a proportion of 20%.
• the side electrodes have on the outside a FeNi disc 2a, 3a, which is copper-plated.
• the discs are stampings or Kaltf facilitatorpressmaschine.
• the disks With a solder joint 9 by means of a SCP or AgCu solder or with a welded joint, the disks are each composed of an electrode 2b, 3b protruding into the interior from copper.
• Each electrode 2b, 3b is a rotary part or a cold extruded part and has a napfformigen electrode foot soldered to the disc 2a, 3a and a pin-shaped part, the front side has a waffle 8 for receiving an activation mass.
• the diameter of the electrode foot is selected to drive the electrode in the ceramic tube 4.
• the pin-shaped part of each side electrode 2, 3 projects into the tubular region of the center electrode 5.
• the distance of the end faces of the side electrodes is A.
• the electrode base has in the embodiment of Figure 1 has a diameter Dl of 2.8 mm, while the pin-shaped Part has a diameter D2 of 1, 6 mm, see Figure 2.
• the inner diameter of the insulating body 4 amounts to 2.8 mm.
• the center electrode 5 is assembled according to FIG. 3 from a tube part 5b with a small wall thickness and a ring part 5a.
• the tube part 5b is made of copper or an iron-nickel alloy, which is preferably copper-plated.
• the length of the pipe part is such as to shade the insulating bodies 4a, 4b in the event of a discharge and prevent a discharge of a discharge into the region of the insulating body.
• the distance B of the edge of the pipe part 5b from the foot of the side electrode 2b, 3b is larger than the inner electrode gap C in the radial direction. This safely prevents a side discharge.
• the pipe part is pasted in a particularly advantageous execution with an activation mass.
• the distance A in the longitudinal direction is greater than the distance C in the radial direction, but smaller than the distance B.
• A 0.56 mm
• B 0.68 mm
• C 0.4 mm.
• the outer diameter of the tube part 5b is about 2.8 mm, but in any case is slightly smaller than the inner diameter of the insulator.
• the tube part 5b is enclosed by a ring part 5a, preferably of an iron-nickel alloy.
• the ring part can be coppered. With the ring member let the center electrode lead symmetrically to the insulators.
• the center electrode is produced in accordance with FIG. 3 by means of a soldering 11 or by a matching internal meshing or by spot welding with the aid of a laser produced.
• the pipe 5b is positioned concentrically in the ring 5a during pre-assembly and firmly dotted at least one side by one or more welds in the gap between the tube 5b and the ring 5a.
• An electrically reliable contact between the tube 5b and the ring 5a is then ensured in the case of the sealing soldering, for example by means of a resting solder foil.
• the Elektrodenbowung the center electrode on the inner wall of the insulating 4 is carried out expediently during the sealing of the Uberschreibsableiters on the higher thermal expansion coefficient of the metallic center electrode 5 relative to the insulating body 4 made of ceramic. Also, the side electrodes are guided during the Ver gleichlotung on the inner diameter of Keramikisolierkorpers.
• the surge arrester has on the inner wall of the insulating body 4 Zundstriche 6.
• the fuses 6a are connected to a side electrode and do not extend beyond the middle of the surge arrester.
• Fuses 6b protrude into the discharge space, but are not connected to any electrode.
• FIG. 4 differs from FIG. 3 in that the surge arrester is SMD-capable. This has the
• Outer disk 3c of the side electrode 3 has an approximately square shape.
• the tube part 5c of the center electrode has a bead in the region of the ring part.
• FIG. 5 shows a surge arrester according to FIG. 4, whose center electrode has a welded-on shorting bar 12, which is insulated from the side electrodes by means of a foil 13.
• the shorting ball is made of CuBe, the film of Hostaphan or polypropylene.
• FIG. 6 shows a surge arrester according to FIG. 1 with shorting bar 12 and threefold external wiring 14, 15 and 16 of the three electrodes.
• Impact current i S N 10 kA at 8/20 ⁇ s, and 10x repetition, each with the amount of 5kA between a side electrode and the center electrode and
• LD 200A at 10/1000 ⁇ s and 30Ox surge currents at 100A each between a side electrode and the center electrode.

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• Emergency Protection Circuit Devices (AREA)
• Thermistors And Varistors (AREA)

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Citations (5)

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• 2007
  • 2007-12-28 DE DE102007063316A patent/DE102007063316A1/de not_active Ceased
• 2008
  • 2008-12-22 KR KR1020107016857A patent/KR20100098720A/ko not_active Ceased
  • 2008-12-22 JP JP2010540073A patent/JP5554721B2/ja not_active Expired - Fee Related
  • 2008-12-22 EP EP08868256A patent/EP2229716B1/de not_active Not-in-force
  • 2008-12-22 CN CN200880123992.XA patent/CN101911408B/zh active Active
  • 2008-12-22 AT AT08868256T patent/ATE552635T1/de active
  • 2008-12-22 WO PCT/EP2008/011094 patent/WO2009083239A1/de not_active Ceased
• 2010
  • 2010-06-17 US US12/817,917 patent/US8189315B2/en not_active Expired - Fee Related

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