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
  • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure

Definitions

• Surge arrester with at least one diverting element, for example a varistor
• the invention relates to a surge arrester having at least one
• Discharge element for example, a varistor and a separator from device to one or the Ableitiata one or all poles to disconnect from the network
• the separating device comprises a solder joint, which is integrated into the electrical connection path within the arrester, wherein on the solder joint, a movable conductor section or a movable conductive bridge is connected to the diverter element on the one hand and the conductor section or the bridge on the other hand to an electrical outer terminal of the arrester, and furthermore comprising a biasing force generating spring, wherein the relevant force vector acts directly or indirectly on the conductor section or the bridge in the separation direction, according to the preamble of patent claim 1.
• a solder joint is arranged as a thermal fuse in which one of the soldered supply line parts with a, this supply line in the direction away from the soldering biasing spring is in communication.
• the supply line can be designed as a flexible, rope-like conductor, but here problems occur at high surge currents.
• the bridge considered in cross section double L-shaped.
• the two supply line sections connected by the bridge can be arranged relatively far apart in this way. It is also previously known to provide the bridge according to EP 0 905 839 Bl at one end with a web on which a spring which generates a prestressing force is fixed.
• EP 0 905 839 B1 to provide an optical defect display, comprising an opening arranged in the end face of the opening and a movably mounted in the interior of the upper part of the lever, which extends from the region of the opening into the path of movement of the conductive bridge and the first, in the region of Opening end carries a signal plate.
• the signal plate has, on its surface facing the opening, a marking which is typical for the corresponding operating state. The marking can be moved by the bridge at the ⁇ réellesDschi taking into account the existing lever from a non-visible through the opening in a viewable position.
• the solder joint which holds the bridge under spring biasing force, has a solder with a defined melting point.
• the melting point is chosen so that it is not yet reached with heat energies that the arrester can absorb undamaged.
• the solder joint thus remains effective as long as the surge arrester is undamaged but is released at higher heat energies.
• the latter in turn, means that the spring biasing force, which acts on the bridge and the corresponding solder joint, is subject to a narrow limitation.
• limited spring force is detrimental to rapid separation of the rigid bridge member, especially if there is no immediate penetration of the solder joint due to the eutectic behavior of the solder.
• the basic idea of the invention is that in addition a thermally actuable blocking element blocks the movable conductor section or the intended movable conductive bridge with respect to the permanently acting prestressing force vector so that the soldering point of the separating device is not subjected to permanent force-side loading.
• the sensitive solder joint of the electrical isolation device is not permanently one
• Locking element on the one hand in an Abwinklungs Scheme of the conductor section and on the other hand counteracted on the arrester housing or a housing partition wall of the arrester and standing with the arrester in thermal, heat-conducting contact.
• thermoly triggered locking element as a bolt-like part of the movement of a lever translation, which is arranged between the spring and the conductor section.
• the thermally actuable blocking element can be made as a preformed part from a low-melting solder or be manufactured in such a way.
• the properties of the solder for the thermally-releasable blocking element can be determined solely from the mechanical point of view, e.g. high tensile strength, can be selected.
• the movable conductor section can be designed as a spring tongue be, so here is a further support of the separation movement in case of failure is given.
• the leverage can be associated with an optical defect indicator to signal the failure or failure state of the diverter element.
• the movable conductor section is a
• Punched-bent part which has a molded external connection, in particular in the form of a plug-in contact.
• this part can be manufactured inexpensively and easily assembled without much effort.
• Activation temperature of the blocking element is less than the melting point of the solder joint.
• a lever part travels a first way to get into abutment with the conductor section or the bridge, then this distance traveled can be used to trigger a telecommunications contact or an optical display, which signals that a critical Temperature increase took place in order to indicate in this way that it is expedient to replace the surge arrester.
• Biasing force which is preferably generated with a spring arrangement, assume a higher value compared to the possible continuous load of the solder joint in order to ensure the desired very fast separation movement of the conductor section or the conductive bridge in case of failure.
• FIG. 1 shows a first exemplary representation of the solution according to the invention with a solder preform, which is located in the disconnection frame in thermal contact with a varistor disk,
• FIG. 2 shows an embodiment in which the solder preform of the blocking element acts directly on or is arranged on the conductor section and via an abutment in the
• Figures 3 and 4 show a third embodiment of the invention with two stages
• This base part 1 has a rear recess with means for DIN rail mounting 2. [034] In the space formed by the two legs of the U-shaped base part 1, the actual surge arrester 3 is inserted. Appropriate
• Base part 1 a An encoding 6 on the one hand in the base part 1 and on the other hand in
• Surge arrester 3 prevents the insertion of incorrect or inappropriate
• the surge arrester 3 has in its interior the actual arrester (not shown), e.g. a varistor disc. [036]
• the varistor disk located behind the partition wall 7 has two
• a first terminal 8 is connected to the left-side plug contact 4 via
• a second terminal 10 is passed through the partition wall 7 and connected there via a solder joint 11 with a movable conductor section 12.
• the movable conductor section 12 is arranged in the right side
• a lever-like cut-off block 13 has an optical top side
• a first end of a spring 15 engages adjacent to the optical defect indicator 14, wherein the second end of the spring 15 is fixed in the region of the dividing wall 7.
• the spring 15 causes a biasing force via the disconnecting block 13 and the plunger 16 on the movable conductor portion 12 and thus the solder joint 11.
• the surge arrester 3 also has a housing 18 with a window 19 with respect to the optical defect display 14.
• FIG. 2 is assumed by a similar construction as explained for Fig. 1.
• thermally releasable blocking element 17 is not located as a locking pin in the separation block, but in the region of the movable conductor portion 12 and symbolized by the reference numeral 20.
• the movable conductor section 12 can be manufactured in one piece with the right-hand plug-in contact 4 as a stamped and bent part and used to facilitate assembly.
• Figs. 3 and 4 show a third embodiment of the invention with two-stage load or fault indication.
• FIG. 3 illustrates the state in which no critical ther-dynamic loads have yet occurred for the surge arrester and in which the blocking element 17 has not yet been triggered.
• FIG. 4 shows the state after release of the blocking element 17.
• Locking element 17 part of a two-stage load or De StammD display with a hinged lever arm 28 is present, the lever arm 29 engages in a locking slide 24.
• This locking slide 24 is in mechanical contact with a stop 27 of a bridge actuating part 23 and blocks this bridge actuating part 23 in the state according to FIG. 3.
• the bridge operating member 23 is held under bias of a spring 15 and has a recess 26 in which a nose 25 of the conductive bridge 22 engages.
• Locking slide 24 is, as shown in Fig. 3, detail A, a clearance between the recess 26 and the nose 25 is present, which means that the force of the spring 15 is not transferred to a critical solder joint extending between the bridge 22, the respective terminal of the diverter and the plug contact 4 is located.
• the lever arm 28 of the locking element 17 is held by a solder pin or plunger 30 as the actual thermal barrier element, wherein the melting temperature of this solder pin or Lotbolzens 30 may be smaller than the temperature of the solder, which the bridge 22 with the respective terminal of the diverter and the plug contact 4 connects.
• Hebelarmende 29 in a groove-shaped recess of the locking slide 24 in order to take this movement side can.
• the bias of the spring 15 can be made very large, without causing an unwanted mechanical permanent load on the bridge-side solder joint or several solder joints located there.
• this higher bias of the spring 15 causes a very rapid opening and thus separating the diverter in the load case. Due to the arrangement of the solder pin or soldering bolt 30 directly on or in the partition wall 7 and thus in the immediate vicinity of the diverter, the heat generated in this element in the load case is passed directly to the solder pin or bolt 30, so that for a safe response of the solder material in the sense of desired thermal tripping is ensured.
• the bridge actuating part 23 may have a tongue 33 for receiving the spring 15, which at the same time serves to guide the bridge actuating part 23 by means of spaced guide elements 34.

Landscapes

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

Priority Applications (4)

Applications Claiming Priority (4)

Publications (1)

Family

ID=37941483

Family Applications (1)

Country Status (7)

Cited By (9)

Families Citing this family (9)

Citations (2)

Family Cites Families (4)

• 2006
  • 2006-08-10 DE DE102006037551A patent/DE102006037551B4/de not_active Expired - Fee Related
• 2007
  • 2007-02-12 WO PCT/EP2007/051318 patent/WO2007093572A1/de active Application Filing
  • 2007-02-12 JP JP2008553783A patent/JP5050147B2/ja not_active Expired - Fee Related
  • 2007-02-12 DE DE502007000217T patent/DE502007000217D1/de active Active
  • 2007-02-12 RU RU2008135716/07A patent/RU2407087C2/ru not_active IP Right Cessation
  • 2007-02-12 CN CN2007800015645A patent/CN101361145B/zh not_active Expired - Fee Related
  • 2007-02-12 AT AT07717672T patent/ATE413684T1/de not_active IP Right Cessation
  • 2007-02-12 EP EP07717672A patent/EP1854109B1/de not_active Not-in-force

Patent Citations (2)

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