EP0170171A2 - Dispositif de coupe-circuit électrique - Google Patents

Dispositif de coupe-circuit électrique Download PDF

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Publication number
EP0170171A2
EP0170171A2 EP85109067A EP85109067A EP0170171A2 EP 0170171 A2 EP0170171 A2 EP 0170171A2 EP 85109067 A EP85109067 A EP 85109067A EP 85109067 A EP85109067 A EP 85109067A EP 0170171 A2 EP0170171 A2 EP 0170171A2
Authority
EP
European Patent Office
Prior art keywords
safety device
tension
wire
tensioning
tension wire
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.)
Withdrawn
Application number
EP85109067A
Other languages
German (de)
English (en)
Other versions
EP0170171A3 (fr
Inventor
Ludwig Dr. Schultz
Ludwig Pohl
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.)
Jean Mueller Elektrotechnische Fabrik GmbH
Original Assignee
Jean Mueller Elektrotechnische Fabrik GmbH
Siemens Corp
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 Jean Mueller Elektrotechnische Fabrik GmbH, Siemens Corp filed Critical Jean Mueller Elektrotechnische Fabrik GmbH
Publication of EP0170171A2 publication Critical patent/EP0170171A2/fr
Publication of EP0170171A3 publication Critical patent/EP0170171A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
    • H01H85/303—Movable indicating elements

Definitions

  • the invention relates to an electrical safety device, in particular for high-voltage and / or high-current devices, which contains at least one fusible conductor, which is wound on a carrier body and at least partially surrounds a device which indicates the response of the safety device and which has a movable bolt. which is provided for tensioning a spring element with a predetermined tensioning force via a tensioning wire connected to it and tearing under the tensioning force when the securing device responds, and with which, if necessary, an associated switching device can be actuated.
  • a fuse device is indicated in the Siemens catalog HG 12 (1979): "High-voltage switchgear up to 36 kV; switch disconnectors, HV fuses", part 2.
  • High-voltage high-performance (HH) fuses are used as short-circuit protection in high-voltage switchgear for frequency ranges between 50 and 60 Hz. Used in front of transformers, capacitors and cable branches, they protect devices and system parts from the dynamic and thermal effects of high short-circuit currents by switching them off as they arise.
  • fuse devices of this type are not suitable as overload protection, since they can only switch off with certainty from a predetermined minimum breaking current. This smallest breaking current is generally 2.5 to 3 times the nominal current.
  • a current in the range between the nominal current and the breaking current is therefore not switched off with this type of fuse device.
  • the safety device and the component to be protected are consequently exposed to thermal overload. For this reason, additional protective measures are often provided for this current range.
  • the high-voltage fuse device which can be gathered from the publication mentioned at the beginning contains one or more, in parallel, strip fuse elements with constriction areas which are wound on a ceramic tube with a star-shaped cross section.
  • a tubular striking device which is open on one side and has a movable striking pin or bolt.
  • This striking pin is drawn into the striking device up to its plate-shaped head part by means of a tension wire, whereby it compresses a compression spring with a predetermined tensioning force.
  • This tension wire lies in a parallel current path to the fuse element. Since it has a much higher resistance than the fuse element, only a very small current flows through it during operation.
  • the striker can be a special one Actuate the switching state transmitter of the fuse device or a triggering device of a switch disconnector assigned to the fuse device.
  • the object of the present invention is now to design the known fuse device such that it responds not only when the fuse element melts, but also in the event of thermal overload below the triggering current leading to the fuse element melting through when a predetermined temperature is exceeded and thus, if appropriate, by means of a series placed switching device interrupts a circuit.
  • the tension wire consists at least partially of an amorphous material that at least largely crystallizes at a predetermined temperature due to a corresponding heating power of the fuse element when it is overloaded and therefore tears under the tension of the spring element.
  • the amorphous metal Due to the use of an appropriate tension wire, thermal overload protection for the area between the nominal current and the tripping current of the safety device can consequently also be achieved.
  • the amorphous metal has a high tensile strength in the amorphous state, but tears after crystallization under the applied tension. If a current flows through the fuse device, ie through its fuse element, which is greater than the nominal current but less than the triggering current at which the fuse element melts, the fuse element heats up accordingly. Due to the associated heating effect of the fuse element, this will be amorphous metal is heated by heat conduction or convection to the point where its crystallization temperature is reached.
  • the amorphous metal becomes brittle, tears under tensile stress and releases the bolt, which in turn can actuate an upstream triggering device of a switching device. Since this heating effect occurs below the tripping current by means of the fusible conductor, the device according to the invention advantageously also detects an overload of the safety device.
  • the known function of the tension wire namely to indicate a blown fuse element, is still fulfilled. If an arc arises in the fuse device when the fuse element melts, a current flows through the tension wire due to the arc voltage, which heats the amorphous metal above the crystallization temperature and triggers the display mechanism due to the resulting tear in the tension wire.
  • Such a function of the tension wire made of an amorphous material is known per se (cf. DE-OS 27 42 966).
  • the securing device contains a tubular support body 3, for example arranged in a porcelain tube not shown in the figure, which e.g. consists of ceramic material, has an approximately star-shaped cross section and is provided with ribs 6.
  • a band-shaped fuse element 4 is wound onto this carrier body 3 and is provided with constriction regions 5 in a known manner. If necessary, several such fusible conductors connected in parallel can also be provided.
  • the fusible link (s) 4 are generally enclosed on all sides in a fine-grained extinguishing agent such as Quartz sand embedded.
  • a special mechanical device 7 is arranged within the tubular support body 3 with the fuse element 4, with which the response of the safety device can be displayed.
  • this device which is also referred to as a striking device, the trigger mechanism of an associated switching device, such as e.g. of a load break switch.
  • the display or impact device 7 has a cladding tube 8 which is open on one side and which is provided on the opposite side with a fixed base part 9.
  • a spring element 10 for example a steel spring, is introduced into the cladding tube from the open side and is to be pressed together by means of a longitudinally T-shaped striking pin 11, which is also referred to as a striking pin.
  • This serves a special tensioning wire 12, which is connected to the foot part 13 of the firing pin 11 and is guided through bores 14 in the fixed bottom part 9.
  • this tensioning wire By means of this tensioning wire, the spring element 10 can be compressed over the head part 15 of the firing pin 11 and fixed in this position by means of crimp sleeves 16 to be attached outside the cladding tube 8.
  • This tension wire 12 which according to the invention is to consist of a special amorphous metal, is generally connected in parallel to the fusible conductor 4.
  • the tension wire can also have other shapes, such as a band shape. Due to the choice of material for the tensioning wire according to the invention, not only is a blow triggered in the direction of action of the firing pin 11 indicated by an arrow 18 when the fuse element 4 melts and the melting of the tension wire 12 associated therewith, but the striking device 7 also speaks in the event of thermal overload, that is to say when Exceeding a previously definable temperature in a range in particular between 100'C and 600 * C.
  • the thermal overload protection is in fact given that the amorphous metal has a high tensile strength in the amorphous state, but tears after crystallization under the applied tension due to the tension force or the pressure force K of the spring element 10. If a current now flows through the fuse device that is greater than the nominal current specified for the fusible conductor 4, the amorphous metal is heated by thermal conduction or convection to such an extent that its crystallization temperature is at least largely reached. The amorphous metal becomes brittle, tears under the compressive stress K of the spring element 10 and thus releases the firing pin 11, which in turn can actuate an upstream switch.
  • the previous one Known embodiments exercised function of the tension wire, namely the display of a blown fuse is still fulfilled. If an arc arises due to the fuse element 4 burning out, a current also flows through the tension wire due to the arc voltage, which heats the amorphous metal above the crystallization temperature and thus triggers the display mechanism.
  • the trigger temperature is determined by the crystallization temperature, which depends on the composition of the amorphous metal. It is not a sharply defined value, but depends on the temperature-time curve. The faster the heating takes place, the higher the temperatures, the more crystallization takes place; but also faster.
  • the crystallization temperature for a specific heating rate is generally given as a guideline. It lies e.g. at 20'C / sec.
  • amorphous metals When choosing the amorphous metal, its relaxation behavior must be taken into account. As is well known, amorphous metals are metastable and, even below the so-called glass temperature, are not in equilibrium with regard to their glass-like state. This can lead to structural relaxation and thereby flow of the material, it being possible for the predetermined tensile stress generated in the present exemplary embodiment by the compression spring 10 to be reduced. However, if the amorphous material relaxes too much before embrittlement, the tensile stress can be reduced to such an extent that it is no longer sufficient for subsequent tearing. For this reason, an amorphous material is advantageously used which has undergone a previous relaxation annealing in the unloaded state because the subsequent stress relaxation can be greatly reduced.
  • the entire system (specified tension, spring constant, relaxation behavior of the amorphous metal, length of the tension wire) can be adjusted so that even with a slow heating rate, the relaxation-related expansion of the tension wire does not allow the specified tension to drop below the tension ultimately required for tearing.
  • various amorphous tapes of different composition were loaded with 2.5 kp tensile stress and slowly heated as tension wire.
  • the table below shows the release temperatures of the different belts:
  • all metallic strips or wires that can be created in amorphous form are suitable for the application.
  • the generally known amorphous metals of the transition metal-transition metal type are also suitable. It is advisable to select a corrosion-resistant material, such as one containing Cr Metal-metalloid alloys. In order to achieve lower release temperatures, Co-containing alloys of the same type can advantageously also be provided.
  • the pretreatment of the strips or wires is also important, especially with regard to the relaxation behavior. Both the manufacturing parameters and the relaxation annealing are important.
  • the specific design of the striking device 1 can remain essentially unchanged from previously known embodiments. However, since it is known that amorphous metals have a very high tensile strength and a relatively high electrical resistance, instead of the tension wire, which is generally designed as a multiple pulley block in the known embodiments, a single or double pulley block can possibly be used.
  • thermal overload protection in electrical safety devices of the type mentioned at the outset by using an impact device with amorphous metal is of course not restricted to use in high-voltage, high-performance fuses. In general, this principle can be used wherever a thermal overload of fusible conductors is indicated below a switch-off current sufficient to melt them and / or a switching device is to be actuated mechanically in the event of this thermal overload.

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  • Fuses (AREA)
EP85109067A 1984-08-02 1985-07-19 Dispositif de coupe-circuit électrique Withdrawn EP0170171A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3428568 1984-08-02
DE19843428568 DE3428568A1 (de) 1984-08-02 1984-08-02 Elektrische sicherungseinrichtung

Publications (2)

Publication Number Publication Date
EP0170171A2 true EP0170171A2 (fr) 1986-02-05
EP0170171A3 EP0170171A3 (fr) 1987-09-16

Family

ID=6242239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109067A Withdrawn EP0170171A3 (fr) 1984-08-02 1985-07-19 Dispositif de coupe-circuit électrique

Country Status (3)

Country Link
EP (1) EP0170171A3 (fr)
DE (2) DE8423056U1 (fr)
ES (1) ES8609813A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998007171A1 (fr) * 1996-08-08 1998-02-19 Siemens Aktiengesellschaft Cartouche fusible a indicateur, notamment indicateur central
FR2958074A1 (fr) * 2010-03-29 2011-09-30 Ferraz Shawmut Fusible et interrupteur sectionneur comprenant un tel fusible
WO2011121216A1 (fr) * 2010-03-29 2011-10-06 Mersen France Sb Sas Fusible et interrupteur sectionneur comprenant un tel fusible

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3608084A1 (de) * 1986-03-07 1986-09-18 Ernst Prof. Dr.techn.habil. 13595 Berlin Slamecka Vakuum-hochspannungs-sicherungseinsatz
ES2113295B1 (es) * 1995-08-04 1999-01-01 Manufacturas Electricas S A Mejoras en fusibles limitadores de media tension de corte integral.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1039891A (en) * 1963-07-10 1966-08-24 E M P Electric Ltd Improvements in trip devices for electric fuses
DE1463655A1 (de) * 1964-11-24 1969-03-27 Siemens Ag Sicherung,insbesondere strombegrenzende Hochspannungssicherung,mit einer Schlagvorrichtung zur Ausloesung eines Schalters
DE1920825A1 (de) * 1969-04-24 1970-11-05 Fritz Driescher Spez Fabrik Fu Hochspannungs-Hochleistungssicherung
DE7016823U (de) * 1970-05-05 1970-08-20 Wickmann Werke Ag Schlagstift fuer eine vorrichtung an elektrischen sicherungen.
US4085396A (en) * 1976-09-27 1978-04-18 Bell Telephone Laboratories, Incorporated Electric fuse
CH622380A5 (fr) * 1977-12-21 1981-03-31 Bbc Brown Boveri & Cie

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998007171A1 (fr) * 1996-08-08 1998-02-19 Siemens Aktiengesellschaft Cartouche fusible a indicateur, notamment indicateur central
EP0828279A1 (fr) * 1996-08-08 1998-03-11 Siemens Aktiengesellschaft Cartouche à fusible avec indicateur, notamment indicateur central
FR2958074A1 (fr) * 2010-03-29 2011-09-30 Ferraz Shawmut Fusible et interrupteur sectionneur comprenant un tel fusible
WO2011121216A1 (fr) * 2010-03-29 2011-10-06 Mersen France Sb Sas Fusible et interrupteur sectionneur comprenant un tel fusible

Also Published As

Publication number Publication date
ES8609813A1 (es) 1986-07-16
DE8423056U1 (de) 1987-11-05
ES545821A0 (es) 1986-07-16
DE3428568A1 (de) 1986-02-13
EP0170171A3 (fr) 1987-09-16

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Inventor name: SCHULTZ, LUDWIG, DR.