EP0769795A2 - Fusible de haute puissance haute tension pour une ligne de connexion électrique - Google Patents

Fusible de haute puissance haute tension pour une ligne de connexion électrique Download PDF

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Publication number
EP0769795A2
EP0769795A2 EP96113896A EP96113896A EP0769795A2 EP 0769795 A2 EP0769795 A2 EP 0769795A2 EP 96113896 A EP96113896 A EP 96113896A EP 96113896 A EP96113896 A EP 96113896A EP 0769795 A2 EP0769795 A2 EP 0769795A2
Authority
EP
European Patent Office
Prior art keywords
field
fuse
tube
insulating
insulating tube
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Withdrawn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
EP96113896A
Other languages
German (de)
English (en)
Other versions
EP0769795A3 (fr
Inventor
Werner Dipl.-Ing. Dreischke
Herbert Dipl.-Ing. Bessei
Michael Drothen
Jürgen Dipl.-Ing. Gärtner
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.)
EFEN GmbH
Original Assignee
EFEN Elektrotechnische Fabrik GmbH
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 EFEN Elektrotechnische Fabrik GmbH filed Critical EFEN Elektrotechnische Fabrik GmbH
Publication of EP0769795A2 publication Critical patent/EP0769795A2/fr
Publication of EP0769795A3 publication Critical patent/EP0769795A3/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Withdrawn legal-status Critical Current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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/042—General constructions or structure of high voltage fuses, i.e. above 1000 V
    • 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
    • H01H2085/0225—Means for preventing discharge, e.g. corona ring
    • 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
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H01H85/2045—Mounting means or insulating parts of the base, e.g. covers, casings

Definitions

  • the invention relates to a high-voltage, high-performance (HH) fuse for an electrical connecting line, in particular a cable line between a transformer and a switchgear, with a fuse insert accommodated in an insulating sheath and with a connecting element and with a conductive cover that surrounds the insulating sheath on the outside, and with a layer within the insulating sheath to discharge partial discharges.
  • HH high-voltage, high-performance
  • HV fuses In local network stations of the energy supply companies, the transformer outlets are protected with HV fuses, which are mostly housed within the enclosure of the switchgear. This technique is complex because the security area is different from the rest Isolation room of the switchgear must be sealed gas-tight. In addition, the accessibility of the HV fuses is very limited and thermal problems are to be expected due to the encapsulation. Overheated HV HRC fuse can destroy the entire switchgear.
  • Switchgear versions are currently available on the market in which the HV fuses are housed in insulating tubes outside the remaining insulating gas space of the switchgear and connected to it by means of plugs.
  • This version requires an additional, locked metal housing as contact protection, which may only be removed when the transformer switch is switched off.
  • partial discharges can go out on the very thin fuse links due to the small spacing between adjacent outer conductors, which far exceed the permissible value for the system and do not allow a statement on the insulation behavior of the system based on partial discharge measurements or distort. It is also to be expected that permanent discharges on the fusible conductors due to material removal and chemical reactions will lead to permanent changes in the characteristics and function.
  • HH fuse high-voltage high-performance (HH) fuse of the type mentioned is known, but in which two groups of fusible conductors are accommodated in two separate chamber housings and each chamber housing carries a high-resistance layer on the inside.
  • This HV fuse is complex because of the two separate chambers. It also has the disadvantage that the switching behavior of the fuse can be influenced by the high-resistance layer, which is not further defined. Since the high-resistance layer lies directly in the switching space of the arc, extensive measures are necessary to rule out a negative influence on the otherwise known switching behavior of arcs in uncoated insulating tubes.
  • the object of the invention is therefore to design the HV fuse of the type mentioned in such a way that the switching behavior is improved, a particularly compact encapsulation of the HV fuse is possible, the radial dimensions of which do not exceed the standard cable sets of the same nominal voltage, and that partial discharges from the fusible conductor in particular can be limited to a permissible size by special control measures of the electrical field.
  • the insulating sheath is a one-piece, cylindrical insulating tube and at least one of the connection elements via one Connector connected to a cable with field control body.
  • the known fuses also have insulating casings, which, however, disadvantageously consist of divided housings, with each disconnection point indicating an electrical weak point. If you allow radial air gaps, for example, you accept a much lower insulation resistance. This could only be remedied by increasing the total thickness of the insulation.
  • a one-piece insulating tube has been chosen, i.e. a one-piece, unbroken insulating tube. This avoids every electrical joint, every weak point and can still keep the thickness of the insulating materials smaller.
  • the HV HRC fuse can be configured in a manner that complies with the cable, i.e. one achieves a compact design in such a way that the connection dimensions available for commercially available cable fittings - especially in the radial direction - are not exceeded. This also does not affect the electrical properties of the transformer loop.
  • a field control body is connected to a connection element, internal partial discharges can also be suppressed. This is achieved according to the invention to such a degree that the product is considered to be "partially discharge-free” if the partial discharges are undershot.
  • the yardstick for this can be, for example, the applicable standard for cable fittings with the same nominal voltage.
  • the design of the encapsulated HV fuse of the invention preferably corresponds to that of a cable sleeve or that of a pluggable or screwable cable connection according to DIN VDE 0278 part 6.
  • the insulating tube covers at least one connector and at least partially covers at least one field control body.
  • field control bodies are commercially available, accommodating such a field control body in the insulating tube, which at least partially covers it, permits a particularly compact encapsulation with a design that conforms to the cable technology. This is favorable for space-saving accommodation on switchgear or the like.
  • a field-controlling layer of semiconducting material is arranged on at least a portion of the length of the insulating tube and / or the fuse link with its external fuse tube.
  • the field-controlling devices located inside the insulating tube have, for example, components made of electrically semiconducting Materials. Such devices are used in particular in connection with the cable fitting technology to shut off terminations and to shield connectors.
  • the field-controlling layer of semiconducting material provides sufficient field shielding for the intact fuse element and also provides sufficient insulation between the contact caps located at the ends of the fuse insert during and after the fuse has been switched off.
  • At least one connector is shielded from a conductive electrode.
  • the conductivity of an electrode considered here is in the range between 1 and 1000 ⁇ cm. This relatively high conductivity serves for the partial discharge-free electrical shielding of the connection point.
  • an additional field-controlling layer could only be arranged in the area of the fuse link, thus simplifying the overall structure of the HV fuse.
  • These conductive electrodes can advantageously be installed in the insulating body, e.g. by pouring, gluing or the like. A similar gap-free and seamless shielding can also be achieved with a conductive lacquer coating or equivalent measures.
  • the field-controlling layer made of semiconducting material covers the entire safety tube and at least one connector.
  • the insulating tube can be manufactured more easily if the field-controlling layer is designed, for example, as a continuous tube.
  • the field-controlling layer made of semiconducting material can also be attached to the safety tube; while in another other embodiment this layer can also be applied in the form of a glaze and / or in connection with a glaze on the porcelain safety tube. Then the porcelain manufacturer can already provide the safety tube with the glaze and deliver it, so that the remaining assembly at the manufacturer of the HV fuse is considerably simplified.
  • the field-controlling layer made of semiconducting material is applied as a hose over the safety tube and / or field control body.
  • the semiconductor layer it is expedient to design the semiconductor layer as a heat shrink tube or alternatively as an elastomer tube.
  • Such hoses can not only be manufactured practically, but can also be handled, assembled and inserted in the securing structure at low cost.
  • Field control devices consist of a mixture of electrically insulating and conductive components.
  • the insulating components form the mechanical framework (binder) for the conductive components.
  • Conductive components can e.g. Carbon black, SiC and metal particles. They are incorporated in paints, casting resins or elastomers, whereby the electrical conductivity of the batch can be varied within wide limits via their concentration.
  • Conductive varnishes are particularly suitable for application to existing construction elements (e.g. on the safety tube).
  • Semiconductor tubes with the required properties are, in addition to the heat shrink tubes mentioned, also mechanically pre-stressed elastomer tubes (cold shrink tubes).
  • the field-controlling layer provides adequate shielding of the fuse element during operation and ensures sufficient insulation across the switching path after the fuse has been switched off.
  • the field-controlling layer is applied in the form of the heat shrink tubing, then in a preferred embodiment it expediently protrudes beyond the insulating tube and preferably also beyond the open end (s) of the insulating tube as far as the field control body or bodies.
  • the hose can be connected to an earth conductor.
  • the tube can be shrunk on as a pre-tensioned elastomer tube, for example in the form of a cold-shrink tube made of silicone rubber.
  • This hose can also protrude beyond the open end of the insulating tube (or beyond its two ends) to the field control body or bodies and there it can preferably be connected to an earth conductor.
  • the field control hoses if they extend in particular over the entire length of the fuse link, the connection points and, if present, the field control body, additional field control electrodes are not necessary over the connectors.
  • the insulating tube is open on at least one side for receiving a cable end with field control body and is provided on the other, non-open side with a plug connection for standardized device bushings.
  • the invention therefore enables the plug part of the invention to be used uniformly for all connected cable cross sections and cable types, because the field control body ensures the corresponding adaptation, as mentioned above.
  • the insulating tube can alternatively be made open on both sides, so that the fuse acts as a locking sleeve.
  • device connections could also be provided on both sides of the insulating tube, so that the function of a safety bridge results.
  • the insulating tube in the region of the connector to the cable is additionally provided with a plug connection for standardized device bushings.
  • the T-type design allows additional grounding of the cable. In other words, this embodiment allows a ground circuit.
  • the fuses of all embodiments have a one-piece, cylindrical insulating tube 2 as an insulating sheath under a metallic sheath 1 as the conductive cover.
  • a fuse insert Arranged in the insulating tube 2 is a fuse insert, generally designated 3, which carries contact caps 4 and 4 'at both ends with connecting bolts 5, 5'.
  • the fuse link 3 Radially from the outside inwards, the fuse link 3 has a fuse tube 6, quartz sand 7 as an extinguishing agent and a winding body 8 made of z. B. ceramic on which fuse element 9 are held taut.
  • the lower connecting pin 5 which, like the upper 5 ', can be welded, screwed or attached in a similar manner, is connected via a connector 10 to the bare conductor 11 of a cable 23 with field control body 12, for example by pinching or screwing.
  • the upper connecting bolt 5 ' is arranged almost in mirror image with respect to the securing insert 3 arranged in the middle, namely connected to a field control body 12' via a connector 10 '.
  • FIGS. 1-3 are constructed as angled plugs, the upper connecting bolts 5 'of which are provided with a bore (with or without thread) 13.
  • a plug pin 14 can be inserted through this bore 13 and screwed tight.
  • plug socket 15 with outer cone 16 and sealing plug 16 ', the connection to the bushing designated as a whole 17 is created.
  • This angled plug connection of FIGS. 1-3 can be screwed or plugged via the bushing 17 onto a transformer or switchgear (not shown).
  • a transformer or switchgear not shown.
  • One such embodiment is a fuse in the form of a cable connector.
  • the insulating tube 2 covers the fuse link 3, covering all embodiments. including its contact caps 4, 4 'and connecting bolts 5, 5' and also covers most of the field body 12 or 12 '.
  • the essentially cylindrical part of the insulating tube 2 is adjoined at the top by a T-piece 22, which is also insulating and covers the outer cone 16 and sealing plug 16 '.
  • a field-controlling layer 18 made of semiconducting material is arranged within the insulating tube 2. In the embodiment of FIGS. 1 and 5, this field-controlling layer 18 extends over the entire longitudinal direction of the insulating tube 2, ie from the field control body 12 shown below to the upper contact cap 4 '.
  • FIG. 1 this field-controlling layer 18 extends over the entire longitudinal direction of the insulating tube 2, ie from the field control body 12 shown below to the upper contact cap 4 '.
  • this semiconducting, field-controlling layer 18 is shorter in the lower region, ie it ends on the field control body 12, but is about 2 cm away from the lower connector 10.
  • the situation is similar in the embodiment according to FIG. 6, although the field-controlling layer 18 (dashed line) is shorter there both above and below in the sense of FIG. 2. Therefore, in the remaining area of FIGS. 2 and 6, a layer-free annular space 19 can be seen, namely in FIG. 2 below and in FIG. 6 both below and above.
  • the field-controlling layer 18 only extends over the fuse link 3. It ends overlapping at electrodes 21, 21 '.
  • the lower electrode 21 has a tubular shape, while a short tubular part of the upper electrode 21 '(in the case of the angled connector) is followed by a conical part which ultimately has a similar T-shape in the angled piece or T-piece 22.
  • the upper electrode 21 'in the case of the angled plug according to FIGS. 1 to 3 therefore deviates from the simple tubular shape of the lower electrode 21 in order to overlap the upper connecting bolt 5', the plug socket 15 and the outer cone 16 with sealing plugs 16 '.
  • the layer-free annular space 19 can be seen in the lower area of the field control body 12, which is also located at the top in the sleeve embodiment according to FIG. 7, where it is called 19 '.
  • the field-controlling layer 18 is located radially inside the insulating tube 2 and outside the fuse tube 6 of the fuse link 3.
  • the electrodes or field control electrodes With regard to the electrodes or field control electrodes, one can see in all of the embodiments their simple tubular shape in the area around the field control body 12 or partially overlapping them, unless the field-controlling layer 18 is attached there, as in FIGS. 1, 2, 5 and 6, where the No need for an electrode.
  • the simple tubular electrode 21 is therefore located in the lower region near the field control body 12 in the embodiments of FIGS. 3 and 7; 7 also at the top, because the sleeve embodiment is constructed symmetrically and also has a field control body 12 'at the top.
  • the electrode 21 'described above with the somewhat more complicated shape is located in the upper region of the bushing 17.
  • the field control devices are insulating in the longitudinal direction and conduct (in the manner of a Faraday cage) in the radial direction, so that the partial discharge is deactivated.
  • the field-controlling layer 18 is preferably made from semiconducting material, e.g. B. as a layer on the fuse tube 6 of the fuse link 3.
  • the manufacturer of the porcelain fuse tubes 6 could alternatively apply a glaze which has field-controlling properties.
  • the field-controlling layer can also be covered as a hose over the securing tube 6, be it as a heat-shrinkable hose or as an elastomer hose.
  • a field-controlling layer can also be applied to the inner surface of the insulating tube 2 by dipping or spraying, which would then also be provided in the assembly described here in the space between the insulating tube 2 and the parts arranged inside, such as the fuse link 3, connector 10 and field control body 12.
  • the side of the insulating tube 2 shown above is also open, where the end of a cable 23 'is also received via the field control body 12'.
  • the upper end of the insulating tube 2 is not open but is provided with a bushing 17 as a plug connection for standardized device bushings.
  • insulating tube 2 in the area of the connector 10 is additionally provided radially outward with a plug connection for standardized device bushings. There you could ground the cable 23. The fuse could then also be used as a safety bridge.
  • the invention can also be expressed in such a way that a field-controlling layer 18 is arranged in the insulating tube 2 at least around the fuse link 3.
  • the field-controlling layer 18 would then be in the Embodiment of Figure 1 applied according to the dashed line, ie starting from the cap 4 'down to around the field control body 12.
  • the insulating tube 2 with the upper electrode 21 'could be put on.
  • the field-controlling layer 18 is in turn only applied to the fuse tube 6 of the fuse link 3, for example in the form of a prefabricated fuse link, after which the electrode 21 shown in FIG. 3 is to be applied, which overlaps the area of the connector 10 .
  • the electrode could also be regarded as an integral part of the field-controlling layer 18, so that the starting form according to FIGS. 3 and 7 would represent a first solution principle, according to which the field-controlling layer in any case extends over the fuse link 3; with the second embodiment according to FIGS. 2 and 6, in which the field-controlling layer also passes over the connectors 10 and 10 and 10 'from the area above the fuse link 3; as a third embodiment corresponding to FIGS. 1 and 5, in which the field-controlling layer 18 is drawn out from the upper cap 4 'to beyond the field control body 12 or in FIG. 5 is drawn from the lower field-controlling body 12 to the upper body 12' ; and a further fourth embodiment corresponding to FIGS. 3 and 7, where the field-controlling layer in the region of the connector or connectors 10, 10 'is designed as an electrode 21.

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  • Fuses (AREA)
EP96113896A 1995-10-20 1996-08-30 Fusible de haute puissance haute tension pour une ligne de connexion électrique Withdrawn EP0769795A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995139060 DE19539060A1 (de) 1995-10-20 1995-10-20 Hochspannungs-Hochleistungs-Sicherung für eine elektrische Verbindungsleitung
DE19539060 1995-10-20

Publications (2)

Publication Number Publication Date
EP0769795A2 true EP0769795A2 (fr) 1997-04-23
EP0769795A3 EP0769795A3 (fr) 1997-12-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96113896A Withdrawn EP0769795A3 (fr) 1995-10-20 1996-08-30 Fusible de haute puissance haute tension pour une ligne de connexion électrique

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EP (1) EP0769795A3 (fr)
DE (1) DE19539060A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0833358A2 (fr) * 1996-09-28 1998-04-01 Efen Elektrotechnische Fabrik GmbH Fusible sous huile
EP0940834A2 (fr) * 1998-03-04 1999-09-08 Efen Elektrotechnische Fabrik GmbH Fusible à plusieurs gammes avec écran métallique
EP0978861A1 (fr) * 1998-08-07 2000-02-09 Thomas & Betts International, Inc. Fusible encapsulé
WO2012013831A1 (fr) * 2010-07-28 2012-02-02 Prefabricados Uniblok, S.L.U. Dispositif de connexion pour modules d'alimentation de transformateurs
CN103489728A (zh) * 2013-10-23 2014-01-01 烟台东方威思顿电气有限公司 一种高压熔断器
CN110957196A (zh) * 2019-12-26 2020-04-03 辽宁华隆电力科技股份有限公司 一种压力驱动式开闭线夹

Citations (9)

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Publication number Priority date Publication date Assignee Title
DD21962A (fr) *
US3513425A (en) * 1969-05-21 1970-05-19 Gen Electric Modular electrical conductor termination system
US3550056A (en) * 1969-01-31 1970-12-22 Mc Graw Edison Co Enclosed fuse
US3686604A (en) * 1969-08-12 1972-08-22 Rte Corp Current interrupting safe break terminator
FR2200608A1 (fr) * 1972-09-25 1974-04-19 Amerace Corp
US3835439A (en) * 1967-08-15 1974-09-10 Joslyn Mfg & Supply Co Grounded surface distribution apparatus
US3955167A (en) * 1975-01-08 1976-05-04 Mcgraw-Edison Company Encapsulated vacuum fuse assembly
US4060785A (en) * 1976-09-13 1977-11-29 Kearney-National Inc. Enclosing structure for a high voltage electric fuse
DE4006866C1 (en) * 1990-03-05 1991-06-06 Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co Kg, 7000 Stuttgart, De Housed medium or high voltage fuse - has sensor in cartridge recognising state of wound fuse wire

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DE311201C (fr) *
DE267894C (fr) *
CH135333A (fr) * 1928-11-23 1929-09-15 Zurich Pierre De Appareil électrique comprenant un conducteur de petite section placé sous haute tension.
DE657422C (de) * 1933-05-09 1938-10-24 Const Electr De Delle Sa Atel Hochspannungssicherung grosser Unterbrechungsstromstaerke
US2593426A (en) * 1948-11-12 1952-04-22 Westinghouse Electric Corp High-voltage power fuse and the like
DE2849699A1 (de) * 1978-04-07 1980-05-29 Driescher Spezialfab Fritz Kapselung fuer eine hochspannungs- hochleistungssicherung
DE3234024A1 (de) * 1982-09-14 1984-03-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Hochspannungsfeste schmelzsicherungsanordnung
DE4014392C2 (de) * 1989-09-13 1996-12-19 Wickmann Werke Gmbh Hochspannungshochleistungssicherung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD21962A (fr) *
US3835439A (en) * 1967-08-15 1974-09-10 Joslyn Mfg & Supply Co Grounded surface distribution apparatus
US3550056A (en) * 1969-01-31 1970-12-22 Mc Graw Edison Co Enclosed fuse
US3513425A (en) * 1969-05-21 1970-05-19 Gen Electric Modular electrical conductor termination system
US3686604A (en) * 1969-08-12 1972-08-22 Rte Corp Current interrupting safe break terminator
FR2200608A1 (fr) * 1972-09-25 1974-04-19 Amerace Corp
US3955167A (en) * 1975-01-08 1976-05-04 Mcgraw-Edison Company Encapsulated vacuum fuse assembly
US4060785A (en) * 1976-09-13 1977-11-29 Kearney-National Inc. Enclosing structure for a high voltage electric fuse
DE4006866C1 (en) * 1990-03-05 1991-06-06 Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co Kg, 7000 Stuttgart, De Housed medium or high voltage fuse - has sensor in cartridge recognising state of wound fuse wire

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0833358A2 (fr) * 1996-09-28 1998-04-01 Efen Elektrotechnische Fabrik GmbH Fusible sous huile
EP0833358A3 (fr) * 1996-09-28 1998-10-28 Efen Elektrotechnische Fabrik GmbH Fusible sous huile
EP0940834A2 (fr) * 1998-03-04 1999-09-08 Efen Elektrotechnische Fabrik GmbH Fusible à plusieurs gammes avec écran métallique
EP0940834A3 (fr) * 1998-03-04 1999-11-17 Efen Elektrotechnische Fabrik GmbH Fusible à plusieurs gammes avec écran métallique
EP0978861A1 (fr) * 1998-08-07 2000-02-09 Thomas & Betts International, Inc. Fusible encapsulé
AU744975B2 (en) * 1998-08-07 2002-03-07 Thomas & Betts International, Inc. Encapsulated fuse with corona shield
WO2012013831A1 (fr) * 2010-07-28 2012-02-02 Prefabricados Uniblok, S.L.U. Dispositif de connexion pour modules d'alimentation de transformateurs
CN103238192A (zh) * 2010-07-28 2013-08-07 欧玛嘉宝公司 模块化变电站
CN103238192B (zh) * 2010-07-28 2016-01-20 欧玛嘉宝公司 模块化变电站
US9246325B2 (en) 2010-07-28 2016-01-26 Ormazabal Y Cia, S.L.U. Connection device for transformer substation modules
CN103489728A (zh) * 2013-10-23 2014-01-01 烟台东方威思顿电气有限公司 一种高压熔断器
CN110957196A (zh) * 2019-12-26 2020-04-03 辽宁华隆电力科技股份有限公司 一种压力驱动式开闭线夹

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Publication number Publication date
EP0769795A3 (fr) 1997-12-10
DE19539060A1 (de) 1997-04-24

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