EP0833358A2 - Fusible sous huile - Google Patents

Fusible sous huile Download PDF

Info

Publication number
EP0833358A2
EP0833358A2 EP97115378A EP97115378A EP0833358A2 EP 0833358 A2 EP0833358 A2 EP 0833358A2 EP 97115378 A EP97115378 A EP 97115378A EP 97115378 A EP97115378 A EP 97115378A EP 0833358 A2 EP0833358 A2 EP 0833358A2
Authority
EP
European Patent Office
Prior art keywords
field
controlling layer
fuse
fuse link
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Withdrawn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
EP97115378A
Other languages
German (de)
English (en)
Other versions
EP0833358A3 (fr
Inventor
Werner Dreischke
Jürgen Gärtner
Herbert Dr. Bessei
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 EP0833358A2 publication Critical patent/EP0833358A2/fr
Publication of EP0833358A3 publication Critical patent/EP0833358A3/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Withdrawn legal-status Critical Current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
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings
    • H01H85/17—Casings characterised by the casing material
    • 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

Definitions

  • the invention relates to a high-voltage high-performance fuse link for use in Transformers under oil, with at least one fuse element held on a winding body, surrounded by quartz sand housed in a safety tube, and with Contact caps with connections on the longitudinal ends of the safety tube.
  • fuse links for transformers under oil are necessary to these transformers to safeguard operationally.
  • the known fuse links used for this must of course be oil-tight. You can achieve this with rubber seals or by soldering.
  • end caps are used in the fuse link according to the invention soldered to a porcelain tube, which ensures perfect oil tightness over the entire operation is achieved.
  • Fuse insert provided in an insulating sheath and in this a layer for Derivation of partial discharges arranged.
  • the use in transformers under oil often fails due to the influences of the partially warm oil on the surfaces of such a fuse link.
  • the invention is therefore based on the object, a HH fuse link with simple and to create a compact structure that is also suitable for protecting transformers under oil and is partially discharged.
  • the electrical conductivity of the field-controlling layer is sufficiently large, in particular so high, that partial discharges from the fuse element can be suppressed.
  • the inside of the The fuse and edge-effective fuse element is electrical shielded from the outside.
  • the field-controlling layer is sufficiently high-impedance, so that a bridging by the field-controlling layer is not given.
  • the leakage current should be between a maximum of 1 mA and less than 5 mA.
  • the field-controlling layer consists of a carrier material and a filler of predetermined electrical conductivity in the form of field control parts consists.
  • the manufacture of a porcelain safety tube is a common technique and promises a technically simple production.
  • the correspondingly cheap on their outer Field-controlling layer which can be applied is oil-resistant and consists of a carrier material and an electrically conductive filler or a filler with a defined electrical conductivity.
  • the electrical conductivity of the Filler is dependent on field strength. So the higher the field strength, the greater it is Conductivity of the layer. In this way there are cheap field smoothing. It is understood that such a field-controlling layer with the features mentioned above is oil-resistant, i.e. does not connect to it, so that the field-controlling layer also during operation increasing temperatures do not change in volume and thus its conductivity remains unchanged.
  • the field-controlling layer on the inner and / or the outer surface of the safety tube is applied.
  • the one made of porcelain The safety tube then only needs to be immersed in the liquid containing the coating in the form of the field-controlling layer. This immersion of the porcelain body is for the Manufacturer only a single operation, which he has to carry out anyway, so that none in production additional effort is necessary. Just mixing and making the coating for the surfaces of the porcelain tube are necessary. Without additional measures you can then ensure the coating of the safety tube on the outside and inside at the same time.
  • the field-controlling layer is applied in the form of an engobe, you get a thermally very stable layer, which is practically the same thermal Has resistance like the porcelain tube because it is a very similar basic mass.
  • Engobes often differ from the basic mass of a body by the finer one Part of the grain and possibly also a slightly higher proportion of plastic Components.
  • Sinter engobes are produced by adding fluxes, for example Calcium borate or low-melting fries, to matt-burning engobes.
  • the engobe liquid is filled with the aforementioned fillers, for example semiconducting substances, transferred.
  • the porcelain tube (safety tube) is then immersed in this liquid and fired together with this surface coating.
  • the melting point of a glaze may also differ from that of the engobe, so that the field-controlling Layer in the form of an engobe can be porous and has a coarser surface.
  • the field-controlling layer is in the form of a Coating, in particular a glaze, is applied to the safety tube (4).
  • the HH fuse link According to the invention, a cleaning tube surrounding the quartz sand has Porcelain because the application of a glaze to a tube made of porcelain because of the similar Properties of these two materials is easier. It has been tried here and there to create a field-controlling layer in the form of a glaze and on fuse links to apply, according to the invention, the expert has to observe the teaching that this Glaze is incompatible with oil, i.e. there are no reactions with oil, for example not in oil solves.
  • the field control parts are semiconductor parts, metal parts or carbon black and preferably nitrile rubber is used as the carrier material.
  • Nitrile rubber is a Oil-resistant carrier, which is field-controlled or conductive through the field control parts mentioned makes.
  • the fuse link of both embodiments has one centrally arranged Winding body 1 made of, for example, ceramic, fuse element 2 wound under tension.
  • This helically wound fuse element 2 is surrounded by quartz sand 3, which in the Figures here is only shown as a room. Outside a safety tube 4 made of porcelain surrounds the Quartz sand 3.
  • the outer surface 7 is made of Porcelain existing security tube 4 a field-controlling layer 8 in the form of an engobe or glaze applied.
  • this field controlling layer is shown as a dashed line and extends from the lower contact cap 5 to the upper 5 '.
  • the embodiment of the Figure 3 shows the field-controlling layer 8 by the outer ring.
  • the outer surface 7 is made of porcelain existing safety tube 4 leave uncoated, but the inner surface 9 (the is left uncovered in Figures 1 and 2) is here with a glaze or engobe provided as a field-controlling layer 8.
  • this is on the inner surface 9 of the Safety tube 4 located field-controlling layer 8 by a dash-dotted line shown, while this layer 8 is shown in Figure 4 by the inner ring.
  • both the outer surface 7 of the safety tube 4 as well as its inner surface 9 both with are provided with a field-controlling layer.

Landscapes

  • Fuses (AREA)
EP97115378A 1996-09-28 1997-09-05 Fusible sous huile Withdrawn EP0833358A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996140106 DE19640106A1 (de) 1996-09-28 1996-09-28 Unter-Öl-Sicherung
DE19640106 1996-09-28

Publications (2)

Publication Number Publication Date
EP0833358A2 true EP0833358A2 (fr) 1998-04-01
EP0833358A3 EP0833358A3 (fr) 1998-10-28

Family

ID=7807298

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97115378A Withdrawn EP0833358A3 (fr) 1996-09-28 1997-09-05 Fusible sous huile

Country Status (2)

Country Link
EP (1) EP0833358A3 (fr)
DE (1) DE19640106A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19827390A1 (de) * 1998-06-19 1999-12-23 Sicherungen Bau Gmbh Hochspannungssicherung
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
CN107068510A (zh) * 2016-12-30 2017-08-18 南京萨特科技发展有限公司 一种紧凑型防爆保护器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3244838A (en) * 1963-09-12 1966-04-05 Westinghouse Electric Corp Current limiting fuse device and corona free protective link for use therein
US3962667A (en) * 1972-07-26 1976-06-08 Rte Corporation Combination fuse and bushing
WO1984000078A1 (fr) * 1982-06-14 1984-01-05 Raychem Corp Composants electriques blindes
EP0769795A2 (fr) * 1995-10-20 1997-04-23 Efen Elektrotechnische Fabrik GmbH Fusible de haute puissance haute tension pour une ligne de connexion électrique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3244838A (en) * 1963-09-12 1966-04-05 Westinghouse Electric Corp Current limiting fuse device and corona free protective link for use therein
US3962667A (en) * 1972-07-26 1976-06-08 Rte Corporation Combination fuse and bushing
WO1984000078A1 (fr) * 1982-06-14 1984-01-05 Raychem Corp Composants electriques blindes
EP0769795A2 (fr) * 1995-10-20 1997-04-23 Efen Elektrotechnische Fabrik GmbH Fusible de haute puissance haute tension pour une ligne de connexion électrique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19827390A1 (de) * 1998-06-19 1999-12-23 Sicherungen Bau Gmbh Hochspannungssicherung
DE19827390B4 (de) * 1998-06-19 2004-10-28 Sicherungen-Bau Gmbh Hochspannungssicherung
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
CN107068510A (zh) * 2016-12-30 2017-08-18 南京萨特科技发展有限公司 一种紧凑型防爆保护器

Also Published As

Publication number Publication date
DE19640106A1 (de) 1998-04-02
EP0833358A3 (fr) 1998-10-28

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