EP0886287B1 - Manchon isolant - Google Patents

Manchon isolant Download PDF

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Publication number
EP0886287B1
EP0886287B1 EP19980660046 EP98660046A EP0886287B1 EP 0886287 B1 EP0886287 B1 EP 0886287B1 EP 19980660046 EP19980660046 EP 19980660046 EP 98660046 A EP98660046 A EP 98660046A EP 0886287 B1 EP0886287 B1 EP 0886287B1
Authority
EP
European Patent Office
Prior art keywords
fuse
insulator
frame
cast resin
transformer
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.)
Expired - Lifetime
Application number
EP19980660046
Other languages
German (de)
English (en)
Other versions
EP0886287A3 (fr
EP0886287A2 (fr
Inventor
Vesa Virtanen
Tapani Tiitola
Jorma Jokinen
Esa Virtanen
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.)
ABB Technology AG
Original Assignee
ABB Technology AG
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 ABB Technology AG filed Critical ABB Technology AG
Publication of EP0886287A2 publication Critical patent/EP0886287A2/fr
Publication of EP0886287A3 publication Critical patent/EP0886287A3/fr
Application granted granted Critical
Publication of EP0886287B1 publication Critical patent/EP0886287B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/005—Insulators structurally associated with built-in electrical equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • 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 present invention relates to a bushing insulator or voltage transformer, comprising an end-to-end primary current conductor and a longitudinal frame cast of cast resin around the primary current conductor.
  • Bushing insulators are used e.g. in distribution transformers to connect a winding arranged within the transformer housing through the transformer housing to an external electric power system.
  • Fuse protection is typically used in distribution transformers against damage to the transformer coils. Fuse protection prevents transformer malfunction from causing long voltage breaks in the distribution network or the bus-bar system of a switch gear, since the network can be kept live during the time required for finding the fault and preparing to replace the transformer.
  • a high voltage fuse can be placed within the transformer housing.
  • the problem in this solution is the space required by the fuse, on account of which the dimensions of the transformer housing have to be changed in view of standard solutions.
  • a known solution to avoid the above problem related to increasing the size of the transformer housing is to use a porcelain bushing insulator and arrange an exchangeable fuse therein.
  • a porcelain bushing insulator In filling a transformer, an insulating liquid, which accordingly fills the transformer, also fills the free space left around the high voltage fuse within the bushing insulator.
  • the insulator In order to lead the insulating liquid to said free space, the insulator has to comprise an arrangement for air removal, since the air remaining within the insulator will cause partial discharge to occur within the bushing insulator.
  • the risk involved in this kind of porcelain bushing insulators, filled with insulating material and having an exchangeable fuse arranged therein, is that when they are broken, the liquid used as the insulating material leaks out causing environmental problems and fire risks, for example.
  • the above problems can be solved by the bushing insulator or a voltage transformer as claimed in claim 1 and claim 3.
  • the primary current conductor comprises a fuse which is not exchangeable and at least partly left within the cast resin when casting the frame, and that the part of the fuse remaining within the cast resin upon casting the frame is either encapsulated in a layer of rubber or other corresponding elastic material which in turn is encapsulated in a semiconducting layer, or encapsulated in a layer of semiconducting rubber or other corresponding semiconducting elastic material.
  • the preferred embodiment of the bushing insulator or the voltage transformer of the invention is further characterized in that the part of the fuse remaining within the cast resin upon casting the housing is encapsulated in a layer of semiconducting rubber or other corresponding semiconducting elastic material.
  • An alternative structure solution is to encapsulate the part of the fuse remaining within the cast resin upon casting the housing in a layer of rubber or other corresponding elastic material, which is encapsulated in a semiconducting layer.
  • the rubber or other corresponding material is able to receive the tensions caused by the shrinkage of the cast resin, and consequently prevent the fuse itself from being broken because of said tensions.
  • the semiconductivity of the material or the semiconducting layer serves, in turn, to keep the electric field in the insulation gap, i.e. within the cast resin, and thus prevent partial discharge from occurring either in the air possibly remaining within the closed-cell rubber cells or in the space possibly remaining between the fuse and the layer made of rubber or other corresponding elastic material.
  • the figure in the attached drawing shows an exemplary embodiment of the bushing insulator of the invention in partial cross-section.
  • the insulator shown in the figure comprises a primary current conductor 1, extending throughout the insulator.
  • An insulator frame 2 is cast of cast resin 3 around the primary current conductor 1. Since the exemplary embodiment shown in the figure is intended for outdoor use, the frame 2 is provided in a conventional manner with flanging which serves to prevent leakage currents along the insulator surface from the primary current conductor 1 to the supporting structure (not shown) of the insulator, such as a transformer housing.
  • the insulator shown in the figure is intended to rest on the supporting structure from below a sturdy flange 7 at the vicinity of its one end.
  • part of the primary current conductor 1 is composed of a fuse 4, for the most part cast within the cast resin 3.
  • the fuse is connected to the rest of the primary current conductor by tinning at a metal cap at its upper end.
  • Part of the fuse 4 projects outwardly from the lower end of the insulator frame 2.
  • the fuse typically having a ceramic frame, the fuse has been encapsulated in a layer 6 of rubber or other corresponding material before casting in the cast resin 3. This rubber layer 6 serves to receive the compressive stress exerted on the fuse upon shrinkage of the cast resin.
  • an air layer may remain between the rubber layer 6 and the fuse 4 and could cause partial discharge to occur.
  • a semiconducting layer such as a paper 5
  • partial discharge can be avoided since the electric field between the primary current conductor 1 and the supporting structure of the insulator keeps acting between said semiconducting layer 5 and the supporting structure, i.e. expressly over the cast resin 3.
  • the semiconducting layer 5 when connecting in parallel with the fuse, partially short circuits the fuse, the short circuit is, however, so insignificant that the fuse still operates correctly, i.e. blows at fault currents caused e.g. by a fault in the coil of the distribution transformer.
  • the semiconducting layer 5 in parallel with the fuse, also causes the other end of the fuse to stay live, and a low leakage current still flows although the fuse is blown.
  • a fault current is so low that it has no significance as regards the actual protective function, and perfect fault separation is thus not required.
  • the high voltage bushing insulator shown in the figure comprises a field controller, in practice a metal cylinder, disposed within the cast resin 3, at the point where the bushing insulator is e.g. by the wall of the housing of the distribution transformer.
  • this field controller is denoted by reference 8.
  • the field controller 8 can be earthed by earth conductors which can be coupled to screw holes 9.
  • the fuse is not exchangeable.
  • the fuse is dimensioned such that it blows only in case of transformer malfunction, so that the higher cost caused by exchanging the entire bushing insulator as compared with exchanging only the fuse is not significant when proportioned to the total cost caused by exchanging the entire transformer.
  • the arrangement of the invention for casting the fuse within cast resin by using a layer of rubber or corresponding material and a semiconducting layer, or alternatively, a layer of semiconducting rubber or other corresponding semiconducting material, to receive the compressive forces around the fuse is also very well suitable for use in association with this component.
  • a voltage transformer fuse is typically so dimensioned that is blows only in transformer malfunction.
  • the fuse can be cast fixedly within the transformer frame by the arrangement of the invention. This is a way of avoiding the solution used in conventional voltage transformers, in which the fuse is provided with a separate chamber comprising a fuse holder for connecting the fuse as a part of the primary current conductor. It is now possible to leave out the relatively expensive fuse holder.
  • the joint which is susceptible to corrosion under unfavourable circumstances, but difficult to check, can also be left out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Fuses (AREA)
  • Transformers For Measuring Instruments (AREA)

Claims (3)

  1. Isolateur de traversée ou transformateur de tension, comprenant un conducteur de courant primaire de bout en bout (1) et un cadre d'isolateur (2) autour du conducteur de courant primaire, le conducteur de courant primaire (1) comprenant un fusible (4), caractérisé en ce que le cadre est moulé en une résine de coulée (3), le fusible (4) n'est pas remplaçable et au moins partiellement laissé dans la résine de coulée (3) lors du moulage du cadre (2), et la partie du fusible (4) restant dans la résine de coulée (3) lors du moulage du cadre est encapsulée dans une couche (6) de caoutchouc ou d'un autre matériau élastique correspondant qui, à son tour, est encapsulée dans une couche semi-conductrice (5).
  2. Isolateur de traversée ou transformateur de tension selon la revendication 1, caractérisé en ce que ledit caoutchouc ou autre matériau élastique correspondant est semi-conducteur.
  3. Isolateur de traversée ou transformateur de tension, comprenant un conducteur de courant primaire de bout en bout (1) et un cadre d'isolateur (2) autour du conducteur de courant primaire, le conducteur de courant primaire (1) comprenant un fusible (4), caractérisé en ce que le cadre est moulé en une résine de coulée (3), le fusible (4) n'est pas remplaçable et au moins partiellement laissé dans la résine de coulée (3) lors du moulage du cadre (2), et la partie du fusible (4) restant dans la résine de coulée (3) lors du moulage du cadre est encapsulée dans une couche de caoutchouc semi-conducteur ou d'un autre matériau élastique semi-conducteur correspondant.
EP19980660046 1997-05-19 1998-05-18 Manchon isolant Expired - Lifetime EP0886287B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI972131 1997-05-19
FI972131A FI116328B (fi) 1997-05-19 1997-05-19 Läpivientieristin tai jännitemuuntaja

Publications (3)

Publication Number Publication Date
EP0886287A2 EP0886287A2 (fr) 1998-12-23
EP0886287A3 EP0886287A3 (fr) 1999-09-22
EP0886287B1 true EP0886287B1 (fr) 2003-11-12

Family

ID=8548876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980660046 Expired - Lifetime EP0886287B1 (fr) 1997-05-19 1998-05-18 Manchon isolant

Country Status (3)

Country Link
EP (1) EP0886287B1 (fr)
DE (1) DE69819605T2 (fr)
FI (1) FI116328B (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666992A (en) * 1970-10-22 1972-05-30 Allis Chalmers Mfg Co Protective means for distribution transformer
US3678432A (en) * 1971-04-26 1972-07-18 Gen Electric Vented fuse module for underground power cable system

Also Published As

Publication number Publication date
FI116328B (fi) 2005-10-31
FI972131A0 (fi) 1997-05-19
FI972131A (fi) 1998-11-20
EP0886287A3 (fr) 1999-09-22
DE69819605D1 (de) 2003-12-18
EP0886287A2 (fr) 1998-12-23
DE69819605T2 (de) 2004-09-23

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