EP0494807B1 - Anschlussklemme für Hochspannung - Google Patents

Anschlussklemme für Hochspannung Download PDF

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Publication number
EP0494807B1
EP0494807B1 EP92400016A EP92400016A EP0494807B1 EP 0494807 B1 EP0494807 B1 EP 0494807B1 EP 92400016 A EP92400016 A EP 92400016A EP 92400016 A EP92400016 A EP 92400016A EP 0494807 B1 EP0494807 B1 EP 0494807B1
Authority
EP
European Patent Office
Prior art keywords
head
insulator
ring
voltage
high voltage
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
EP92400016A
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English (en)
French (fr)
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EP0494807A1 (de
Inventor
Jean Paul Avocat
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Individual
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Individual
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Publication of EP0494807A1 publication Critical patent/EP0494807A1/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/53—Bases or cases for heavy duty; Bases or cases for high voltage with means for preventing corona or arcing

Definitions

  • the invention relates to an apparatus as defined in the preamble of claim 1 and comprising a high voltage terminal more particularly suitable for current transformers for outdoor use in molded resin. It is mainly of interest to manufacturers of electrical equipment.
  • the high voltage connection terminal is a device intended to ensure the connection with an external high voltage line.
  • these include windings wound around magnetic cores placed in a closed insulating mass molded around said core. These windings are connected, one to an external high voltage line, the other to a secondary low voltage network.
  • high voltage connection terminals pose some construction difficulties. In fact, they generally consist of two parts which are the head connected to the high voltage line and the base at ground potential. These two parts are separated by a tubular insulator which encloses a conduit in which are placed the electrical conductors which join the lower part of the device to the ground potential receiving the secondary output terminals and an upper part carrying the connection parts to the high voltage line. Consequently, between the head and the base there is a very significant potential difference and given their proximity, this creates intense electric fields which favor the formation of electric arcs and ionizing discharges.
  • the insulator used is of the fin type, that is to say a series of peripheral discs are arranged outside the insulator, the sides of the discs being inclined downward to prevent it from being able to have stagnant moisture on the underside of the fins.
  • Many insulator profiles are known to those skilled in the art to lengthen the path from the high voltage part to the grounded part and create vanishing lines opposing the creation of electric arcs to prevent the path of sparks and the arcing of electric arcs along the insulator.
  • the active parts of the electrical apparatus constituted in the case of transformers of magnetic circuits, of low and high voltage windings, are coated by molding with solid synthetic resin, the assembly forming the body of the electrical apparatus. .
  • this device is divided into two parts, one formed by all of the parts in contact with the high voltage, the other part being made up of all the parts in contact with the ground at ground potential. .
  • the naturally insulating surface of the body of the electrical appliance will be subjected to the electric field prevailing between the high voltage part and the low voltage part connected to earth. It will therefore be the seat, like the insulator, of rampant electric shocks which, in the long run, can degrade the device and cause its destruction.
  • This serious problem which is likely to destroy the electrical appliance could be solved by covering the body of the electrical appliance with a conductive metallic deposit. It is generally a relatively thick and solid layer of hot sprayed metal such as zinc, in order to form a conductive layer which equalizes the potential of the covered surface.
  • the conductive layer is connected either to the earth potential or to the high-voltage terminal according to the chosen arrangement. In this way, the surface potentials are fixed and the influences of the external electric fields are dominated. The risks of creeping electrical sparks are completely eliminated.
  • the conductive layer must be able to flow the electric current due to a possible arc along the insulator.
  • the conductive layer thin despite everything, ends in a sharp edge facing the insulator which will generate sparks in service and arcs in the event of overvoltage on the network, while the leakage currents along the insulator, which will arise on this edge, will gradually degrade it by eating away at the metallic layer.
  • the main object of the present invention is to present an improved apparatus in terms of insulation.
  • improvements have been made at two levels.
  • the surface of the head of the device will no longer be the seat of the formation of creeping sparks and therefore, its longevity is ensured.
  • the distribution of the electric field between the parts under voltage and ground inside the insulator is fully controlled to avoid any internal ionizing electrical discharge.
  • the high voltage connection terminal for electrical devices such as a current or voltage transformer, comprising at least two parts, one of which, the head, is connected to a high voltage line and the other, the base, with earth , both separated by a tubular insulator which encloses a conduit where the conductors connecting the high-voltage connection piece to the internal circuit of the device are placed, is characterized by the fact that the head is covered with a metallic layer and that a metal ring is interposed between said head and the insulator.
  • the present invention relates to a high voltage connection terminal for electrical devices, such as dry current or voltage transformer. It mainly concerns manufacturers of electrical equipment.
  • the present invention has been developed more particularly in the context of the construction of medium voltage current transformers, it may extend to all medium and high voltage devices comprising members placed in an insulating casing or coated with insulating resin.
  • the high voltage connection terminals are electrical components intended to be connected to an external high-voltage line.
  • all of the electrical components that is to say magnetic core and high and low voltage winding, are embedded in a molded resin which is in the form of a head (1) in Figure 1.
  • the head (1) is crossed by a pin (2) connected directly to the external high voltage line.
  • the pin (2) is fixed on a hollow insulating support (3) which encloses the various electrical components. This constitutes the first part of the device which is brought to the high voltage potential.
  • the other part of the high-voltage terminal is formed by the fixing base (4) and which is brought to earth potential.
  • the low voltage output terminals of the device are fixed to the base (4).
  • the head (1) and the base (4) are separated by a tubular insulator (5) with fins which encloses a conduit (6) where the conductors, not shown, of electrical connection are placed.
  • a significant potential difference corresponding to the supply voltage of the high-voltage electrical device exists between the head (1) and the base (4).
  • the fin insulator (5) must have a sufficient creepage distance to prevent the passage of sparks due to the electric field prevailing between the head (1) and the base (4). When it rains or when more or less conductive atmospheric deposits form on the electrical device, good resistance to creeping sparks and electric arcs is required of the material constituting the insulator. These electrolytic conduction phenomena are very daunting and cannot be totally eliminated. Particular care must be taken in the choice of material used for the manufacture of the fin insulator (5) so that it cannot be destroyed by the action of either electric arcs or creeping sparks. For example, it is desirable to use porcelain, elastomer, synthetic resins or other materials of a different nature from that used to form the coating of the active parts of the device.
  • the manufacturers cover the body of the device with a relatively thick and solid metallic deposit.
  • the insulating surfaces are eliminated and the superficial electric fields disappear.
  • These conductive layers are connected either to the high voltage potential or to the ground potential, in order to precisely define the live parts and the grounded parts and thus precisely locate the electric fields.
  • the surface metal deposits consist of a projection of hot zinc onto the resin to form a conductive layer equalizing the potential of the covered surface.
  • the outer part of the head (1) is covered with a conductive layer (7).
  • This conductive layer (7) is connected to the potential of the pin (2) and therefore to the high voltage line.
  • the electric field in the outer part of the terminal is strictly limited to the part between the upper and lower ends of the fin insulator (5).
  • the thickness of the conductive layer (7) must be sufficient to withstand the flow of an electric leakage current originating between the pin (2) and the base (4).
  • the conductive layer (7) is perfectly able to meet the requirements and in the event of accidental arcing, the creeping spark travels the outer surface of the fin insulator (5) from the bottom of the layer (7), that is to say the crown for supporting the head (1) on the fin insulator (5), up to the base (4).
  • the surface layer (7) stops at the sharp edge (8) of the head support ring (1) on the insulator (5).
  • the sharp edge promotes the formation of sparks in service and the creation of arcs in the event of overvoltage on the network. Leakage currents along the insulator (5) will also arise at this edge (8) and will gradually degrade it by gnawing the metal layer (7) at this level.
  • a ring (9) is interposed between the head (1) and the insulator (5) as shown in Figure 1.
  • the sharp edge (8) of the support ring of the head (1) rests on the metal ring (9) and it will be precisely this metal ring (9) which will be the part closest to the base (4) and where the maximum electric field will be concentrated. If arcs are created, the spark will arise at the level of the ring (9) to go to the base (4) and the sharp edge (8) of the head (1) will be completely protected .
  • Figure 2 shows in detail the establishment of the ring (9) at the top of the insulator (5).
  • This metal ring (9) has a profile with rounded edges. This limits the creation of electric arcs which seek, to take birth, angular or pointed forms.
  • the outer diameter of the ring (9) is greater than that of the head support ring (1). This makes it possible to protect the sharp edge (8) of the metal layer (7) in the event of the creation of an electric arc whose trajectory must pass through the ring (9).
  • the ring (9) is connected to the pin (2) by a braid (10) or other conductive element as illustrated in FIG. 2.
  • one solution consists in interposing an insulating screen (11) between the conduit (6) and the ring (9).
  • the ring (9) can also be extended inside the insulator (5) by a cylindrical surface (12) as illustrated in FIG. 1 terminated by a flourishing (13).
  • the body of the device containing the various electrical components such as high voltage, low voltage and core winding, was enclosed in the body of the device, i.e. the head ( 1) molded resin placed at the top of the device.
  • the head (1) containing the various electrical members is located in the lower part of the device.
  • the high voltage connection pin (2) is replaced by studs (17 and 18) fixed on an insulating support (19) placed at the top of the insulator (5) and connected to the head (1) by electrical conductors introduced in the central connection conduit (6) .
  • the magnetic cores, primary and secondary windings, are embedded in a molded case (3) placed in the head (1) which is covered with a conductive layer (7) connected to earth.
  • a ring (9) is interposed between the insulator (5) and the head (1) at the base of said insulator, as illustrated in FIG. 3.
  • This ring (9) is set to earth potential and therefore forms a protective screen against the conductive film (7).

Landscapes

  • Cable Accessories (AREA)
  • Insulators (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Insulating Bodies (AREA)

Claims (9)

  1. Mittel- oder Hochspannungsgerät, umfassende einen Kopf (1), der die Spulenwicklungen und den Magnetkern enthält, die in einer isolierenden Stütze (3) untergebracht sind, wobei das genannte Gerät wenigstens zwei Teile umfaßt, wovon einer mit der Hochspannung und der andere mit der Masse verbunden ist, wobei beide durch einen röhrenförmigen Rippenisolator (5) voneinander getrennt sind, der einen Kanal (6) enthält, in dem die Leiter zum Verbinden des Kopfes (1) mit den äußeren Teilen des Gerätes untergebracht sind, dadurch gekennzeichnet, daß die isolierende Stütze (3) des Kopfes (1) am äußeren Teil mit einer leitenden Metallschicht überzogen ist und zwischen dem Kopf (1) und dem Isolator (5) ein Metallring (9) eingefügt ist.
  2. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß der Ring (9) ein Profil mit abgerundeten Kanten aufweist.
  3. Gerät nach Anspruch 2, dadurch gekennzeichnet, daß der Ring (9) einen Außendurchmesser aufweist, der größer ist als derjenige des Auflagekranzes des Kopfes (1) auf dem Isolator (5).
  4. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß der Ring (9) über ein Anschlußband oder einen anderen leitenden Teil mit dem Hochspannungsteil, insbesondere mit dem Verbindungsstift (2), verbunden ist.
  5. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß ein isolierender Schirm (11) zwischen dem Ring (9) und dem Kanal (6) eingefügt ist.
  6. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß der Ring (9) im Inneren des Isolators (5) durch eine zylindrische Fläche (12), die in einer Erweiterung (13) endet, verlängert wird.
  7. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß eine Dichtung in eine im Metallring (9) vorgesehene Nut angeordnet wird.
  8. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß ein isolierender Zylinder (14) im Inneren des Isolators (5) zwischen dem Kanal (6) und dem Ring (9) und dessen Verlängerung (12) eingefügt ist.
  9. Gerät nach Anspruch 8, dadurch gekennzeichnet, daß der isolierende Zylinder (14) im Bereich seiner Ineinanderfügung mit dem isolierenden Teil (16) des Sockels (4) Dichtungen (15) aufweist.
EP92400016A 1991-01-10 1992-01-03 Anschlussklemme für Hochspannung Expired - Lifetime EP0494807B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9100344 1991-01-10
FR9100344A FR2671670B1 (fr) 1991-01-10 1991-01-10 Borne haute tension de raccordement.

Publications (2)

Publication Number Publication Date
EP0494807A1 EP0494807A1 (de) 1992-07-15
EP0494807B1 true EP0494807B1 (de) 1996-03-27

Family

ID=9408654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92400016A Expired - Lifetime EP0494807B1 (de) 1991-01-10 1992-01-03 Anschlussklemme für Hochspannung

Country Status (6)

Country Link
EP (1) EP0494807B1 (de)
AT (1) ATE136164T1 (de)
AU (1) AU661291B2 (de)
DE (1) DE69209325T2 (de)
ES (1) ES2084298T3 (de)
FR (1) FR2671670B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2719704B1 (fr) * 1994-05-05 1996-05-31 Gec Alsthom T & D Sa Dispositif de liaison électrique d'un élément conducteur sur un appareil électrique.
DE102019214006A1 (de) 2019-09-13 2021-03-18 Siemens Energy Global GmbH & Co. KG Deckeleinheit für einen Wandlerkopf einer Hochspannungs-Wandlereinrichtung, Wandlerkopf und Hochspannungs-Wandlereinrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643003A (en) * 1970-04-24 1972-02-15 Ite Imperial Corp Transformer termination for metal-enclosed, compressed-gas-insulated electrical conductors
US4234757A (en) * 1978-05-31 1980-11-18 Amerace Corporation Electrical cable accessories configured for lubricated installation
DE8008657U1 (de) * 1980-03-27 1980-06-26 Siemens Ag, 1000 Berlin Und 8000 Muenchen Gas- oder fluessigkeitsisolierter, induktiver spannungswandler
ATE6448T1 (de) * 1980-03-27 1984-03-15 Siemens Aktiengesellschaft Gas- oder fluessigkeitsisolierter stromwandler.
GB2154382B (en) * 1983-12-14 1988-04-07 Raychem Ltd High voltage connector

Also Published As

Publication number Publication date
AU1013192A (en) 1992-07-16
DE69209325T2 (de) 1996-08-14
FR2671670A1 (fr) 1992-07-17
ES2084298T3 (es) 1996-05-01
AU661291B2 (en) 1995-07-20
DE69209325D1 (de) 1996-05-02
FR2671670B1 (fr) 1993-04-09
ATE136164T1 (de) 1996-04-15
EP0494807A1 (de) 1992-07-15

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