Classifications

• • 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
  • H01B17/14—Supporting insulators
  • H01B17/16—Fastening of insulators to support, to conductor, or to adjoining insulator
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
  • H01H33/008—Pedestal mounted switch gear combinations
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
  • H01H33/02—Details
  • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
  • H01H33/14—Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
  • H01H33/02—Details
  • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices

Definitions

• the invention relates to a ceramic insulating body made of brittle material with at least one metal frame, which surrounds an end region of the insulating body and has a flange with bores for receiving fastening means, and with a cement between the insulating body and the metal frame.
• Such an insulating body is known from DE-AS 1 139 897.
• Circuit breakers for large short-circuit powers and high operating voltages which need more than one switching chamber in each phase, generally have pole columns with a so-called
• Double switching head which has two horizontal switching chambers. Switching pieces for switching the current on and off are located in the switching chambers. They are surrounded by an insulating body and are attached to a vertical post insulator. Their associated switching mechanism is connected to a drive on the base of the vertical support insulator via a drive rod made of insulating material.
• the insulating bodies are screwed to one another as well as to adjacent metal housings. This presupposes that the (brittle) insulating bodies, which are made from particularly high-quality porcelain, have a socket or fitting made of metal (for example aluminum), which gives off a partner surface for the screw connection.
• Such an insulating body made of porcelain can be equipped with a metal frame, which is attached to one end of the insulating body and encompasses the insulating body in a small area from the outside.
• the metal frame can have a corrugated contour on its inner surface.
• a cement cement can be arranged immediately below.
• a layer of "release lacquer" can be applied to a glaze layer of the porcelain, which is located directly under the cement cement.
• the release varnish can be a permanently elastic bitumen varnish with direct adhesion of the cement on the porcelain glaze prevented. Under the glaze layer there can be a split zone with more or less irregularly shaped or round grains.
• the invention is based, to prevent high local forces on the insulating body in a connection between an insulating body made of brittle material and a metal frame.
• the flange between the bores and the insulating body has a relief groove running at a fixed distance from the surface of the insulating body about the central axis of the insulating body and that a bandage made of thin plastic film is arranged directly on the insulating body under the cement .
• the relief groove reduces the rigidity of the metal frame when, for example, a (static ) bending stress occurs in the case of a vertical arrangement of the insulating body; in this case, instead of an almost punctiform force acting on the insulating body, there is a large area load, which prevents the insulating body from breaking.
• FIG. 1 shows in section a part of one end of a horizontally arranged insulating body made of porcelain equipped with a metal fitting.
• Fig. 2 shows the section through a pole column with a horizontal double switch head.
• a (in cross section) insulating body (1) made of porcelain can be seen in longitudinal section, which is hollow on the inside and surrounds a switching chamber.
• This switching chamber is part of a pole column ( 2 ) shown in Fig. 2 with a horizontal double switching head (3).
• the end of the insulating body (1) is surrounded by a metal frame (4).
• the insulating body (1) is attached to a lever housing (5), which is shown in section in Fig. 2.
• the metal frame (4) on the side which is fastened to the lever housing (5) has a flange (6) which surrounds a (round) end face of the insulating body (1) in a circle and has holes which are uniformly distributed over its circumference. Fastening screws (7) are guided through these holes and hold the metal frame (4) on the lever housing (5).
• the inner surface of the flange C6) is interspersed with longitudinal and transverse grooves.
• a cement (9) which consists for example of cement.
• the shaping of the inner surface serves to improve the power transmission between the metal frame C4) and cement (9); the strength of torsional, tensile and compressive stresses should be increased.
• a split zone (10) with more or less irregular or round grains under a glaze. These grains are applied to the porcelain before the glaze is applied and bond firmly to the porcelain during the glaze firing. This split zone (10) is also intended to increase the strength under torsional, tensile and compressive loads.
• the cementing (9) is provided on the side facing the lever housing (5) with a kit groove running around the insulating body (1), through which the insulating body (1) is positioned and. Amount of vertically acting forces can be changed in a favorable manner.
• a bandage (11) consisting of a thin plastic film serves to prevent the unfavorable power transmission described.
• the bandage (11) is wound around the insulating body CD in the region of the split zone (10).
• the bandage (11) as a multi-layer winding of the plastic film rises towards the extreme end of the insulating body (1) (in the direction of the lever housing 5) executed.
• An O-ring seal (12) is arranged in a groove between the insulating body (1) and the lever housing (5). It is intended to prevent shielding gas from escaping from the control chamber.
• the measures described above for securely attaching a metal socket (4) to a brittle insulating body (1) can not only be usefully implemented on the metal socket (4) connected to the lever housing (5), but they are also suitable for others for fastening metal frames (4) determined by insulating bodies (1).
• the pole column has a plurality of porcelain insulating bodies which are hollow on the inside and which are provided with metal sockets.
• the pole column rests on a substructure (13) which has a drive inside for moving a drive rod.

Landscapes

• Insulators (AREA)
• Insulating Bodies (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6439739

Family Applications (1)

Country Status (2)

Families Citing this family (3)

Citations (3)

Family Cites Families (1)

• 1991
  • 1991-09-03 DE DE19914129233 patent/DE4129233C1/de not_active Expired - Fee Related
• 1992
  • 1992-08-27 WO PCT/EP1992/001969 patent/WO1993005522A1/de unknown

Patent Citations (3)

Also Published As

Similar Documents

Legal Events