FR2481012A1 - MODULE FOR THE PROTECTION OF ELECTRIC ISOLATORS AGAINST LUMINESCENT DISCHARGES - Google Patents

Abstract

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

Description

248 1012

  This invention concerns a module for the protection of isolates

  Electrical meters against luminescent discharges, module which can be adapted to tube insulators, bearing insulators or auxiliary insulators used in working chambers, installations for thermo-chemical treatment, by glow discharges of components. Components are known to protect electrical insulators

  against glow discharges. These components, which are used specifically

  in order to protect the tube insulators, are constituted by an insulating body to which an anode element and a cathode element are connected respectively connected to the anode and to the cathode and positioned in such a manner as to delimit between them and with the insulating body. a throat in the shape of a pipe. This groove has a shape and a width variable in the direction of its length and determined by the conditions established inside the processing chamber of the installation. The surfaces formed by the throat are

  at very different temperatures.

  The main disadvantages of this type of module are the narrow range of admissible pressures when the insulator is protected, its weak

  tension of rupture, its difficulty of realization and the necessity of a cooling

forced eviction.

  The object of the present invention is to provide a module for

  protection against glow discharges, which can be effectively used within a wide range of pressures, which has a high breakdown voltage, which is of simple structure and

  which does not require forced cooling.

  The invention achieves this goal by providing a protection module

  electrical insulators against glow discharges, which is con-

  formed of an insulating body, consisting of at least two parts, an insulating body on which are fixed an anode element and a cathode element and between them, at least one intermediate element conducting the current, which is electrically isolated from the elements which surround. All these elements have surfaces shaped so as to delimit between them and with the insulating body labyrinth openings of a constant width which is determined according to the conditions established within the

  chamber processing facility.

  The main advantages of the module according to the present invention are that it can be used in a wide range of pressures, has a high breakdown voltage, is of a simplified structure and that

  does not require forced cooling. It is also extremely reliable

  and can be applied to all kinds of insulators, for example

2 4 8 10 12

  Tube Insulators, Bearing Insulators or Auxiliary Insulators.

  Several embodiments of the present invention will be described hereinafter by way of non-limiting examples and with reference to the accompanying drawings in which - Figure 1 is a sectional view of a module according to the invention for an isolator to tube, comprising two intermediate elements conducting the current; - Figure 2 is a sectional view of a module for a bearing insulator; FIG. 3 is a sectional view of a module for an auxiliary insulator; FIG. 4 is a sectional view taken through a part of the treatment chamber of an installation in which the

modules of Figures 1 and 2.

  FIG. 1 shows a module comprising an insulating body 1,

  arranged in three parts, on which are fixed the cathode element 2 connected to the cathode, the anode element 3 connected to the anode and interposed between these two elements, two intermediate conductor elements of the current 4, which

  are electrically insulated by the different parts of the insulating body 1.

  The surfaces of the anode element 3, the cathode element 2 and the conductive intermediate elements of the current 4 have a configuration such that they delimit between them and with the insulating body labyrinth-shaped openings. These openings have a constant width over all

  their length, which width is chosen according to the operating conditions.

  the treatment chamber of the installation.

  FIGS. 2 and 3 show other embodiments of the invention in which a single intermediate element conducting the current

4 is planned.

  Figure 4 shows examples of applications of the module

  only one intermediate conductor element of the current 4, on tube and bearing insulators, installed in the treatment chamber of an installation

  for the thermo-chemical treatment of components by electric discharges.

  The number of conducting intermediate elements of the current 4 is determined as a function of the insulation voltage of the electrical insulator and by the range of working pressures inside the treatment chamber of the installation. In the case where two intermediate elements 4 are provided,

  three labyrinth-shaped openings 5 are made with a desired width

  completed according to the operating conditions of the room of the

tallation.

24810 12

  Thanks to the labyrinth shape of the openings 5, the conditions under which the glow discharge takes place in the treatment chamber are such that the penetration of the current-conducting particles into the openings is prevented and thus the surfaces of the insulating body I are not exposed. soiled.

Claims (1)

CLAIM   Protection module for electrical insulators against   luminescent charges, comprising an insulating body to which an anode element and a cathode element are attached, characterized in that the insulating body (1) consists of one or more parts and in that between the cathode element (2), the anode element (3) and the insulating body (1) are interposed with at least one conductive intermediate element of the current (4) the surfaces of these elements having configurations such that between the conducting intermediate elements of the current (4), the cathode element (2), the anode element (3) and the insulating body (1) are delimited by the openings   labyrinth-shaped having a constant width throughout their length.