DD208015A1 - ELECTRICALLY CONDUCTIVE CONNECTION - Google Patents

Abstract

The invention relates to an electrically conductive connection between a conductor and a connection element, preferably a press connection between a multi-conductor conductor made of an aluminum conductor material and a connection device. OBJECTIVE AND OBJECT OF THE INVENTION TO OBTAIN A MINIMUM LONG-TERM STREET TRANSITION AND TO MAINTAIN THIS UNDER ENVISAGED ENVIRONMENTAL CONDITIONS, OBTAINING AN ELECTRICALLY CONNECTED LINK WHICH IS ECONOMICALLY MANUFACTURED WITH PERMANENT QUALITY. ERFINDUNGSGEMAESS IS between the individual wires OF MORE- / stranded HEAD WITH EACH OTHER AND THE TO JOINED CONNECTION ELEMENT ON CONTACT AGENTS COMPRISING NEUTRAL GREASE, REIBE FUNDS AND chemically reacting complexing agents, ARRANGED, WITH AFTER A PRESS PROCESS THE ELEMENTS OF SCRAPE ACCORDANCE PENETRATION of the surface oxide IN DIRECT METAL AND ELECTRICALLY CONDUCTIVE CONTACT WITH THE MATERIALS OF THE CONDUCTIVE ELEMENTS TO BE CONNECTED. ELECTRICALLY CONNECTING CONNECTION IS PARTICULARLY USEFUL IN THE MANUFACTURE OF ELECTRICAL INSTALLATIONS IN ELECTRICAL PLANT CONSTRUCTION AND IN ENERGY SUPPLY SYSTEMS.

Description

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, Title of the invention,.

Electrically conductive. 'Connection. '

Field of application of the invention -.

  The invention relates to an electrically conductive connection between a conductor made of aluminum or its alloys and a connecting or connecting element made of aluminum or any conductor material, preferably a .Preßverbindung between a multi-strand or fine-stranded conductor of an aluminum conductor material and a connection fitting Connection can be used in particular in the manufacture of electrical installations in electrical plant construction and in energy supply systems.

Characteristic of the known technical solutions.

As a result of the behavior of the aluminum, which is increasingly being used as conductor material, with respect to atmospheric influences, in particular moisture and oxygen, 'the production of electrically conductive compounds is problematical, since the aluminum conductor is covered'. Removal of rapidly forming oxide layer significantly affects the electrical contact resistance at the junction.

'To improve the contact behavior, it is according to TGL 21590/01 point 4.3. known, prior to making the electrical connection, the Oberflächenoxidsohicht'the aluminum conductor ·.

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mechanically, immediately grease the conductor with a neutral grease and then make the connection. This method is imperfect, since it is rarely possible, especially in multi-stranded and fine-stranded conductors, to sufficiently remove the oxide layer and completely grease it. Due to atmospheric influences, a new oxide surface layer is formed immediately, the electrical transition resistance is constantly increasing and at the contact point an impermissible heating often occurs during current flow, so that the fat melts away and further protection of the contact point is no longer guaranteed Burning the contact elements and thus to complete failure of the associated system 'lead. ,

It is still according to aluminum paperback, 1.1. Edition p. 788 known, hard to reach contact points or those that need to be solved frequently, to brush with a contact paste, which consists of vaseline and hard metal shavings. At sufficient contact pressure, the metal chips press into the aluminum surface, pierce the oxide layer and thus convey. a metallic contact. Although such an electrically conductive connection points can be expected to destroy the surface of the oxide surface at the contact surfaces, in a short time the same effects as in the application of pure fat occur. A minimal permanent and long-term stable 'electrical contact resistance can not be achieved with an electrical connection made with these means. , , /.

Object of the invention. · "... ~

Zeil of the invention is the disclosure of an electrically conductive compound with at least one conductor of aluminum or its alloys, - which is simple in construction, can be economically produced at any place with'reproduzierbarer- lasting-quality; 'can and: trouble-free and maintenance-free Operation of electrical installations. '>'

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- Explanation of the essence of the invention

The object of the invention is to provide an electrically conductive connection for conductors made of aluminum or its alloys, in particular for multi-stranded or fine-stranded conductors, which has minimal long-term stable contact resistance, maintains this under elevated, for example, atmospheric conditions, and permanently good power transfer guaranteed. ? '

This is achieved according to the invention substantially in that between the individual wires of the multi / fine stranded conductor with each other and the connecting element to be connected, a contact means, consisting of a neutral grease, "electrically" rubbing agents and one or more complexing agents arranged in which, after the pressing operation with an optimum pressing force of 45% of the tensile strength of the conductor material, the particles of the friction medium after penetration of the surface oxide layer of the aluminum alloy material are in direct metallic and electrically conductive contact with the materials to be connected to the conductor elements , The contact agent with the complexing agents fills all cavities present in the area of the connecting parts and; protects the connection against atmospheric influences. The metal ions possibly formed at the contact point, for example aluminum ions of the electrical conductor, are chemically bonded by the complexing agent, whereby the formation

..a passivating: or electrically insulating surface layer is prevented. The mass ratio of the proportions of this.

Contact agent, grease: friction agent: complexing agent is preferably 100: 20: 1, as a friction agent are metal powder, shavings or * granules, preferably of nickel, chromium, zinc or copper as well as carbides, nitrides or borides, preferably the metals titanium , Vanadium., Tungsten or chromium individually or in combination with each other homogeneously distributed in the contact agent. The complexing agents of the contact agent are amines or: other chelating agents, in particular ethylenediaminetetraacetic acid.

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and their salts. The fat of the contact agent is preferably a silicone grease. The electrical connection can also be made between single-wire conductors with a terminal element as a press connection. Even with releasable screw connections with an optimum pressing pressure, an improvement in the long-term stability of the contact resistance occurs. '

embodiment

The invention will be explained in more detail with reference to exemplary embodiments. '

- The inventive electrically conductive compound. According to a first embodiment of a multi-wire electrical conductor made of aluminum or an aluminum alloy with single wire diameters of 0.5 mm, weIcher is pressed with the addition of a contact means with a Preßkabelschuh. This contact means is arranged between the individual wires and the sleeve of the Preßkabelschuhes. The contact agent, consists of a neutral fat, electrically conductive. Rubbers and a chemically reactive complexing agent, preferably in a Mass.eververhältnis 100: 20: i. Silicone fats are preferably used as fats, since they have a relatively high melting interval and thus also withstand elevated temperatures, such as those which restrict the flow of starch and which occur in high-pressure connections. In this grease are electrically conductive. Friction agent such as. Metal powders, shavings, and / or granules, preferably of nickel and / or chromium and / or zinc and / or copper and / or carbides, nitrides, borides preferably of the metals titanium, vanadium, tungsten or chromium homogeneously distributed to the metallic Make contact at the junction and positively influence. As a complex. Substances' are. Kontaktmitt.el in, for example, amines; insbesondere'Ethylendiamintetraessigsäure · '(EDTA)' and its 'salts "and / or other chelating ^agents'..:

For the preparation of the electrically conductive according to the invention

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Connection is applied to the end of the stripped stranded conductor, the contact means by brushing, dipping or other types of application so that between the individual wire en with each other ... and the sleeve 'contact medium is present. The subsequent pressing takes place with an optimum pressing force at which the necessary withdrawal force of the conductor from the fitting is about $ 45 of the tensile strength of the conductor material. During the .Preßvorganges is by '; the forming operation in cooperation with the particles of the friction means destroys the alumina surface layer of the conductor in many places, whereby a metallic contact between the individual wires of the conductor with each other ⁽

  'as well as the valve comes about. This achieves a minimum electrical transient resistance. At the same time, the contact agent fills in remaining voids within the connection and shields them permanently from the external action of corrosive media. The complexing agent present in the contact agent binds under corrosive conditions.

, Any resulting metal ions from, so that they are not available to form a passivating or electrically insulating surface layer. As a result of the complex action of all constituents of the contact agent, a synergistic effect occurs, as a result of which the long-term behavior, in particular of aluminum pressing compounds, is substantially improved.

This long-term stabilizing effect also occurs ^; for connections between aluminum or its alloys and other conductor substances. Es- a complexing agent is applied in this case, which of all _{Metalllo.nen:} abbindet domestic the junction occurring metals. It can . ; also several complexing agents are used for setting - the various .- metal ions. , , ':. .-. '

~ The electrical connection can also be between one on ^; stranded conductor and a connection fitting ^{1 are made} under the attachment of the contact means as · Preßverbinduns.

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The use of the contact agent in the production of detachable electric screw connections also results in better contact retention and increased long-term stability of the electrical contact resistance compared to screw connections without contact means, on account of the effects already described. :. '.

Claims (6)

23 3 90 3 5 Srfindungsans-prucli 1. Electrically conductive connection between a conductor made of aluminum or its alloys and a connection or connection element, made of aluminum or any conductor material, - "preferably a press connection between a multi-strand or fine-stranded conductor and a connection ^ fitting, characterized that between the individual wires of the multi-stranded / fine-stranded conductor with one another and the connection element to be connected, a contact means consisting of a neutral grease, electrically conductive rubbing agents and one or more complexing agents is arranged, such that after the pressing operation the particles of the friction means follow Penetration of the surface oxide layer of the aluminum conductor material is in direct metallic and electrically conductive contact with the materials of the conductor elements to be connected, and the contact agent with the complexing agents fills all cavities present in the area of the junction, and d The connection against atmospheric influences concludes. 2. Electrically conductive compound according to item 1, characterized in that the mass ratio ^{1 of} the proportions of the contact agent, fat: friction agent: complexing agent is preferably 100: 20: 1 _; 3. Electrically conductive compound according to item 1 and '2, characterized in that as a friction agent metal powder, shavings or granules, preferably of nickel, chromium, zinc or copper and carbides, nitrides or borides, preferential' , The metals titanium, vanadium, tungsten or chromium are individually distributed homogeneously or in combination with one another in the contact agent. ''_; 23 3 90 3 5 4 .. Electrically conductive connection to. Points * l to 3, characterized in that as complexing agents amines and / or other chelating agents, in particular ethylenediaminetetraacetic acid and their salts are contained in the contact agent. 5. Electrically conductive compound according to item 1 to 4, characterized in that the fat of the Eontaktmittels is preferably a silicone grease, which ensures a sufficient "reliability at permissible" 'temperature loads .// 6.- Electrically conductive connection according to item 1, characterized in that instead of the multi / fine stranded conductor an efndrähtiger conductor is connected to the connecting element. '.