Installation of contact connections. General requirements. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Installation of contact connections. General requirements. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electric installation work

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With the help of contact connections (CC), the elements of the electrical circuit are connected to each other and sources and consumers of electricity.

Electrical contact called the contact of the elements, ensuring the continuity of the electrical circuit. In other words, it is a constructive unit that forms a contact, a connection.

Electrical contact between conductors is carried out by pressing one current-carrying element to another with the help of bolts, screws, clamps, springs, rivets, joint deformation (crimping, twisting), as well as welding, soldering or adhesive bonding - gluing.

Contact connections are divided into non-separable, collapsible and detachable.

Non-separable contact connections - such joints that cannot be disassembled without destroying at least one of the parts to be joined or the material to be joined (welded, soldered, riveted, pressed and adhesive joints).

Collapsible contact connections - can be disassembled without destroying the connected parts (bolted, screw and wedge connections).

Detachable contact connections - devices consisting of a plug and a socket.

Connections according to the type of connection of current-carrying parts can be divided into all-metal with a physical welded contact and compressive with a mechanical (compressive) contact. Compression joints can be simple or complex. The first are formed between two conductors that are solid in structure, the second - between a stranded wire and a tip (sleeve, etc.) or between two stranded wires.

According to the purpose, contact connections operating in open and closed switchgears are divided into connections, connections and branches.

For long-term transmission of normal mode currents and short-term emergency mode currents, contact connections of current-carrying parts of electrical installations are used, the parameters and characteristics of which must comply with standards and specifications.

The resistance of the contact connection after its manufacture should not be greater than the resistance of the equivalent section of the whole conductor. If the contact connection is formed by conductors of different materials, its resistance should be compared with the resistance of an equivalent section of the conductor, which has a lower conductivity.

During operation, the resistance of the contact connection should not exceed 1,8 of the resistance value of the whole core.

Author: Bannikov E.A.

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