Electric four-wire cable

 

(57) Abstract:

The invention solves the problem of creating a high-performance cable due to characteristics of the produced single-phase short circuit occurring due to the ferromagnetic component of the bimetallic PEN-conductor (zero), which redistribute the heat effect of the third conductive parts. In the electric four-wire cable, the fourth lived which has a reduced cross-section, is used as a PEN conductor (zero), the device is activated third conductive parts, PEN-conductor designed as a bimetallic conductor consisting of a conductive metal, such as copper or aluminum, and a ferromagnetic metal, for example steel. The heat of the fourth residential cable passing through the cable short circuit current, at low values of current is dissipated only the fourth residential cable, and with increasing short-circuit current is higher than the permissible (for the cable) scatters advanced conventional ferromagnetic core formed of a ferromagnetic part of the fourth conductor and a separate external design, shunting her.

The invention relates to electrical engineering, preiudice energy at high power levels.

Known electric four-wire cable, the fourth lived which has a smaller cross-section, is used as a PEN conductor (neutral) (manual edited Belorussia N. M., Energoatomizdat, 1987, S. 62). To protect from overheating PEN-conductor single-phase short circuit (OKZ) it is necessary to increase the cross section of this PEN-conductor, which creates technical and financial difficulties.

The purpose of the invention is the creation of high-performance cable by taking into account characteristics is produced when OKZ arising due to the specially created redistribution of thermal effect of the third conductive parts.

This objective is achieved in that in an electric four-wire cable of the fourth vein, having a smaller cross-section, is used as a PEN conductor (zero), together with a shunt sides of the conductive parts, and she lived made of bimetallic conductor metal, such as copper, aluminum, and ferrous metal, such as steel, the ratio of content which is derived from the dependency:

,

where

Al,Fe- electrical resistivity conductor (non-magnetic) and FEMA, i.e.

,

where Sabout- the section of the PEN conductor;

Sf- the section of the phase conductor;

Sothe relative value of the current PEN-conductor made of conductive metal.

Single-phase short circuit occurs a redistribution of heat from PEN-conductor, between the fourth and residential shokiruyushie third conductive parts.

The heat of the fourth residential cable passing through the cable short circuit current, at low values of current is dissipated only the fourth residential cable, and with increasing short-circuit current is higher than the permissible (for the cable), scatters advanced conventional ferromagnetic core formed of a ferromagnetic part of the fourth conductor and a separate external design, shunting her.

Conventional ferromagnetic core to its magnetic field interacts with passing through it an electric current and thus all involved in the dissipation of heat from the fourth residential cable in case of short circuit.

Features produced bimetallic PEN-Explorer allow you to prevent exceeding the maximum allowable agreesto.

Electric four-wire cable, the fourth lived which has a reduced cross-section, is used as a PEN conductor (zero), the device is activated third conductive parts, wherein the PEN-conductor made of bimetallic conductor metal, such as copper, aluminum, and ferrous metal, such as steel, the content of which is determined from the dependence of

< / BR>
whereAl,Fe- electrical resistivity conductive, ferromagnetic metal, respectively;

the relative value of the lowest section of PEN-conductor, i.e.

< / BR>
where S0- the section of the PEN-conductor;

Sf- the section of the phase conductor;

the relative value of the current PEN-conductor made of conductive metal.

 

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