RU149928U1 - POWER CABLE, NOT DISTRIBUTING COMBUSTION - Google Patents

Abstract

A power cable that does not propagate combustion, containing either one conductive core made with insulation (1), or three conductive wires made with insulation (1) and twisted into a core, as well as laid on a core or core or in series with an inner sheath (2 ), a shield and an outer shell (3), or a sequentially located inner shell (2), an armor and an outer shell (3), or a sequentially located inner shell (2) and an outer shell (3), or an outer shell (3), this isolation (1), as well as the shells (2) and (3) are made of extruded PVC low fire hazard plastic, characterized by the oxygen index respectively AA, A, the maximum specific optical density of the smoke when burning, respectively, BB, B, the maximum specific optical density of the smoke when smoldering, respectively, C, C , C, mass fraction of hydrogen chloride released during combustion, respectively DD, D, tensile strength, respectively EE, Ei, and elongation at break, respectively, FF, F, so A≥30 %, A≥28%, A≥35%, 150 <В≤280, В≤150, В≤200, С≤200, С≤150, С≤200, D≤150 mg / g, D≤50 mg / g, D≤140 mg / g, E≥14.5 MPa, E≥3 MPa, E≥12 MPa, F≥250%, F≥190%, F≥240%.

Description

The technical field to which the utility model relates.

The utility model relates to designs of power electric cables, characterized by the use of means of protection against damage caused by extreme temperature (overheating) or ignition, namely, the use of materials resistant to ignition.

State of the art

Cables that do not spread combustion are known (for example, “High-voltage flexible power cables” TU 16.K09-158-2005, KGENSh cable).

Signs of the known cable, coinciding with the features of the claimed utility model, consist in the execution of the shell of a material resistant to ignition.

The reason that prevents the obtaining in a known technical solution of a technical result, which is provided by the claimed utility model, is the execution of a shell made of rubber.

The closest analogue (prototype) is a power cable that does not propagate combustion, containing conductive conductors twisted in one direction, each of which is covered with insulation made of polyvinyl chloride plastic grade I40-13A (GOST 5960-72), and a sheath of polyvinyl chloride plastic compound located on top of conductive wires NGP 40-32 brands according to TU 2246-010-0576190-96 (Belorussov NI Electrical cables, wires and cords. M: Elektroizdat, 1987, p.251).

Signs of the known cable, coinciding with the features of the claimed utility model, consist in the implementation of the insulation and the sheath of polyvinyl chloride plastic.

The reason that prevents obtaining a technical result in a known technical solution, which is provided by the claimed utility model, is that the cable does not satisfy the requirements for non-proliferation of combustion during group installation and in conditions of fire there is a significant emission of smoke and hydrogen chloride.

Utility Model Disclosure

The problem the utility model aims to solve is to ensure the non-proliferation of cable combustion during group installation while meeting the requirements for the mass fraction of hydrogen chloride in the composition of smoke products of combustion of not more than 150 mg / g and strength characteristics.

The technical result is to reduce smoke during combustion and decay, to reduce the release of hydrogen chloride during combustion and to increase the strength characteristics.

The technical result is achieved in that the power cable, which does not propagate combustion, contains either one conductive core made with insulation 1, or three conductive wires made with insulation 1 and twisted into a core, as well as laid on a core or core or sequentially located inner sheath 2, the screen and the outer shell 3, or sequentially located inner shell 2, the armor and outer shell 3, or sequentially located inner shell 2 and outer shell 3, or outer shell 3, while insulation 1, as well as shells 2 and 3 are made of extruded PVC low fire hazard plastic, characterized by the oxygen index respectively A ₁ , A ₂ , A ₃ , the maximum specific optical density of the smoke when burning, respectively B ₁ , B ₂ , B ₃ , the maximum specific optical density of smoke during smoldering, respectively, C ₁ , C ₂ , C ₃ , mass fraction of hydrogen chloride released during combustion, respectively, D ₁ , D ₂ , D ₃ , tensile strength, respectively, E ₁ , E ₂ , E ₃ and relative ud Inonii at break respectively F _1, F _2, F _3, A ₁ so that ≥30%, A ₂ ≥28%, A ₃ ≥35%, 150 <B ₁ ≤280, B ₂ ≤150, B ₃ ≤200, C ₁ ≤200, C ₂ ≤150, C ₃ ≤200, D ₁ ≤150 mg / g, D ₂ ≤50 mg / g, D ₃ ≤140 mg / g, E ₁ ≥14.5 MPa, E ₂ ≥ 3 MPa, E ₃ ≥12 MPa, F ₁ ≥250%, F ₂ ≥190%, F ₃ ≥240%.

Distinctive features of the claimed utility model are the indicated numerical values of the parameters of the used polyvinyl chloride plastic.

Brief Description of the Drawings

In FIG. 1 schematically shows a cable comprising three insulated cores, an inner sheath, a shield and an outer sheath; in FIG. 2 schematically shows a cable comprising three insulated cores, an inner sheath, armor and an outer sheath; in FIG. 3 schematically shows a cable comprising three insulated cores, an inner sheath and an outer sheath; in FIG. 4 schematically shows a cable containing three insulated cores and an outer sheath.

Utility Model Implementation

An electric power cable that does not spread combustion includes either one conductive core (not shown in the figures) or three conductive conductors twisted into a core, each of which is coated with insulation 1 (Fig. 1-4).

Over the insulated core (or core) layers are laid according to the following possible cable options:

1) sequentially located inner shell 2, the screen 4 and the outer shell 3 (Fig. 1);

2) sequentially located inner shell 2, armor 5 and outer shell 3 (Fig. 2),

3) sequentially located inner shell 2 and outer shell 3 (Fig. 3);

4) the outer shell 3 (Fig. 4).

Insulation 1 and shells 2, 3 are made of extruded PVC compound of reduced fire hazard.

The plastic from which insulation 1 is made is characterized by an oxygen index A ₁ , maximum specific optical density of smoke during combustion B ₁ , maximum specific optical density of smoke during smoldering C ₁ , mass fraction of hydrogen chloride released during combustion, D ₁ , tensile strength E ₂ and elongation at break F ₁ .

The plastic material from which the inner shell 2 is made is characterized by an oxygen index A ₂ , a maximum specific optical density of smoke during combustion of B ₂ , a maximum specific optical density of smoke during smoldering C ₂ , mass fraction of hydrogen chloride released during combustion, D ₂ , tensile strength E ₂ and elongation at break F ₂ .

The plastic material from which the outer shell 3 is made is characterized by an oxygen index A ₃ , a maximum specific optical density of smoke during combustion B ₃ , a maximum specific optical density of smoke during smoldering C ₃ , mass fraction of hydrogen chloride released during combustion, D ₃ , tensile strength E ₃ and elongation at break F ₃ .

The specified parameters of the plastic compound from which the insulation 1 and shells 2 and 3 are made, have the following numerical values: A ₁ ≥30%, A ₂ ≥28%, A ₃ ≥35%; 150 <B ₁ ≤280, B ₂ ≤150, B ₃ ≤200; C ₁ ≤200, C ₂ ≤150, C ₃ ≤200; D ₁ ≤150 mg / g, D ₂ ≤50 mg / g, D ₃ ≤140 mg / g; E ₁ ≥14.5 MPa, E ₂ ≥3 MPa, E ₃ ≥12 MPa; F ₁ ≥250%, F ₂ ≥190%, F ₃ ≥240%.

The manufacture of a three-core power cable, not spreading combustion, is as follows (Fig. 1, 2).

Conductors are made of traditional twisted wire materials (copper, aluminum), traditional for electric cables, using conventional twisting equipment. Next, insulation 1 is applied to each conductive core on an extrusion machine, which is used as polyvinyl chloride plastic compound, including (wt.h): polyvinyl chloride 100, ester plasticizer 40-60, lead stabilizer 4-7, flame retardant smoke suppressor 60-130, ionol with diphenylolpropane in a ratio of 3: 1-1: 3 and / or titanium dioxide with kaolin dehydrated in a ratio of 2: 1-1: 2 10-20. After this, the isolated conductors are twisted in one direction in a midwind twist along all the windings with the formation of a core. Then, on top of the core on an extrusion machine, an inner shell 2 of polyvinyl chloride plasticate is applied, including (parts by weight): polyvinyl chloride 100, ester plasticizer 60-80, lead stabilizer 3-6, flame retardant smoke suppressor 120-520, ionol with diphenylolpropane in the ratio 3: 1-1: 3 0.4-1 and / or titanium dioxide with kaolin dehydrated in a ratio of 2: 1-1: 2 10-20. After that, over the inner sheath 2 in the first embodiment of the cable (Fig. 1), a screen 4 of copper strips or copper wires is laid using traditional equipment used in the cable industry. In the second embodiment of the cable (Fig. 2) over the inner sheath 2 on the armoring machines, usually used in the cable industry, impose armor 5 either from two steel galvanized tapes, which are positioned overlapping, or from steel wires or wires from aluminum or aluminum alloy . Then on top of the screen 4 (or armor 5) on the extrusion machine impose an outer shell 3 having the same composition as the inner shell 2.

In the third embodiment of the cable (Fig. 3) there is no screen (or armor), and the outer sheath 3 is laid on top of the inner sheath 2.

In the fourth embodiment of the cable, there is no inner sheath, a shield (or armor), and the outer sheath 3 is applied over the insulation 1.

In the manufacture of a single-core cable, the same technological operations with the same modes are used.

Claims (1)

A power cable that does not propagate combustion, containing either one conductive core made with insulation (1), or three conductive wires made with insulation (1) and twisted into a core, as well as laid on a core or core or in series with an inner sheath (2 ), a shield and an outer shell (3), or a sequentially located inner shell (2), an armor and an outer shell (3), or a sequentially located inner shell (2) and an outer shell (3), or an outer shell (3), this isolation (1), as well as shells (2) and (3) are made of extruded polyvinylchloride plastic of reduced fire hazard, characterized by the oxygen index A ₁ A ₂ , A ₃ , respectively, the maximum specific optical density of the smoke during combustion, respectively, B ₁ V ₂ , B ₃ , the maximum specific optical smoke density smoldering respectively C _1, C _2, C _{3, the} mass fraction of hydrogen chloride released during combustion, respectively, D _1, D _2, D _{3, the} strength at break, respectively, E ₁ E _2, E ₃ and elongation at break respectively -retarded F ₁ F _2, F _3, A ₁ so that ≥30%, A ₂ ≥28%, A ₃ ≥35%, 150 <V ₁ ≤280, B ₂ ≤150, ≤200 B _3, C ₁ ≤200 , C ₂ ≤150, C ₃ ≤200, D ₁ ≤150 mg / g, D ₂ ≤50 mg / g, D ₃ ≤140 mg / g, E ₁ ≥14.5 MPa, E ₂ ≥3 MPa, E ₃ ≥12 MPa, F ₁ ≥250%, F ₂ ≥190%, F ₃ ≥240%.

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