RU70726U1 - CABLE MEASURING - Google Patents

Abstract

The utility model relates to cable technology, namely to measuring cables. Insulated conductors are twisted together in pairs. The screen for a pair of cores is made in the form of a winding from an aluminum-polymer tape with metal inwards with a contact conductor made of tinned copper wire laid under it. On top of the screen a winding of lavsan tape is applied, an inter-screen layer made of mica-containing tape superimposed with overlapping. The common screen is made in the form of a braid of tinned copper wires. Over it a winding of lavsan tape and a protective sheath of a halogen-free polyolefin composition are applied. EFFECT: reduced smoke emission in fire conditions.

Description

The utility model relates to the field of electrical engineering, namely to the construction of measuring cables intended for the needs of the national economy and export, which can be designed to transmit low-level signals to the information collection system during fixed installation, including outside the containment area in AC systems.

Known cable containing at least one pair of single-wire or multi-wire conductive cores, coated with polymer insulation and twisted together. A polyimide film with a longitudinal overlay or in the form of a winding with overlapping, a screen in the form of a braid of tinned copper wires is laid over twisted cores. The shielded pairs are twisted into a cable and an inter-screen layer consisting of a winding with a polyimide film is applied on top. A braided screen made of tinned copper wires is superimposed on top of the inter-screen layer. A protective sheath of polyvinylchloride plastic compound has been applied over the screen (Nomenclature reference book for cables and wires. OAO Expocable, Podolsk, 2000, p. 28).

This technical solution is the closest to the proposed combination of features.

The disadvantages of the known cable include the fact that it does not meet the requirements for non-distribution of combustion when laying in bundles, for smoke emission during combustion and smoldering, as well as for the corrosion activity of smoke and gas products (halogen-containing compounds are released during combustion), which leads to negative consequences for human health, as well as the failure of transmitting information electronic equipment.

The task was to develop the design of the measuring cable, which has a reduced smoke emission and does not emit halogens in a fire, while maintaining a high degree of non-proliferation of combustion when laying the cable in bundles.

The technical result is achieved in that the measuring cable containing at least one pair of single-wire or multi-wire conductive wires coated with polymer insulation and twisted together, a screen sequentially laid on top of them, an inter-screen layer consisting of a winding of a polymer tape, a common screen in the form of a braid made of tinned copper wires and a protective sheath made of a polymer composition, additionally contains two windings of mylar ribbon on top of the pair screen and the common screen, the screen for a pair of cores is made in the form of a winding of aluminum-polymer tape with metal inside with

beneath it is a contact conductor of tinned copper wire, the inter-screen layer is made of a mica-containing tape, superimposed overlapping, and the protective shell is made of a halogen-free polyolefin composition.

If there is more than one pair of conductive conductors in the cable, the pairs of conductive conductors shielded and wrapped in lavsan tape are twisted into a core.

The utility model is illustrated in the drawing, which shows a measuring cable in section.

The cable contains conductive conductors 1, coated with insulation 2 and twisted in pairs, a screen for a pair of conductors made in the form of a winding of aluminum-polymer tape 3 with metal inward with a contact conductor 4 made of tinned copper wire laid under it, winding 5 with mylar ribbon, cross-layer layer 6 into in the form of a winding of mica-containing tape, a common screen 7 in the form of a braid of tinned copper wires, a winding 8 of dacron tape, and a protective sheath 9 of a halogen-free polyolefin composition.

The following is information confirming the feasibility of implementing a utility model.

The cable is made from well-known commercially available materials.

Cable manufacturing technology is traditional and boils down to the following.

The wire for the manufacture of conductive conductors 1 is made by drawing. Stranded cores 1 are twisted from separate wires on a cigar or frame type machine.

The insulation 2 and the protective sheath 9 are applied to the extrusion equipment.

The screen 3 of the aluminum-polymer tape is superimposed by a spiral winding on a wrapping machine.

The contact conductor 4 of tinned copper wire is made of soft copper wire and laid in a straight line.

The windings 5, 6 and 8 are applied on a winding machine.

The common screen 7 is superimposed on the braiding machine.

Samples of the proposed measuring cable were tested for non-propagation of combustion when placed in a beam in accordance with GOST R IEC 60332-3-23-2005 for smoke generation in accordance with GOST R IEC 61034-2-2005, for the corrosion activity of combustion products in accordance with GOST R IEC 60754-1-99 and GOST R IEC 60754-2-99. The results are shown in the table.

Cable specifications Name of characteristic Technical requirements Cable product Famous cable Proposed cable 1. Compliance of cables with fire safety requirements: 1.1. Non-proliferation of combustion in accordance with GOST R IEC 60332-3-23-2005, category B The length of the burnt area is not more than 2.5 m more than 3.0 m, does not match no more than 1,5 m, corresponds 1.2. Smoke during combustion and decay according to GOST R IEC 61034-2-2005 Light transmission at least 60% 45-50% does not match 90-96% match 1.3. Corrosion activity of smoke and gas products during combustion and decay according to GOST R IEC 60754-2-99: - gas content of halogen acids in terms of Hcl no more than 5.0 mg / g 29 does not match less than 4.0 corresponds - conductivity of an aqueous solution with adsorbed smoke products not more than 10.0 μS / mm 13-20 does not match less than 9.0 corresponds 2.1-2.5 4,5-4,7 pH value (acid value) not less than 4.3 does not match corresponds to

Claims (2)

1. Measuring cable, containing at least one pair of single-wire or multi-wire conductive conductors coated with polymer insulation and twisted together, a screen sequentially laid on top of them, an inter-screen layer consisting of a winding of a polymer tape, a common screen in the form of a copper braid tinned wires and a protective sheath made of a polymer composition, characterized in that it additionally contains two windings of mylar ribbon over the screen of a pair of cores and a common screen, the screen for a pair of cores is made in the form of a winding alumopolymer and from inside with metal tape laid underneath contact conductor tinned copper wire mezhduekranny layer is made of mica tapes, overlaid with overlapping, and the protective sheath is made of a polyolefin composition containing no halogen. 2. The cable according to claim 1, characterized in that the shielded and wrapped dacron tape pairs of conductive conductors are twisted into a core.