CN205881515U - Thin insulating high electrical property cable of regulator cubicle interior - Google Patents

Abstract

A cable with thin insulation and high electrical performance for use in an electrical cabinet. Its structure is as follows: a conductor is wrapped with an insulating layer to form a core; Copper tape layer; the copper tape layer is wrapped with a polyester film layer; the polyester film layer is wrapped with a sheath layer; in the cable core: the conductor is a copper wire with a cross-section of [0.5mm ² , 1.5mm ² ]; the insulation The layer is made of extruded insulating cross-linked polyethylene material, and the thickness of the insulating layer is [0.3mm, 0.5mm]; the inner and outer cores are twisted in the opposite direction; the wrapping layer is made of polyester wrapping Tape wrapping structure, the average thickness of the wrapping layer is [0.0180mm, 0.0485mm]; the copper tape layer is closely attached to the polyester film layer, and the average value of the total thickness of the copper tape layer and the polyester film layer is [0.556mm] , 0.700mm]; the sheath layer is composed of extruded thermoplastic polyolefin materials, and the thickness range of the sheath layer is [1.44mm, 1.58mm]; the stranding direction of the outer core and the wrapping of the wrapping layer The direction is opposite; the winding direction of the wrapping layer is opposite to that of the shielding layer.

Description

Thin insulated high electrical performance cables for use in electrical cabinets

technical field

The technical solution relates to the technical field of cables, in particular to cables used in electrical/control cabinets.

Background technique

Due to the relatively small space in the electrical/control cabinet, a large number of wires and cables are used in the electrical cabinet for power supply and signal transmission, including the connecting wires and cables between equipment and the wires and cables used inside the equipment. Due to the characteristics of the arrangement and position of the electrical components in the control cabinet, special wires/cables need to be bent and arranged along the wiring grooves, etc., so the general requirements of the wires/cables are mechanical properties such as bending resistance and crack resistance. Because there are many types and quantities of electrical components in the control cabinet, and the electromagnetic interference between them is large, the anti-electromagnetic interference requirements for special wires/cables are relatively high. Generally speaking, in order to achieve the anti-electromagnetic interference requirements of the cables themselves, Such as metal shielding tape and/or metal shielding mesh will be added to the structure of the cable (which cannot be realized by pure wires), which in turn reduces the mechanical properties of the cable. For this reason, thick insulating layers and sheath layers have to be used to increase the mechanical properties of special cables. In the prior art, the requirements adopted by most cable users and manufacturers are: the relationship between the insulation thickness of the electrical/control cabinet cable/the sheath thickness/the maximum outer diameter of the cable (taking the withstand voltage of 500V as an example): the cross-section of a single copper core conductor 0.5-1.5mm ² corresponds to an insulation thickness of 0.6mm, an outer sheath thickness of 0.8mm, and a maximum outer diameter of the cable of 4.3-5.0mm. The insulation material is insulating rubber, and the sheath material is nitrile rubber.

The narrow environment and various slots in the electrical cabinet require the outer diameter of the cable to be as low as possible. Under the premise of ensuring the high electrical performance requirements of the cable and ensuring the daily power supply and signal transmission function/performance, the above relationship is no longer suitable for new industry requirements. For electrical cabinets, it is also necessary to directly affect the personal safety of operating personnel in terms of service life, low-smoke characteristics, halogen-free characteristics and flame-retardant characteristics.

Invention content:

In order to solve the above problems, this technical proposal proposes a cable for electrical cabinets with thin insulation and high electrical performance. electrical performance.

A cable with thin insulation and high electrical performance for use in an electrical cabinet. Its structure is as follows: a conductor is wrapped with an insulating layer to form a core; Copper tape layer; the copper tape layer is wrapped with a polyester film layer; the polyester film layer is wrapped with a sheath layer;

In the cable core: the conductor is a copper wire with a cross-section of [0.5mm ² , 1.5mm ² ]; the insulating layer is made of extruded insulating cross-linked polyethylene material, and the thickness of the insulating layer is in the range of [0.3mm, 0.5mm mm]; the plurality of wire cores are divided into inner and outer layers, the number of inner layer wire cores: the number of outer layer wire cores is [1:1.5, 1:2.6]; the twisting directions of the inner and outer layer wire cores are opposite;

The wrapping layer is made of polyester wrapping tape, and the average thickness of the wrapping layer is [0.0180mm, 0.0485mm];

The copper tape layer is closely attached to the polyester film layer, and the average value of the total thickness of the copper tape layer and the polyester film layer is [0.556mm, 0.700mm];

The sheath layer is made of extruded thermoplastic polyolefin material, and the thickness range of the sheath layer is [1.44mm, 1.58mm];

The twisting direction of the outer core is opposite to that of the wrapping layer; the wrapping direction of the wrapping layer is opposite to that of the shielding layer.

The conductor is a round solid annealed copper wire.

The average thickness of the polyester wrapping tape is the coverage rate (15%, 25%). Under the premise of ensuring a small thickness, the mechanical properties of the cable can be improved under the coverage rate.

The structure of the copper tape layer and the polyester film layer is: a single copper tape is bonded with a polyester film on one side to form a copper-plastic composite wrapping tape; the wrapping rate of the copper-plastic composite wrapping tape ranges from (25%, 68%]. On the premise of ensuring a small thickness, the mechanical properties of the cable can be improved under the coverage rate.

The insulating cross-linked polyethylene material is required to pass the 40-year material life assessment. In the electrical cabinet, the heat is not dissipated smoothly, and the life of the insulating layer will be reduced compared with the normal environment. Therefore, the life of the insulating material is much more stringent.

The conductors are multi-stranded, and the pitch ratio of the strands is in the range of [14, 20). The conductor is multi-stranded and the pitch ratio requirement improves the flexibility of the cable.

The twisted aspect ratio range of the cable core composed of multiple wire cores is [22, 30). According to the experimental data, the bendability of the cable core can be optimized under the optimal aspect ratio.

In order to make the outer diameter of the cable as small as possible and the bending performance as good as possible, it can be laid in a narrow space and has a bending radius as small as possible. The insulating layer can achieve a small thickness in the process, and can achieve specific insulation requirements. Due to the reduction in the thickness of the insulating layer, in order to avoid the friction between the cores and damage the insulating layer during the bending process, a specific ratio of the number of inner and outer cores is adopted, and the twisting direction is opposite. The anti-electromagnetic interference requirements in the electrical cabinet are also very high. In this regard, under the aforementioned mechanical performance requirements, a very thin copper-plastic composite wrapping tape is used to achieve shielding. In consideration of the combination of the sheath layer and the insulating layer, the polyester film layer of the copper-plastic composite wrapping tape is placed on the outer layer, so that when the sheath material is extruded, the combination of the sheath material and the shielding layer is very good. When the cable is used, the displacement between the sheath layer and the shielding layer is avoided. The sheath layer is composed of extruded thermoplastic polyolefin materials. Under the premise of meeting the electrical and mechanical properties, its thickness range [1.44mm, 1.58mm] can meet the use requirements.

The cable proposed by this technical solution has both thin insulation and high electrical performance (1.0kV AC voltage is applied for 5 minutes during the withstand voltage test, and the insulation does not break down during the test), which is suitable for the narrow space of the electrical cabinet.

Description of drawings

Fig. 1 is a schematic diagram of the radial section structure of the cable in this embodiment.

In the figure: 1 conductor, 2 insulation layer, 3 wrapping layer, 4 copper tape layer, 5 polyester film layer, 6 sheath.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

The embodiment shown in Figure 1 is as follows:

A cable with thin insulation and high electrical performance for use in an electrical cabinet. Its structure is as follows: a conductor is wrapped with an insulating layer to form a core; Copper tape layer; the copper tape layer is wrapped with a polyester film layer; the polyester film layer is wrapped with a sheath layer;

In the cable core: the conductor is a copper wire with a cross-section of [0.5mm ² , 1.5mm ² ]; the insulating layer is made of extruded insulating cross-linked polyethylene material, and the thickness of the insulating layer is in the range of [0.3mm, 0.5mm mm]; the plurality of wire cores are divided into inner and outer layers, the number of inner layer wire cores: the number of outer layer wire cores is [1:1.5, 1:2.6]; the twisting directions of the inner and outer layer wire cores are opposite;

The wrapping layer is made of polyester wrapping tape, and the average thickness of the wrapping layer is [0.0180mm, 0.0485mm];

The copper tape layer is closely attached to the polyester film layer, and the average value of the total thickness of the copper tape layer and the polyester film layer is [0.556mm, 0.700mm];

The sheath layer is made of extruded thermoplastic polyolefin material, and the thickness range of the sheath layer is [1.44mm, 1.58mm]; it is preferably 1.5mm, and the range can be expanded to [1.44mm, 1.58mm] during production control. mm].

The twisting direction of the outer core is opposite to that of the wrapping layer; the wrapping direction of the wrapping layer is opposite to that of the shielding layer.

In this example: the conductor is a round solid annealed copper wire. The average thickness of the polyester wrapping tape is a covering rate of (15%, 25%]. The wrapping covering rate range of the copper-plastic composite wrapping tape is (25%, 68%]. The insulation The XLPE material is required to pass the 40-year material life assessment. The conductor adopts a multi-stranded mode, and the stranded pitch ratio is in the range of [14, 20). A plurality of wire cores are stranded to form a cable core The range of stranded aspect ratio is [22, 30).

The grade of insulating material is FPE2-01 cross-linked polyethylene insulating material, and the grade of sheathing material is HW461 cable sheathing material.

After testing, the performance of the cable in this example is as follows:

The structural size of the insulating layer: the thickness is 0.3 ~ 0.5mm;

Electrical properties:

1. The DC resistance of the conductor at 20°C complies with the regulations of IEC60228 or GB/T3956.

2. AC withstand voltage test: apply 1.0kV AC voltage for 5 minutes, and the insulation will not break down during the test. Mechanical behavior:

1. Mechanical properties before insulation aging: tensile strength ≥ 9.0Mpa, elongation at break ≥ 125%.

2. Mechanical properties after insulation aging (135±3°C, 7d): Tensile strength and elongation at break rate of change ≤±25%.

3. Mechanical properties of the sheath before aging: tensile strength ≥ 9.0Mpa, elongation at break ≥ 125%.

4. Mechanical properties of the sheath after aging (100±3°C, 7d): the change rate of tensile strength and elongation at break≤±40%.

5. Insulation heat extension: 200±3℃, 10min, 20N/cm ² conditions; the maximum elongation under load is not more than 175%, and the permanent elongation after cooling is not more than 15%.

Claims (7)

1. A thin-insulated high-electricity cable used in an electrical cabinet is characterized in that the structure is: the conductor is wrapped with an insulating layer to form a wire core; a plurality of wire cores are twisted to form a cable core; the cable core is wrapped with a wrapping layer; The cladding layer is wrapped with a copper tape layer; the copper tape layer is wrapped with a polyester film layer; the polyester film layer is wrapped with a sheath layer; In the cable core: the conductor is a copper wire with a cross-section of [0.5mm ² , 1.5mm ² ]; the insulating layer is made of extruded insulating cross-linked polyethylene material, and the thickness of the insulating layer is in the range of [0.3mm, 0.5mm mm]; the plurality of wire cores are divided into inner and outer layers, the number of inner layer wire cores: the number of outer layer wire cores is [1:1.5, 1:2.6]; the twisting directions of the inner and outer layer wire cores are opposite; The wrapping layer is made of polyester wrapping tape, and the average thickness of the wrapping layer is [0.0180mm, 0.0485mm]; The copper tape layer is closely attached to the polyester film layer, and the average value of the total thickness of the copper tape layer and the polyester film layer is [0.556mm, 0.700mm]; The sheath layer is made of extruded thermoplastic polyolefin material, and the thickness range of the sheath layer is [1.44mm, 1.58mm]; The twisting direction of the outer core is opposite to that of the wrapping layer; the wrapping direction of the wrapping layer is opposite to that of the shielding layer. 2. The thin-insulated high-electricity cable for use in an electrical cabinet according to claim 1, wherein the conductor is a round solid annealed copper wire. 3. The electric cable with thin insulation and high electrical performance in the electric cabinet according to claim 1, wherein the average thickness of the polyester wrapping tape is (15%, 25%]. 4. The thin-insulated high-electricity cable for use in an electrical cabinet according to claim 1, wherein the structure of the copper tape layer and the polyester film layer is: a single copper tape is bonded with a polyester film on one side , forming a copper-plastic composite wrapping tape; the wrapping rate range of the copper-plastic composite wrapping tape is (25%, 68%]. 5. The thin-insulated high-electricity cable for use in an electrical cabinet according to claim 1, characterized in that the insulating cross-linked polyethylene material is required to pass the 40-year material life assessment. 6. The thin-insulated high-electricity cable for use in an electrical cabinet according to claim 1, wherein the conductors are multi-stranded, and the pitch-to-diameter ratio of the strands is in the range of [14, 20). 7. The thin-insulated high-electricity cable for use in an electrical cabinet according to claim 1, characterized in that a plurality of wire cores are stranded to form a cable core, and the stranded pitch ratio range of the cable core is [22, 30).