CN205302978U - Strengthen resistance to compression type wind energy cable - Google Patents

Abstract

The utility model discloses a reinforced anti-pressure wind energy cable, which comprises a cable core, the cable core is composed of three power cores juxtaposed in a triangle, a ground core and two reinforcement cores located in the gap between the three power cores Twisted; the gap of the cable core is provided with a filling layer, and the outside of the cable core is sequentially extruded with a halogen-free flame-retardant tape, an inner sheath, and an outer sheath; there is also a metal pressure-resistant tube between the inner and outer sheaths ;The cable has low temperature resistance, frequent torsion resistance, salt spray resistance, and drag resistance in the harsh wind farm environment, and keeps the cable smoothly transmitting power to meet the normal operation of wind power equipment, and has good pressure resistance, moisture resistance and sealing , small attenuation, good shielding effect.

Description

A reinforced anti-compression wind power cable

technical field

The utility model belongs to the field of power cables, in particular to a reinforced anti-pressure wind energy cable.

Background technique

Among the many renewable energy sources, wind power generation is currently the fastest growing and most economically applicable. Wind power generation is safe, clean, and rich in resources. Wind energy is inexhaustible and inexhaustible. It is an everlasting renewable resource.

Wind energy cables generally have the characteristics of excellent torsion resistance. At the same time, wind energy cables generally require cables to have good low temperature resistance, salt spray resistance, and drag resistance, so as to ensure that the cables are in the harsh environment of severe cold inland and offshore salt spray corrosion. use. However, for rated voltage 26/35kV and below low temperature medium voltage wind energy cables, it is far from enough to only consider the performance requirements of the cable such as torsion resistance, low temperature resistance, and salt spray resistance. Reasonable metal shielding structure and ground wire structure design, It is also a guarantee to ensure the safe operation of the cable.

From the perspective of ensuring that the operation safety requirements of large-capacity wind turbines are met, it is particularly necessary to develop a halogen-free flame-retardant low-temperature resistant medium-voltage wind energy cable to gradually meet the requirements of the development trend of large-scale wind turbines. 26/35kV and below low-temperature resistant medium-voltage wind energy cable conductors and insulation shielding layer materials, research on insulating layer materials, as well as the design of cable metal shielding structure and ground wire structure are the key to halogen-free flame-retardant low-temperature resistant medium-voltage wind energy cables; In addition, the current cable core is prone to bending and breaking, and has poor compressive performance, poor moisture resistance and sealing performance, and even worse bendability.

Utility model content

The technical problem to be solved by the purpose of this utility model is to provide a reinforced anti-pressure wind energy cable, which has the characteristics of low temperature resistance, frequent torsion resistance, salt spray resistance, and drag resistance in the harsh wind farm environment, and keeps the cable smooth. Power transmission meets the normal operation of wind power equipment, and has good pressure resistance, moisture resistance and sealing performance, small attenuation, and good shielding effect.

A reinforced anti-compression wind energy cable described in the utility model includes a cable core, and the cable core is composed of three power cores juxtaposed in a triangle and a ground core and two reinforcement cores located in the gap between the three power cores. The cable core is stranded; the gap of the cable core is provided with a filling layer, and the outside of the cable core is sequentially extruded with a halogen-free flame-retardant tape, an inner sheath, and an outer sheath; there is also a metal compression resistance between the inner and outer sheaths. tube; the power line core is composed of a power line conductor and a conductor shielding semiconducting layer, an isolation tape, an insulating shielding layer, a semiconducting wrapping layer and a metal shielding layer extruded sequentially outside the conductor; the ground wire The core is composed of a ground wire conductor and a semiconductive layer extruded outside the ground wire conductor; the reinforcing core is composed of a central load-bearing core and a buffer layer extruded outside the central load-bearing core.

As a further improvement, the metal pressure-resistant pipe is a rigid pressure-resistant pipe wrapped or longitudinally wrapped, specifically a corrugated pipe, so that the cable has high mechanical strength, good compression resistance, good moisture-proof and sealing performance, and the corrugation can improve its bending properties.

As a further improvement, the conductor shielding semiconducting layer is a cross-linked halogen-free semiconducting shielding layer based on EPDM.

As a further improvement, the isolation strip is a cross-linked medium-voltage ethylene-propylene insulating rubber based on EPDM.

As a further improvement, the insulating shielding layer is a strippable cross-linked halogen-free semi-conductive shielding layer based on vinyl acetate copolymer and nitrile rubber.

As a further improvement, the metal shielding layer is braided shielding of tinned copper wires.

As a further improvement, the outer sheath is made of halogen-free, low-smoke, UV-resistant thermosetting elastomer material.

The beneficial effects of the utility model are:

1. The cable insulation core adopts three-layer co-extrusion of halogen-free conductor shielding rubber, ethylene-propylene insulating rubber of 35kV and below, and halogen-free semi-conductive cross-linkable and peelable insulating shielding rubber; the developed halogen-free conductor shielding rubber, halogen-free Semi-conductive cross-linkable and peelable insulating shielding rubber with volume resistivity ≤ 100Ω·cm, halogen-free performance: PH value ≥ 4.3, conductivity weighted value ≤ 10μs/mm; rated voltage lower than 35kV, halogen-free, flame retardant, low temperature and medium voltage The maximum dielectric loss tanδ (95～100℃) of the ethylene-propylene insulating rubber of the wind energy cable is 400×10 ⁴ , and the minimum volume resistivity is 10 ¹⁶ Ω·cm; the rated voltage is 35kV halogen-free flame-retardant low-temperature medium-voltage wind energy cable The maximum dielectric loss tanδ (95～100℃) of the ethylene-propylene insulating rubber is 50×10 ⁴ , and the minimum volume resistivity is 10 ¹⁶ Ω·cm. Therefore, it can ensure that the partial discharge level of the cable is excellent, the discharge capacity is ≤5Pc, and the insulation resistance performance is excellent;

2. Each power core of the utility model adopts a tinned copper wire weaving structure, which can effectively suppress and suppress electromagnetic waves from being emitted to the outside, and reduce interference to equipment;

3. The utility model places the ground wire in the gap of the cable core, which not only plays the role of conducting the fault current, but also plays the role of balancing the electric field, so as to ensure the safe operation of the cable;

4. The utility model is equipped with a reinforcing core in the cable, which strengthens the anti-torsion ability of the cable, and makes the cable not easy to break, and is not easy to produce broken cores; the center of the reinforcing core is provided with a central bearing core, and the stress point of the inner conductor is concentrated. On the central bearing core, the annealed copper wire of the inner conductor is protected during the winding process of the cable, and it is not easy to break;

5. There is also a metal anti-pressure tube between the inner and outer sheaths, which makes the cable have high mechanical strength, good compression performance, moisture-proof and sealing performance, and embossing can improve its bending performance.

Description of drawings

Fig. 1 is a structural representation of the utility model.

detailed description

As shown in Figure 1, a reinforced anti-compression wind energy cable described in the utility model includes a cable core, and the cable core is composed of three power cores juxtaposed in a triangle and a ground wire located in the gap between the three power cores. The wire core and two reinforcing cores are stranded; the gap of the cable core is provided with a filling layer 7, and the outside of the cable core is sequentially extruded with a halogen-free flame-retardant tape 8, an inner sheath 9, and an outer sheath 11; There is also a metal pressure-resistant tube 10 between the sheaths 9 and 11; the power line core is composed of the power line conductor 1 and the conductor shielding semi-conductive layer 2, isolation tape 3, and insulation shielding that are sequentially extruded outside the conductor 1. layer 4, a semiconductive wrapping layer 5 and a metal shielding layer 6; the ground core is composed of a ground conductor 12 and a semiconductive layer 13 extruded outside the ground conductor 12; the reinforcing core is composed of a central The bearing core 14 and the buffer layer 15 extruded outside the central bearing core 14 are formed.

The metal pressure-resistant pipe 10 is a hard pressure-resistant pipe wrapped around or longitudinally, specifically a corrugated pipe, so that the cable has high mechanical strength, good compressive performance, moisture-proof and sealing performance, and corrugated can improve its performance. bending properties.

The conductor shielding semiconducting layer is a cross-linked halogen-free semiconducting shielding layer based on EPDM, the volume resistivity of the conductor shielding layer and the insulating shielding layer is ≤100Ω·cm, and the halogen-free performance: PH value≥ 4.3, the weighted value of conductivity ≤ 10μs/mm; the insulating layer is a cross-linked medium-voltage ethylene-propylene insulating rubber based on EPDM, and the rated voltage is lower than 35kV. The dielectric loss tanδ (95-100°C) of the ethylene-propylene insulating rubber of the cable has a maximum value of 400×104; the dielectric loss tanδ (95-100°C) of the ethylene-propylene insulating rubber of the rated voltage 35kV ) maximum value is 50×104, and the minimum volume resistivity value is 1016Ω·cm; the insulating shielding layer is a strippable cross-linked halogen-free semi-conductive shielding layer based on vinyl acetate copolymer and nitrile rubber; The metal shielding layer is braided shielding of tinned copper wires; the reinforcing layer is braided by dipped polyester cord, and the breaking strength of the dipped polyester cord is >1070N.

The above is only the preferred implementation method of the utility model, and it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements can also be made, and these improvements should also be regarded as Protection scope of the present utility model.

Claims (6)

1. A reinforced anti-compression wind energy cable, characterized in that: it includes a cable core, and its cable core is composed of three power cores juxtaposed in a triangle and a ground core and two reinforcement cores positioned in the gap between the three power cores. The core is stranded; the gap of the cable core is provided with a filling layer (7), and the outside of the cable core is extruded with a halogen-free flame-retardant tape (8), an inner sheath (9), and an outer sheath (11); 1. There is also a metal pressure-resistant tube (10) between the outer sheaths (9, 11); the power line core is composed of the power line conductor (1) and the conductor shielding semi-conductor extruded sequentially outside the conductor (1). Conductive layer (2), isolation tape (3), insulating shielding layer (4), semi-conductive wrapping layer (5) and metal shielding layer (6); the ground wire core is composed of ground wire conductor (12) and The semi-conductive layer (13) is extruded outside the ground wire conductor (12); the reinforcing core is composed of a central bearing core (14) and a buffer layer (15) extruded outside the central bearing core (14). 2. The reinforced anti-compression wind energy cable according to claim 1, characterized in that, the metal anti-pressure pipe (10) is a hard anti-pressure pipe wrapped around or longitudinally. 3. The reinforced anti-pressure wind power cable according to claim 1, characterized in that the conductor shielding semiconductive layer (2) is a cross-linked halogen-free semiconductive shielding layer based on EPDM. 4. The reinforced anti-compression wind power cable according to claim 1, characterized in that the isolation strip (3) is a cross-linked medium-voltage ethylene-propylene insulating rubber based on EPDM. 5. The reinforced anti-pressure wind energy cable according to claim 1, characterized in that, the insulating shielding layer (4) is a strippable cross-linked halogen-free semi-conductive cable based on vinyl acetate copolymer and nitrile rubber. Conductive shielding. 6. The reinforced anti-compression wind energy cable according to claim 1, characterized in that, the metal shielding layer (6) is braided shielding of tinned copper wires.