WO2019095703A1

WO2019095703A1 - Composite cable for variable frequency propulsion system for ships and offshore platforms

Info

Publication number: WO2019095703A1
Application number: PCT/CN2018/094546
Authority: WO
Inventors: 王志荣; 王红伟; 巨国强; 田进鑫; 康冬冬
Original assignee: 中天科技装备电缆有限公司
Priority date: 2017-11-16
Filing date: 2018-07-04
Publication date: 2019-05-23
Also published as: CN107887071A

Abstract

Disclosed is a composite cable for a variable frequency propulsion system for ships and offshore platforms, comprising multiple cores, an optical cable (5), a composite water-resistant structure, a shielding armor layer, a fire-barrier layer (12) and an outer sheath (13), wherein the multiple cores comprise a main insulation core (1) and a neutral core (2); a crosslinked polyethylene insulation layer (21) is extruded outside the neutral core (2); a composite insulation layer and a woven metal shielding layer (44) are successively wrapped around the main insulation core (1); a gap between the main insulation core (1) and the neutral core (2) is internally provided with the optical cable (5) and a flame-retardant PP rope (6); the composite water-resistant structure comprises water-resistant grease (7) and a water-resistant wrapping belt (8); the water-resistant wrapping belt (8) is wrapped around the shielding armor layer, the fire-barrier layer (12) and the outer sheath (13) in sequence. The composite cable for the variable frequency propulsion system can enhance a signal monitoring function and is free from electromagnetic interference, and has a better tolerance against variable frequency high-order harmonic voltage impacts. The multi-layer shielding system can better resist external and its own signal interference, and has a better performance in terms of tension, water and moisture resistance, and high and low temperature resistance.

Description

Composite cable for variable frequency propulsion system for ships and offshore platforms

Technical field

The invention relates to a cable, in particular to a composite cable for a frequency conversion propulsion system for a ship and a marine platform.

Background technique

With the energy-saving development of the marine and offshore industries, the variable frequency AC drive is widely used in fans, winches, main propellers, rudder propeller drives and various special operating conditions. The development of frequency control transmission technology for marine equipment has higher requirements for frequency variable transmission systems, especially for modern inverter technology using IGBT semiconductors with fast switching. Although the pulse frequency is high or the time is only within milliseconds, they will The magnetic field generated by the surrounding environment is to maintain the normal operation of the inverter and is not affected by the electromagnetic field. The cable between the inverter and the three-phase AC motor is required to have anti-interference performance, low effective capacitance and low transmission impedance. With the marine ship and offshore industry inverter market annual growth rate of up to 20% to 30%. Therefore, the demand for cables for variable frequency propulsion systems will also increase.

The reliability of marine and offshore equipment is a critical issue. Vibration, humidity and salt can cause damage to the mechanical and electrical components of marine equipment. In order to ensure trouble-free operation of marine equipment, system components and materials need to be selected according to special requirements. Cable products for marine variable frequency propulsion systems must meet the requirements for load capacity, shock resistance, acid and alkali resistance, low smoke and halogen free and flame retardant performance, especially to adapt to harmonic generation, high harmonic accumulation and electromagnetic interference of frequency conversion system. , reflected wave voltage and induced voltage of adjacent cables.

Summary of the invention

The technical problem to be solved by the invention is to provide a composite cable for a frequency conversion propulsion system for a ship and a marine platform, so that the cable has a signal transmission function free from electromagnetic interference and adapts to the environment near the frequency conversion propulsion system, and is a good one. Composite cable for light propulsion systems with water resistance, mud resistance, flame retardancy, fire resistance, high and low temperature resistance, and anti-interference performance.

In order to solve the above technical problems, the present invention adopts the following technical solutions: a composite cable for a variable frequency propulsion system for ships and offshore platforms, including a plurality of cores, optical cables, composite water blocking structures, shielded armor layers, fire barriers and external protection The plurality of cores includes a main insulated core and a neutral core;

The main insulated core and the neutral core are both made of an annealed tinned copper stranded soft conductor; the neutral core is extruded with a crosslinked polyethylene insulation layer; the main insulated core is outside the core Wrapping the composite insulating layer and the metal braided shield layer in turn;

An optical cable and a flame-retardant PP rope are disposed in a gap between the main insulated core and the neutral core;

The composite water blocking structure comprises a water blocking grease filled in a gap between a main insulated core, a neutral core, a cable and a flame retardant PP rope, and a water blocking tape wrapped around the core;

The water-blocking bag is wrapped around the package to shield the armor layer, the fire barrier layer and the outer sheath.

Further, the plurality of cores includes three main insulated cores and three neutral cores; the three main insulated cores are arranged in a triangular shape and three main insulated cores are tangent; The core is distributed on the outer side of the three main insulated cores, each of which is tangent to the two adjacent main insulated cores; the gap between the neutral core and the main insulated cores on both sides Cable and flame retardant PP rope are installed inside.

Further, the composite insulating layer comprises a semiconducting tape wrapped by a conductor, a semiconducting material conductor shielding layer, a crosslinked polyethylene insulation and a semiconductive material insulating shielding layer from the inside to the outside, and the composite insulating layer adopts three layers. The squeezed equipment is packed.

Further, the shield armor layer is a shield armor layer woven from a drain wire, a copper strip and nickel-plated carbon fiber.

Further, the fire barrier layer is wrapped by a ceramized silicone rubber tape, and the coverage ratio of the ceramized silicone rubber wrapped fire barrier layer is 15 to 25%.

Further, the outer sheath is made of a low-smoke, halogen-free flame-retardant cross-linked polyolefin sheathing material, which is resistant to -40 ° C at a low temperature and 125 ° C at a high temperature.

Further, the optical cable is a single-mode or multi-mode optical cable that passes through the protective sleeve in advance, and can transmit signals such as temperature detection, humidity detection, frequency feedback, and equipment running state without electromagnetic interference of the variable-frequency propulsion system, and monitor the frequency conversion system in real time. Operation.

Further, the metal braided shielding layer has a braid coverage density of ≥ 88%.

The invention has the beneficial effects that the composite cable for the variable frequency propulsion system for the marine and offshore platforms of the invention enhances the signal transmission function of the frequency conversion propulsion system such as temperature detection, humidity detection, frequency feedback, equipment operation state, and is not electromagnetic Interference; can withstand the propulsion system to produce superimposed high-order harmonic voltage, metal braiding outside the insulation can play a certain shielding effect; excellent waterproof performance in the ship's wet variable frequency propulsion system environment; ceramic silicon rubber wrapping tape The self-sealing property of fire makes it an excellent refractory layer structure under fire; the "3+3" symmetrical structure and the drain wire + copper strip + nickel-plated carbon fiber braided armor structure have good anti-interference ability and excellent mechanical properties. And it can further reduce the weight of the composite cable, and it is suitable for the complex environment of the cabin with small space and frequent bending and vibration. It is flame retardant, refractory and has high temperature resistance. It is also resistant to mud, oil, abrasion and electrical insulation and excellent mechanical properties.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments described in the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

Figure 1 is a schematic view of the structure of the present invention.

2 is a schematic view showing the structure of a neutral core.

Figure 3 is a schematic view showing the structure of a main insulated core.

Detailed ways

The technical solutions of the present invention will be clearly and completely described by way of specific embodiments.

The composite cable for the variable frequency propulsion system for marine and offshore platforms of the present invention comprises a plurality of cores, optical cables, composite water blocking structures, shield armor layers, fire barrier layers and outer jackets.

As shown in FIG. 1-3, the composite cable for the variable frequency propulsion system for marine and offshore platforms of the present invention comprises three main insulated cores, three neutral cores 2, optical cables 5, composite water blocking structures, and shielded armor layers. , the fire barrier layer 12 and the outer sheath 13 .

The main insulated core 1 and the neutral core 2 are each composed of an annealed tinned copper stranded soft conductor; the neutral core 2 is extruded with a crosslinked polyethylene insulating layer 21; The insulated core 1 is wrapped around the composite insulating layer 4 and the metal braided shield layer 44 in turn;

According to the provisions of IEC60228-2004 and in combination with the actual situation, select a class 5 or class 6 soft conductor, and determine the number of individual filaments, the arrangement structure. The three main insulated cores 1 are arranged in a triangular shape and three main insulated cores are tangent; the three neutral cores 2 are distributed outside the three main insulated cores, and each neutral core 2 Both are tangent to two adjacent main insulated cores 1.

The composite insulating layer 4 includes a semiconducting tape 41 wrapped by a conductor, a semiconducting material conductor shielding layer 42, a crosslinked polyethylene insulating and a semiconductive material insulating shielding layer 43 in order from the inside to the outside, and the composite insulating layer 4 is three. The layer coextrusion equipment is extruded. The outer semi-conducting tape wrapped around the main insulation core ensures the smoothness of the shielding material when it is in contact. The three-layer co-extrusion and the extrusion of the conductor shielding, insulation and insulation shielding can not only ensure the bonding strength, but also ensure the smoothness and reduce the semi-conductivity. The protrusions of the layer reduce the local electrical stress and can withstand three times the peak voltage caused by the superposition of higher harmonics. The main wire core outer metal braided shield adopts an annealed tinned copper soft conductor, and the braiding coverage density is not less than 88%. The neutral core is extruded with cross-linked polyethylene insulation, and the total cross section of the neutral line is not less than half of the main core. The 3+3E structure forms a state of symmetrical equilibrium, so that the current components do not form a superposition, thereby effectively reducing the adverse effects of higher harmonics on the variable frequency cable.

The gap between the main insulated core 1 and the neutral core 2 is filled with the optical cable 5 and the flame-retardant PP rope. The composite water blocking structure comprises a water blocking grease 7 filled in the gap between the main insulated core 1, the neutral core 2, the optical cable 5 and the flame-retardant PP rope 6, and a water blocking package wrapped around the core With 8.

The optical cable 5 is an optical cable that passes through the protective cover in advance, and the number of the optical cables is three or six. The number of optical fibers in the optical cable can be confirmed according to specific design requirements. The number of cores and the modulus of the fiber optic cable can be confirmed according to specific design requirements. The optical cable can transmit the temperature detection, humidity detection, frequency feedback, equipment running status and other signals without electromagnetic interference from the variable frequency propulsion system, and monitor the operation of the frequency conversion system in real time without increasing the outer diameter of the cable.

Appropriately filled with flame-retardant PP rope to ensure the roundness of the cable and mitigate the external impact on the cable. The remaining gap is filled with 7-water-blocking grease, and the outer layer is wrapped with 8-water-blocking tape to form a tight composite water-blocking The structure ensures that the composite cable has excellent water blocking performance in the environment of the wet variable frequency propulsion system.

The water blocking tape 8 is wrapped around the armor layer, the fire barrier layer 12 and the outer sheath 13 in turn.

The shield armor layer is a shield armor layer woven from the drain wire 9, the copper strip 10 and the nickel-plated carbon fiber 11. The drain wire is an annealed tinned copper soft conductor, so that the copper strip shield layer maintains continuity and can conduct accumulated charge, short circuit current, and leakage current to facilitate connection of the ground wire. The nickel-plated carbon fiber has a density of about 2.4 g/cm ³ , and the strength is far superior to that of the tin-plated copper wire under the same specification, the woven cover density is not less than 88%, and the control shielding effect reaches 100%. The shield structure is more stable and reliable, and the overall weight can be reduced by about 15%.

The fire barrier layer 12 is wrapped by a ceramized silicone rubber tape, and the coverage ratio of the ceramicized silicone rubber wrapping tape is 15 to 25%. In the case of fire, it is automatically closed and becomes an effective refractory structure, ensuring continuous power supply for more than 90 minutes in a large fire.

The outer sheath 13 is made of a low-smoke, halogen-free flame-retardant cross-linked polyolefin sheathing material, which is resistant to -40 ° C at a low temperature and 125 ° C at a high temperature. Its flame retardant, fireproof and high temperature resistance are outstanding. It also has mud resistance, oil resistance, wear resistance and electrical insulation and excellent mechanical properties. It effectively ensures the use of the variable frequency propulsion system to withstand long-term high temperature environment.

The composite cable of the present invention can be fire-resistant according to the test conditions described in IEC 60331-1/2, and is continuously fired for 90 minutes at a flame temperature of 830 ° C. The power supply of the cable is normal for 15 minutes after the fire is removed, and the cable is not broken.

The embodiments described above are only described in the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. The technical solutions of the present invention will be made by those skilled in the art without departing from the inventive concept. Various modifications and improvements are intended to be included within the scope of the present invention. The claimed technical content of the present invention is fully described in the claims.

Claims

The utility model relates to a composite cable for a frequency conversion propulsion system for a ship and a marine platform, comprising a plurality of cores, an optical cable (5), a composite water blocking structure, a shielding armor layer, a fire barrier layer (12) and an outer sheath (13), Characterizing that the plurality of wire cores comprise a main insulated core (1) and a neutral core (2);

The main insulated core (1) and the neutral core (2) are both made of an annealed tinned copper stranded soft conductor; the neutral core (2) is extruded with a crosslinked polyethylene insulation layer. (21); the main insulated core (1) is wrapped around the composite insulating layer (4) and the metal braided shield layer (44); the main insulated core (1) and the neutral core (2) a cable (5) and a flame retardant PP rope (6) are disposed in the gap;

The composite water blocking structure comprises a water blocking grease (7) filled in a gap between the main insulated core (1), the neutral core (2), the optical cable (5) and the flame-retardant PP rope (6), and a water blocking tape (8) wrapped around the core of the cable;

The water blocking tape (8) is wrapped around the armor layer, the fire barrier layer (12) and the outer sheath (13).
The composite cable for a variable frequency propulsion system for a ship and a marine platform according to claim 1, wherein the plurality of cores comprises three main insulated cores (1) and three neutral cores (2); The three main insulated cores (1) are arranged in a triangular shape and three main insulated cores are tangent; the three neutral cores (2) are distributed outside the three main insulated cores, each of which The cores (2) are tangent to the two adjacent main insulated cores (1); the optical cable is disposed in the gap between the neutral core (2) and the main insulated cores (1) on both sides thereof (5) ) and flame retardant PP rope (6).
The composite cable for a variable frequency propulsion system for a ship and a marine platform according to claim 1, wherein the composite insulating layer (4) comprises a semiconducting tape (41) surrounded by a conductor in order from the inside to the outside. The semi-conductive material conductor shielding layer (42), the cross-linked polyethylene insulation and the semi-conductive material insulating shielding layer (43), and the composite insulating layer (4) are extruded by a three-layer co-extrusion device.
The composite cable for a variable frequency propulsion system for a ship and a marine platform according to claim 1, wherein the shield armor layer is composed of a drain wire (9), a copper strip (10), and a nickel-plated carbon fiber (11). Braided.
The composite cable for a variable frequency propulsion system for a ship and a marine platform according to claim 1, wherein the fire barrier layer (12) is wrapped by a ceramized silicone rubber tape, and the ceramic silicon rubber rubber is wrapped. The coverage rate of the fire barrier layer is 15 to 25%.
The composite cable for a variable frequency propulsion system for a ship and a marine platform according to claim 1, wherein the outer sheath (13) is made of a low-smoke, halogen-free flame-retardant radiation-crosslinked polyolefin sheathing material. Low temperature tolerance -40 ° C, high temperature tolerance of 125 ° C.
The composite cable for a variable frequency propulsion system for a ship and a marine platform according to claim 1, wherein the optical cable (5) is a single-mode or multi-mode optical cable that passes through a protective cover in advance, and is capable of detecting temperature, The signals such as humidity detection, frequency feedback, and equipment running status are not transmitted by the electromagnetic interference of the variable frequency propulsion system, and the operation of the frequency conversion system is monitored in real time.
The composite cable for a variable frequency propulsion system for a ship and a marine platform according to claim 1, wherein the metal braided shielding layer has a braiding coverage density of ≥ 88%.