De-icing wind-resistant double-insulated overhead power transmission cable
The de-icing and wind-resistant double-insulated overhead transmission cable, which combines steel wire tension elements and insulation layers, solves the problem of cable icing in low-temperature freezing weather, achieves efficient de-icing and wind resistance, reduces the risk of cable damage, and improves the efficiency of power grid operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENGYANG HENGFEI CABLE CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-06-12
AI Technical Summary
In low-temperature and freezing weather, elevated power transmission cables are susceptible to problems such as excessive mechanical load, deterioration of electrical performance, and conductor galloping. Existing de-icing methods are inefficient and costly, affecting the safety and efficiency of the power grid.
The cable employs a combined structure consisting of a steel wire tension element, an inner insulation layer, an aluminum alloy conductor layer, and an outer insulation layer. The steel wire tension element generates heat through induction, and the radiant heat from the inner and outer insulation layers melts the ice. The outer insulation layer is designed with a duct structure to reduce wind resistance and minimize cable swaying.
It achieves efficient de-icing and wind resistance, reduces the possibility of icing, reduces the risk of cable damage, improves power grid operation efficiency, has low cost, and has value for widespread application.
Smart Images
Figure CN224355024U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cable technology, and in particular to a de-icing and wind-resistant double-insulated overhead power transmission cable. Background Technology
[0002] Currently, the hazards of low-temperature freezing weather to overhead power transmission cables are mainly manifested in the following three aspects:
[0003] I. Structural damage caused by excessive mechanical load
[0004] Icing increases the added mass and wind pressure area, causing the mechanical load to far exceed the design threshold. When the ice thickness exceeds the conductor's anti-icing capacity, it may cause problems such as wire breakage, hardware damage, and tower breakage. In severe cases, it may even lead to the collapse of the tower. The difference in ice thickness between adjacent lines or different sections of the same line will create a tension difference, leading to mechanical damage such as conductor breakage, insulator rupture, and tower crossarm deformation. During the de-icing process, the sudden detachment of the ice layer may cause violent vibration of the conductor, exacerbating the risk of fatigue fracture of the connecting components.
[0005] II. Electrical performance degradation and safety risks
[0006] Ice accumulation can be considered a special type of contamination. When the ice melts, it forms a conductive channel, causing distortion of the electric field on the surface of the insulator and inducing flashover discharge. In low-temperature environments, the flexibility of the cable's outer sheath and insulation layer decreases, making them prone to brittleness or deformation, accelerating sealing failure and insulation performance degradation. Low-temperature shrinkage of the cable may cause loosening of the internal structure, and expansion when heated leads to stress concentration, increasing the risk of breakage.
[0007] III. Dynamic Risks Caused by Conductor Galloping and Phase Flashover
[0008] When the ice thickness on the windward and leeward sides of a conductor is uneven, it can easily form an aerodynamically unstable structure, causing the conductor to gallop at low frequency and large amplitude. Such galloping may cause phase-to-phase flashover, hardware detachment, and wire breakage accidents. Split conductors are more susceptible to the impact because they have a larger windward area.
[0009] In summary, during periods of low temperatures and freezing weather, supercooled water droplets rapidly freeze on the surface of power lines, forming a hard ice layer that can cause severe icing within a short period. Such disasters are often accompanied by the combined effects of strong winds and low temperatures, accelerating the failure process of power lines, severely impacting the safety and efficiency of power grid operations, and resulting in significant indirect economic losses. Currently, the de-icing methods used in power grids are inefficient and costly, hindering the development of this industry. Summary of the Invention
[0010] This utility model addresses the problems mentioned in the background art by providing a de-icing and wind-resistant double-insulated overhead power transmission cable with a simple structure, relatively low cost, and good de-icing and wind-resistant effect.
[0011] To achieve the above objectives, the present invention adopts the following technical solution:
[0012] An ice-removing and wind-resistant double-insulated overhead power transmission cable is characterized by comprising a steel wire tension element, an inner insulation layer, an aluminum alloy conductor layer, and an outer insulation layer;
[0013] The aforementioned steel wire tension element is made of several galvanized high-strength steel wires twisted together, and is used to bear all tensions including the weight of the overhead line itself, rain, snow, ice load and wind force;
[0014] The inner insulation layer is extruded over the steel wire tension element, and the inner insulation layer is an insulating material with a thermal conductivity greater than 0.3.
[0015] The aluminum alloy conductor layer consists of several aluminum alloy wires, which are evenly and tightly distributed spirally wound on the outer surface of the inner insulation layer. The aluminum alloy wire material is 6000 series aluminum alloy.
[0016] The outer insulation layer is made of cross-linked polyethylene material and is uniformly extruded onto the outer surface of the aluminum alloy conductor layer.
[0017] A further solution is that the outer insulation layer has several triangular grooves evenly distributed at equal intervals on its circumferential surface, which can reduce the axial wind resistance of the cable in windy weather and reduce the excessive swing amplitude caused by the resonance between the cable and the airflow, thus preventing damage to the line.
[0018] A further option is that the steel wire tension element preferably has 7 steel wires, each with an elastic modulus greater than 105 GPa and a linear expansion coefficient of 15.3 × 10⁻⁶ / ℃.
[0019] A further option is that the thickness of the inner insulation layer is preferably 0.4 mm.
[0020] A further option is that the thickness of the outer insulation layer is preferably 3.4 mm.
[0021] The working principle of this utility model is as follows: the steel wire tension element passes through the aluminum alloy conductor layer, and the steel wire tension element generates heat through induction. The heat is radiated to the cable surface through the inner insulation layer, the aluminum alloy conductor layer and the outer insulation layer, which have a certain thermal conductivity. It can continuously generate heat to melt the ice on the cable surface. The inner insulation layer separates the aluminum alloy conductor layer and the steel wire reinforcement element to ensure that electrochemical corrosion between different metals will not occur.
[0022] The beneficial effects of this utility model are: it can heat the cable surface in real time, greatly reducing the possibility of ice formation on the cable surface in low-temperature freezing weather, reducing the harm of cable ice, and at the same time, the surface is designed with a wind channel structure to reduce the combined harm of ice and strong wind. It has high de-icing efficiency, which is more efficient and lower in cost than other de-icing methods, which is conducive to the development of the industry and improves the operating efficiency of the power grid. It has the value of promotion and utilization. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Detailed Implementation
[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Example
[0025] like Figure 1 As shown, an ice-removing and wind-resistant double-insulated overhead power transmission cable includes a steel wire tension element 1, an inner insulation layer 2, an aluminum alloy conductor layer 3, and an outer insulation layer 4.
[0026] The steel wire tension element 1 is made of several galvanized high-strength steel wires twisted together, and is used to bear all tensions including the weight of the overhead line itself, rain, snow, ice load and wind force;
[0027] The inner insulation layer 2 is extruded around the steel wire tension element 1, and the inner insulation layer 2 is an insulating material with a thermal conductivity greater than 0.3.
[0028] The aluminum alloy conductor layer 3 consists of several aluminum alloy wires, which are evenly and tightly distributed spirally wound on the outer surface of the inner insulation layer 2. The aluminum alloy wire material is 6000 series aluminum alloy.
[0029] The outer insulation layer 4 is made of cross-linked polyethylene material and is uniformly extruded onto the outer surface of the aluminum alloy conductor layer 3.
[0030] The outer insulation layer 4 has several triangular grooves 41 evenly distributed on its circumferential surface. These grooves can reduce the axial wind resistance of the cable in windy weather and reduce the excessive swaying amplitude caused by resonance between the cable and the airflow, which could damage the line.
[0031] The steel wire tension element 1 preferably has 7 steel wires, each with an elastic modulus greater than 105 GPa and a linear expansion coefficient of 15.3 × 10⁻⁶ / ℃.
[0032] The thickness of the inner insulation layer 2 is preferably 0.4 mm.
[0033] The thickness of the outer insulation layer 4 is preferably 3.4 mm.
Claims
1. A de-icing and wind-resistant double-insulated overhead transmission cable, characterized in that: Includes steel wire tensile elements, inner insulation layer, aluminum alloy conductor layer, and outer insulation layer; The aforementioned steel wire tension element is made of several galvanized high-strength steel wires twisted together, and is used to bear all tensions including the weight of the overhead line itself, rain, snow, ice load and wind force; The inner insulation layer is extruded over the steel wire tension element, and the inner insulation layer is an insulating material with a thermal conductivity greater than 0.
3. The aluminum alloy conductor layer consists of several aluminum alloy wires, which are evenly and tightly distributed spirally wound on the outer surface of the inner insulation layer. The aluminum alloy wire material is 6000 series aluminum alloy. The outer insulation layer is made of cross-linked polyethylene material and is uniformly extruded onto the outer surface of the aluminum alloy conductor layer.
2. The de-icing and wind-resistant double-insulated overhead transmission cable as described in claim 1, characterized in that... The outer insulating layer has several triangular grooves evenly distributed at equal intervals on its circumferential surface.
3. A de-icing and wind-resistant double-insulated overhead transmission cable as described in claim 1 or 2, characterized in that... The steel wire anti-tension element preferably has 7 steel wires, each with an elastic modulus greater than 105 GPa and a linear expansion coefficient of 15.3 × 10⁻⁶ / ℃.
4. A de-icing and wind-resistant double-insulated overhead transmission cable as described in claim 1 or 2, characterized in that... The thickness of the inner insulation layer is preferably 0.4 mm.
5. The de-icing and wind-resistant double-insulated overhead transmission cable as described in claim 3, characterized in that... The thickness of the inner insulation layer is preferably 0.4 mm.
6. A de-icing and wind-resistant double-insulated overhead transmission cable as described in claim 1, 2, or 5, characterized in that... The thickness of the outer insulation layer is preferably 3.4 mm.
7. The de-icing and wind-resistant double-insulated overhead transmission cable as described in claim 3, characterized in that... The thickness of the outer insulation layer is preferably 3.4 mm.
8. The de-icing and wind-resistant double-insulated overhead transmission cable as described in claim 4, characterized in that... The thickness of the outer insulation layer is preferably 3.4 mm.