Comprehensive High-Performance Fire-Resistant and Flame-Retardant High-Voltage Cable Solution

1. Technical Background and Demand Analysis​
   High-voltage cables (typically referring to cables transmitting 1kV–1000kV electrical power) serve as the core arteries of power systems and are widely used in critical scenarios such as urban power grids, power stations, industrial and mining enterprises, and cross-water power transmission. Traditional high-voltage cables exhibit several shortcomings during long-term operation:

• ​Inadequate shielding performance: Susceptible to external electromagnetic interference, and the electromagnetic fields they generate may lead to high-voltage hazards and electrostatic accumulation, posing safety risks.
• ​Weak fire resistance and flame retardancy: The insulation materials have poor high-temperature resistance, making them prone to becoming ignition sources during faults and accelerating flame spread, thereby expanding the scope of accidents.
• ​Limited comprehensive protection: Insufficient design in waterproofing, corrosion resistance, wear resistance, and shock absorption/noise reduction makes them ill-suited for complex and harsh operating environments, affecting service life and operational stability.

To address these common industry challenges, our company introduces an innovative high-performance high-voltage cable solution that integrates multiple protective functions.

​II. Core of the Solution: Multi-Layer Composite Protective Structure Design​
The core of this solution lies in the revolutionary optimization of the traditional cable structure, adopting an integrated architecture of "core transmission–internal stability–multi-layer protection." The cable layers, from inside to outside, are as follows: high-voltage cable silicone body → shielding layer → fire-resistant layer → waterproof membrane layer → polyethylene protective layer. Each layer is endowed with specific high-performance functions.

​​(一) Internal Core and Stable Structure​

1. ​Copper core conductor: As the core for power transmission, it is sheathed with a high-temperature-resistant rubber layer made of inorganic nanocomposite materials, fundamentally enhancing the conductor's heat resistance and effectively preventing self-ignition due to overheating.
2. ​Filled armored rope: Composite filling using polypropylene tape, non-woven fabric, PP rope, and hemp rope significantly enhances the stability and compactness of the cable's internal structure, improving crush resistance and corrosion resistance, and extending overall service life.

​​(二) External Multi-Functional Protective Layers​

1. ​Shielding layer (four-layer structure)​:
• Inner/outer anti-static insulation skin: Forms a basic insulation barrier, effectively preventing electrostatic generation.
• Shielding braided mesh layer: Provides excellent electromagnetic shielding, resisting external interference.
• Metal shielding magnetic ring (Mn-Zn ferrite): A key innovation. Exhibits different impedance characteristics for high-frequency noise at various frequencies, extremely effectively suppressing high-frequency interference, thoroughly avoiding high-voltage hazards and electrostatic ignition. Its shielding performance far exceeds that of ordinary cables.
2. ​Fire-resistant layer (three-layer structure)​:
• Fiberglass fire-resistant cloth layer: Treated and shaped with non-toxic fire-resistant glue, forming the first fire barrier.
• Flame-retardant wrapping tape layer: Works synergistically with the fire-resistant cloth to enhance flame retardancy.
• Aluminum foil layer: The outermost fire-resistant layer, significantly increasing high-temperature resistance, strengthening flame retardancy, and providing additional functions such as thermal insulation and noise reduction.
3. ​Waterproof membrane layer:
• Embedded with water-absorbing and sound-insulating cotton made from fiberglass material, it quickly absorbs infiltrating moisture to ensure internal dryness. Simultaneously, this layer effectively absorbs vibration noise generated during cable operation.
4. ​Polyethylene protective layer (double reinforcement)​:
• Internal: Filled with distributed nylon threads, greatly enhancing the cable's overall toughness and tensile strength.
• External: Sheathed with wear-resistant rubber casing, enabling the cable to withstand complex physical friction and mechanical stress, ensuring long-term durability.

​III. Working Principle and Core Advantages​
​​(一) Working Principle​
This solution achieves comprehensive protection through the synergistic effects of each layer: the copper core conductor efficiently transmits electrical power; the shielding layer filters and suppresses electromagnetic interference through its multi-layer structure, ensuring signal purity and operational safety; the fire-resistant layer forms a continuous barrier in high-temperature or open-flame environments, effectively delaying or even preventing fire spread; the waterproof membrane layer actively absorbs moisture and reduces operational noise; the polyethylene protective layer physically ensures the cable's structural robustness, resisting external damage.

​​(二) Summary of Core Advantages​

1. ​Ultimate shielding performance for safety: The four-layer shielding structure, particularly the innovative inclusion of a ferrite magnetic ring, provides 360° comprehensive electromagnetic shielding, significantly reducing high-voltage hazards and electrostatic ignition risks, leading the industry in safety.
2. ​Exceptional fire resistance and flame retardancy: The triple fire-resistant barrier delivers excellent high-temperature resistance and flame retardancy, effectively controlling fault scope and ensuring power system stability and safety under extreme conditions.
3. ​Comprehensive protective efficacy: Integrates waterproofing, abrasion resistance, thermal insulation, noise reduction, and corrosion resistance. With a stable structure and high toughness, it adapts to various complex and harsh environments such as tunnels, underground mines, coastal areas, and cross-river projects, significantly extending service life.
4. ​Stable long-term operational performance: Internal armored filling and external reinforced protection ensure mechanical strength and dimensional stability, reducing failures caused by deformation and wear, and greatly enhancing operational reliability.

​IV. Application Scenarios​
This solution is particularly suitable for scenarios with stringent requirements for safety, stability, and service life:

• Urban underground utility tunnels and smart grids
• Outgoing lines of large power stations (thermal, hydro, and renewable energy)
• Power supply for industrial plants in high-risk industries such as chemical, mining, and metallurgy
• Submarine power transmission projects across rivers and seas
• Power distribution systems for critical facilities such as data centers, hospitals, and airports