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Corrosion Prevention Principle of Optical Cable Lines

Corrosion Prevention Principle of Optical Cable Lines

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Effective corrosion prevention for optical cable lines combines armored materials, protective coatings, proper installation, and electrical corrosion control measures.

Mechanical and Environmental Protection

Armored cables are widely used to prevent corrosion caused by soil, moisture, rodents, and mechanical damage. Copolymer-coated low carbon steel tape armor provides excellent resistance to corrosion and rodent attacks while maintaining lightning protection and ease of installation. Double-armored cables offer enhanced protection in areas with high rodent activity, and low carbon steel tape is more resistant than copper-clad stainless steel of the same thickness . For harsh environments, GYTA53 and GYFTY cables incorporate steel tapes with PE or LSZH jackets treated for UV, salt, and moisture resistance. ADSS dielectric cables are suitable for areas with high salt concentrations or where grounding is not feasible . Direct burial or conduit installation with double-jacketed armored cables further enhances durability in extreme conditions.

Electrical Corrosion Prevention

ADSS optical cables are susceptible to electrical corrosion due to ground leakage currents and dry belt arcs caused by spatial potential in high-voltage environments. Key preventive measures include:

  • Controlling ground leakage current below 0.3 mA to prevent arcing .
  • Limiting static space potential of the cable sheath (e.g., AT or PE sheaths ≤20 kV for 220 kV systems) to reduce electrical stress .
  • Optimizing hanging points based on induced electric field calculations to minimize electrical corrosion risk .
  • Using anti-vibration whips or hammers to prevent mechanical vibration from creating discharge points .
  • Inspecting and protecting cable surfaces to prevent contamination, cracks, or wear that could allow moisture accumulation and increase induced currents .

Installation and Maintenance Practices

  • Proper burial and conduit placement to avoid mechanical damage and water ingress.
  • Regular inspection for jacket damage, corrosion signs, and wear. Techniques include visual checks, hydrogen gas detection, and reflectometry .
  • Environmental assessment to account for UV exposure, salt fog, ice, and wind loads, ensuring cable selection matches site conditions .
  • Spacing and tension control during installation to reduce mechanical stress and electrical corrosion risk .

Summary

Corrosion prevention for optical cable lines requires a holistic approach combining:

  1. Material selection: armored steel tapes, copolymer coatings, LSZH or PE jackets.
  2. Electrical design: controlling leakage currents, space potential, and proper hanging points.
  3. Mechanical protection: anti-vibration devices, double-armored cables, and proper burial.
  4. Maintenance: regular inspections and environmental monitoring. By integrating these strategies, optical cable lines can achieve long-term reliability and resistance to both mechanical and electrical corrosion in diverse environmental conditions.
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