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The annual average air humidity in most parts of Southeast Asia is always at a high level, and the monsoon rainy season will make the environmental humidity stay at an ultra-high state for a long time. Power cables laid outdoors, in cable trenches and underground are easily affected by damp erosion, resulting in outer sheath aging, insulation performance decline and internal moisture penetration. Once the cable ages prematurely, it will cause leakage, tripping and even short circuit faults, affecting the normal power supply of the whole project.
Damp aging is a slow and hidden process, which is easy to be ignored in daily management. Only by taking targeted protection measures can the service life of power cables be greatly prolonged.
| Damp Aging Stage | Typical Performance Characteristics | Progressive Hidden Danger | Targeted Protection Measure |
|---|---|---|---|
| Initial Damp Erosion | Cable surface slight discoloration, sheath toughness decreased | Insulation resistance slowly drops, hidden leakage risk breeds | Keep cable trench well ventilated, avoid long-term closed damp environment |
| Mid-term Aging Deterioration | Outer skin cracking, local mildew and corrosion | Moisture invades insulation layer, easy to cause phase to phase short circuit | Adopt sealed wiring protection, use waterproof accessories at connection ports |
| Late-stage Failure Trend | Cable hardening embrittlement, obvious aging and damage | Sudden breakdown and power failure, easy to induce electrical fire | Replace severely aging cables in time, avoid continuing overload operation |
| Coastal Salt Damp Composite Erosion | Sheath corrosion aggravated, metal armor rusted and broken | Cable structural damage, greatly shortened service life | Use anti-corrosion armored cable, match pipeline sealing laying mode |
During the monsoon rainy season, strengthen the inspection of cable trenches, underground laying lines and outdoor overhead cables, timely drain accumulated water and clean mildew and dirt. For key engineering lines, regularly test insulation performance, find aging signs early and make replacement plans in advance, so as to ensure the long-term safe operation of power cables in humid tropical climate.