The insulation layer of power cables is the core component for ensuring safe power transmission. The insulation material will gradually age under various factors, and the aggravation of aging will increase the probability of leakage and breakdown. Proper prevention and control can delay the aging process.

The factors causing insulation aging can be divided into two categories: internal and external. The main internal factors are long-term overload operation, increased current causing the cable temperature to continue to rise, and changes in the molecular structure of polymer insulation materials at high temperatures, resulting in decreased elasticity and material brittleness. External factors include humid environment, acid and alkali corrosion, long-term exposure to ultraviolet radiation, as well as small cracks caused by external pressure. Water vapor enters through the gaps, accelerating insulation degradation.

In daily management, it is necessary to strictly control the cable load and avoid long-term operation beyond the rated current. Take anti-corrosion measures for buried road sections, and use UV resistant sheaths for outdoor cables. During the construction process, control the bending radius of the cable to avoid excessive bending and internal insulation damage.

Regularly conduct insulation testing, track changes in insulation status through test data, and identify aging trends in advance. Once there are obvious abnormalities in the detected values, promptly investigate the location and arrange for maintenance and replacement. Continuously control various influencing factors, delay insulation aging, and reduce the power supply impact caused by cable failures.