Hidden Dangers In Power Grid Operation: Why Does High Load Become A "life-shortening Smoke" For Insulators?

Power grid equipment operating under high-voltage conditions for extended periods is most vulnerable to invisible, chronic damage. Many times, people have noticed that the performance of the polymer suspension insulator has declined! The root cause is that it has been running under tremendous workload.

A "chain reaction" caused by overload

suspension type insulator Under long-term heavy load conditions, electrolytic corrosion will occur. This is not an exaggeration. When transmission line current surges, the thermal effect on the equipment surface intensifies significantly. This combination of sustained high temperature and strong electric field acts like torture on the equipment.

This high-intensity pressure disrupts the chemical balance of the insulator surface. The originally smooth surface begins to develop fine, dendritic marks under the long-term stress of the electric field. This is the initial manifestation of electrolytic corrosion, directly damaging the material's hydrophobicity.

Physical degradation under adverse conditions

Once it enters this harsh operating mode, the material of composite tension insulator will undergo a fundamental change. This can be understood as a form of "overuse damage," where the frequency of partial discharge increases under high load.

• Surface carbonization: The heat generated by the strong current causes carbon to precipitate on the surface of organic materials, forming conductive channels.

• Physical pitting: Long-term discharge will act like a small chisel, leaving pits on the high voltage transmission line insulators umbrella skirt that are difficult to see with the naked eye.

• Increased contamination: After the surface becomes rough, dust and salt in the environment adhere more easily, leading to more serious leakage current.

The critical point of performance collapse

Under prolonged high-load conditions, overhead power line insulators circuits will develop electrolytic corrosion, which is irreversible. When the depth of electrolytic erosion reaches a certain level, the insulation strength inside the tension insulator will drop precipitously. Especially in humid weather, these electrolytic corrosion marks can quickly evolve into a breeding ground for flashover accidents.

If these devices that are "enduring" high loads are not monitored, by the time scorching marks become visible to the naked eye, the best time for treatment has often passed. This chemical deterioration caused by the load is the invisible killer that leads to frequent circuit breaker trips.