Analysis Of The Causes Of High-voltage Disconnector Insulator Fracture Accidents

Manufacturing defects in the porcelain insulator material itself are a significant factor leading to breakage. Improper control during firing can cause uneven internal density and under-firing defects in the porcelain components. Substandard cement bonding quality also reduces the tensile and flexural strength of the insulator. Inadequate quality control means these inherent defects may go undetected during assembly, increasing the risk of breakage during subsequent operation.

During operation, high voltage electrical isolator is subjected to various forces such as torque, thermal stress, and installation tension. Long-term cyclic mechanical load accumulation will induce crack propagation in stress concentration areas. In addition, improper on-site operation, such as applying excessive torque when closing or opening the isolator high voltage switch, can also damage the integrity of the insulator in a short period of time.