In substation equipment operation records, the insulation support structure of the High Voltage Disconnect Switch insulator has always been a key area of ​​focus for maintenance. As the core component bearing the conductive and insulating functions, the porcelain insulator's rupture or breakage can significantly impact equipment stability. If a high-voltage disconnector experiences a porcelain insulator breakage fault, it is often accompanied by changes in structural stress and a decline in insulation performance. How does this type of fault form? What technical characteristics does it exhibit during operation? Based on power equipment operation and maintenance data, this paper analyzes the relevant situations regarding high-voltage disconnector porcelain insulator breakage.

Factors Contributing to Porcelain Insulator Structural Damage

Insulation Material and Manufacturing Quality Influence

In some cases, porcelain insulator breakage faults in high-voltage disconnectors are related to the manufacturing process of the insulation components. If there are density differences or bonding quality issues during the firing and assembly stages of the porcelain insulator, latent defects may form in the internal structure. After long-term operation, the mechanical stress and temperature changes continuously accumulate, gradually causing microcracks in localized areas. Once these cracks expand to a certain extent, structural breakage occurs.

Operating Mechanical Stress Changes

High-voltage disconnectors bear conductor tension and mechanical operating forces during operation. Installation angle deviations, changes in conductor load, and operating mechanism torque can all generate additional bending stress on the porcelain insulator. When the supporting structure is under stress for a long period of time, the material strength gradually decreases, and cracks may propagate in localized areas, eventually leading to insulator breakage.