In the power system, power fittings are a kind of metal fittings that can transfer mechanical loads, transfer electronic loads and provide protection. They can be used to connect and combine into various devices. In the power supply system, the power fittings used need to withstand greater tension to ensure the normal connection of the line. Therefore, damage to power fittings may cause line failures. Except for a few high-voltage distribution lines of 10KV and above laid underground, most of the cables are erected in the open air. The horizontal arm of the iron tower is a power fitting, used to support the weight of the cable in the line. The distance between the high-voltage cable and the ground is only a bottle, and the insulation distance is short. Once the cross arm of the iron tower is exposed to the air and is corroded, it will affect the safety, stable and continuous operation of the pipeline, especially in the industrially developed areas where the acid content is high due to acid corrosion, high load and high acid content in the air. The aging speed of the cross arm will accelerate, prone to corona and trip accidents.
Anti-aging performance analysis of insulators: Glass ceramic insulators have nearly one hundred years of use experience, and their anti-aging ability is very strong. Within a period of time after commissioning. Through detection means, a small amount of degraded insulators can be replaced. But as the running time increases, its aging will become more serious. After tempering the glass, compressive stress is formed on the surface. If there are micro-cracks on the glass surface, the micro-cracks will be compressed without expanding due to the action of the solid stress. The electrical strength of glass generally remains unchanged during the entire operation, and its aging process is much slower than porcelain.
Detailed introduction of the mechanical strength of insulators: Through the comparison test of the electromechanical properties of glass ceramic glass ceramic insulators with different operating years, it is found that the test value of some glass ceramic insulators is lower than the standard value of the factory test value after 15 to 20 years of operation. The qualification rate increases as the service life increases. The stability and dispersion of glass is better than porcelain. The high frequency vibration fatigue test results of porcelain and glass ceramic insulators show that the electromechanical strength of glass ceramic insulators will be significantly reduced after high frequency vibration. Reason: On the one hand, due to factors such as the material and manufacturing process of domestic glass ceramic insulators, the quality is highly dispersed.