What is the main reason for the damage of composite insulators?

Abstract: In the early years, insulators were mostly used for telephone poles. With the development of science and technology, many disc insulators are hung at one end of high voltage wiring tower. Among them, the composite insulator material is composed of glass fiber epoxy resin pull rod, silicone rubber umbrella skirt and hardware fittings. Composite insulators are easy to be damaged due to long-term exposure to the external environment. The main reasons for the damage of composite insulators are creepage marks, oil leakage and corona. Next, this paper will briefly introduce the composition of composite insulators and the main reasons for the damage of composite insulators. Let's have a look! 1. What are the compositions of composite insulator materials?

Composite insulator, also known as glass fiber epoxy resin mandrel, is mainly composed of glass fiber epoxy resin pull rod, silicone rubber umbrella skirt and hardware.

The silicone rubber umbrella skirt adopts integral injection molding process, which solves the key problem affecting the reliability of composite insulators: interface breakdown. The connection between glass tie rod and hardware fittings adopts the most advanced crimping technology, and is equipped with automatic acoustic wave flaw detection system, which has the characteristics of high strength, beautiful appearance and small volume.

Second, what is the main cause of composite insulator damage?

Composite insulators and insulating sleeves are affected by working voltage and overvoltage, conductor weight, dead weight, ice weight, wind power, short-circuit electromotive force of the system, mechanical force and vibration force of equipment operation, and also by changes in atmospheric conditions and environmental pollution. Therefore, its working conditions are bad. Common faults and their causes are as follows:

1, creepage trajectory. The reason is that the insulation surface forms a path due to discharge carbonization, which gradually develops, leading to flashover grounding short circuit accident.

2. Oil leakage. The reason is that serious oil leakage such as cracking, dislocation and aging of sealing materials will cause insulation breakdown of casing and may also cause equipment damage.

3. Corona. The reasons are the discharge of the protruding part on the terminal fittings, the surface discharge of the insulation surface pollution, cracks and internal defects.

4. The terminal is overheated. Overheating, discoloration and shortened insulator life caused by poor connection.