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Let me tell you about the common faults of insulators
The metal conductor inside the terminal is the core part of the terminal, which transmits the voltage signal from the external wire or cable to the corresponding contact of its matching connector. Therefore, due to unreasonable structural design, wrong material selection, unstable mold, rough surface, Unreasonable surface treatment processes such as heat treatment and electroplating, improper assembly, poor storage and use environment, improper operation and use, etc., will lead to poor contact between the contact parts and the mating parts of the contact parts.
Occurrence of Pollution Flashover Accidents of Glass Insulators
With the continuous development of the times, my country's economic level has gradually improved, and power companies have achieved rapid development and achieved good results. Glass insulators are an important part of the power supply system, but flashovers often occur Safety accidents, how much do we know about the causes of flashover safety accidents? Let me introduce them to us below.
Why is the zero value of porcelain insulators so low? Do you know the reason?
When the breakdown voltage of the working frequency of the porcelain insulator is lower than the dry flash voltage, it is an inferior insulator. Damaged porcelain insulators are called zero insulators. According to DL/T626-2015 "Quality Inspection Regulations for Hanging Porcelain Insulators":
orcelain insulator is a special insulation control material, which can play an important role in overhead transmission lines. Insulators were mostly used for utility poles in the early years, and later gradually developed into high-voltage power line connection towers. A number of disc insulators hang from one end to increase the creepage distance. They are usually made of glass or ceramic and are called insulators. Porcelain insulators should not fail due to various mechanical and electrical stresses caused by changes in environmental and electrical load conditions, otherwise porcelain insulators will not be able to play a significant role and will damage the service life of the entire line.
What is a composite suspension insulator?
Composite suspension insulators are composed of iron caps, porcelain bushing fittings (suspension or silicone rubber) and steel feet (guide rods), and are cemented together. All adopt the internationally advanced cylindrical head structure, which has the characteristics of small head size. Light weight, high strength, large creepage distance. It can save metal materials and reduce production line costs. In order to meet the needs of live work, the brim of the hat adopts the traditional household structure shape. Composite insulator products are used to insulate and suspend conductors in HV and EHV AC and DC transmission lines. In the early years, insulators were mostly used on utility poles (low voltage), and gradually developed into many disc or column insulators hanging on one end of the high voltage wire connection tower, usually made of glass, ceramic or silicone rubber to increase the creepage distance. They are called insulators.
What are the characteristics of post insulators
Porcelain post insulators are an important part of electrical equipment in power grids and power plants. The main factors affecting the mechanical strength of pillar porcelain insulators are production process, material stress and operating environment. Defects such as interlayers, pores, and microcracks are mostly caused by the manufacturer's poor firing level, and most of them are concentrated in the same batch of products from the same manufacturer. Statistics show that about 95% of the defects occur near the flange, which is caused by the concentration of internal stress caused by the different expansion coefficients of materials. The impact stress and unidirectional shear stress caused by the long-term operation of the disconnector and the porcelain post at the tube mother are the high-incidence areas for the fracture of the porcelain post insulator.
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