An insulator is an insulating control that used to be used for telephone poles and has now gradually developed into a disk-like insulator hung at one end of a high-voltage wire connection tower, usually made of ceramic or glass. It plays an important role in the overhead transmission line, that is, it supports the wire and prevents the current from returning to the ground. The insulator should ensure that when the environmental and electrical load conditions change, the various electromechanical stresses remain unchanged, otherwise it will not only play a due role, but will damage the service life of the entire line.
The advantages and disadvantages of glass insulator and porcelain insulator: glass insulator The insulator device is made of glass, called glass insulator; At present, the most widely used in the line is the tempered glass insulator. Ceramic insulator is made of electrical ceramic insulator, ceramic insulator is the earliest insulator, the process is simple, but it does not have the advantages of not easy to accumulate dirt, in fact, the pollution of ceramic insulator is also very serious in the field, the biggest advantage of glass insulator relative to ceramic insulator is that there is no need to carry out zero value detection, zero value glass insulator will self-explosion
Glass insulator: has good mechanical and electrical properties, its tensile strength, electrical breakdown resistance, vibration fatigue resistance, arc burn resistance and thermal shock resistance are better than porcelain insulators. And unlike porcelain insulators, glass insulators have the insulation self-elimination ability of zero self-detonation, so that it is easy to be found without insulation testing. The self-detonation rate is usually higher in the first 3 years, which is the opposite of porcelain insulators. Decades of operation and test data prove that tempered glass insulators have long-term stable electromechanical properties and long service life.
Ceramic insulator: It has the advantages of good insulation, climate change resistance, heat resistance and flexible assembly, and is widely used in various voltage levels of the line. Disk porcelain insulator is a breakdown type, it is the use of cement to physical and chemical properties of different porcelain and metal parts of the glue, in a long time to withstand the electric field, mechanical load and natural sunlight, wind, rain, snow, fog and other effects, will gradually deteriorate, a threat to the safe operation of the power grid. In particular, when the insulator string containing the degraded insulator flashover (due to lightning or pollution flashover and other reasons), the head of the degraded insulator may instantly heat and explode, resulting in the accident of wire landing. The advantages and disadvantages of glass insulators and porcelain insulators can be used according to the line design.
