Selection of Synthetic Insulated Zinc Oxide Lightning Arrester Manufacturers

1.1 "Zinc Oxide Electric Porcelain Lightning Arrester Manufacturer

Since the West Porcelain Institute, West Porcelain Factory, and Fu Porcelain Factory jointly introduced the world-advanced MOA manufacturing technology from Hitachi, Japan in the mid-1980s, the quality of domestic MOA production has made considerable progress. Because the core of MOA-zinc oxide resistors has the characteristics of good nonlinearity and high energy density, MOA can not only be made with gaps, but also can be made without gaps (SICA can only be made with gaps). In addition to the characteristics of good non-linearity and high energy density, the gapless MOA also has the characteristics of simple structure, fast response time, and no freewheeling. It can ensure that strong current facilities are protected before lightning overvoltage or operating overvoltage damages its insulation performance. It exercises protection. Due to the time lag effect of the gap, the gap distance and the protection characteristics of the gap MOA have a problem with each other. In comparison, the gapless MOA is simpler and more reliable to use. However, since there is no gap in the gapless MOA, the internal zinc oxide resistor must withstand the working voltage for a long time, and the corresponding parameter selection should be adjusted appropriately. In the mid-1980s, the gapless MOA of the 10 kV power distribution system was not adjusted in time due to parameter selection, and the maximum charge rate that the zinc oxide resistors could withstand was low at that time, only reaching about 50%, resulting in the gapless MOA at that time The accident rate is high. After adjusting the corresponding parameters and improving the formula and process of the zinc oxide resistors, the maximum charge rate that the zinc oxide resistors can withstand is increased to about 85%, thereby reducing the accident rate of the gapless MOA to a normal level.

1.2 "Synthetic insulated zinc oxide surge arrester, surge arrester manufacturer

Compared with SICA, the gapless MOA has the advantages of large flow capacity, fast response time, and reliable protection. But their common weakness is the porcelain jacket, which can only be sealed at both ends, and there is an air gap inside, which makes it difficult to reliably seal in mass production. According to industry statistics, under normal circumstances, more than 80% of the cause of damage to the porcelain jacketed arrester is due to moisture infiltration due to poor self-sealing. In 1992, people applied the modern insulation technology of organic synthetic insulation to MOA, and developed a new type of CMOA. In addition to the advantages of gapless MOA, CMOA has the following advantages:

Moisture-proof: using a special material potting or integral molding process, there is no air gap inside, and moisture cannot penetrate.

Explosion-proof: Even if it is struck by a direct lightning strike, the organic jacket will not explode and endanger people and objects around it, at most it will only partially crack.

Anti-fouling and self-cleaning: The organic coat has "hydrophobicity" and is not easy to accumulate. Even after the accumulation of fouling, the dirt will also become "hydrophobic", which greatly increases the pollution flashover voltage and has better insulation performance.

It also has the advantages of small size, light weight, no damage to transportation, no rust, and very convenient installation pre-test. Due to the reliability of the product's protection of high-voltage facilities and its high reliability, CMOA can increase the interval between preventive tests.

The development of CMOA has undergone three stages of improvement since 1992.

The first stage: the umbrella skirt is made individually, then glued into the entire jacket, and finally a special material is poured between the positioned jacket and the zinc oxide resistor to make it (potting type).

The second stage: multiple umbrella skirts are made at one time, which overcomes the quality problem of poor adhesion of single umbrella skirts during mass production (potting type).

The third stage: The organic synthetic insulating material is directly molded on the periphery of the zinc oxide resistor core to make it integrated. It overcomes the poor bonding of the first and second stages of the process or the different thermal expansion coefficients of the three layers of materials (organic synthetic insulating outer layer, special potting material intermediate layer, and innermost layer of zinc oxide resistors) which may appear during long-term use. The possibility of relative sliding between the two interfaces and the infiltration of moisture (overmolded type).

Yichang Hengyuan Technology Co., Ltd. is a professional manufacturer of European-style cable connectors, plug connectors, cable branch boxes, American elbows, high-voltage vacuum circuit breakers, high-voltage load switches, lightning arresters, zinc oxide arresters, tank arresters, overvoltage protectors, Counters, monitors, heat-shrinkable cable accessories, cold-shrinkable cable accessories, T-heads, wall bushings, European cable accessories, American cable joints, transformer neutral point protection devices, fuses, isolating switches, PT cable heads, elbows Manufacturers of type cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products