Sulfur hexafluoride circuit breaker porcelain bottle and manufacturing process thereof

Abstract

The invention relates to a sulfur hexafluoride circuit breaker, in particular to a sulfur hexafluoride circuit breaker porcelain bottle and a manufacturing process thereof. The bottle is obtained by blending and firing hydromica clay, kaolin, feldspar, bonding clay and artificial mullite, wherein concrete components and mixture ratios are: 3.8 to 4.2 percent of K2O and Na2O, 70 to 72 percent of SiO2, 23 to 25 percent of Al2O3, less than 1.0 percent of Fe2O3, and less than 0.1 percent of TiO2. The process comprises a concrete course as follows: proportioning materials; ball-milling the materials; discharging pulp; performing sieving; refining clay; molding clay; drying clay; glazing blanks; firing the blanks; and taking the obtained products out from a kiln. The invention has the advantages that the products of the invention all meet national standard GB772-2005 and product pattern requirements, have mechanical properties completely meeting requirements, are large in margin and free from the phenomenon that porcelain bushings crack during assembly, and are fundamentally improved in air tightness.

Description

technical field [0001] The invention relates to a sulfur hexafluoride circuit breaker, in particular to a porcelain bottle for a sulfur hexafluoride circuit breaker and its manufacturing process. Background technique [0002] Using sulfur hexafluoride (SF 6 ) gas as a circuit breaker for arc extinguishing medium and insulating medium. SF for short 6 breaker. The use of sulfur hexafluoride as an arc extinguishing medium in circuit breakers began in the early 1950s. Due to the excellent characteristics of this gas, the voltage and current parameters of this circuit breaker are much higher than those of compressed air circuit breakers and oil-less circuit breakers, and do not require high air pressure and a considerable number of serial breaks. In the 1960s and 1970s, SF 6 Circuit breakers have been widely used in ultra-high voltage and large-capacity power systems. In the early 1980s, SF with single fracture of 363 kV, double fracture of 550 kV and rated breaking current...

AI Technical Summary

Problems solved by technology

[0006] ②Tank structure: It adopts the advantages of box-type multi-oil circuit breaker, and installs the circuit breaker and transformer together. It has a compact structure, strong earthquake resistance and anti-fouling ability, but the series is poor

[0007] LW3 sulfur hexafluoride circuit breaker is a new generation of electrical appliances developed in the 1990s in my country. It is widely used in 10KV, 12.5KV, and 20KV lines. It plays an important role in improving line safety and long-distance operation. High mechanical strength and high air tightness are required, and it is difficult to produce domestically. In the early stage of development, it has to be imported from abroad. In the late 1990s, it began to manufacture such products with high-alumina and high-strength formulas to replace imports.

with Al 2 o 3 High-aluminum high-strength formula prepared with bauxite with a content of more than 85%, its Al 2 o 3 The content can be as high as 35% to 45%, and the mechanical strength is very high. Because bauxite contains Fe 2 o 3 、TiO 2 , so that after the porcelain is fired, iron-titanium spinel and corundum coarse crystals are formed in the porcelain body, which makes the porcelain brittle and produces microscopic cracks and iron-titanium melting holes on the edge of the coarse crystals, resulting in air leakage during the use of the porcelain bottle. According to the manufacturer's reflection , some porcelain bottles have an air leakage rate as high as 5% to 10%, and generally reach 1% to 3%, and because the porcelain is brittle, it is easy to crack during assembly.