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10KV, SF6 load switch specification for quality control

Abstract: 10KV, SF6 load switch device is safe, easy to install, less maintenance, small size, cheap, safe and reliable. At the same time limiting the load switch and fuse with the better protection of the transformer, it has been widely used in foreign countries. As in industrial countries (such as Europe, Japan),[link widoczny dla zalogowanych], circuit breakers and load switches 6 ratio of 1:5. Circuit breaker is mainly used for primary distribution, and load switches for secondary distribution Keywords: 10KVSF6 load switch secondary distribution 10KV, SF6 load switch device is safe, easy to install, less maintenance, small size, cheap, safe and reliable. At the same time limiting the load switch and fuse with the better protection of the transformer, it has been widely used in foreign countries. As in industrial countries (such as Europe, Japan), circuit breakers and load switches 6 ratio of 1:5. Circuit breaker is mainly used for primary distribution, and load switches for secondary distribution. As in China, urban network construction and transformation of the continuous further development of the load switch device 10KV power distribution system and terminal ring network transmission applications is also increasing. The past few years have been from Guangdong, Beijing, Shanghai, Tianjin and gradually across the country. But the present, 10KV, SF6 load switch market mainly by foreign companies (such as ABB, Schneider DS, etc.) occupied, with the domestic manufacturers of SF6 load switch and gradually master the technology, domestic SF6 load switch the quantity and quality have been increased steadily. Present, China has more than a dozen manufacturers producing a variety of different types of SF6 load switch. Long Yuan in Beijing in this limited liability company switching equipment, the production of SF6 load switch, for example, on several key technology to do some quality control problems described. First, epoxy resin insulation case of quality control epoxy because of its good mechanical, insulation, anti-aging and manufacturing process performance, has become the first choice for manufacturing high-quality insulator, while the pressure gelation process due give full play to the performance advantages of epoxy resin, the current international and domestic brands SF6 load switch with insulation housing all the pressure from the gel made of epoxy resin. The same time assumed the switch housing insulation, air tightness, mechanical support function, making it complex structure, mechanical properties and accuracy requirements are high,[link widoczny dla zalogowanych], no doubt on material selection, manufacturing process have made a strict requirements. Epoxy material selection: basic type of epoxy resin (ie, large resin plant produced thousands of tons of annual production of epoxy resin) and curing agent can not be directly used to produce insulation parts, especially SF6 insulated switch is used in the shell and the curing agent of epoxy resin is modified with special handling needs to improve its mechanical strength, toughness, and improve its resistance to thermal shock properties and processing performance. Modification of different manufacturers is different, so the focus for different product requirements, and for SF6 insulated switch housing because it itself is a support piece, the switch points, the process is subject to certain joint impact on the epoxy resin presented a higher strength requirements; switch housing in the filling of SF6 gas and to ensure low leakage rates to insert the epoxy resin on the adhesion of the requirements put forward higher; in recent years, SF6 load switch or work in the production of shell cracking incidents have occurred, tested, cracking the shell used in the tensile strength and bending strength is not low, which represents the impact strength of ductile materials is low. SF6 insulated switch shows the impact strength of the shell is the most important indicators of the performance. Domestic production of HE2082-HH2082 material particularly suitable for production of SF6 insulated switch housing, the system glass transition temperature measured 104 ℃, to meet the requirements of an international brand 100 ℃ ~ 110 ℃, and the impact strength of 15KJ/m2,[link widoczny dla zalogowanych], more than the general formula system 50%, with excellent toughness, and because of its excellent adhesion, production of switch housing has an extremely low leakage rate. Microsilica: epoxy resin cured by adding silica fume can improve the heat resistance, hardness and dimensional stability, and reduce production costs. Silica powder as the source and production process of mining different, the properties of cured epoxy resin have a great impact. In the production of generic products are often the mixture viscosity or the amount of silica powder can be added as key indicators to measure the quality of silica powder. However, important pieces of insulation as a production formula system, the curing performance of choice as a measure of the quality indicators of microsilica. High-quality silica powder added after adding high viscosity epoxy, can be added to the amount so low, the analysis is the high content of silica in the resulting needle-like particles, which is precisely to improve the mechanical strength of epoxy resin. Dyes: no wonder that the organic dye used for epoxy resins and inorganic stains two types of dye, organic dye compounds reinforced epoxy resin had no effect on electrical insulation properties; and Inorganic dye-based multi-metal oxide is iron oxide, adding cured epoxy resin will increase the dielectric loss, so to ensure the electrical insulation products, formula system, so as not to add inorganic colorants. To ensure the electrical insulation properties, electrical grade silica powder of the Fe2O3 content of the technical requirements as ≤ 0.01%. If the recipe system compared with 1.5% by epoxy iron oxide red powder is equivalent to Fe2O3 silica powder content increased to 0.5%, to 50 times based on content, the electrical insulation performance can imagine the negative impact of large extent. Insert pre: epoxy resin in order to ensure good adhesion of the insert, the insert is a good pre-critical. Pretreatment of inserts, including sandblasting, cleaning oil and dust, and mold temperature accurately to the same warm and be careful not to over-oxidation, in order to avoid oxidation of copper is very low impact strength epoxy resin adhesive strength of the inserts. And to ensure that inserts in the flow process can not be secondary pollution. Epoxy bonding of inserts not only ensures good low leakage rate, but also makes the product has an extremely low partial discharge. In 15KV discharge, the measured only 5PC. After curing, shaping, cooling: epoxy resin at room temperature,[link widoczny dla zalogowanych], the elastic modulus is high, such as the shear modulus to 4000MPa, was rigid state; when the temperature exceeds the glass transition temperature, the shear modulus of elasticity is only 40MPa, was high-elastic state. In a small external force to be deformed, the use of this feature, you can switch after the curing process will SF6 insulated top and bottom shell casing is placed on the combined accuracy of a certain shape on the plate, after curing, a low cooling rate (≤ 5 ℃ / h) of the product with the furnace cooling, insulation will not only help ensure that the shell and lower shell of the plane occlusal surface has a smaller error,[link widoczny dla zalogowanych], but also the internal stress of the entire product is very low, and will not deform or crack in a future phenomenon. After this matching process and to the right, upper and lower shells of cooperation between the gap ≤ 0.25mm, so that the upper and lower shell of the lock together the deformation is extremely small, allowing for the deformation stress minimum, to ensure the safe use of the switch will not result in cracking leakage phenomenon.