In the deep refining of mineral oil, the residual polar material is very small, so under normal circumstances, this oil can play a good electrical insulation. However, at very high voltages, hydrocarbons may instantaneously become ionized and become conductive enough for the spark to pass through. After that, the oil quickly deionized and returned to its original insulation level. Despite the high voltage, the oil can further prevent the spark from passing through. However, the energy released by the electric spark through the oil will permanently damage the hydrocarbons and produce a small amount of gas, paint film or sediment. Therefore, the more stable the hydrocarbons in the electrical oil, the smaller the extent of permanent damage. In addition, in order to reduce the generation of flammable gas and prevent fire, electrical oil should have good gas absorption characteristics. Electrical oil must be kept clean and dry to avoid deterioration of electrical insulation.
A small amount of pollution in the oil will greatly increase its electrical conductivity. For this reason, the electrical oil is always transported by special vehicles to the destination, so that it can be avoided to the maximum extent possible by other oils. Since water is a good conductor, it is the most harmful to electrical oil and must be removed by decompression. The typical treatment is: the oil is heated and sprayed into a vacuum-maintaining device. This reduces the boiling point of the water by 7 to 10°C, and the water evaporates from the injected oil. The oil thus treated has a high dielectric strength and is suitable for use as an electrical insulator and a coolant. During the refining, post-processing, unloading and refueling into the system, care should be taken to avoid contamination and care should be taken to prevent contamination during operation.
Contaminants entering the transformer will shorten the life of the transformer and reduce the dielectric effect. Therefore, when designing the transformer, the problem of reducing pollution during manufacture and use should be considered. If water contaminates the transformer, the moisture vapor will diffuse into the transformer oil. The diffusion coefficient of water is affected by physical conditions such as temperature, oil circulation speed, and power load. The chemical state of the oil is also an influencing factor.
Handheld Laser Welding Machine
Better weld formation: YIHONG or STARTNOW welding head,Swing welding mode, spot width can be adjusted, welding fault tolerance is strong, make up for the disadvantage of laser welding spot small, expand the tolerance range of machining parts and weld width, get better weld forming.
Adjustable width, can have certain penetration to thick plate, suitable for fillet welding,
It is used for weld and wire feed welding
Adjustable diameter, uniform energy density distribution, It has obvious advantages when welding the high frequency thin plate.
Can adjust the diameter size, the main effect is to reduce the hollow spot to make the spot largerr ,which makes the plate more evenly exposed to light radiation, which is suitable for welding at various angles
Adjustable width, while reducing the hollow of the spot, the energy of 3 sides can make the board;The middle and left and right sides of the material are fully heated, and the frequency can be reduced when adding wire feed welding.When the rate is lowered, the welding spot can appear as fish scales, compared with single swing welding.The joint effect is remarkable
Laser Welding Machine,Metal Welding Machine,Handheld Laser Welding Machine,Handheld Laser Welder
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