First, pay attention to buying transformers
At present, the biggest reason for the price difference of conventional transformers is isolation transformers or autotransformers. From the quality point of view, it seems that there is a very obvious gap in service life, safety and efficiency between silicon steel sheet and wire in terms of materials, technology and workmanship.
What is an isolation transformer? Isolation transformer means that the transformer not only has transformation function in the power grid, but also has primary and secondary copper foil shielding, which can effectively protect the interference of power grid harmonics to equipment, and can also shield the interference of power grid harmonics to equipment and purify the power supply. Some precision instruments and UPS batteries require high purity of power supply, which can maintain equipment and instruments, especially UPS, which can greatly improve its service life. The most important function is to play a role in safety isolation and prevent electric shock. The primary and secondary generate voltage through electromagnetic induction, which is completely isolated from electricity. If you accidentally touch one output line, you won't get an electric shock, but don't touch two at the same time, otherwise your life will be in danger. At present, transformers on the market are generally isolated transformers, unless customers need autotransformers themselves.
What is an autotransformer? There seems to be no difference between autotransformer and isolation transformer. The biggest difference in appearance is that the volume and weight are much smaller than that of the isolation transformer, because the input and output of the autotransformer are all connected by a line, the winding is half less than that of the isolation transformer, and the iron core consumables are much less, so the weight and volume will be much smaller. Moreover, the function of changing voltage cannot achieve the effects of safe isolation, electric shock prevention and harmonic shielding. The transformers sold by our company generally sell isolation transformers. If you don't understand, be sure to ask the seller whether the transformer is isolated or autotransformer. The price difference can be about half. Autotransformers are usually sold by some small companies and workshops. Because it is not difficult to make and easy to use, you don't have to expect convenient quality. Generally, the service life is 3-5 years, which will cause accidents, electric shock, damage to equipment and delay the construction period.
Second, how to choose?
If you have money, you can choose Schneider and ABB for small single-phase control transformers and machine tool transformers. They don't produce three-phase high-power transformers, and the price is generally 2-3 times that of domestic products. In fact, the quality is similar to that of our domestic products, and it is no different from high-tech equipment. It can be said that the purchase freight of small transformers accounts for a large proportion. For example, there is a BK- 1KVA transformer from Shanghai to Yinchuan today, with a total weight of 17KG. Express freight is 255 yuan for Zhongtong and Shentong, and Debon 1 10 yuan. Our transformers are only sold in 290 yuan, and the local minimum freight can be reduced by tens to thousands. Domestic high-end quality, you can choose some state-owned enterprises, and the price is only similar to that of imported ones. In Shanghai, you can choose Shanghai Jinsheng Electric Equipment Manufacturing Co., Ltd., Shanghai Win-Win Electric Co., Ltd. and other old factories, at least in Shanghai where the subway is developed now, to see how the quality is. If you pay attention to the price, you can choose enterprises in Zhejiang. The domestic price is basically the lowest, the price is one third less than ours, and the profit is higher than ours. Why is the price so low? After reading the above information, you will understand that Zhengtai and Delixi only produce switching power supplies, and transformers, regulators and regulators are all OEM in other factories in Zhejiang. This is the meaning of high price and low distribution.
From this, we can know that the prices of conventional transformers are quite different at present, because their working principles and design methods are not the same, and there is a very obvious gap in corresponding workmanship, service life, safety performance and efficiency. Moreover, in the process of selecting transformers, we should first refer to the maturity of their manufacturers' technical scale. For example, we think that the service life and actual use effect of transformers introduced by production organizations with reliable technical scale will not be much different. You can combine these standards and understand the above.