How to choose three phase transformer
First: Select the material requirements of the three-phase transformer
Three-phase transformers are composed of silicon steel sheets and windings. The windings can be made of copper or aluminum wires. Their prices differ by 110% -140% for small three-phase transformers, and between 150% -180% for medium power. High power. Transformer prices differ by more than 200%, and their price differences are very large. In foreign countries, transformers are generally all-copper windings with few aluminum wire windings. However, China is relatively short of copper, and its copper prices are very high. , This is also impossible
However, all-aluminum three-phase transformers are also in compliance with national production standards. Transformers made of two materials are not much different in use, but all-copper transformers will do better in efficiency and temperature rise, and will also affect Expired service life, but this factor is also not very important, because the service life of the transformer is not only determined by the copper and aluminum wires. The transformer is subject to a lot of failure due to improper use of the three-phase transformer. The effects of aging, short circuit, lack of regular maintenance, use environment does not meet its product standards and other factors.
Second: The three-phase transformer is not only divided into all copper, all aluminum, but also the wire and enameled wire. The silicon steel sheet is also produced by ordinary manufacturers and is different from the silicon steel sheet we purchase from Wuhan .
The temperature of silk covered wire is only 120 ℃. What is the concept of 120 degrees? The lighter can burn its insulation layer. Once it is short-circuited or full load or overloaded, it must be damaged within a short period of time. The temperature of the enameled wire can reach 180 ° C and the voltage can be 2500V (relative to 5000V). Load, overload operation, short-term can also be sustained in a short time, will not easily burn out, the three-phase transformer produced by ZTELEC can reach H-class insulation, the design life is 20 years, its Before the three-phase transformer leaves the factory, short-circuit experiments are also performed on the transformer to ensure the product qualification rate.
Third: the efficiency of the transformer
Transformer companies say that the greater the power of the transformer, the higher the efficiency. The efficiency of low-power control transformers, row lamp transformers, machine tool transformers, and isolation transformers is generally about 95%. Although the efficiency is not high, the load is low and the losses are not high; high-power machinery and equipment The efficiency of the supporting transformer is about 98%. The two efficiency factors are the efficiency of the all-copper transformer, and the aluminum wire is lower. The transformer itself is an efficient and energy-saving product. The main loss is the problem of transformer heating and hotness. The load equipment of high-power transformers cost hundreds of thousands of dollars per hour. Every 1% lower power can save a lot of money. The efficiency factor of small transformers may not be very important but high-power three-phase transformers must consider this. Problems, and the silicon steel sheet material and winding material of silk-covered wire and enameled wire will also have a large difference in high-power transformers. Enameled wire is more efficient than silk-covered wire, enameled wire is more secure and stable than silk-covered wire and enameled wire material is better than silk-covered The use time of the wire is longer; the loss caused by the loss of the electricity cost and the short service life of the transformer made by the silk-covered wire may be higher than the price of buying a three-phase transformer of all copper enameled wire produced by our company. High prices have high reasons, and low prices have low reasons. You can’t just look at the price but not the quality.
Third: safety and stability, temperature rise and noise of three-phase transformers
In fact, the solution of this problem mainly depends on several processes of Shanghai Jinjia Electric Appliance. Vacuum dipping and high-temperature drying of the product can perfectly solve the noise and loudness of the transformer during the operation of the three-phase transformer. After the vacuum dipping of the three-phase transformer, the product can be used. The whole is coated, firm, and filled with gaps. The silicon steel sheet does not vibrate during the operation of the transformer, so the sound is reduced to a small level. The high temperature drying at 155 ° C can ensure that our products are made of enameled wire, because the maximum temperature of the wire is 120 degrees. ; And the insulation outside the transformer touches the insulation layer instead of the transformer itself, which guarantees the safety of personnel.
Fourth: the price difference between three-phase isolation transformer and three-phase autotransformer.
The three-phase transformers are generally three-phase isolation transformers rather than autotransformers. Unless customers require autotransformers. Three-phase isolation transformers have two different windings: primary and secondary. The output and output of the coupling transformer share one winding, and only half of the windings and iron core are required for the material use. The price will also differ by about half. The size and weight of the three-phase autotransformer will be much smaller than the three-phase isolation transformer.