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The basic problem of transformer design is magnetic flux and current density. The current and capacity of the vacuum oil filter transformer are proportional to the current density (ie, the thickness of the wire) to consider the amount of heat generated by the conductor. For magnetic flux, the basic relation of electromagnetism is u = 4.44fwΦ, where u is the voltage; f is the frequency, here is 50Hz, the fixed value; w is the number of turns of the coil; Φ is the magnetic flux. Since the magnetic flux density B of the silicon steel sheet is limited by the material, generally only 1.4-1.8 Tesla can be designed, and Φ=BS. Therefore, to increase Φ, the cross-sectional area of ​​the iron core generally can only be increased. The core of the transformer is generally a three-phase column. The cross-sectional area of ​​the core can be determined according to the above formula. The size of the core window must consider the principle of putting the coil in. The larger the capacity of the transformer, the thicker the wire, the larger the core's window needs to be.
From the analysis of the above problem, it can be seen that the choice of the core is related to the voltage, and the choice of the conductor is related to the current, that is, the thickness of the conductor is directly related to the amount of heat generated. In other words, the capacity of the transformer is only related to the amount of heat generated. Vacuum oil filter For a well-designed transformer, if it is working in a poor heat environment, if it is 1000KVA, if it enhances the heat dissipation capacity, it may work at 1250KVA. In addition, the nominal capacity of the transformer is also related to the allowed temperature rise. For example, if a 1000KVA transformer allows a temperature rise of 100K, if it can be allowed to work up to 120K under special circumstances, the capacity is more than 1000KVA. . It can also be seen that if the heat dissipation condition of the transformer is improved, its nominal capacity can be increased. Conversely, for the same capacity inverter, the size of the transformer cabinet can be reduced.
Vacuum oil filter transformer design generally only see the rated capacity, but not see the rated power, because its current is only related to rated capacity. For the voltage source inverter, because its input power factor is close to 1, the rated capacity and rated power are almost equal. Current source inverter is not the case, its input side transformer power factor at most equal to the power factor of the load asynchronous motor, so for the same load motor, its rated capacity than the voltage source inverter transformer larger.
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The classic problem of the vacuum oil filter in the design process
In the vacuum oil filter transformer design, the amount of copper and iron can be balanced. Because once the capacity of the transformer is determined, the current is determined, and the thickness of the wire is also determined. Increasing the number of turns W, the magnetic flux Φ can be smaller, and the cross-sectional area of ​​the core can be smaller, but these should be When the number of turns is around, the window of the core should be larger; on the contrary, reducing the number of turns W, the magnetic flux Φ should be larger, and the sectional area of ​​the core should be larger, but the window of the core can be smaller.