实际变压器适用理想化变压器模型的条件

本文从一般的电感耦合电路出发,讨论了实际变压器电压、电流变比在不同条件下随负载阻抗的变化关系,提出了将实际变压器看作理想变压器所需要满足的条件：一个实际变压器,如果满足①紧耦合,即耦合系数 ;②损耗电阻及漏抗远小于负载阻抗;③线圈感抗远大于负载阻抗,它就可以被视为理想变压器。如果只满足①和②,可以实现理想的电压变比;如果只满足①和③,可以实现理想的电流变比。

Idealization Conditions of An Actual Transformer

An engineering expression of the ideal transformer conditions is put forward, that an actual transformer can be considered ideal on conditions that (1) it is tightly coupled, or the coupling coefficient is much close to 1; (2) its loss resistance and leakage reactance is far smaller to the load impedance; and (3) its coils impedance are far greater to the load impedance. If only (1) and (2) are satisfied, the ideal voltage transform ratio can be realized, and if only (1) and (3) are satisfied, the ideal current transform ratio can be realized.