空载变压器音频特性研究

Study on Audio Frequency Character of Open-Circuit Transformer

研究了配电网中常用的降压变压器（６ｋＶ／３８０Ｖ）在音频激励信号频率下原端的阻抗特性，结论是：在音频激励信号范围内，变压器副边开路时，空载阻抗为容性；副边短路时，空载阻抗为感性；当频率确定时，随着变压器容量的增加，变压器空载阻抗下降；同一容量的变压器，随着频率的下降，空载容抗增加；副边接补偿电容时，空载阻抗为感性。

This paper studies the input-port impedance character of step-down transformer (6kV/380V) which often used in distribution network. The results are:whithin the audio frequency,when the secondary coil is opened,the input impedance has the characterize of capactor,and while the secondary ciol is shorted, the input impedance has the characterize of inductance. When frequency is fixed, with the increase of transformer'capacity,the input impedance will decrease. Transformer with the same capacity,with the de- crease of frequency, the input capacitor impedance increases. When the secondary coil is connected with compensate capacitor,the input impedance has the characterize of inductance.