大型变压器涌磁过程的谐波及其在电网中的放大

HARMONICS IN EXCITATION INRUSH PROCESS OF LARGE POWER TRANSFORMER AND ITS MAGNIFICATION IN NETWORK

超高压大容量变压器空载合闸的励磁涌流在电网中缓慢衰减，其谐波分量的分布和传播将受网络参数的影响，本文以华中５００ｋＶ电网谐波试验研究为基础，分析了涌流谐波及其沿输电线路传播的放大现象。

While large UHV transformer isswitched on under no load condition the excitation inrush current will be slowly attenuated,the distribu-tion and propagation of the harmonic components areaffected by parameters of the system.Based on the re-search of harmonic test in Central China 500 kV PowerSystem,in this paper the data of frequency spectrumof inrush current are given and its magnification phe-nomena are analyzed when the inrush currents is trav-eling along the power transmission lines.