特高压调压变压器直流偏磁特性计算

DC Bias Characteristics Computation of UHV Regulation Transformer

分析了特高压调压变压器的工作原理,获得直流偏磁下调压变压器的等效电路,建立了调压变压器的有限元磁场模型。基于时域场路耦合模型,计算分析了当调压抽头位于第一分接头时不同直流偏磁影响下特高压调压变压器的电流特性,也对比分析了调压变压器各绕组电流的谐波的变化规律。计算结果可为调压变压器的保护提供参考。

In this paper the working principle of the UHV （ultra high voltage） regulation transformer is analyzed, the equivalent circuit under DC basis is obtained, and the FEM （finite element） magnetic field model of regulation transformer is established. Based on the time-domain field-circuit coupled model, the current characteristics of the UHV regulation transformer under different DC bias are analyzed with the tap changer located at the first tap, the variation law of the harmonics of each winding current is also analyzed. The calculation results can provide reference for the protection of regulation transformer.