中文摘要：

针对我国新建的1 000 kV特高压（UHV）电网采用的单相四柱式的特高压变压器,从工程防灾的角度,提出采用K值法计算单相四柱式特高压变压器主体变的GIC-Q扰动（GIC-K）,采用磁–电路耦合方法建立了单相四柱式特高压主体变的模型,通过迭代计算得到了变压器发生GIC直流偏磁时的励磁电流特性以及变压器的无功损耗特性,并依据GIC-K值法对无功损耗特性进行了拟合,得到了基于GIC-K值法的单相四柱式特高压主体变的GIC-Q损耗的工程算法和计算结果。结果表明,单相四柱式特高压主体变的GIC无功损耗与GIC成近似线性关系,比例系数K值为2.44;计算得到的1 000 kV单相变压器的GIC-Q损耗可达到500 kV单相变压器GIC-Q损耗的2.07倍。

英文摘要：

In accordance with single-phase four-limb ultra-high voltage（UHV） transformers which are adopted in the newly constructed 1 000 kV UHV power grid, we proposed a method with K parameter for calculating the GIC-Q from the engineering disasters prevention perspective（GIC-K）. The magnetic circuit and electric circuit coupled model of sin- gle-phase four-limb UHV main transformers was set up. Based on the coupled model, exciting currents and GIC-Q were obtained by iterative calculation. In addition, the curve of GIC-Q was fitted according to the method of GIC-K. Then the engineering method with K parameter and its results were obtained for calculating the GIC-Q of single-phase four-limb UHV main transformers. The results show that the relation between GIC and GIC-Q of single-phase four-limb UHV main transformers is approximately linear, and the proportional coefficient is 2.44. Furthermore, it has been calculated that GIC-Q of 1 000 kV single-phase transformer can reach 2.07 times as much as the GIC-Q of 500 kV single-phase trans- former.