广东1 500 MVA大容量变压器短路阻抗的研究

研究了1 500 MVA/500 kV大容量变压器容量增大后对短路阻抗的影响，研究结果表明变压器容量增大后，为了控制短路电流，变压器短路阻抗也需相应增加，而变压器无功损耗与短路阻抗成正比，因此其容性无功补偿容量也需增加，并引起变压器中、低压侧电压波动升高。结合珠江三角洲负荷中心电网短路电流较高的特点，以东莞500 kV水乡站（4×1 500 MVA）为依托，从短路电流、容性无功补偿方面对1 500 MVA/500 kV大容量变压器短路阻抗进行了研究，提出了广东电网1 500 MVA/500 kV大容量变压器短路阻抗参数规范推荐意见。

Short-circuit Impedance of 1 500 MVA Large Capacity Transformer in Guangdong

This paper studies the short impedance of 1 500 MVA/500 kV large capacity transformer.It shows that to reduce the short-circuit current of large capacity transformer,the short-circuit impedance should be increased with the capacity.Because the reactive power loss is proportional to the short-circuit impedance,the reactive power compensation should be increased correspondingly,and the voltage fluctuation on the middle voltage side and low side of transformer increases as well.According to the characteristic of the high short-circuit current of the Pearl River Delta power grid,this paper also studies the short-circuit impedance of 1 500 MVA/500 kV large capacity transformer on the short-circuit current and reactive power compensation of the 500 kV Shuixiang Substation.The parameters for 1 500 MVA/500 kV large capacity transformer in Guangdong power grid are recommended.