变压器并列运行问题分析

Analysis of Transformer Parallel Operation Problem

对变压器并列运行的可行性进行研究。分析了变压器部分并列运行时短路穿越电流的影响,及完全并列运行时环流及容量分配问题。以某扩建变电站为例,对两台参数不一致的变压器并列运行的可行性进行了定量计算,得出这两台变压器在实际变比尽量一致的前提下可采取高、中、低压三侧均并列运行的方式。容量差别较大的变压器不建议采用部分并列的运行方式,并列运行的变压器最好采用相同的变比。分析结果及建议为变压器安全运行提供了依据。

The feasibility of transformer parallel operation is analyzed. The influence of the crossing current of short circuit during the partial transformer parallel operation and the circulating current and the capacity distribution problems during the total parallel operation are analyzed. An extended substation is taken as an example, and the feasibility of parallel operation of two transformers with different parameters is calculated quantitatively. It is concluded that the parallel operation mode should be adopted at all high, medium and low voltage sides under the precondition of trying to keep the actual ratios of two transformers the same as possible. The partial parallel operation mode is not suggested to be adopted among transformers with large capacity difference, and the same ratio is best used among transformers of parallel operation. Analysis results and suggestions provide reference for the security operation of transformer.