500kV有载和无载调压变压器并列运行问题的探讨

Discussion on Parallel Operation of 500kV On-load and No-load Tap Changing Transformers

2012年广州电网一座500 kV变电站由于其有载调压主变压器W相故障被迫退运,为保证对用户的安全可靠供电,拟采用现有一组无载调压主变压器替换故障变压器。根据变电站变压器技术参数,对余下正常的一台有载调压主变压器与拟采用的无载调压主变压器并列运行问题进行分析,给出了不同参数、型式的2台变压器并列运行的条件和最终推荐运行的匹配档位;对两种不同档位组合下2台变压器的负荷分配进行计算,结果表明2台变压器并列运行是可行的。

In2012,one 500 kV substation of Guangzhou power grid was forced to withdraw for reason of W phase failure of its on-load tap changing main transformer.In order to ensure safe and reliable power supply to customers,it was planning to use a set of no-load tap changing main transformers to replace faulted transformers.According to technical parameters of the transformer,this paper analyzes parallel operation of the rest of normal on-load tap changing main transformer and the no-load tap changing transformers proposed.In addition,conditions and matching tap positions finally recommended for parallel operation of the two transformers of different parameters and types were proposed.Load distribution of the two transformers with combination modes of two different tap positions was calculated and the result proves feasibility of parallel operation of these two transformers.