大型火力发电厂高厂变和高压起备变用电流互感器性能和配置方案

针对当前大型火力发电厂300 MW、600 MW、1 000 MW级机组高压厂用电接线和高压起动/备用变压器接线种类繁多,测量、保护用电流互感器数量及参数每个工程各异,是否采用TPY级的电流互感器有不同看法的情况,按照《电流互感器和电压互感器选择和应用导则》及国内大型火力发电厂配置的高压厂用变压器和高压起动/备用变压器的典型参数,通过计算分析,提出了大型火力发电厂高压厂用变压器和高压起动/备用变压器在各种接线方式下的电流互感器的配置方案,给出了合理的结论,以规范大型火力发电厂在该方面的设计思路。

CT configurations for auxiliary transformer and stand-by transformer of heavy-duty power plant

The current situation is that:the wiring schemes of auxiliary transformer and stand-by transformer for 300 MW,600 MW and 1 000 MW units of heavy-duty power plants are various,the quantities and parameters of CTs used in different projects are not same,and the application of TPY CT is not mandatory.According to The guide for selection and calculation of current transformers and voltage transformers and the typical parameters of auxiliary transformer and stand-by transformer in domestic heavy-duty power plants,a CT configuration of auxiliary transformer and stand-by transformer for heavy-duty power plants with different wiring schemes is put forward to unify its design,which is based on the calculative analysis and rational conclusion.