1000kV特高压变压器继电保护配置复杂,分析1000 kV特高压主变压器差动保护配置,介绍电流互感器(TA)极性选择和配置原则,给出纵联差动保护和分相差动保护差流计算方法;并分析特高压调压补偿变压器采用"分相"差动保护方案的原因,论证调压补偿变压器"分侧"差动保护作为补充保护应用的可行性;最后提出特高压主变压器在整定计算和运行维护工作中的注意事项.工程运行证明:该特高压主变压器差动保护配置方法满足工程要求.%The protection configuration of 1 000 kV EHV transformer is complex, the differential protection configuration for 1 000 kV UHV transformer was analyzed in this paper. Firstly, the polarity selection and configuration principle of TA was introduced, and the differential calculation method of longitudinal differential protection and split phase protection were analyzed. Secondly, the reason of using split phase differential protection in UHV regulation and compensation transformer was analyzed, and the feasibility was verified that the winding differential protection can be used as additional protection for regulation and compensation transformer. Finally, combined with UHV substation characteristics, some suggestions were put forward in setting calculation, operation and maintenance of UHV transformer. The field operation experiences showed that the differential protection configuration of UHV main transformer could meet the project requirements.
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