±800kV特高压直流换流站500kV站用变压器保护配置

Protection Configuration of 500 kV Station Transformer in± 800 kV UHVDC Converter Station

为提高直流换流站500 kV高压站用变压器保护配置的可靠性,以糯扎渡—广东±800 kV特高压直流输电工程江门换流站500 kV高压站用变压器参数及接线形式为模型,进行典型故障短路分析计算,提出接于500 kV 3/2交流配电装置串内的高压站用变压器保护采用变压器差动+高压侧引线差动保护配置方案。并提出了一种500 kV换流站站用变压器高压侧辅助失灵保护的配置判据,较好地解决了以往500 kV换流站站用变压器高压侧失灵保护可能存在拒动或误动的问题。该研究成果已应用于江门换流站,可为换流站高压站用变压器保护配置提供参考。

In order to improve the reliability of protection configuration for 500 kV station transformer in HVDC converter station, the typical short circuit was analyzed and calculated, in which the parameters and connecting pattern of 500 kV HV station transformer in Jiangmen converter station of Nuozbadu-Guangdong _＋ 800 kV UHVDC transmission project was taken as the model. The protection configuration scheme of 500 kV HV station transformer connected 500 kV AC distribution device with 3/2 wiring was proposed, which included the differential protection of transformer and lead at high- pressure side. The configuration criterion of failure protection at high-pressure side of 500 kV station transformer was suggested, which could provide a better solution for the misstrip and maloperation problems of failure protection existed in the converter stations built before. The research results have been applied in the Jiangmen converter station, which will provide references for the protection configuration of HV station transformer in converter station.