摘要
要实现新型换流变压器的产业化,制定与新型换流变压器配套的保护方案是重要的前提之一。文中对新型换流变压器的差动保护原理进行了研究。在分析新型换流变压器绕组特殊接线方案和三绕组之间特定匝数比关系的基础上,得出了相应的新型换流变压器两侧电流的变换关系,并据此提出2种差动保护接线方案。针对新型换流变压器正常运行和内外部故障等各种状况,分析和比较了新型换流变压器2种差动保护接线方案的动作特性,从而得出了按一次侧相电流之差构成的差动保护接线方案优于按一次侧相电流构成的差动保护接线方案的结论。文中的研究成果为实际工程中新型换流变压器差动保护接线提供了理论依据。
In order to realize the industrialization of the new converter transformer, one of the important preconditions is to make matched protection scheme for the new converter transformer. The principle of differential protection for the new converter transformer is studied. Based on the analysis on the special windings wiring mode and turns ration relation of the new converter transformer, the relationship between bilateral currents of the new converter transformer are obtained, and two differential protection wiring schemes are thus proposed. The differential protection principle for the new converter transformers is tested under all operation conditions so as to compare the protection action characteristics. The results show that the differential protection scheme composed by subtraction of each two phase currents is better than the differential protection scheme based on the phase currents of primary side. The results can provide theoretical guide to the differential protection wiring scheme for the new converter transformer for actual engineering applications. This work is supported by National Natural Science Foundation of China （No. 50907018） and Special Fund for the Key Eleventh Five-year Science-technology Research Program of Hunan Province （No. 06GK1003-1）.
出处
《电力系统自动化》
EI
CSCD
北大核心
2011年第4期46-50,共5页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50907018)
湖南省"十一五"重大科技专项(06GK1003-1)~~
关键词
直流输电
新型换流变压器
差动保护
动作特性
接线方案
direct current transmission
new converter transformer
differential protection
action characteristic
wiring scheme
