新型换流变压器的差动保护及整定计算  

Differential protection and setting calculation of new-type converter transformer

作　　者：许加柱[1] 姜方财[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电工电能新技术》2013年第1期56-59,64,共5页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金项目(50907018)

摘　　要：针对新型换流变压器特殊的绕组接线型式,在建立其电流变换矩阵的基础上,提出了新型换流变压器的差动保护接线方案。采用三折线比率制动特性,综合考虑了变压器正常运行时的不平衡电流、电流互感器性能及内部匝间短路时流出电流等影响因素,对新型换流变压器的差动保护整定值进行了计算。最后,以实际新型换流变压器的数据为依据,建立了相应的差动保护方案仿真模型,通过对变压器多种运行状态进行仿真分析,验证了本文提出的保护方案的可行性和整定计算的正确性。Aiming at the special winding connection of the new-type converting transformer, the connecting scheme of differential protection is proposed based on the establishment of the current transform matrix. Adopting the ratio braking characteristic with three-broken lines, and taking these effects into account including the unbalance current under the normal condition, current-transformer performance and existing output current when occurring internal fault, the setting values for the differential protection of the new-type converting transformer are calculated. At last, the simulation model of the differential protection is established based on the new-type converting transformer tech- nical parameters. By means of the simulating analysis of various operating conditions of the transformer, the feasibility of the proposed scheme and the correctness of the setting calculation are verified.

关 键 词：新型换流变压器 差动保护 接线方案 比率制动 整定计算 

分 类 号：TM772[电气工程—电力系统及自动化]