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.
出处
《电工电能新技术》
CSCD
北大核心
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)
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
new-type converter transformer
differential protection
connecting scheme
ratio braking
setting cal culation