摘要
以糯扎渡电站送电广东±800 kV直流输电工程普洱换流站星角换流变压器为例,论述了其差动保护的计算整定及灵敏度校验。通过在Matlab中建立12脉动换流器的直流输电模型,对换流变压器差动区内阀侧上两相金属性短路进行仿真,同时辅以南方电网在许继集团进行的换流变压器保护装置(RTDS)试验中数据和波形为佐证。综合分析后得出:在直流输电系统中,由于星角换流变压器差动保护采用套管TA,其灵敏度校验应按系统最小运行方式下星角换流变压器差动保护区内换流变压器阀侧上三相金属性短路计算而不是常规的两相金属性短路计算。
By taking the wye/delta converter transformer in Pu＇er converter station in Nuozhadu-Guangdong ＋800 kV DC Transmission Project as an example,the calculating settings and sensitivity checking of differential protection are discussed.A 12-pulse inverter DC transmission model is established by MATLAB for simulation of the AB phase-to-phase fault on the valve side of wye/delta converter transformer,and the testing data and waveforms from the XUJI GROUP＇s converter transformer protective device-RTDS in CSG＇s project are used for proof.A comprehensive analysis indicate that,for HVDC systems,since tube A is used in the differential protection of the wye/delta converter transformer,the sensitivity should be calculated according to the three-phase short-circuit on the valve side of wye/delta converter transformer under the system＇s minimum operating mode rather than the conventional phase-to-phase short-circuit.
出处
《中国电力》
CSCD
北大核心
2014年第9期118-121,共4页
Electric Power
