采样值差动保护安全性及灵敏度的研究  

Research on security and sensitivity of sampled-value differential protection

作　　者：杨恒坤[1] 邓祥力[2,3] 王传启[2,3] 崔建铁[3] 尹项根[2] 

机构地区：[1]东方电子集团有限公司,山东烟台264000 [2]华中科技大学电力安全与高效湖北省重点实验室,湖北武汉430074 [3]东方电子股份有限公司,山东烟台264000

出　　处：《电力系统保护与控制》2011年第16期107-113,共7页Power System Protection and Control

摘　　要：对采用模值和制动方式的采样值差动保护的安全性及灵敏度进行研究。从相量值差动保护区内故障的最严酷条件出发,对采样值差动保护的差流门槛值和比率制动系数的灵敏度进行了分析,得出采样值差动保护在区外故障时可靠不动、区内故障时可靠动作,输入信号量在半个工频周期内满足动作判据的角度范围是90°～121°。建立了变压器匝间故障的简化仿真模型,针对变压器空投、轻微故障和区外故障工况,对采样值差动保护进行了仿真分析,验证了上述结论。所确定的S值,既能保证变压器空载合闸时保护的安全性,也能保证空投于变压器内部匝间故障时,保护有较高的灵敏度。This paper studies the security and sensitivity of sampled-value differential protection algorithm （SDPA） for detecting transformer internal fault with mode restraint current. Under the most rigorous fault conditions for phase value differential relay, it analyzes and compares the security and sensitivity of detecting transformer internal fault for both traditional phase value differential protection algorithm （TDPA） and SDPA, and selects the reasonable R and S values for SDPA in the end. The angle of input signal meeting the action criteria in half power frequency cycle ranges from 90° to 121° . It is proved by a simplified simulation that the values have fine sensitivity and security for such operation condition of transformer as energizing, turn-to-turn faults, and out-zone faults. The S value determined can not only ensure safety but also ensure protective turn-to-turn fault sensitivity in the course of transformer energization.

关 键 词：采样值差动保护 相量值差动保护 比率制动特性 励磁涌流 安全性 灵敏度 

分 类 号：TM77[电气工程—电力系统及自动化]