摘要
基于序阻抗原理的变压器保护方案利用变压器发生区内外故障时,变压器两侧正负序阻抗所在象限的不同,来有效识别变压器区内外故障,文中在此方案基础上,改进了象平面区域的划分,补充了励磁涌流识别判据,并讨论了在特殊情况下所应采取的措施。在构建电流互感器饱和模型的基础上,利用HYBRISIM进行了大量的仿真实验,仿真结果表明:基于改进型序阻抗原理的保护方案,较原方案在保护动作的可靠性和灵敏性等方面均有较大的改善和提高,与传统的比率制动型差动保护相配合,可构成一种较理想的变压器主保护方案。
The sequence impedance-based algorithm of transformer protection has the advantage of immunity to current transformer saturation and ratio-mismatch conditions. It has excellent performance in distinguishing the transformer's internal and external fault currents by identifying the location of positive and negative sequence impedance of each side of transformer in the phase plane. Based on this principle, this paper improves the partition of phase plane, complements criteria of identifying inrush currents and discusses measurements which should be considered under special conditions. After constructing the saturation model of the current transformer, simulation tests of HYBRISIM (hybrid simulator) are made. Simulation results show that this new algorithm can improve the reliability and sensitivity of transformer protection. Cooperating with ratio-restraint differential protection, an ideal protective scheme can be outlined.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第14期67-71,共5页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50277012)
关键词
变压器保护
差动保护
序阻抗
内部故障
外部故障
电流互感器饱和
transformer protection
differential protection
sequence impedance
internal fault
external fault
current transformer saturation
