基于不同故障情况的特高压变压器差动保护仿真研究  

Simulation Research on UHV Transformer DIFP Based on Different Fault Conditions

作　　者：柳维衡[1] 郑涛[1] 

机构地区：[1]电力系统保护与动态安全监控教育部重点实验室(华北电力大学),华北电力大学,北京102206

出　　处：《现代电力》2010年第1期12-16,共5页Modern Electric Power

基　　金：国家自然科学基金项目(50607006)

摘　　要：介绍了当前中国在建的特高压变压器的结构和参数,并建立了相应的动态仿真模型。根据特高压变压器的结构和运行特性,提出了针对特高压容量大,分体式结构的差动保护配置。通过模拟不同故障情况下差动保护的反应,对各种差动保护的灵敏性进行分析比较。仿真结果表明单独对调压绕组和补偿绕组分别配置差动保护能提高其匝间故障的灵敏性,故障分量差动保护可以提高重负荷情况下变压器内部发生轻微故障的灵敏性,分侧差动保护则可以避免励磁涌流和过励磁的影响,零序差动保护可以提高单相接地故障保护的灵敏性,尤其是接地点离中性点很近的轻微接地故障。The actual configuration and parameters of UHV transmission under construction in China are introduced, and the corresponding dynamic simulation experiment model is established. According to the structure and operation characteristics of the 1 000kV UHV transformer, the differ- ential protection scheme is proposed based on the divided structure and large capacity of UHV transformer. Simulation results show that when voltage regulation winding and voltage compensation winding inter-turn faults happen, individual DIFP configuration of voltage regulation winding and voltage compensation winding can improve the sensitivity, the fault component DIFP can improve the sensitivity of the main winding＇s slight fault under the condition of heavy load, the split-side DIFP can avoid the influence of oVer-ex- citation and magnetizing inrush, and the zero-sequence DIFP can improve sensitivity when single-phase earth faults happen, especially for slight grounding fault whose grounding point is close to the neutral point.

关 键 词：特高压变压器 完全差动保护 故障分量差动保护 分侧差动保护 零序差动保护 

分 类 号：TM77[电气工程—电力系统及自动化]