摘要
典型的微分欠压保护有电压变化率(du/dt)和低电压水平(udl)2个特征量。分析表明:du/d t对故障的响应受直流控制系统的影响很小,而udl对故障的响应是直流控制系统对故障进行调整的结果;du/dt对于发生在两极线路上的故障的响应明显大于对于其他区外故障的响应,udl对发生在本极和对极线路上的故障的响应有明显差异。分析了微分欠压保护的逻辑和功能,以及它和其他保护之间的配合关系。最后给出了微分欠压保护的整定方法,并借助EMTDC软件对整定方法进行了算例验证。
Typical differential under-voltage protection has two characteristic parameters：the variation rate of voltage（du/dt） and the low voltage level of HVDC transmission line（lull ）. Analysis shows：the response of du/dt to faults is slightly influenced by DC control system while that of J u^J is the adjustment result of DC control system against fauhs;du/dt responses to the faults of two polar lines more obviously than other out-zone faults,and J u^J responses to the faults of own and opposite polar lines quite differently. The logic and function of differential under-voltage protection are analyzed,as well as its coordination with other relay protections. The method for its setting is given and verified by a case study with EMTDC.
出处
《电力自动化设备》
EI
CSCD
北大核心
2014年第2期114-119,共6页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51077055)
高等学校博士学科点专项科研基金资助项目(20100172110031)~~
关键词
电力系统保护
微分欠压保护
高压直流输电
特征量
动态特性
electric power system protection
differential under-voltage protection
HVDC power transmission
characteristic parameter
dynamic characteristics
