摘要
常规的三次谐波式定子接地保护一般采用|U3T+KPU3N|>β|U3N|作为动作条件,正常运行时动作量与发电机工况有关,限制了灵敏度。文中采用微机自适应原理实时自动跟踪U3T及U3N的变化,将发电机各种工况下动作量降至最低,既提高了灵敏度又节省了现场调整工作量。
The conventional stator ground relay often uses |U· 3 T +K· P U· 3 N |>β|U· 3 N | as the criterion. The criterion relates to the output power of generator, and so the sensitivity is limited. By utilizing the adaptive protection principle, the action can be reduced to minimum under normal conditions. It not only improved the sensitivity but also reduced the adjustment work in the field. The field test shows that the new protection scheme has high sensitivity.
出处
《电力系统自动化》
EI
CSCD
北大核心
1997年第3期36-38,共3页
Automation of Electric Power Systems