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对三峡机组可能选择的三种灭磁方案(线性电阻灭磁,氧化锌非线性电阻灭磁,碳化硅非线性电阻灭磁)进行了探讨,仿真比较了三者在大电流和小电流下的灭磁情况,并重点研究了两种非线性电阻灭磁方案在三峡水轮机组上的灭磁情况。结果表明,三峡机组若采用线性电阻灭磁,至少需要15 s以上的灭磁时间,这无法起到保护机组的作用;而采用非线性电阻灭磁,灭磁时间大约是2～3 s,因此非线性电阻适用于三峡机组的灭磁保护。根据研究结果,在三峡电站首期发电机组中,建议采用碳化硅非线性电阻灭磁系统。
Three kinds of de-excitation schemes (linear resistance demagnetization, zinc oxide non-linear resistance demagnetization and silicon carbide nonlinear de-excitation demagnetization) that may be selected by the Three Gorges Project are discussed. The simulation results show that the three demagnetization schemes at high current and low current The situation of demagnetization, and the de-excitation of two kinds of nonlinear resistance demagnetization programs on the Three Gorges turbine unit are mainly studied. The results show that if the Three Gorges unit adopts linear resistance de-excitation, it needs at least 15 seconds for demagnetization time, which can not play the role of protecting the unit. However, using non-linear resistance de-excitation, the demagnetization time is about 2 ~ 3 s Non-linear resistance for the Three Gorges unit demagnetization protection. According to the research results, it is suggested to adopt silicon carbide non-linear resistance demagnetizing system in the first generation of Three Gorges power station.