例如,对于200MW的发电机的2%的定值为0.020x200MW=4MW。如果-次VT电压值为7.967kV,一次CT值为10 kA,则源标么值为239 MVA,因引功率定值为4 MW1239 MVA=0.0167pu(约等于0.017pu)。如果考虑反向功率的应用,灵敏角=180°,段灵敏最小功率=0.017pu。当正序电流的幅值变为雾时,该元件返回,也就是说,低于切除水平时返回。
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