例如，對于200MW的發(fā)電機(jī)的2%的定值為0.020x200MW=4MW。如果-次VT電壓值為7.967kV，一次CT值為10 kA,則源標(biāo)么值為239 MVA,因引功率定值為4 MW1239 MVA=0.0167pu(約等于0.017pu)。如果考慮反向功率的應(yīng)用，靈敏角=180°，段靈敏最小功率=0.017pu。當(dāng)正序電流的幅值變?yōu)殪F時，該元件返回,也就是說，低于切除水平時返回。

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