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用作三相短路電流計算的正序短路阻抗的簡略表示符號。
3.21 電氣設備的短路阻抗 short-circuit impedance of electrical equipment
3.21.1 電氣設備的正序短路阻抗 positive-sequence short-circuit impedance of electrical equipment
當由對稱的正序電壓系統(tǒng)供電時，線對中性點電壓同電氣設備相應相的短路電 流之比(見第8.3.2條)。
注：當負序阻抗和零序阻抗不可能同正序阻抗混淆時，表示正序阻抗的下標 可以省略。
3.21.2 電氣設備的負序短路阻抗 negative-sequence short-circuit impe- danceof electrical equipment
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