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當由對稱的負序電壓系統(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)。
3.21.3 電氣設備的零序短路阻抗 zero-sequence short-circuitof electrical equipment
當用三條并聯(lián)的導線作為電流進線，第四根導線或大地作為回線，設備由交 流電壓供電時，線對地電壓與電氣設備相連的一個相的短路電流之比(見第8.3.2 條)。
3.22 同步電機的超瞬態(tài)電抗X〃d ubtransient reactance X〃d of a synchronous machine
短路瞬間的有效電抗。計算短路電流時，用的飽和值。
3.23 斷路器的最小延時tmin minimum time delay tmin of a circuit breaker
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