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Calculations of generator source short- circuit current according to ANSI/IEEE and IEC standards, with EMTP verifications

机译:根据ANSI / IEEE和IEC标准计算发电机电源短路电流,并通过EMTP验证

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For the interruption of a large generator source-short-circuit current, a current zero may not be obtained at the contact parting time of the circuit breaker. Large generators which have high X/R ratio, and depending upon the relative impedances and time constants the DC component can be higher than the AC decaying component delaying the occurrence of current zero well beyond contact parting time of the circuit breaker. The subject is well addressed in the current literature, though not the calculations of it. This paper presents calculations of a large practical generator using ANSI/IEEE and IEC standards with verifications of results using EMTP. It demonstrates large differences which impact the selection of generator circuit breaker interrupting duties.
机译:为了中断较大的发电机电源短路电流,在断路器的触点断开时可能无法获得零电流。大型发电机具有较高的X / R比,并且取决于相对阻抗和时间常数,DC分量可能高于AC衰减分量,从而使电流零的出现大大延迟了断路器的触点断开时间。在当前文献中,尽管不是计算方法,但该主题已得到很好的解决。本文介绍了使用ANSI / IEEE和IEC标准的大型实际发电机的计算,并使用EMTP验证了结果。它显示出很大的差异,这些差异会影响发电机断路器中断职责的选择。

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