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发明公开
CN109143070A 用于确定发电机出口端短路故障电流直流时间常数的系统 有权

用于确定发电机出口端短路故障电流直流时间常数的系统
摘要：
本发明实施方式提供一种用于确定发电机出口端短路故障电流直流时间常数的系统，属于火电站发电机出口端短路故障技术领域。该系统包括：处理器，用于采集发电机的短路电流波形数据；处理器，被配置成：对采集的短路电流波形数据进行归一化处理，以得到处理后的电流数据；确定电流数据在预定时间区间内的极值点对应的时刻，以计算短路合闸角对电流数据在时间域上进行积分以得到积分后的波形数据；计算第一时刻T1和第二时刻T2；计算第一时间常数Ta1和第二时间常数Ta2；计算直流时间常数的相对偏差x；判断相对偏差x是否小于或等于偏差阈值δ；在判断相对偏差x小于或等于偏差阈值δ的情况下，时间常数计算结果为直流时间常数。
摘要（英）：

The invention provides a system for determining a DC time constant of the short circuit fault current at an outlet end of a generator and belongs to the technical field of a thermal power station generator outlet end short circuit fault. The system includes a processor used for acquiring short-circuit current waveform data of a generator, and the processor is configured to normalize the collectedshort-circuit current waveform data to obtain processed current data; the time corresponding to an extreme point of the current data within a predetermined time interval is determined to calculate a short-circuit closing angle phi; the current data is integrated in the time domain to obtain integrated waveform data; the first time T1 and the second time T2 are calculated; a first time constant Ta1and a second time constant Ta2 are calculated; the relative deviation x of the DC time constant is calculated; whether the relative deviation x is smaller than or equal to the deviation threshold delta is determined; if yes, the time constant calculation result is the DC time constant.

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