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Evaluating maximum permissible feeder current in capacitive compensated harmonic polluted networks introducing Apparent RMS Current Ratio Index (ACRI)
Electric Power Systems Research ( IF 3.9 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.epsr.2020.106511
Mazdak Ebadi , Mohammad Bayat , Hossain Asadi

Abstract Overcurrent (OC) protective relays use different methods to calculate the RMS value of the current signal, based on the CT data. One common technique uses the peak-to-peak value, which is called the Apparent RMS Value in this paper. But using this value, when there are noticeable harmonics in feeders current, may lead to OC relay malfunction. The ratio of maximum possible Apparent RMS value to True RMS value is introduced as the Apparent RMS Current Ratio Index (ACRI). Then maximum permissible current in a feeder is determined so that no relay malfunction is guaranteed. This malfunction occurs more often in capacitor banks feeders in MV/LV substations with big nonlinear loads such as big induction furnaces, especially in resonance situation. Results are investigated on a typical 63 kV/20 kV substation including a big nonlinear load compensated by four back-to-back capacitor banks.

中文翻译:

评估电容补偿谐波污染网络中的最大允许馈线电流,引入视在 RMS 电流比指数 (ACRI)

摘要 过电流 (OC) 保护继电器根据 CT 数据使用不同的方法来计算电流信号的 RMS 值。一种常用技术是使用峰峰值,在本文中称为视在 RMS 值。但使用此值,当馈线电流中存在明显的谐波时,可能会导致 OC 继电器故障。最大可能的视在 RMS 值与真实 RMS 值的比率被引入为视在 RMS 电流比指数 (ACRI)。然后确定馈线中的最大允许电流,从而保证不会出现继电器故障。这种故障更常发生在具有大非线性负载的中压/低压变电站的电容器组馈线中,例如大型感应炉,尤其是在谐振情况下。
更新日期:2020-10-01
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