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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >Fault Detection During Asymmetrical Power Swing Using Superimposed Negative Sequence Current
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Fault Detection During Asymmetrical Power Swing Using Superimposed Negative Sequence Current

机译：利用叠加的负序电流进行不对称功率摆的故障检测

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摘要

Power swing phenomenon occurred during single-pole auto-reclosing (SPAR) period is called asymmetrical power swing. During symmetrical power swing, power swing blocking is used to block distance relay to avoid the selectivity property. Therefore, fault detection is more challenging during asymmetrical power swing since open-pole condition introduces large amount of negative and zero sequence components in voltage and current signals. Further, fault detection during power swing and SPAR prevailed in a series compensated line is more challenging as the metal oxide varistor protecting series capacitor imposes other frequency components. In this paper, a new superimposed negative sequence (NS) current-based technique is proposed to detect the fault incepted in a series compensated line during asymmetrical power swing. The superimposed NS current is calculated using phasor difference between the fault and prefault NS currents. The proposed technique exploits the presence of substantial amount of superimposed NS current during asymmetrical power swing period to detect fault accurately. A summation index is used to declare the fault when it crosses the threshold value. Transient data, obtained from two systems simulated using PSCAD/EMTDC software, are used to test the performance of approach.
机译：在单极自动重合闸（SPAR）期间发生的功率摆幅现象称为非对称功率摆幅。在对称功率摆幅期间，功率摆幅阻塞用于阻塞距离继电器以避免选择性特性。因此，由于开极条件在电压和电流信号中引入了大量的负序和零序分量，因此在非对称功率摆幅期间的故障检测更具挑战性。此外，由于金属氧化物压敏电阻保护串联电容器会施加其他频率分量，因此在功率补偿期间的故障检测和串联补偿线路中占主导地位的SPAR更具挑战性。本文提出了一种新的基于负序电流（NS）的新技术，以检测不对称功率摆幅期间串联补偿线路中的故障。使用故障和故障前NS电流之间的相量差来计算叠加的NS电流。所提出的技术利用在不对称的功率摆幅期间存在大量的叠加NS电流来准确地检测故障。当故障超过阈值时，总和索引用于声明故障。从使用PSCAD / EMTDC软件模拟的两个系统获得的瞬态数据用于测试进近性能。

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