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Influence of instrument transformers and anti-aliasing filters on the performance of fault locators

机译：互感器和抗混叠滤波器对故障定位仪性能的影响

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Anti-aliasing filters are used in cascade with instrument transformers (IT) as part of protective relay data acquisition systems for providing input signals to fault locators. Due to IT and anti-aliasing filters transient responses, the fault locators input data may not be replicas of the power network voltage and current waveforms, and incorrect information may be transferred to protection devices. In this paper, the performance of traveling wave-based and impedance-based fault location techniques are evaluated by extensive short-circuit simulations considering different IT topologies and anti-aliasing filters. The total amount of fault location estimated errors were combined to generate an error function and an original study about a thorough statistical analysis was performed. From the obtained results, the errors can be approximated by a function with normal probability distribution, and the fault location performances are directly affected by the fault-induced amplification and attenuation of the highest frequencies at the IT spectrum and the oscillations presented in the anti-aliasing filters bandpass.
机译：抗混叠滤波器与仪表变压器（IT）级联使用，作为继电保护数据采集系统的一部分，用于向故障定位器提供输入信号。由于IT和抗混叠滤波器的瞬态响应，故障定位器的输入数据可能不是电网电压和电流波形的复制品，并且错误的信息可能会传输到保护设备。在本文中，通过考虑不同IT拓扑和抗混叠滤波器的广泛短路仿真，评估了基于行波和基于阻抗的故障定位技术的性能。将故障位置估计的错误总数相结合以生成错误函数，并进行了有关彻底统计分析的原始研究。根据获得的结果，可以通过具有正态概率分布的函数来近似误差，并且故障定位性能直接受到故障引起的IT频谱最高频率的放大和衰减以及反电波中出现的振荡的影响。混叠滤波器带通。

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