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首页> 外文期刊>Science, Measurement & Technology, IET >Method to secure the performance of the differential protection in presence of fault current limiter applied into the neutral line
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Method to secure the performance of the differential protection in presence of fault current limiter applied into the neutral line

机译：在中性线存在故障限流器的情况下确保差动保护性能的方法

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摘要

Phase-to-ground fault is the most probable fault type in power systems, which is generally limited through neutral grounding resistor. The grounding resistor may have negative impacts on the system such as decrease in sensitivity of the differential protection. Fault current limiter (FCL) is a suitable alternative for the grounding resistor. However, the input signals of differential protections may be adversely affected by the FCL, resulting mal-operation of this protection. In this study, effects of FCL installed in neutral line of power transformers on the relevant differential protection algorithms are analysed. Performance of some well-known differential protection algorithms for discrimination between internal fault and magnetising inrush currents in presence of the neutral FCL is evaluated in detail. Then, a supplementary method based on the least error squares technique is proposed to rectify the deformed portion of the current waveform due to presence of the FCL. The reconstructed signal is considered as a proper input for the discrimination algorithms. Various simulations and experiments are carried out to validate the performance of the suggested technique. The results indicate the consistency of the suggested technique for different power systems, operating conditions, and real applications.
机译：相接地故障是电力系统中最可能发生的故障类型，通常通过中性点接地电阻器对其进行限制。接地电阻可能会对系统产生负面影响，例如降低差动保护的灵敏度。故障电流限制器（FCL）是接地电阻的合适替代品。但是，FCL可能会对差动保护的输入信号产生不利影响，从而导致该保护功能误动作。在本研究中，分析了安装在电力变压器中性线的FCL对相关差动保护算法的影响。详细评估了一些著名的差动保护算法在中性FCL存在下用于区分内部故障和励磁涌流的性能。然后，提出了一种基于最小误差平方技术的补充方法来校正由于FCL的存在而导致的电流波形的变形部分。重构的信号被视为判别算法的正确输入。进行了各种模拟和实验，以验证所建议技术的性能。结果表明所建议技术在不同电源系统，运行条件​​和实际应用中的一致性。

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