基于励磁电感参数识别的快速变压器保护
发布时间：2019-06-10 05:23
【摘要】：为进一步提高电力变压器保护的性能,提出一种基于励磁电感参数识别的变压器快速主保护方案。通过分析T型等效电路中励磁电感在变压器正常运行、铁芯饱和以及内部故障时的特点,构建了基于励磁电感数值大小和波动性的变压器保护判据。研究表明:时域参数识别方法计算得到的励磁电感,在正常运行和外部故障时其数值较大;在内部故障时,由于故障电流为差动电流的一部分,励磁电感的计算数值较小;在铁芯饱和时数值在较大值和较小值之间波动。由于保护判据中考虑了铁芯饱和对励磁电感数值的影响,因此该保护方案能够快速灵敏地识别变压器故障,且不受励磁涌流的影响,具有良好的性能。动模试验验证了该保护方案的有效性,试验结果表明,该方案能够可靠地识别变变压器内部故障。
[Abstract]:In order to further improve the performance of power transformer protection, a fast main protection scheme for transformer based on excitation inductance parameter identification is proposed. Based on the analysis of the characteristics of excitation inductor in T-type equivalent circuit when transformer is normal operation, core saturation and internal fault, a transformer protection criterion based on the numerical value and fluctuation of excitation inductance is constructed. The results show that the excitation inductor calculated by the time domain parameter identification method is large in normal operation and external fault, and the calculated value of excitation inductance is small in the case of internal fault because the fault current is a part of differential current. The saturation hours of the iron core fluctuate between the larger value and the smaller value. Because the influence of core saturation on the value of excitation inductance is considered in the protection criterion, the protection scheme can identify transformer fault quickly and sensitively, and is not affected by inrush current, and has good performance. The effectiveness of the protection scheme is verified by dynamic model test. The test results show that the scheme can reliably identify the internal faults of transformer.
【作者单位】： 西安交通大学电气工程学院;陕西省电力设计院;
【基金】：国家自然科学基金项目(50907048,51037005) 高等学校博士学科点专项科研基金项目(20090201120018)~~
【分类号】：TM41
[Abstract]:In order to further improve the performance of power transformer protection, a fast main protection scheme for transformer based on excitation inductance parameter identification is proposed. Based on the analysis of the characteristics of excitation inductor in T-type equivalent circuit when transformer is normal operation, core saturation and internal fault, a transformer protection criterion based on the numerical value and fluctuation of excitation inductance is constructed. The results show that the excitation inductor calculated by the time domain parameter identification method is large in normal operation and external fault, and the calculated value of excitation inductance is small in the case of internal fault because the fault current is a part of differential current. The saturation hours of the iron core fluctuate between the larger value and the smaller value. Because the influence of core saturation on the value of excitation inductance is considered in the protection criterion, the protection scheme can identify transformer fault quickly and sensitively, and is not affected by inrush current, and has good performance. The effectiveness of the protection scheme is verified by dynamic model test. The test results show that the scheme can reliably identify the internal faults of transformer.
【作者单位】： 西安交通大学电气工程学院;陕西省电力设计院;
【基金】：国家自然科学基金项目(50907048,51037005) 高等学校博士学科点专项科研基金项目(20090201120018)~~
【分类号】：TM41
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