【摘要】：為進一步提高電力變壓器保護的性能,提出一種基于勵磁電感參數(shù)識別的變壓器快速主保護方案。通過分析T型等效電路中勵磁電感在變壓器正常運行、鐵芯飽和以及內(nèi)部故障時的特點,構(gòu)建了基于勵磁電感數(shù)值大小和波動性的變壓器保護判據(jù)。研究表明:時域參數(shù)識別方法計算得到的勵磁電感,在正常運行和外部故障時其數(shù)值較大;在內(nèi)部故障時,由于故障電流為差動電流的一部分,勵磁電感的計算數(shù)值較小;在鐵芯飽和時數(shù)值在較大值和較小值之間波動。由于保護判據(jù)中考慮了鐵芯飽和對勵磁電感數(shù)值的影響,因此該保護方案能夠快速靈敏地識別變壓器故障,且不受勵磁涌流的影響,具有良好的性能。動模試驗驗證了該保護方案的有效性,試驗結(jié)果表明,該方案能夠可靠地識別變變壓器內(nèi)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.
【作者單位】： 西安交通大學(xué)電氣工程學(xué)院;陜西省電力設(shè)計院;
【基金】：國家自然科學(xué)基金項目(50907048,51037005) 高等學(xué)校博士學(xué)科點專項科研基金項目(20090201120018)~~
【分類號】：TM41

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