應用衝擊響應頻譜分析法於變壓器湧流與故障電流即時辨識之研發

The Real Time Identification of Inrush Current and Fault Current for Transformer Applying Shock Response Spectrum Analysis

楊宸昌(Chen-Chang Yang)

指導教授 ： 鄭健隆

國立虎尾科技大學/電機資訊學院/電機工程研究所/碩士(2010年)

摘要

本論文針對差動保護裝置為變壓器主要保護設備之一，差動保護裝置已經相當成熟，保護裝置目前最關鍵和最困難的問題是在於如何防止激磁湧流所導致差動保護裝置的誤動作，對此提出有效激磁湧流辨識對策。如何可靠的區分暫態激磁湧流與故障電流，能進行即時正確的判斷，達到有效辨識為目的。因此，本文研究變壓器在無載投入過程中所產生波形進行偵測，採取衝擊響應頻譜(Shock Response Spectrum，SRS)方法能夠有效分析非週期信號辨識暫態湧流與故障電流，使用Matlab軟體模擬運算SRS並且分析激磁湧流訊號，提取激磁湧流特性加以處理，特別是針對基本波和二次諧波特性為主，診斷變壓器狀態為何，可以發現SRS分析方法能夠可靠地辨識激磁湧流與故障電流。實際應用到數位信號控制器(Digital Signal Controller，DSC)為核心，設計偵測電路，以實現即時辨識之效果。

關鍵字

變壓器 ； 湧流 ； 諧波 ； 衝擊響應頻譜

並列摘要

In this paper, the differential protection devices for the transformer is one of the basic principles of long maturity, the protection device of the most critical and most difficult problem is how to prevent the magnetizing inrush current caused by differential protection device malfunction, which offered exciting inrush current discrimination measures. How to correctly distinguish the transient magnetizing inrush and fault current can be timely and accurate identification, in order to effectively achieve the purpose of identification. Therefore, this study in no-load transformer input waveform generated by the process of detection, using the shock response spectrum analysis method can effectively identify non-periodic signal transient excitation inrush and fault current. The Matlab software simulation mean calculus SRS, analysis of inrush current signals, extract and address the inrush current characteristics especially for the fundamental wave and the second harmonic of the main features, and diagnostic transformer state. SRS analysis can be found to reliably identify the inrush current and fault current. The digital signal controller is used to design detection circuit, and reach an real-time judge of the effects of inrush current.

並列關鍵字

Transformers ； Inrush Current ； Harmonic ； Shock Response Spectrum

參考文獻

[1] C. L. Cheng, Y. H. LAn, K. L. Chen and C. W. Peng, “Real Time Monitoring of Suppressing Inrush Current for Three-phase Transformer”, Proceedings of the Symposium on Electrical Power Enginerring, pp.E7.6-1~E7.6-6, 2007.

[2] C. L. Cheng, J. C. Yeh, S. C. Chern and Y. H. Lan, “Analysis of Transformer Inrush Current under Harmonic Source”, IEEE PEDS 2007, pp.544-549, Nov. 27-30, 2007.

[3] C. L. Cheng, K. L. Chen, C. W. Peng and Y. H. Lan, “The Suppressing and Shock Response Spectrum Analysis of Inrush Current for Three-Phase Transformer”, Proceedings of Taiwan Power Electronics Conference, pp.559-562, 2007.

[4] C. L. Cheng, S. C. Chern, Q. S. Chen, F. Y. Lin and C. S. Liu, “Shock Response Spectrum Analysis of Transformer Inrush Current and Fault Current”, Proceedings of the Symposium on Electrical Power Engineering, pp.PB1.16.1~PB1.16.5, 2006.

[5] C. L. Cheng, C. E. Lin, C. L. Huang, J. C. Yeh, “A Simple Model for Transformer Inrush Current Calculation and Harmonic Analysis”, Electric Power System Research. Vol. 24, No. 2, pp. 153-163, 1992.