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Novel Wavelet Approach to Transformer Differential Protection

Author: FengXiaoLing
Tutor: TanJianCheng
School: Guangxi University
Course: Proceedings of the
Keywords: Internal fault External fault Inrush current RTDS Wavelet Transform
CLC: TM77
Type: Master's thesis
Year: 2005
Downloads: 221
Quote: 7
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Abstract


Second harmonic restraint principle and the principle is to distinguish between intermittent angle transformer inrush and internal short-circuit current two most commonly used methods , but with the transformer capacity is growing, increasingly long transmission lines caused by the distributed capacitance and current transformer saturation so that the internal fault current also contains a large second harmonic , and sometimes even more than the inrush current ; modern art transformer manufacturing processes and materials contained in the second harmonic inrush current reduction . This leads to the second harmonic restraint relay judge delay or even malfunction. The intermittent hardware protection angle method is costly and subject to CT saturation, in the practical application of computer protection is limited. So people made ??a lot of new transformer protection programs. This paper introduces the fuzzy logic , expert systems , artificial neural network , wavelet transformer protection various advantages and disadvantages of the new algorithm , focusing on the wavelet transform transformer protection applications in various methods to compare a variety of protection principle found wavelet transform in transformer protection applications on a wider range of prospects . Articles in the wavelet transform is proposed based on a new transformer protection algorithms. RTDS using real-time digital simulation system for modeling the system , as well as various types of failures simulated transformer magnetizing inrush current closing time , and CT saturation under simulated fault currents and airdrop transformer failure occurs . RTDS via wavelet transform on both sides of the transformer output signal data is decomposed to extract new features get fault jump, jump and use the failure to distinguish between magnetizing inrush product symbols and internal and external failures, get new algorithms. Algorithm simulation results show that the method is not the impact of CT saturation and worst failures , the algorithm is simple and fast with high reliability and robustness.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system protection
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