Research on Small Current Neutral Grounding System Based on Wavelet Packets and Comparation of Energy
There is no good solution on the current grounding system-on-phase fault line selection, and the misjudgment and emissive judgment of the fault lines is more prevalent. In this paper, the stable and transient features of single phase-to-ground fault in un-effectual grounded system are deeply researched and analyzed in theory, and combine with the theory wavelet packet, a new way is putted forward for detection of the fault line based on wavelet packets and the compare of energy. First parallel a medium resistance instantly with the arc suppression when the fault is happening to increase the transient characteristic, and then obtain all the energy of every line by integral operation to preparatory detect the possible line, in the end, on this base, decompose all the transient zero sequence currents in every line by separation based on nicer separate frequency characteristic of wavelet packets, detect the polarity and size of differential coefficient for every zero sequence current,when the line whichs polarity is contrary to others and its size is maximum, then it can be detected truly that it is the fault line. It is testified by a great deal of examinations with simulation that this method can identify the fault information, and can surely and unfailingly select the fault line.
Wavelet packet Zero sequence current Energy function Selection of fault line
Zili Xu
Foshan Power Supply Bureau,Guangdong Power Grid,Shunde,Guangdong Province,China Electric Power College,South China University of Technology,Guangzhou,Guangdong Province,China
国际会议
2008 China International Conference on Electricity Distribution (CICED 2008)(2008中国国际供电会议)
广州
英文
1-5
2008-12-10（万方平台首次上网日期，不代表论文的发表时间）