A new method to eliminate periodical narrow frequency noises in partial discharge detection of electric powersystem apparatus, Fourier series method, is presented. It uses the difference not only on frequency domain ...
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A new method to eliminate periodical narrow frequency noises in partial discharge detection of electric powersystem apparatus, Fourier series method, is presented. It uses the difference not only on frequency domain but also mainly on time duration between signals and noises. The anti-interference effect of this method was analyzed by experiments data on field. Several factors that can make influence to the affect of this method, such as the error of frequencies of the noise, the data length by which the Fourier coefficients are calculated, the error of A/D conversion, were discussed respectively. It was found that this method can almost completely banish narrow frequency noises, at the same time can retain the amplitude and polarity of partial discharge pulses, even if the main frequency of the partial discharge pulses are close to that of narrow frequency noises. The affect of this method was also contrasted with normal method, such as digital filter, adaptive filter and wavelet. The result shown that this new method has obvious predominance at remaining the amplitude and polarity of pulse signals.
A novel method is put forward, which the power meter can be read based on compute vision, and the architecture of remote meter auto reading system is designed. Different with the normal automatic meter reading system ...
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A novel method is put forward, which the power meter can be read based on compute vision, and the architecture of remote meter auto reading system is designed. Different with the normal automatic meter reading system that must obtain the value from digital communication interface, the new method recognizes the meter reading utilizing the computer vision technique, it is a kind of non-contact measurement. In the meter automatic reading, the computer vision discrimination, incorporate human's ability of visual and apprehensive models. Not only the digital display power meter can be read, but also the direct-reading instrument can be fetched. In this paper, the scheme of remote automatic reading is introduced, the local meter reading information of distributed substation can be transmitted to center using computer network and then the pretreatment, segmentation and pattern matching, are detailed description in the meter image recognition process. Via energy meter automatic recognition experiment, the results based computer vision is accurate enough to monitor the remote substation running parameters
Electromagnetic interference (EMI) on secondary dc cable in cable tunnel due to a direct lightning strike in substation threatens the safe operation of electronic equipment and system connected to the cable. In order ...
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An improved subcell model is presented for including thin material sheets method in the finite-difference time-domain (FDTD) method. This improved subcell can be used to simulate a thin magnetic (μs ≠ μo) sheet. Th...
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An improved subcell model is presented for including thin sheets in the finite-difference time-domain (FDTD) method. This improved subcell model can simulate thin multilayer material sheets and was verified by compari...
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TheAsiaInformationRetrievalSymposium(AIRS)wasestablishedbytheAsian information retrieval community after the successful series of Information - trieval with Asian Languages (IRAL) workshops held in six di?erent locati...
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ISBN:
(数字)9783540318712
ISBN:
(纸本)9783540250654
TheAsiaInformationRetrievalSymposium(AIRS)wasestablishedbytheAsian information retrieval community after the successful series of Information - trieval with Asian Languages (IRAL) workshops held in six di?erent locations in Asia, starting from 1996. While the IRAL workshops had their focus on inf- mation retrieval problems involving Asian languages, AIRS covers a wider scope of applications, systems, technologies and theory aspects of information retrieval in text, audio, image, video and multimedia data. This extension of the scope re?ects and fosters increasing research activities in information retrieval in this region and the growing need for collaborations across subdisciplines. We are very pleased to report that we saw a sharp increase in the number of submissions and their quality, compared to the IRAL workshops. We received 106papersfromninecountriesinAsiaandNorthAmerica,fromwhich28papers (26%) were presented in oral sessions and 38 papers in poster sessions (36%). It was a great challenge for the Program Committee to select the best among the excellent papers. The low acceptance rates witness the success of this year’s conference. After a long discussion between the AIRS 2004 Steering Committee and Springer, the publisher agreed to publish our proceedings in the Lecture Notes in Computer Science (LNCS) series, which is SCI-indexed. We feel that this strongly attests to the excellent quality of the papers.
To improve the computation accuracy of the transient radiation fields in gas insulated substation (GIS), surface-patch model is proposed in this paper, and the method of vector fitting combining with recursive convolu...
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In order to research the transient current and voltage along the busbar in substations, the ground return impedance of aerial multiconductor transmission lines above a multilayer soil is researched and its time-domain...
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