The Experts below are selected from a list of 70707 Experts worldwide ranked by ideXlab platform
Xue Yongduan - One of the best experts on this subject based on the ideXlab platform.
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fault location method based on zero sequence admittance measurement in non effectively Earthed System
IEEE PES Innovative Smart Grid Technologies Conference, 2012Co-Authors: Zhang Linli, Gao Houlei, Xu Bingyin, Xue YongduanAbstract:A new fault location method based on zero sequence admittance measurement is presented in order to solve the fault location problem of single phase-to-earth fault in non-solidly Earthed distribution network. The zero sequence admittance is calculated using measured zero sequence current and zero sequence voltage at sectionalized switch. The fault direction is determined by master station according to the angle of measured admittance, and then the faulty section is located by analyzing the fault direction results of different sectionalized switches. This method can be implemented in distribution automation (DA) System using the feeder terminal unit (FTU) as field measurement equipment, without requiring of additional equipment. The feasibility and accuracy of this proposed method is proved by the ATP simulation results.
Gao Houlei - One of the best experts on this subject based on the ideXlab platform.
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fault location method based on zero sequence admittance measurement in non effectively Earthed System
IEEE PES Innovative Smart Grid Technologies Conference, 2012Co-Authors: Zhang Linli, Gao Houlei, Xu Bingyin, Xue YongduanAbstract:A new fault location method based on zero sequence admittance measurement is presented in order to solve the fault location problem of single phase-to-earth fault in non-solidly Earthed distribution network. The zero sequence admittance is calculated using measured zero sequence current and zero sequence voltage at sectionalized switch. The fault direction is determined by master station according to the angle of measured admittance, and then the faulty section is located by analyzing the fault direction results of different sectionalized switches. This method can be implemented in distribution automation (DA) System using the feeder terminal unit (FTU) as field measurement equipment, without requiring of additional equipment. The feasibility and accuracy of this proposed method is proved by the ATP simulation results.
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an improved differential equation method for earth fault location in non effectively Earthed System
Developments in Power System Protection (DPSP 2010). Managing the Change 10th IET International Conference on, 2010Co-Authors: Gao Houlei, Bo Zhiqian, Andrew KiimekAbstract:An improved differential equation method for earth fault location in non-effectively Earthed System is proposed. Karrenbauer transformation is used to construct the compound mode network of single phase earth fault. Based on the mode network, the fault equation including mode voltage, mode current, line parameters and Earthed resistance is derived .The fault distance can be gotten by solving the equation with the least square estimation. In the calculation characteristics of different line models are compared and model is proved to be the best in accuracy and simplicity. ATP simulation and laboratory test proved that the proposed fault location method is feasible and has satisfactory accuracy. Because of using transient signal, the method is more sensitive and only need half cycle data, which can accelerate fault location speed and be more applicable. (6 pages)
Yuan Zhenhai - One of the best experts on this subject based on the ideXlab platform.
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application of traveling wave fault location for the small neutral Earthed System
Electrical Measurement & Instrumentation, 2008Co-Authors: Yuan ZhenhaiAbstract:Single phase-to-earth fault location for the small neutral Earthed System is still a difficult problem to be solved.Wave fault location measure is developing in fault location for grounded System.Wavelets transform theory perfected the traveling wave fault location for the fault location precision and accuracy of small neutral Earthed System.This paper preliminarily researches the theoretical fundamentals of traveling wave fault location for the small neutral Earthed System,and the application of this location measure for the identification of the first to the ball and the instance of the alternation of overhead lines and cables in the non-direct-grounded neutral System are induced and summarized.
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study on line selection of grounded fault in non effectively Earthed System based on wavelet neural network
Electrical Measurement & Instrumentation, 2007Co-Authors: Yuan ZhenhaiAbstract:It studied on the application of wavelet analysis theory and artificial neural network technology in line selection of single-phase grounded fault of non-effectively Earthed System.It introduced theories of singularity measure and modulous maxima,structure and improved arithmetic of neural network,and the line selection project based on wavelet neural network.,Fault characters were pick-up from zero sequence current in branch outlets as input vectors of neural network by wavelet transform.The three-layer model of BP network was established,which was trained by a great deal of samples collected from dynamic simulation model of non-effectively Earthed System and tested aiming at different fault modes.The results of simulation experiment prove that above method could select the fault line accurately and reliably.
Zhang Linli - One of the best experts on this subject based on the ideXlab platform.
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fault location method based on zero sequence admittance measurement in non effectively Earthed System
IEEE PES Innovative Smart Grid Technologies Conference, 2012Co-Authors: Zhang Linli, Gao Houlei, Xu Bingyin, Xue YongduanAbstract:A new fault location method based on zero sequence admittance measurement is presented in order to solve the fault location problem of single phase-to-earth fault in non-solidly Earthed distribution network. The zero sequence admittance is calculated using measured zero sequence current and zero sequence voltage at sectionalized switch. The fault direction is determined by master station according to the angle of measured admittance, and then the faulty section is located by analyzing the fault direction results of different sectionalized switches. This method can be implemented in distribution automation (DA) System using the feeder terminal unit (FTU) as field measurement equipment, without requiring of additional equipment. The feasibility and accuracy of this proposed method is proved by the ATP simulation results.
Shu Hongchun - One of the best experts on this subject based on the ideXlab platform.
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faulty line detection based on instantaneous zero sequence power for resonant Earthed System
Electric power automation equipment, 2013Co-Authors: Shu HongchunAbstract:A composite method of faulty line selection using instantaneous zero-sequence power is proposed for the single-phase-to-ground fault of resonant Earthed System,and its steady-state and transient characteristics are analyzed based on the instantaneous power theory.The fault signals after coordinate transformation are used to calculate the instantaneous zero-sequence power of faulty circuit,which is then decomposed to extract its oscillating components.Because the oscillating components of faulty line are different from those of healthy lines,the oscillating components with one,two,four and six times of elementary frequency are picked out and comprehensively analyzed to detect the faulty line.This method integrates the transient and steady-state characteristics of fault and includes the harmonic signals.With clear physical meaning,it adopts multiple complementary criteria and avoids the phase analysis.Its validity is verified by simulation and field test.
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a new approach to detecting fault line in resonant Earthed System using energy ratio in short window
International Conference on Sustainable Power Generation and Supply, 2009Co-Authors: Shu Hongchun, Peng Shixin, Li H Aibo, Zhao WenyuanAbstract:An adaptive fault line detecting method with correlation analysis using energy ratio is proposed based on the features of big capacitance current and high attenuation speed of hybrid transmission lines following single phase Earthed fault. Applying wavelet packet decomposition, characteristic waveband of each zero sequence current can be determined by the theory of maximum energy, which can exclude static-component and the other wave band and enhance margin of fault line detection. According to the attenuation speed characteristic wave band of fault line's transient capacitance current is highest, fault line can be detected by comparing relative energy of first 1/4 cycle and last 1/4 cycle during the first cycle after fault. The theoretic analysis and simulations show that, transient characteristic can be enlarged and effect of CT's intermittent angle can be avoided by using relative energy of first 1/4 cycle and last 1/4 cycle in the fist cycle after fault to realize fault line detection, the fault line detecting method is correct and reliable within the distribution network with hybrid transmission lines.
