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In this paper, a self-powered lightning current sensor based on the electromagnetic induction principle has been proposed. The sensor whose signal coil and power harvesting coil are nested in lightning channel (such as grounding wire of lightning arresters) can be triggered and powered by the lighting current. The signal acquisition is realized by the signal coil, and the polarity and peak value of...
This essay presents an efficient intelligent over-voltage hierarchical recognition system for 110kV substation based on LSSVM optimized by gridding optimal algorithm. It is very indispensable to analyze and find the causes of over-voltage for ameliorating insulation coordination in power system. According to analyzing field over-voltage data from over-voltage on-line monitoring devices installed in...
Laser-induced fluorescence (LIF) is an active technology that is closely related to excitation wavelength (EW). This study has mainly analyzed the performance of LIF LiDAR with different EWs in distinguishing plant species. The 355-, 460-, and 556-nm lasers were utilized to excite leaf fluorescence. The fluorescence signals were measured by the LIF system built in the laboratory. Subsequently, principal...
Smart grid is a very important concept that optimizes and improves the reliability of power transmission systems. The smart grid is required to be more aware of its operative conditions and should have at least some degree of self healing capability. This paper discusses the condition monitoring technologies of HV equipment in smart grid. The development status of condition monitoring technologies...
Moisture content in transformer oil is an important index for equipment condition. Based on technical requirement of on-line monitoring of moisture content, this paper presents a water solubility estimation method using least square technique. Water distribution and solubility in oil is analyzed, and the Karl-Fischer method is adopted to determine moisture content in one oil sample; then, temperature...
This paper presents an application platform for heterogeneous wireless sensor networks (WSNs) and a management architecture to this network. The purpose of this platform is to provide both academia and industry a large-scale experimental environment to test and to verify their newly developed WSN systems in the future. In a first step two types of application scenario have been depicted. The next...
The aim of this paper is to defining the application architecture of monitor system for transportation process from the viewpoint of the third party logistic service provider. Recently with the advent of the information technology and the wide spread use of the Internet, new user oriented production and logistic systems, such as the logistic management system, have been required in order to cope with...
This paper presents a de-noising method for partial discharge (PD) online monitoring of transformers. The method is based on an improved wavelet de-noising approach and a pulse-sequence analysis method. Dual couplers are used for detecting the PD pulse current flowing through the high voltage bushing of each phase and the grounding wire connected with the measurement terminal of the high voltage bushing...
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