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In order to suppress random pulse interference in field detection of partial discharge in power equipments, pulse features is extracted using equivalent time-frequency analysis. Based on adaptive fuzzy clustering of the features, concentration degree of phases is used as the indicator to distinguish partial discharge signal from pulse interference. The results of field data analysis indicate that...
Research on electromagnetic wave frequency-field transmission characteristics of partial discharge in GIS is important for the examination of partial discharge within GIS. Finite element software was employed to conduct the simulation study on frequency-field transmission of the electromagnetic wave in GIS, and the experiment for electromagnetic wave transmission characteristics was developed in the...
To determine the relationship between partial discharge type and envelope signal of partial discharge is important to evaluate the insulation state of gas-insulated switchgear (GIS). In this paper, discretization and differential matrix reduction is first conducted over the feature matrix composed of feature vectors characterizing UHF PD envelope signals using rough set theory for dimensionality reduction...
A portal acoustic-electrical system for partial discharge localization of GIS is developed, which can be used for multi-channel acoustic-electrical detection of ultrahigh-frequency, ultrahigh-current and ultrasonic signals generated by partial discharge of GIS. The system program, developed based on LabVIEW, is able to continuously capture, sample and store pulse waveforms of partial discharge signals...
Partial discharge monitoring and location system at substation receives radio frequency (RF) signals emitted by partial discharge to position partial discharge using a set of omni-directional RF antenna array. As it is possible for the entire substation to have several partial discharge sources simultaneously, the basic requirement of partial discharge detection at the substation is to judge whether...
It is possible to carry out PD location using the time difference of PD pulses received by a UHF antenna array. In practical applications, the electromagnetic interference within the substation will pollute these received signals and make it difficult to calculate the time difference of the PD pulses, which, thus, reduces the reliability of the PD source locating. Based on the segmented processing...
Phase angle of PD pulse is an important parameter of PD pattern, and its accuracy determines the effectiveness of PD pattern recognition based on phase-resolved distribution analysis. In this paper, a novel phase angle calculation method for UHF PD detecting systems in segment acquisition mode is proposed. This method use a synchronous circuit to output UHF marker signals with certain frequency characteristics...
Ultra-High-Frequency (UHF) method is an effective approach to PD detection. Currently the UHF couplers applied for partial discharge monitoring are classified into three types according to their installation places: internal couplers, external couplers and dielectric window couplers. Sensitivity analysis of these three sensing modes is carried out based on Finite Element Method simulation by using...
The Dynamic Line Rating (DLR) system can increase transmission capacity of overhead line dynamically. The system is composed of sampling terminals installed on dead-end configuration of a line and one control instrument equipped in dispatch center. The data between the sampling terminals and the control instrument is transmitted through GPRS/GSM. Then three major limitations governing the line rating...
The secondary voltage control scheme based on multi-agent theory is presented in the paper. In this scheme, the individual primary voltage controllers and the secondary controller are represented as a set of execution agents and a coordination agent, respectively, who work either independently or coordinately to control the system-wide voltage level. According to the principles of the multi-agent...
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