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Porcelain insulation-defining the underlying mechanism of failure

High Voltage 2019年第2期4卷 81-88页

作者： joni kluss Mojtaba Rostaghi Chalaki Wilburn Whittington Hongjoo Rhee Samuel Whittington Aref Yadollahi Electrical and Computer Engineering Mississippi State UniversityMississippi StateMSUSA Mechanical Engineering Mississippi State UniversityMississippi StateMSUSA Center for Advanced Vehicular Systems Mississippi State UniversityStarkvilleMSUSA

Porcelain insulators have a long history and wide application range in power systems,but just like any other insulator,they can fail.A number of pole fires occurred on lines utilising porcelain suspension *** some cases,the insulators appeared to be visually intact with no external signs of degradation or abnormal *** prompted a comprehensive assessment to identify the mechanism that leads to the permanent loss of insulating properties while retaining external physical characteristics.A single test is not sufficient to determine the underlying cause of conduction as results may produce contradictory *** tests were able to identify samples with poor dielectric ***,these same samples exhibited excellent mechanical *** successfully passing numerous porosity tests,scanning electron microscopic analysis revealed porosity and multiple microscopic punctures in the porcelain *** upon complete dissection of samples,the conduction mechanism was *** article discusses the challenges associated with establishing the root failure mechanism for the investigated porcelain insulators that allows visually sound samples to lose their insulating properties without experiencing catastrophic failure.

关键词： mechanism porosity conduction

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Review of Fault Types, Impacts, and Management Solutions in Smart Grid Systems

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Smart Grid and Renewable Energy 2019年第4期10卷 98-117页

作者： Mohammed Mousa Sherif Abdelwahed joni kluss Electrical and Computer Engineering Department Mississippi State University Starkville MS USA Electrical and Computer Engineering Department Virginia Commonwealth University Richmond VA USA

Fault management study in smart grid systems (SGSs) is important to ensure the stability of the system. Also, it is important to know the major types of power failures for the effective operation of the SGS. This paper reviews diverse types of faults that might appear in the SGS and gives a survey about the impact of renewable energy resources (RERs) on the behavior of the system. Moreover, this paper offers different fault detection and localization techniques that can be used for SGSs. Furthermore, a potential fault management case study is proposed in this paper. The SGS model in this paper is investigated using both of the Matlab/Simulink and the Real Time Digital Simulation (RTDS) to compute the fault management study. Simulation results show the fast response to a power failure in the system which improves the stability of the SGS.

关键词： Detecting Fault Fault Management Impact of Renewable Energy Resources Isolating Faulty Load Locating Fault Matlab/Simulink RTDS Smart Grid System Types of Faults

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