Partial discharge of an insulator or surge arrester is a symptom of an insulation breakdown or insulation failure. It is very important to know the position of discharge source as soon as possible in order to remove this cause. In order to achieve remote monitoring of the faults due to an insulator and surge arrester on the distribution systems, the most important things need to do is to determ...

With increasing scale of usage for renewable energy resource, DC micro-grids system becomes more and more popular for the application of different kinds of power electronics in DC. However DC arc fault introduces major safety concerns due to the randomness and instability, especially absence of zero current crossing, which makes it is hard to be detected and eliminated. In this thesis, a novel ...

rivers are unstable environments affected by natural or human factors in changing their directions and patterns. in this study, the tectonic effects on the pattern of the gharasou river in the north of kermanshah city have been studied. aerial photos (years 1955 & 1990), satellite images (etm, year 2000) and topographic as well as geologic maps were used as research tools. the procedure of the ...

Arc fault diagnosis is necessary for the safety and efficiency of PV stations. This study proposed an arc algorithm formed by combining variational mode decomposition (VMD), improved multi-scale fuzzy entropy (IMFE), support vector machine (SVM). method first uses VMD to decompose current into intrinsic functions (IMFs) in time-frequency domain, then calculates IMFE according IMFs associated wi...

The paper presents an apparent impedance calculation procedure for distance relaying of transmission line involving FACTS devices, particularly the UPFC (unified power flow controller). The presence of UPFC significantly affects the trip boundaries which are also adversely affected by fault resistance combined with remote end infeed. Depending on the UPFC location, the trip boundary is influenc...

Abstract In the resonant grounding system, accurate judgment of arc-extinction time has guiding significance for line selection fault, evaluation arc suppression effect, and extraction utilization transient information after extinction. Aiming at single-phase fault this paper analyzes frequence change characteristics before It is found that zero-sequence electrical quantity extinction power fre...

[1] The Gibraltar Arc in the western Mediterranean consists of the Betic and Rif Alpine chains and the Alboran Sea Basin. Four types of stress indicators (wellbore breakouts, earthquake focal plane mechanisms, young geologic fault slip data, and hydraulic fracture orientations) indicate a regional NW–SE compressive stress field resulting from Africa-Eurasia plate convergence. In some particular...