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To guarantee the uniform distribution of transient recovery voltage for double-break circuit breaker, grading capacitors are often installed in parallel with each interrupter unit. In this study, the influence of the capacitors on the secondary arc is systematically investigated. First, the equivalent circuit for ultra high voltage transmission line is developed. Taking the capacitor into account,...
Both geomagnetically induced currents (GIC) and high voltage direct current (HVDC) projects using the earth as its path can cause direct current flowing in the ground. Direct current flux will be produced and has detrimental effects on power systems. Few references can be found about the effects of dc bias on the current transformer that is very important to both metering and protective aims. In this...
The presence of interharmonics may cause some negative effects on the power systems, such as malfunction of the remote control, CT transformation and relay systems. Based on a CT model established according to its operation principle and governing equations, a series of simulations are done through EMTP. From the results of simulations, two variables, the content and frequency of the interharmonic,...
There exist serious coupling effects between the ultra high voltage(UHV) double-circuit transmission lines. In spite of elucidating detailedly both the static and the electromagnetic coupling mechanisms, the impacts of the line transposition mode on the induced voltages and currents are analyzed via established equivalent circuit model. As a case study which incorporates UHV double-circuit lines to...
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