Protection is the most significant area of power system indeed. For single phase LT consumers, electromechanical B – Type MCB is available nowadays. Many significant workouts on various breakers have been found with excellent features like VCB, SF6 and so on. In the present paper a brief discussion is made on protection against over current scenario due to low fault impedance. The purpose of th...

During the last years the medium voltage world has seen a strong increase in demand of flexibility, simplicity and automation of the distribution networks. The Smart Grids concepts have changed network’s needs and solutions with innovative design are required to satisfy these new demands. The standard IEC61850 is driving the innovation in the energy distribution devices enabling new functionali...

A two-dimensional compressible magnetohydrodynamic (MHD) computational model has been developed to study the effect of gassing material on air arc behavior in low voltage circuit breaker. The properties of arc plasma and the electric, magnetic and radiative phenomena have been taken into account in the model. Based on the model, steady state solutions have been performed to study the effect of ...

Voltage Source Converter-High Voltage Direct Current (VSC-HVDC) is the most efficient and reliable method for electrical power transmission over long distances. The greatest challenge with VSC-HVDC system is that short-circuit faults damages the converter valves and the transmission network. The fault clearing time for the available DC breakers are not fast enough and reliable to provide adequa...

The restrike of vacuum circuit breaker during the breaking process causes overvoltage and intensifies insulation deterioration high-voltage equipment. To solve this problem, aging test method characteristics are researched. A withstand voltage platform 40.5-kV was established to obtain effects contact spacing loop inrush currents on number restrike, wavefront steepness breakdown voltage, durati...