Abstract Through a macroscopic inspection, stereomicroscopic material analysis, hardness metallographic scanning electron microscope and energy spectrum the reasons for breakage of connecting bolts circuit breaker in 500kV converter station are studied. The results show that bolt fracture is caused by combined effect hydrogen embrittlement high-stress low-cycle fatigue. corresponding recommende...

High-voltage circuit breakers are among the most important equipments for ensuring the efficient and safe operation of an electric power system. On occasion, circuit breaker operators may wish to check whether equipment is performing satisfactorily and whether controlled switching systems are producing reliable and repeatable stress control. Monitoring of voltage and current waveforms during sw...

In this paper, a new design of circuit breaker is proposed which operates based on the energy Electronic switching gadgets. A simple constructed and tested with overload conditions. Based contemporary go flow threshold, mosfet becomes ON OFF. The triggers relay sends journey signal to breaker. reset time may be numerous microcontroller. response in comparison conventional for distinct hundreds....

Recently the hybrid multi-port DC circuit breaker (MP-DCCB) is becoming popular in protecting HVDC grids, thanks to their reduction of power electronics devices. In this paper, an enhanced current-limiting DCCB (MP-CLCB) for multiple line protection proposed. The integrated fault current limiter (FCL) inside MP-CLCB can clear faster with slightly increased costs. To reduce energy dissipation re...