To better link DVR detection algorithms and control strategies,avoid frequent DVR switching due to non-fault-caused voltage fluctuations,and increase DVR reliability and instantaneousness,a DVR switching criterion suitable for engineering applications is presented by dividing switching algorithm into 2 parts,namely,detection algorithm and switching criterion.

By properly non dimensionalizing the Rayleigh Plesset equation, the dynamic criterion of cavitation inception was established, which not only accounts for the dynamic effects of cavitation bubble, but also suits for any value of the polytropic coefficients.

This paper describes the configuration,operation criterion,trip logic and lock out logic of the overload protection for DC Filter Capacitor C1 in Gaozhao high voltage direct current transmission(HVDC) system based on the software and hardware structure of SIMADYN D device.

Based on the long experience with power system operation, some technical problems have been discussed in this paper, such as features of the fault recorder, starting criteria of the recorder and its setting, and automatic analysis of results by the recorder.