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With the wide use of Extra High Voltage Gas Insulated Substation (GIS), Very Fast Transient Over-voltage (VFTO) generated by switching operations threatens the insulation of some equipments even the security of the whole power system. The transformer is the main casualty of VFTO. For a 800kV GIS, the model has been built up and the parameters have been selected in this paper. VFTO magnitudes as well...
This study proposes an islanding detection method for use of grid-connected inverter of distributed renewable generation system. The proposed method is based on two indices: the rate of change of voltage (ROCOV) and the rate of change of frequency (ROCOF). When an inverter is grid-connected, the ROCOV and ROCOF are lower than the threshold values. In contrast, as an islanding occurs, the ROCOV or...
The neutral point in medium voltage distribution system is mainly non-effectively earthed in China. The important characteristics of this system are the fault-phase voltage decreasing and the un-fault-phase voltage increasing when SLG (Single-Line-to-Ground) fault happened. Due to the existing of line capacitance, the transient progress of un-fault-phase voltage increasing can be regard as a charge...
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