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A modified method based on the optimized charge simulation method (CSM) is used to predict the corona onset voltage and electric field when the space charges due to the corona are considered. Based on the streamer model of corona discharge, space charges generated near the conductors are predicted. In order to calculate the electric field at the conductor surface, space charges are replaced by some...
An improved method based on the charge simulation method is used to predict the corona onset voltage and electric field after space charges are calculated based on the streamer model. Because of the existence of space charges the corona onset electric field is changed a little, which will have a little effect on the analysis of corona phenomena. The corona onset electric field is given especially...
Direct current transformer is the key device in measuring high current value of HVDC power system. Its accuracy and reliability is an important basis guaranteeing the control and protection system of HVDC grid work normal. A mal-operation event of protection relay of plusmn500 kV HVDC system of China Southern Power Grid Co., Ltd. is described. Measurement performance of optic-electric DC current transformer...
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