Spacing distance of shielding wires for ±800 kV ultra-high voltage DC yard

作者：He Jin Liang^*; Dong Lin; Zeng Rong; Liu Ze Hong; Yu Jun; Gao Li Ying

来源：High Voltage Engineering, 2010, 36(1): 19-25.

• Converter station
• Direct lightning strikes
• Electrical equipment
• Fractal method
• Fractal methods
• Fractal model
• Lightning channel
• Lightning currents
• Lightning withstand level
• Lower probabilities
• Protection measures
• Protection systems
• Recommended values
• Shield wire
• Ultra high voltage
• Wire spacing

The equipment in ultra-high voltage (UHV) DC yard have a low lightning withstand level to direct striking lightning, much stricter protection measures than those for AC substations should be adopted when designing the protection system of UHV DC yard against direct lightning strike. We analyzed the protection range of the lighting rod on the basis of the fractal model of the lightning channel. Due to the lower probability of lightnings with lightning current directly striking the DC yard, densely packed shielding wires were suggested to be used to protect electrical equipment in the UHV DC yard. According to the lightning withstand level of different devices in the DC yard, the polyline method, rolling-sphere method, leader progression model, and fractal model were applied to analyze the spacing distances in different regions of UHV DC yard. The results from different methods are compared, and the recommended values of shielding wire spacing distances in different regions of UHV DC yard are suggested, which have been applied in the shield wire designs of Xiangjiaba-Shanghai and Jinping-Sunan ±800 kV UHVDC yards.

• 出版日期2010
• 单位清华大学