Grounding short-circuit fault is a common fault for AC and DC transmission lines. The shunting of the short-circuit current in the ground wires and the frequency components of the short-circuit current are very important for analyzing the influences of the short-circuit current on the pipelines and other facilities near the transmission lines. Consequently, on the basis of the first ±500 kV HVDC transmission project in Yunnan Province, we artificially and experimentally investigated the grounding short-circuit on AC and DC transmission lines. The shunting of the short-circuit current was measured in the substation outlet or the middle of the transmission line depending on the position and the type of the fault.Moreover, the features of the current shunting and frequency components of the fault current were analyzed. The main conclusions are drawn as follows: AC short-circuit current decays with oscillation, and the frequency components consisting of 50 Hz is dominant, being accompanied with DC component with frequencies higher than 50 Hz. DC short-circuit current is a simple waveform without oscillation, which increases initially and then decreases. The main frequency component is below 30 Hz, which is related to the DC system blocking time. The frequency components also include a small amount of 50 Hz, 160 Hz, 340 Hz, and 1 800 Hz. According to all the tests, no matter short-circuit current takes place in the substation outlet or the middle of the transmission line, more than 60% of the short-circuit current flows away from the ground wires, which is consistent with the simulation result.
KEY WORDS :substation;converter station;transmission line;artificial grounding fault;ground wire;current shunting;frequency distribution;
图7
富武甲线中点短路时短路电流
Fig.7
Current of the short-circuit fault at the middle of the Fu-Wu A transmission line
图8
富武甲线中点短路时地线电流
Fig.8
Currents in ground wires of the short-circuit fault at the middle of the Fu-Wu A transmission line
图9
富武甲线中点短路时短路电流幅频特性
Fig.9
Amplitude-frequency characteristics of the current of the short-circuit fault at the middle of the Fu-Wu A transmission line
图10
富武甲线中点短路时地线电流幅频特性
Fig.10
Amplitude-frequency characteristics of the currents in ground wires of the short-circuit fault at the middle of the Fu-Wu A transmission line
表6
富武甲线中点短路测试结果
Table
6 Test results of the short-circuit fault at the middle of the Fu-Wu A transmission line
图15
永富直流极Ⅰ石林段短路电流
Fig.15
Current of the short-circuit fault at the middle of the Yong-Fu DC transmission line
图16
永富直流极Ⅰ石林段短路电流幅频特性
Fig.16
Amplitude-frequency characteristics of the current of the short-circuit fault at the middle of the Yong-Fu DC transmission line
表8
地线分流比例仿真与实测结果
Table
8 Test and simulation results of division factor of ground wires
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