Title :
Tests on the first 500 kV compact transmission line in China
Author :
Gong, Xuehai ; Wang, Huiren ; Zhang, Zhangkui ; Wang, Jinping ; Wang, Jian ; Yuan, Yichao
Author_Institution :
North China Res. Inst. of Electro-Optics, Beijing, China
Abstract :
The paper deals with the tests on the first 500 kV compact transmission line in China. The transmission line is located in north China power network. It is from Fangshan substation to Changping substation near Beijing. The transmission distance of the line is 83 km. In order to investigate the characteristics of the transmission line, many tests were performed on the line before and after its operation. The electrical parameters including the positive sequence and zero sequence impedance were measured before operation. The results are the same as the designed ones. The electrical field near the transmission line when it is energized is not higher than the conventional transmission line. As compared with the conventional transmission line, the insulation distance of the compact transmission line is considerably short; the switching surges of phase to earth and phase to phase were investigated carefully during switching operation. Different operation modes of the breaker are considered. The phase to earth overvoltage is less than 1.79 p.u. The phase to phase overvoltage is not greater than 3.45 p.u. The voltage and current unbalance between the phases of the transmission line is very small when it is energized. The audible noise and radio interference is not higher than the designed one
Keywords :
acoustic noise; electric field measurement; overvoltage; power overhead lines; radiofrequency interference; surges; switching; 500 kV; 83 km; Beijing; Changping substation; China; Fangshan substation; audible noise; circuit breaker operation modes; compact transmission line; current unbalance; electric field measurement; electrical field; electrical parameters; insulation distance; north China power network; phase to earth overvoltage; phase to earth switching; phase to phase overvoltage; phase to phase switching; positive sequence impedance; radio interference; switching surges; transmission distance; voltage unbalance; zero sequence impedance; Earth; Electric variables measurement; Impedance measurement; Performance evaluation; Power transmission lines; Substations; Testing; Transmission line measurements; Transmission lines; Voltage control;
Conference_Titel :
Power System Technology, 2000. Proceedings. PowerCon 2000. International Conference on
Conference_Location :
Perth, WA
Print_ISBN :
0-7803-6338-8
DOI :
10.1109/ICPST.2000.900051
