机车电传动 (Jan 2022)
Research on lightning impulse simulation method and protection technology of a traction power supply system
Abstract
The traction power supply system will have high amplitude transient overvoltage after lightning stroke, which will affect the stable operation of railway transportation system. In order to effectively evaluate the transient characteristics of traction power supply system under lightning impulse, a T-type transient model of catenary tower and a lightning propagation simulation method of traction power supply system was proposed. Based on a 110/27.5 kV traction substation, the transient simulation model of its low-voltage side branch under lightning impulse was established, and the transient characteristics of main electrical equipment were analyzed. The results show that the peak value of lightning overvoltage on the low voltage side of traction transformer decreases linearly with the increase of lightning counterattack distance; the current decreases with the increase of distance, but the decreasing range slows down and shows a saturation trend. Through the comparison of different configuration schemes of lightning arrester in traction substation, it was concluded that the installation of lightning arrester on the low-voltage output side of traction transformer is the best scheme.
