Arent Fox LLP
Current differential protection method for self-adaptive half-wavelength line based on time-difference method
A current differential protection method for a self-adaptive half-wavelength line based on a time-difference method. Since an electrical distance of half-wavelength power transmission is long, after a fault occurs, there is an obvious time difference between the actuation times for protecting starting elements at two sides of a line. According to the principles of wave propagation, the position of a fault point can be determined by means of a difference between the actuation times for protecting the starting elements at the two sides of the line. By means of taking the fault point as a differential point, a current value at the differential point can be obtained according to a long line equation by means of the voltage and current at protection-mounted positions at the two sides of the line, and a differential current is then calculated.
CENTRAL CHINA BRANCH OF STATE GRID CORPORATION OF CHINA CHINA ELECTRIC POWER RESEARCH INSTITUTE COMPANY LIMITED STATE GRID CORPORATION OF CHINA
H H G
H02H H02H G01R
inventional inventional inventional
Dingxiang Huixin Yarong Jing Zhongqing Huanzhang Delin Zexin Xuming Xiao
Du Li Guo Li Li Liu Wang Zhou Liang Li