State Grid Corporation of China

China Electric Power Research Institute Company Limited

Central China Branch of State Grid Corporation of China

Huixin Li

Jing Li

Xiao Dong Li

Zhongqing Li

Zexin Zhou

Dingxiang Du

Huanzhang Liu

Yarong Guo

Delin Wang

Xuming Liang

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.

Current differential protection method for self-adaptive half-wavelength line based on time-difference method

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Wuhan, China

Huixin Li